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Young-Chul PARK, Yoichi KANEMITSU, Shinya KIJIMOTO, Koichi MATSUDA, Yo ...
Article type: Article
Session ID: 4901
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In order to perform acoustic analysis with sufficient accuracy, the method of treating sound absorption characteristics is important. Modeling theories using flow resistance or complex density/complex sound velocity are generally used in the modeling methods of porous materials. However, since it is difficult to find out necessary material characteristic for prediction of the sound absorption characteristic, acoustic characteristics of sound absorption material may be unable to be predicted. In this research, an easy modeling method of sound absorption material is proposed for analyzing the 3-dimensional acoustic field that has a sound absorption material. Therefore, an experiment was conducted on the sound tube that has a sound absorption material. The validity of a simple modeling method of sound absorption material will be verified by comparison of the experimental result and the calculated result.
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Keitarou KUWABATA, Kunisato SETO
Article type: Article
Session ID: 4902
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Atsushi KADOWAKI, Masataka KOSAKA, Kunisato SETO
Article type: Article
Session ID: 4903
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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An Optical Wave Microphone System (O.W.M.S) is a new sound measuring device which need not install a device directly at measuring point like a condenser microphone and need not mix particulate materials like Leaser Doppler Velocimetry. Therefore O.W.M.S can measure sound without disturbing sound fields. Study on the reduction of jet noise has already been carried out, and the Perforated Tube could decrease jet noise at high pressures. However at low pressure peculiar sound noises were detected. Now this paper report our study of investigation concerning directional characteristics of jet noise of perforated tube in the field around the jet nozzle by using new measuring method of an Optical Wave Microphone System.
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Masataka KOSAKA, Kunisato SETO, Yoichi NAKAZINO, Yoshito SONODA
Article type: Article
Session ID: 4904
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Laser beam is finding increasing use on the information science. An Optical Wave Microphone System in the present study is an sound measurement equipment by laser beam and needs not use any particle in the flow. This device does not disturb in the measurement field, that is the merit of this device. For this reason, this technique is useful for the measurement of an jet noise. In this research, the reliability of an Optical Wave Microphone System for the measurement of jet flow was investigated and the downstream propagation of the broadband shock associated noise was analyzed.
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Kazuma KUROKI, Youichi KANEMITSU, Shinya KIJIMOTO, Kouichi MATSUDA, Yo ...
Article type: Article
Session ID: 4905
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A study of a hydrogen use fuel cell system is promoted from the viewpoint of environmental measures and energy problem. As for the fuel cell-powered vehicle in particular, marketing is expected in the near future. However, constructing of infrastructure for a leak gas detection system is necessary for the safe use of hydrogen for the spread of fuel cell systems. We use simulation in this article and grope for acoustic technology use gas detection method for large-scale space and danger of accumulation/explosion assumes in particular a basement parking area in the case of gas-leak. In this paper, we mainly consider on a sound condition change when a car was posted in space.
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Makoto MURAOKA, Md.T.I Khan, Kunisato SETO
Article type: Article
Session ID: 4906
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This study shows the reduction of a jet noise by installing a parabola light reflector at a nozzle exit. The pressure level of jet screech which is one of the jet noises is so high, that may cause an acoustic fatigue around the nozzle exit. Since the influence of jet screech on a makeup near the nozzle exit is concerned about. At 90 and 120 degrees, the jet screech could be cancelled by installing a parabolic reflector and except components of lower frequency, broad band noise was also reduced at those directions
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Nobutaka TSUJIUCHI, Takayuki KOIZUMI, Masafumi NISHIMURA
Article type: Article
Session ID: 4907
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Active noise control is the method that attenuates the noise, especially at low frequencies. In almost all the case, Filtered-x LMS algorithm is used as its adaptive algorithm. However, Filtered-x LMS algorithm has a fault that cannot follow suit for the change of acoustical transfer function. For this reason, the purpose of this research is modification of Filtered-x LMS algorithm in order to follow up the change of acoustical characteristics. We design new ANC controller by applying optimization algorithm (Least Mean Square Algorithm), and the performance of the controller has been verified on a simulation with MATLAB.
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Shinya Ito, [in Japanese], [in Japanese], Toru Watanabe, Kazuto Seto
Article type: Article
Session ID: 4908
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Recently, research and development on non-contacting control technology utilizing acoustic radiation pressure (ARP) has been performed. Watanabe had presented a direct control mechanism of ARP by modulating the oscillating current that excites the ultrasonic vibrator. In this research, am electronic control system is introduced to realize ARP control. Moreover, experimental ARP measurement system is developed to measure ARP precisely. Using these systems, the dynamics of the entire ARP control system is identified. Meanwhile, non-contact experiments are carried out. A simple pendulum is adopted as a control object. Two welders are located symmetrically with the direction of oscillation. Control results showed good control performance. These facts indicated the effectiveness of the presented ARP control system for non-contacting control.
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Kazuhide Ohta, Kazuhiro Yoshizumi, Jun Mizuhaya, Iwao Honda
Article type: Article
Session ID: 4909
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Fuel injection pump driven by the crankshaft gear via gear trains is considered one of the major noise sources of the internal combustion engine because it injects instantly the fuel fluid at high pressure and induces the impulsive vibration of the gear trains and pump structure. This paper presents the theoretical procedure to predict the vibratory response of the engine block coupled with the rotating crankshaft and gear train shafts which drives the fuel injection pump and valve system. Moreover the engine noise radiated from the engine block surface is evaluated using the spatially averaged mean squared velocity and acoustic radiation efficiencies of the engine block. This method is applied to estimate the effect of the backlash of the gear system and the fuel injection pressure onto the engine block vibration and radiated noise.
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Kazuyoshi Otake, Yoichi Nakazono, Kinya Matumoto, Takumi Saruwatari
Article type: Article
Session ID: 4910
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In our previous study, water was continuously spouted to the water surface. When music is played by a common aerodynamic music instrument, the time of the note is generally shorter. Therefore, the basic experiment on the present water music instrument has been carried out under the same short time condition with the music aerodynamic one. The main purpose of the present study is analyzing the generating mechanism on rain-drop music instrument. As the results, at time of about 50msec after the water jet hits against the water surface, the sound is generated. The presence of the resonance tube makes a longer resonance time. When a part of the resonance tube is sunk below the water surface, the dominant broadband components of a sound pressure spectrum shift to lower frequency side.
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Qin ZHU, Mitsuaki ISHITOBI
Article type: Article
Session ID: 4911
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A method by computations of energy distributions from the result of continuous wavelet transform is proposed to detect chaotic response. The results of the case studies show that the method can be used to identify the chaotic vibration with relatively short time history and it has advantages over power spectral analysis.
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Kenzo SATO
Article type: Article
Session ID: 4912
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This report presents the study on the free flexural vibration of an elliptical plate whose edge is rigidly supported against displacement and restrained elastically against rotation. In addition, the plate is subjected to a uniform in-plane force in its middle plane. The vibration solution is rigorously obtained in a form of Mathieu function series according to the ordinary thin plate theory neglecting the effect of shear deformation and rotary inertia. The frequency equation is derived by applying the orthogonality of the Mathieu function. The dimensionless eigenfrequencies calculated numerically are tabulated against various dimensionless rotational spring stiffneses and in-plane forces for some aspect ratios.
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Daisuke KONDO, Takahiro KONDOU, Kenichiro MATSUZAKI, Nobuyuki SOWA, Ta ...
Article type: Article
Session ID: 4913
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A rational reduction method using modal analysis is developed in order to analyze accurately stability of a large-scale system with local parametric excitation. Nodes without parametric excitation are transformed into the modal coordinates, and the modes with significant effect on computation accuracy of the stability analysis are extracted. On the other hands, the remaining modes with small effect are appropriately approximated and are eliminated. The very accurate low-dimensional model is constructed by these procedures. The effectiveness of this method is verified from the computational results.
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Tsuyoshi INOUE, Yukio ISHIDA, Akinori TAKAHASHI
Article type: Article
Session ID: 4914
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The vibration characteristics of the translation motion and inclination motion coupled systems are studied by numerical simulation. The occurrence of the auto-parametric resonance at the resonance point of the translational motion at 1st and 2nd modes are observed when the ratio between the natural frequencies of the inclinational motion and the translational motion are close to 1:2. The occurrence regions of the auto-parametric resonance and the almost periodic motion are discussed.
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Yukio ISHIDA, Tsuyoshi INOUE, Kohei NAKAMURA
Article type: Article
Session ID: 4915
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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With the development of wind power generation, the vibration and noise become a serious problem. The wind turbine blade has unique characteristics that long large blades rotate in a verticl plane under the action of gravity. Because the velocity of the wind is different between at low and high positions, a periodic excitation force works to the blades. In addition, a pulse works to the blade when the blade passes near the pole. In this research, the blade is modeled by a rotating elastic cantilever beam. It is clarified that various kinds of resonances occur. Their vibration characteristics are clarified by the simulation.
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Takayuki KOIZUMI, Nobutaka TSUJIUCHI, Shun OHNO
Article type: Article
Session ID: 4916
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Fuel-cell stack is laminated with a number of cells, and the latest stack is assembled by pressure from both ends. When this structure is exposed to external vibration, it is probably that lateral structural collapse or leak of fuel gas occur. For this reason, the purpose of this research is understanding vibration characteristics of fuel-cell stack. At first, natural frequencies and natural modes of spent small-size fuel-cell stack (1kW type) are acquired by experimental modal analysis. Next, the finite element model of small-size stack is constructed and model parameter is determined so that analytical natural frequency correspond with experimental value. Finally large-size stack(10kW type) FEmodel is constructed by scaling the small-size stack model, and modal parameters of large-size stack are predicted.
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Satoshi Imai, Atsuhiko Shintani, Tomohiro Ito, Katsuhisa Fujita
Article type: Article
Session ID: 4917
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Simultaneous separation and transportation method by using vibration is investigated. By inputting the elliptical vibrations in three directions, the works in the shaking table are transported to one direction. On the other hand, the works are separated corresponding to the friction coefficient by regulating frequency and the phase difference between the two exciting directions of shaking table. Combining two methods, the works are transported and separated simultaneously. In this paper, the separation accuracy and the transportation velocity are introduced as indexes. Performing the parameter study, the effects of the phase differences, exciting frequencies and exciting amplitudes are considered.
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Yuki Machida, Katsuhisa Fujita, Tomohiro Ito, Michihiro Ichihara
Article type: Article
Session ID: 4918
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A ladder truck with lift mechanism has played an important role in life-saving and fire-fighting. Although the quicker operation mechanism is requested for these demands, the lift operation generates a lot of vibration in the extending and retracting and ascending and descending motions. In this paper, the model of the ladder truck is proposed and two control methods for ladder are investigated. The first is the control of driving input wave. By selecting the appropriate input waveform, the vibration of the ladder is reduced. The second is optimal control for ladder subjected to impulse load. Performing the simulation studies, the effectiveness of control method is shown.
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Kunihiko ISHIHARA
Article type: Article
Session ID: 4919
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In turbo-machines such as a turbine and a compressor, the vibration of a rotor blade becomes a problem. The major cause is the resonance by fluid forces due to the viscous wake of the proceeding blade row and the use of a high damping material is effective to the protection. The material damping has usually been evaluated for only the first mode and the material damping of higher modes has been assumed to be the same as that of the first mode. This time the damping of various modes of the long blade could be obtained by using the rotating test rig. The result showed that the effect of vibration modes on the damping ability was small. This fact was verified by using the concept of the specific damping.
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Tadashi Senoo, Tomohiro Ito, Katsuhisa Fujita
Article type: Article
Session ID: 4920
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In our daily life, we can keep standing without any consciousness, even when we are subjected to the base excitation such as earthquakes or train motions. However, it can be said that from the view point of dynamic behaviors, the maintenance mechanism of standing state is not fully clarified. Especially for the old people, the risk for overturning increases due to decreasing muscle power. And this will cause some handicaps in walking. Thus, to study the dynamic behaviors and the stability of the human subjected to the base excitation is vety important. In this study, the maintenance mechanism of standing state is investigated using a simplified dynamic human model, which consists of 4 body components.
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Shigeru AOKI, Takeshi Otaka, Yuji Nakanishi, Tadashi Nishimura, Mitsuy ...
Article type: Article
Session ID: 4921
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A new device for reduction of seismic response of mechanical system is developed. The device is friction bearing which consists of upper and lower plates with spherical concaves and spherical metals. Seismic response is reduced by friction between plates and metals. A console rack is set on the device and shaken by the shaking table. Acceleration response of rack is measured. The maximum values of the response and the excitation, sum of squares and power spectrum are obtained. It is concluded that the repose is significantly reduced.
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Masanori SHINTANI, Hiroyuki SHUME, Hajime TAKADA, Tadashi KOTERA
Article type: Article
Session ID: 4922
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper deals with nonlinear vibration of a continuum system with gaps under stationary random waves considered collision phenomena. In order to investigate this nonlinear vibration characteristic, experiments are made with an experimental apparatus consisting of a nonlinear vibration system. An analytical model of the cubic equation is proposed based on the restoring force characteristics in the maximum deflection curve. And, in the analysis, the dissipation energy is replaced with an equivalent viscous damping ratio. Moreover, the widen gap is taken into consideration in the analytical model by the original supposition method. This analytical model is used for the simulation analysis, and the results are compared with the experimental results. In the thickness is 1.6mm and width is 5mm, the simulation results and the experimental results showed similar shape from the restoring force characteristics and nearly value from the result of the R.M.S. values.
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Masanori SHINTANI, Naoya TAGUCHI, Yuichi HATTORI
Article type: Article
Session ID: 4923
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper deals with development of new isolation device by using friction force. This isolation device carries out reduction of horizontal relative displacement by using friction force. This isolation device works also as a damping device. The isolation device uses a slope plate. The Friction force acts on the slope plate. The restoring-force is given to the isolation device from the compression spring attached to the base. In the equation of motion of analytical model, the friction force and the restoring-force change in proportion to displacement. The restoring-force always works in the direction of a center. Simulation analysis is calculated on various conditions using the analysis model. Reducing both response acceleration and displacement is confirmed in analysis results. Furthermore, an experiment is conducted using the experimental model to confirm analysis results. The analysis results are compared with experimental results and examined. The performance of this isolation device is examined.
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Hiroko MORINO, Akinori TSUJIKAWA, Kazuto SETO, Toru WATANABE
Article type: Article
Session ID: 4924
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In this report, a new device called pendulum tuned mass damper (PTMD) is proposed to reduce the vibration of three story houses. In recent years, three stories houses are built increasingly in the urban areas to obtain wide living space in a small space. Such houses are often subjected to numerous vibration problem caused by the traffic vibration Meanwhile, PTMD acts on the principle of lever mechanism and this expands the inertial force of small mass by leverage. Moreover PTMD is cost effective and can be placed between the first and second floor. Therefore PTMD is ideal for such houses. The vibration control effects of PTMD are verified through simulation and experimental studies.
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Takashi KITAMURA, Takahiro KONDOU, Nobuyuki SOWA, Hiroki MORI
Article type: Article
Session ID: 4925
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Pattern formation phenomena often occur in contact rotating systems. These phenomena are regarded as unstable vibrations caused by time delays due to viscoelastic deformation, cutting, wear and so on. A prevention method by using dynamic absorbers was suggested and an optimal design method of the dynamic absorbers was formulated in the previous reports. However, much computation time is required to establish the optimal parameters for multi-degree-of-freedom since systems design variables increase. The authors suggest an efficient design method of dynamic absorbers, in which the dynamic absorbers are individually designed one by one for each mode. The effectiveness of the present method is verified from the results of numerical computations for a two-degree-of-freedom system as the most fundamental example.
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Yukio ISHIDA, Jun LIU
Article type: Article
Session ID: 4926
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In general, when the clothes tend to clump in a washing/spin machine that is rotating, it is well known that serious vibration of the machine and noise are inevitability. So various methods for vibration suppression were proposed, but there is no one effective or good solution to overcome the problem now. If a large vibration and noise occur in spin mode in a washing/spin machine, the machine may be stopped automatically by the safety-device in the washing/spin machine, which cause not only water repumped into the washing machine, but also the machine re-started after later. In the paper, the vibration characteristics of the washing/spin machine are analyzed, and author proposed a simple method before and used to suppress steady-state vibrations by using discontinuous spring characteristics, which can also be used to suppress non-stationary vibrations to the desired small magnitude. The validity of the method has been verified theoretically and numerically.
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Tokuo TSUURA, Shigeo NAKAI, Kenichi OTANI, Yoshimasa TAKAGI
Article type: Article
Session ID: 5406
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Environmental issues are attracting the concern of people all over the world. In Japan, initiatives for the development of eco-communities are taken, as seen in a variety of new legal frameworks as well as such grass-roots developments as the green consumer movement. We have developed a technology for immobilizing large quantities of functional particles in pulp. Recently we developed a pulp mold runner able to resist temperatures above 1,400℃, and therefore suitable for iron or steel casting, by immobilizing inorganic fibers and thermosetting resin in pulp and forming it into a three-dimensional shape. The pulp mold runners are only one-tenth the weight of conventional ceramic runners. In addition, they are easy to cut and can be fitted to one another. As a result they are excellent both for workability and for the work environment. Marketed under the name of EG Runner, this product also helps to reduce waste ; in fiscal year 2005 one factory achieved to reduce more than 200 tons waste.
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Koudai MOROIWA, Masanori KIKUCHI, Kimitaka HIRANO
Article type: Article
Session ID: 5407
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Biomass fuel mixed high-moisture swine excrement with low quality wood charcoal is burned in the combustion furnace of a fixed-bed type. The three dimensional combustion gas flows in the furnace are analyzed by the finite volume method with the FLUENT software. Combustion reaction is assumed as the one-step overall reaction. Flows in the furnace are composed of swirling and upward flows, and distributions of velocity, temperature and chemical productions such as CO_2 and H_2O are calculated numerically. The CFD results show that the gas flows satisfy the conditions for countermeasures against dioxin. Gas particles are carried to take staying time of more than 2 seconds through high temperature region of over 1,070K.
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Ichiro NAKANE
Article type: Article
Session ID: 5408
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In the investigation of pollinosis, it is often reported that the rate of appearance of pollinosis is higher in the city than in the country and the patients with pollinosis increase along with urbanization. The main causes of these results are secondary scatter of pollen. Almost all the surface in the city are paved and the pollen on the surface is blown up by the strong wind which flows around the tall buildings. In this paper, the flow behavior of pollen with secondary scatter is studied by the wind tunnel experiment and numerical calculation. The numerically calculated velocity profiles agree very well with the experimentally measured one, and the mean flow behavior of pollen can be predicted by this calculation.
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Yusuke SAITO, Toru TADA, Toru SAWAI, Masuo KAJI
Article type: Article
Session ID: 5409
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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When the woody biomass is utilized as fuel, it is necessary to examine the energy input for collecting of resources, preprocessing such as grinding and drying, conversion, fabrication, and transportation of fuel. In the present study, effects of water content and pyrolysis temperature on the energy required to grind woody biomass are investigated. Test samples used in the experiments are Japanese cedar thinning materials and Ume pruned branches that are made by thermal decomposition in 20 to 500 degree temperature range. The grinding energy of woody biomass decreases with increasing pyrolysis temperature and decreasing water content. To predict the grinding energy of woody biomass, the work index based on the Bond theory is correlated by the pyrolysis temperature.
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Noboru FUJIMOTO
Article type: Article
Session ID: 5410
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Experiments were carried out using the liquid-waste treatment system with fine ozone bubbles. When organic soil pollutions were treated, the values of first-order rate constant within thirty minutes were 0.019, 0.02, 0.036, 0.017, and 0.0065 for Trichloroethylene, Tetrachloroethylene, 1, 1-Dichloroethylene, 1, 1, 1-Trichloroethane, and Dichloromethane respectively. The Arrhenius plot has been estimated.
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Kouji MORITA, Koudai MOROIWA, Akihiro MORITA, Masanori KIKUCHI, Kimita ...
Article type: Article
Session ID: 5411
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This project researches the way that unutilized biomass such as high-moisture swine excrement and low quality wood (cobia) charcoal is effectively transformed into heat energy. This combustion system is composed of the fixed-bed combustion furnace, the preliminary drying machine of rotary kiln type, the heat exchanger, the boiler and etc. As these two biomass resources have very different combustion speeds, it is necessary to make these suitable combination for fuel. At first, the "kneaded fuel" in which the swine excrement is kneaded into the charcoal dust, is dried in the drying machine. Then the "mixed fuel" in which the kneaded fuel is mixed with the granular wood charcoal, is burned in the combustion furnace. The self sustained combustion is succeeded for the mixed fuel that the weight ratio of the swine excrement to the wood charcoal is 60:40. This results show that the swine excrement can be burned.
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Akira Sadamoto, Yasuji Tsubakishita, Kazuo Ogino, Seiji Shirahama
Article type: Article
Session ID: 5412
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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There are some commercial products of ventilator which have their own sound attenuation effect. The ventilator consists of a cylindrical fan unit, a rectangular box as an outer cover, and an orifice plate which faces the fan's inlet. The space surrounded by the outer cover and the orifice plate is supposed to act as a resonance box. In this research, the sound attenuation effect is experimentally verified using a model of rectangular chamber containing an internal cylinder placed in an infinite circular duct. While a simple rectangular chamber with short clearance in duct axis direction in a circular duct shows a typical resonator property, the another model of this research attached additional space between the box and the cylinder shows some peculiar properties as follows: (i) two resonance frequencies are obtained ; (ii) the first resonance frequency is lower than the one of the simple chamber ; (iii) the insertion loss at the first resonance frequency is greater than that of the simple one.
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Minoru SATO, Yoshio NISHIMOTO
Article type: Article
Session ID: 5413
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The proper processing technology of hydrocarbon refrigerant isobutane (R600a) is required to prepare for recycling of the refrigerator. Isobutane extracted from the refrigerator compressor is diluted with air below the flammable range, is oxidized to CO_2 and H_2O by using a palladium catalyst. This paper describes the prototype isobutane oxidation system and its oxidation characteristics. In order to maintain the catalytic conversion efficiency highly, it is required to keep the catalyst inlet gas temperature more than 623K. Exhaust gas recirculation is effective for preheating of gas temperature.
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Keiji Saka, Yuya Nishi, Tomoharu Doi, Yoshitsugu Asou, Yoshinobu Katsu ...
Article type: Article
Session ID: 5414
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A society system of mass production, mass consumption and mass wastes causes serious environmental problem. Especially, the poison such as the soot exhausted by the diesel engine is a problem. Recently, because the chemical composition of light oil as the diesel engine fuel is assumed the problem, the biography diesel fuel is paid to attention as a light oil alternative fuel. The biography diesel fuel is made from the methanol, the potassium hydroxide, and the abolition vegetable oil. In this Research, we have aimed at systematization of biography diesel fuel production by supersonic wave, evaluation the system, and development for practical production.
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Yuya Nishi, Keiji Saka, Tomoharu Doi, Yoshitsugu Asou, Yoshinobu Katsu ...
Article type: Article
Session ID: 5415
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Recently, Environmental problems of global warming and depletion of resources etc. have become aggravated. As one of the solution, Bio Diesel Fuel (BDF) that is the alternate fuel of light oil is paid to attention. BDF is clean energy where SOx is not generated when burning because it uses botanical wasted oil where the sulfur element is not included for the raw material. However, in the method by the stir of the past it takes time to produce, mass production is difficult because the production in series is impossible, and there is a problem that costs rise more than light oil. In this research, the mixture fluid of wasted oil and the methanol that is the raw material of BDF is made for a methyl ester to react by the supersonic wave and it will produce in a short time compared with the stir method and element of obtained fuel and vehicle exhaust emission when burning with engine are evaluated.
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Hisahiro INOUE, Takaaki HASHIMOTO, Yoshihisa ASANO, Eitaro SAKATA
Article type: Article
Session ID: 5416
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes some performances of wind turbines with sail wings. The experiments were carried out by changing the supporting method of sail wings. It was cleared that the shapes of sail wings give a large effect on the electric power of wind turbine. In the present experiments, the supporting method by two rubber threads was optimum.
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Yoshihisa Asano, Takaaki Hashimoto, Hisahiro Inoue
Article type: Article
Session ID: 5417
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We have been studying about small wind turbines with sail wings because of high performances for small scale wind generation. We will be able to discover many good factors for progress of sail wing type wind turbines by analysis of propeller type wind turbines. This report indicates an experiment on small propeller type wind turbines. We think that propellers with small radius, many blades and high pitch angle are supposed to be suitable for small scale wind generation.
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Mitsuru MANABE, Yasuhiro ITTANDA, Shingo OKAMOTO
Article type: Article
Session ID: 5418
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The purpose of this study is to investigate a proper method to prevent water-leak through the joints of precast concrete pipes for drainage that are constructed under the ground. Then this study is targeted for flexible rubber joints since those are tough against disasters such as earthquake or settlement. The test specimens were made of rubber of A50 and A60 in hardness. The relationship between the deformation of test specimen and the compressive load, and the hydraulic pressure when water leaks through between the test specimen and the steel slate were measured using the developed experimental setup.
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Yasuhiro ITTANDA, Mitsuru MANABE, Shingo OKAMOTO
Article type: Article
Session ID: 5419
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The finite-element analysis was performed, that follows the experiments reported in the first paper. The analysis model is composed of the test specimen of rubber and the two steel plates to compress the test specimen. The calculations such that the test specimen is compressed by two steel plates, were carried out using the variable values as Young's moduli of the rubber. Then Young's modulus of the rubber used in this study was identified by comparing the calculated results and the experimental ones.
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Toshihito IKENISHI, Takayoshi KAMADA, Masao NAGAI
Article type: Article
Session ID: 5519
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Computer interface and machine interface that used human information are researched as communications and control capabilities for people with severe disabilities. This research aims to develop the vehicle driving control system and the vehicle driving support interface that used human information in this research. The driver's intention recognition is necessary from human information when the vehicle is driven. Then, the algorithm that recognizes the driving steering intention from the electroencephalogram (EEG) is developed and the performance is evaluated.
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Yuya Hamada, Minoru SASAKI, Atsushi Ishida, Satoshi Ito
Article type: Article
Session ID: 5520
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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An man-machine interface using EMG and EOG bio-potential signals for controlling one-axial positioning system is developed. Relationship between chewing force and EMG signal has linearity. EOG signal is in proportion to acceleration of eye movement. EMG signal is used for on-off switching and time integration of EOG signal with dead band is used for servo motor input signal. Experimental results of operation show that beginner is not easy to operate the one-axial positioning system with a servomotor. However, after training the operator can control the servomotor system by using the man-machine interface. This system is easy to extend more complex systems such as multi-degree of freedom robots.
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Tohru YAGI, Atsuko MIYANAGA, Hiroshi NUMATA, Kazuo KOGA, Arao FUNASE, ...
Article type: Article
Session ID: 5521
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes an eye-gaze interface using a biological signal, electro-oculorgram (EOG). This interface enables a user to move a computer cursor on a graphical user interface using eye gaze movement alone. It will be useful as a communication aid for individuals with mobility handicaps. Although EOG is easily recordable, drifting and blinking problems must be solved to produce a reliable eye-gaze interface. Here we introduced a calibration method and a feedback control to overcome these problems. In addition, we described a simplified interface for a user to switch ON/OFF in a nurse calling device.
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Makoto SHIMURA, Yosuke MOTOHASHI, Ichiro YAMADA, Jean-Jacques DELAUNAY
Article type: Article
Session ID: 5522
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Although emotion analysis is becoming increasingly important in the assessment of newly developed communication terminals, there exists no established method to predict emotions. In this report, we examined the classification of emotions using a combination of electrocardiogram (ECG) data and respiration data. ECG data together with respiratory data were collected on subjects watching a movie, and subjects' changes in emotional states were monitored by questionnaires. Training and validation datasets on five emotional states (fear, joy, disgust, anticipation and neutral state) and ten subjects were prepared using standard data division. The Mahalanobis distance model was used to predict the five emotions. Percentage of correct classification was 37% when the complete dataset (all subjects) was used as a training dataset and increased to 64% when individual training datasets were used. Though the combination of ECG and respiration data proved useful in improving the classification of emotions, the major improvement in classification score was achieved by using individual datasets.
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Ichiro KITAYAMA, Ryoji OTUBO, Kiyohiro OMORI, Yoshimi SUGIMOTO, Hidehi ...
Article type: Article
Session ID: 5523
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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There are some Environmental Control Systems (ECS) for severely disabled persons. It is useful for them to enhance the quality of life by using ECSs. On the other hand, since these equipments are expensive because of complex works for setting them up, it is impossible for disabled persons to use them widely. In this research, we develop the systematizing support system which can be combined and built according to a life of a disabled person. We aim at offering an inexpensive support apparatus which has a necessary minimum function. We make a field test about our ESC in a severely disabled person's home, so we have a good result for the disabled.
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Ikuma SATO, Ken MASAMUNE, Takeyoshi DOHI, Akihiro NAGANAWA, Teruyoshi ...
Article type: Article
Session ID: 5524
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Development of surgical mechatronics system under MRI environment is now becoming popular to realize minimally invasive treatment. We're developing the MRI compatible needling surgical robot with ultrasound motors to move inside the MRI gantry. In this paper, we focus on the leakage of electromagnetic-wave as the newly evaluation method of MR compatibility. We coped with electromagnetic waves by covering the actuators with aluminum shields. S/N ratio and the distortion caused by the manipulator was evaluated and the results indicated that our robot has highly MR compatiblity inside the MRI gantry.
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Koichi SAGAWA, Syuko ABO
Article type: Article
Session ID: 5525
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Measurement method of three-dimensional trajectory of forearm during baseball pitch using body-mounted sensor is discussed. From the optical motion capture system, it is estimated that the acceleration and the angular velocity of the arm reach up to 100 [G] and 8000 [deg/s], respectively, when the professional level baseball pitchers play the best throw. Three-dimensional, low gain accelerometers and gyroscopes in addition to high gain sensors are employed to avoid the saturation of the measured signals from the sensors. The trajectory and direction of the forearm are calculated based on the numerical integration of the acceleration and angular velocity. Integral errors are rejected by the definition of initial and final velocity, position and direction of the forearm. The experimental results showed that the estimated position and angle of the forearm highly corresponded with the video image. The proposed method enables easy, inexpensive and independent measurement from location.
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Daisuke TSUCHIMI, Mami TANAKA, Yoriko TAKAHASHI, Ryoichi TOMINAGA, Sei ...
Article type: Article
Session ID: 5526
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Activities of the skeletal muscles produce body movement, maintain body postures and position as well as support soft tissues. Monitoring the muscle activities is very important in rehabilitation, physical training, and in the development of life-support equipment for physically disabled persons. Myodynamometer and electromyogram (EMG) have been widely used for monitoring muscle activities. However, these methods monitor the contraction of the muscle indirectly. Recently, mechanomyogram (MMG) has attracted much attention for its ability to directly monitor the muscle contraction. The MMG is a recording of the mechanical vibration on the body surface caused by the dimensional change of the muscle fibers, and thus directly reflects the contraction of the muscle. Using of the MMG, it is expected that more detailed information of muscle activities such as muscle fatigue, which is difficult to be monitored by myodynamometer and EMG, can be obtained, as well as information of the activities of slow and fast fibers. However, current MMG sensors are only suitable for monitoring the isometric contraction of muscle, thus current studies using MMG mainly focus on the monitoring of the isometric contraction of muscle, for example, muscle fatigue estimation. Study of the MMG on the monitoring of non-isometric contraction of muscle has not yet thoroughly been done. In this thesis, a novel MMG sensor system that can be used for monitoring both the isometric and non-isometric contraction of muscle is developed.
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Kazuhiko SASAGAWA, Hisayuki YAJIMA, Kanoko HOSOKAWA, Izumi KONDO
Article type: Article
Session ID: 5527
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Lymphedema is defined as tissue swelling due to accumulation of protein-rich interstitial fluid caused by a low output failure of the lymphatics. For treatment of lymphedema, combined manual therapy, often referred to as complex decongestive physiotherapy (CDP), has emerged as the standard of care. Elastic compression stockings are used in CDP. To do the therapy using elastic compression stockings effectively, it is necessary to compress lower limbs appropriately. But contact pressure on lower limb when wearing elastic compression stocking has not been measured in detail. In this study, measurement system of detailed pressure distribution using pressure-sensitive conductive rubber sensor was developed for measuring contact pressure distribution between lower limb and elastic compression stocking.
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Yoshihiko NOMURA, Yuki YAGI, Tokuhiro SUGIURA, Hirokazu Matsui, Norihi ...
Article type: Article
Session ID: 5528
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A fingertip guiding manipulator was developed as a haptic graphic display for blind people: it helps them create mental images of raised graphics and reliefs with stroke order. The mechanical part of the manipulator has 4-DOF (degree of freedom): a knob's horizontal and vertical position (3-DOF), and its rotation. Users are assumed to pinch the knob by their fingertips. Through fingertip kinesthetic sense, while foreseeing the direction of the upcoming stroke by perceiving the knob's direction, they experience the uplifted and fallen strokes by perceiving their fingertips being pulled in the horizontal and vertical directions. The direction-indicating function presents a preparation effect, and the leading function, a reviewal effect. Especially, the up-and-down motion resembles to pen's up-and-down, and the up-lifting function expands a representation capability from "single stroke graphics" to "multiple stroke graphics.
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