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Munekazu NISHIKAWA
Article type: Article
Pages
95-96
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Hiroto AOKI
Article type: Article
Pages
97-98
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The environmental destruction by the exhaust gas from diesel engine is the most major cause for air pollution. Therefore, many solution methods have been studied. That major solution is DPF (Diesel Particulate filter). However developed devices cannot capture smaller particle than 1μm in exhaust gas. Then, electric field was applied in this research. Particles were captured by input of Direct current to electrode plates. Its characteristic showed that the increasing of voltage made much captured particles. By distance spreading between electrode plates with constant electric field, the effect of electrode on capture decreased slightly. When input voltage changed to Alternating current, particles cannot be captured over 100Hz
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Ryo NAKATSUKASA
Article type: Article
Pages
99-100
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes the effect of traction oil on the power loss of spur gear. In this study, four traction oils and a turbine oil were used. The power loss was separated into gear friction loss and oil churning loss. Effects of gear torque, gear speed, and oil temperature on the friction loss were investigated. Besides, the flash temperature on the contact surface was measured using a dynamic thermocouple, and the lubrication condition was observed using electrical resistance. The relationship of the gear friction loss to the lubrication condition on spur gear is discussed.
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Yousuke Nagaki
Article type: Article
Pages
101-102
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Computer Aided Design (CAD) is the most common tool used in industries to assist in product development. Recently many CAD systems become more complicated in order to equip the many convenient functions. But such CAD systems have too many functions, so the are not easy to handle for beginners of design or drawing. A CAD system considered easy handling for the beginners is developed by object programming method and presented in this report. The developed CAD system has the limited functions, but enough to use the mechanical drawing.
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Nobuhiro TANAKA
Article type: Article
Pages
103-104
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The tribological behavior of micro mechanical systems plays a key role in the performance of such systems. Consequently, it is necessary to quantitatively understand the friction and wear properties in ultra minute region because the influence of the surface topography and the atmospheric gas can't be disregarded for making the component minute. Especially, external disturbance, i.e. vibration may promote fretting, which have been hardly studied in nano/micro-scale. In this paper, we investigated the influence of the normal load, the sliding velocity and the displacement of sliding on lateral force. The lateral forces were measured by using AFM with various conditions under the controlled relative humidity. The test materials of single-crystalline <111> silicon plates were rubbed against a spherical tip made of glass at load ranging from 20nN to 80nN. When sliding velocity is low, lateral forces become large. Lateral force linearly increased with normal load. In the case of spherical tip, tangential micro-displacement is compared with Mindlins model in fretting, it is in agreement with the Mindlins theoretical formula which load is changed into normal load plus pull-off force.
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Masashi YAMANAKA, Koji KUMAGAI, Katsumi INOUE
Article type: Article
Pages
105-106
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The traction coefficient generally decreases according as the temperature rise. In this study an effect of heat in the contact area to the characteristic of tracion oil at low temperature is examined and the precise measurement of traction coefficient at low temperature is developed modifying the method of temperature measurement. The film temperature is estimated by the formula and the bulk temperature is measured by the thermocouple which is put beneath the roller. The traction coefficient is measured at low temperature in case of the traction oil and the traction grease. The maximum traction coefficent changes according as the temperature and shows the peak at 300K. It decrease in the range less than 300K. The difference between the traction coefficient of the traction oil and that of the traction grease is not observed.
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Atsushi Miyoshi, Hiroyuki Nakagawa, Koei Matsukawa
Article type: Article
Pages
107-108
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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A model is proposed to estimate the contact force applied to a single particle in a CMP slurry the Greenwood - Williamson contact model. Using this model and the atomic force microscope, the simulation on polishing of the SiO2 by the single particle in CMP slurry is carried out. To verify the validity of the simulation, we perform the estimation of the material removal rate of a SiO2 slurry. As a result, the simulation with this model and AFM test can estimate the material removal rate of real CMP processes.
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Tsuyoshi HASHIZUME, Shojiro MIYAKE, Shuichi WATANABE, Masahiro SATO
Article type: Article
Pages
109-110
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Our study is to research for tribological properties of diamond-like carbon (DLC) films on various polymers. DLC film is one kind of thin hard films. Among the tribological properties of the film, its most remarkable features are on low-friction coefficient and anti-wear. This report deals with the deposition of DLC films on various polymer substrates in vacuum by magnetron radio frequency (RF) sputtering method with using argon plasma and graphite target. Polyamide6(PA6), polyphenylenesulfide(PPS), polyetheretherketone(PEEK) were used as substrate. The properties of friction and wear are investigated using a ball-on-disk weartesting machine. The friction coefficient of DLC coated specimen is lower than that untreated specimen.
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Yukio SEKINE, Shojiro MIYAKE, Shuichi WATANABE, Junichi NOSHIRO
Article type: Article
Pages
111-112
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Tribology is a key technology of modern triboelements used in advanced industrial fields such as micro machines, large scale integrated circuits manufacturing systems, magnetic recording head-media interfaces and mechanisms for use in space. In these fields, atomic-scale wear and minute fluctuations in friction, so-called the microtribological properties, have influence on equipment performances. Therefore a hard and lubricating film, not the conventional solid lubricant film, is requested to reduce atomic-scale wear and friction force fluctuation. Nanometer period multilayer film was expected to show good solid lubricating property. Tungsten disulfide and molybdenum disulfide multilayer films were deposited, and then tested. Tungsten disulfide and molybdenum disulfide multilayer films were deposited by RF sputtering using two kinds of targets. The multilayer (WS/MoS)n films were deposited by controlling the depositing time for each of the targets. Nanoindentation hardness. The frictional properties of the (WS/MoS)n films were better than those of other films in the ball-on-disk tribotest.
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Yuko HIBI, Yuji ENOMOTO, Shinya SASAKI
Article type: Article
Pages
113-114
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Ti based composites containing TiN and Si_3N_4 were produced by spark plasma sintering method to develop wear resistant materials. The composites consisted of Ti, Tin, Si_3N_4 and TiSix. Sliding tests were conducted in which a composite disk was slid against a pin of the same material in water, in artificial sea water and in ethanol. The wear of the composite was much smaller than that of Ti metal in the tested conditions.
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Yasuo KONDO, Hiroki AZUMA
Article type: Article
Pages
115-116
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Friction and wear characteristics of natural iron sand coating were experimentally examined in the absence of lubricant. The coefficient of friction was around 0.6 regardless of the sliding distance. The amount of coating worn away was very small at a nominal pressure of less than 3MPa. Two types of friction model were conjectured to interpret the friction and wear characteristics of iron sand coating. In both models, the fine iron sand particles, which were formed by tearing of rubbing surfaces, may play an important role. One model is explained by a ball bearing effect of fine particles. The other is a lubricant formation model ; the frictional heat turns the fine particles into a lubricating film of Fe2O3.
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Yasuhisa HATTORI
Article type: Article
Pages
117-118
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This report deals with contact problem of rectangular poroelastic body put between two parallel impermeable rigid planes, subjected to vibrational compression. The problem was analyzed based on two dimensional theory of poroelasticity and load sharing ratio by solid contact and by fluid were obtained from stress components at contact surface. At high excitation frequency, load sharing ratio by fluid becomes large especially at the material center and its phase shift approaches zero, which lead to reduction of load sharing ratio by solid contact and increase of its phase delay. In addition, effects of several parameters to load sharing ratios were examined.
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Fumihiro ITOIGAWA, Ikuo ESAKI, Takashi NAKAMURA, Tomio MATSUBARA
Article type: Article
Pages
119-120
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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An oiliness agent, for example stearic acid, makes reduction of friction coefficient by forming chemisorption layers. Predominant factors over this reduction effect are experimentally investigated in reciprocating friction with small amplitude. In this experimental condition, severe starvation of lubricant in a contact area proceeds with increasing into the friction pass. According as this starvation, defect of the chemisorption layers increases and thus the friction coefficient abruptly increases. Endurance time of chemisorption layer up to abrupt friction increase positively depends on both friction velocity and resting time of upper specimen. These results show that time to re-flow into the contact area and re-from the layer may predominantly influence the endurance of the layer.
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Akira Iwabuti, Tomoharu Simizu, Kaneto Isikawa, Tadashi MIURA
Article type: Article
Pages
121-122
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes wear mechanism of cemented carbide sliding against S45C steel. Following result was obtained by the sliding test. Wear volume was low to about 50m of sliding distance. 50m of sliding distance has low transferred volume and be hard to exfoliate. And, wear volume is proportional to transferred volume. From continuous SEM observation of WC particles on the wear scar, small particles are removed in the early stage of 50m and big particle is isolated. It is thought that wear volume increase with separation of big particles with transferred material.
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Akira IWABUCHI, Tomoharu SHIMIZU, Yusuke NOGUCHI, Hideaki NAKASATO
Article type: Article
Pages
123-124
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Fretting wear is one of the problems that influence operating lifetime of machines. In this paper, we report on the fretting wear behavior of aluminium alloy (A5056) and SUS 304 stainless steel in air and vacuum. Fretting experiments were performed using three combinations of specimens : (1) A5056 vs. A5056,(2) SUS 304 vs. SUS 304,(3) SUS 304 vs. A5056. For the combinations (1) and (2), coefficient of friction is higher in vacuum than in air. But, for the combination (3), coefficient of friction is slightly lower in vacuum than in air. And, wear volume measured shows that the combination (3) has better resistance to fretting wear.
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Yuichi NAKAMURA, Masane FUNAHASHI, Yasushi KUROSAKI
Article type: Article
Pages
125-126
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In order to grasp main factor of oil-solidified high-pressure spin traction curves, rough and simple calculations based on creep theory were reported compared with reference experimental data up to 2 GPa mean Hertzian pressure. The calculations were also based on the pure rolling experimental data, whose experiments had been already reported to almost agree with the calculation by creep theory. The important property in solidified oil for traction analysis was only the limiting shear stress (Shear strength). Experimental spin traction curves of references were almost expressed by the calculated curves for all spin angles. In the creep theory, apparent slide is induced from surface displacement in contact area by elastic shearing of rotating rollers and is independent of oil film thickness (velocity).
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Akira Hasuike
Article type: Article
Pages
127-128
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The air film thickness between a foil and a drum is studied experimentally using a measuring system under conditions where the Air film thickness is effected by the bending stiffness of the foil. For comparatively flexible foil cases, the experimental results coincide fairly well with theoretical ones obtained by applying the separation boundary condition. For cases with stiffer foil conditions, the tendency of the experimental results may also be explained well by the theoretical analysis, by introducing the concept of the tangency pint condition as well as the infinity point condition for the film pressure generration point The theortical tool of Finite Element Method is used to analyze film thickness and pressure distribution in a foil bearing for various values of foil stiffness, The calculated results agree with the experimental data, and it is concluded that the shallow shells model is useful and accurrate.
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Yasumi OZAWA, Takashi OKADA
Article type: Article
Pages
129-130
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The heat curing oil film method using thermosetting property oil film is a new oil film method. The heat curing oil film method, in which not only the plane flow pattern in wall surface but also oil film thickness of the steady flow can be measured, is newly developed. The heat curing oil film method is a very useful method for visualization of an air flow in the clearance of an externally pressurized gas-lubricated circular thrust bearing with a central supply hole. The rheological characteristics of the heat curing oil without hardener is investigated in this paper.
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Yasumi OZAWA, Juichi KATO
Article type: Article
Pages
131-132
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The complicated phenomena such as pressure depressions, shock waves and the negative pressure, are detected in the air flow with a large bearing clearance or high supply pressure in an externally pressurized gas-lubricated circular thrust bearing. The pressure depression, which decreases the bearing load carrying capacity, is an undesirable phenomenon occurring in this gas bearing. The negative load carrying capacity for the non-contacting suspension support of the object utilizing the negative pressure of this gas bearing is investigated experimentally, and is also discussed in this paper.
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Hiromu HASHIMOTO, Kotaro MATSUMOTO
Article type: Article
Pages
133-134
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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To enhance the bearing stability, noncircular type bearings are often used instead of tilting-pad journal bearings. When the optimum design method is applied to elliptical type journal bearing, it is found that the stability of the bearing could be improved greatly by choosing bearing orientation angle as the optimum. In this study, the effects of bearing orientation angle on the stabilities of rotating shaft are examined theoretically for the cases of six kinds of noncircular type journal bearings which have circular and elliptical base geometries.
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Kotaro MATSUMOTO, Hiromu HASHIMOTO
Article type: Article
Pages
135-136
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes experimental analysis of six kinds of noncircular journal bearings which have circular base and elliptical base geometries. The measurements are carried out for various values, such as vibration amplitude of journal. frequency of journal, and temperature rise of oil film, of bearing orientation angle for each noncircular journal bearing. It was found that the stabilities of noncircular journal bearings are improved remarkably by suitable selection of optimal bearing orientation angles.
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Kazushi Matsukiyo, Atskunobu Mori, Norio Tagawa
Article type: Article
Pages
137-138
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes an experimental study on the effect of surface grooving on tribological characteristics under lubricated sliding contact. START-STOP repetition test and scuffing test were carried out by using slider-disc test machine. An experiment is done with the slider specimen grooved parallel groove in the slide direction. Grooving width and depth were uniformly fixed, and the pitch of grooving was varied. The results reveal that a fine pitch of grooving can lead the surface to run-in quickly and to resist scuffing.
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Hiromu HASHIMOTO, Shun IIDA, Masashi HONMA
Article type: Article
Pages
139-140
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In this study, a new effective numerical methodology for optimum design of high-speed thrust gas film bearings is presented. In the numerical analysis, the boundary fitted coordinates and DF method are suitably combined for improving the applicability to the complicated fearing geometry, such as spiral groove or herringbone bearings. Some numerical results are shown in the graphical form.
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Hiromu HASHIMOTO, Yasushi ENDO, Syun IIDA
Article type: Article
Pages
141-142
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This second paper describes the measurements of static and dynamic characteristics of stepped, pocketed, spiral groove and herringbone gas film thrust bearings. In the experiments, the minimum film thickness, friction torque on the bearing surface and spring and damping coefficients of gas film are measured for a range of rotational speed from 20,000 rpm to 40,000 rpm under a constant stator mass and a fixed step, pocket or groove depth. The measured data are compared with the theoretical results and the applicability of the theory is discussed.
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Minoru ISHIKAWA, Hiromu HASHIMOTO
Article type: Article
Pages
143-144
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In the paper-web transportation systems, the moving web and rotating roller bring the surrounding air between web and roller due to viscosity. As a result, the web-roller interface behaves as the self-acting foil bearings, and it causes a decrease of traction between the web and the roller. Increasing the air film thickness more than the asperity heights of web and roller surfaces, the available traction is nothing more than the fluid film friction which is actually equivalent to the zero-friction. As a decrease in traction in a direct result of air entrainment between web and roller, it is important to predict the friction coefficient including the effects of air film for controlling the traction in many web applications. In this paper, the friction model between paper-web and roller is presented with experimental verifications.
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Masakazu OKAJIMA, Hiromu HASHIMOTO
Article type: Article
Pages
145-146
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This second paper describes the experimental work about the effects of relative humidity on the spacing and friction characteristics between paper-web and roller. Air film thickness between the web and roller (spacing) and friction coefficient are measured by changing the relative humidity for a wide range of web transportation velocity in the cases of coated and uncoated papers. It was found that the effects of humidity on these characteristic is not significant.
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Atsushi KORENAGA, Shinya SASAKI, Kyosuke ONO
Article type: Article
Pages
147-148
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes the properties of the journal bearing using liquid crystal (LC) as a lubricating oil in order to realize the real-time control of the hydrodynamic lubrication characteristic. The change of pressure distribution in applying the voltage to LC was required by the theoretical calculation. We focused on the position where the voltage was applied and examined the effect of the position on the pressure distribution, eccentricity and attitude angle. The results showed the optimum location of electrode to effectively change the pressure distribution and position of journal center.
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Atsusi SHIMOYAMA, Shigeka YOSHIMOTO, Shinsuke Dambara
Article type: Article
Pages
149-150
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Aerodynamic foil bearings have successfully applied to micro-gas turbines for distributed electric power supply. Aerodynamic foil bearings have such advantages that they can operate at high temperature and high speeds. In this paper, the stability of aerodynamic gas foil journal bearings at high speeds is experimentally investigated using a spirally-wound foil bearing with half-spherical bumps and the usefulness of this type of foil bearing is clarified.
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Shinsuke DAMBARA, Shigeka YOSHIMOTO
Article type: Article
Pages
151-152
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes the characteristics of circular aerostatic thrust bearing with a single air supply hole. In case of high air supply pressure or large bearing clearance, it was reported that shock wave occurs and forms complex fluid structure in the bearing clearance. However, it is very difficult to obtain the information of flow structure in detail from flow visualization because of very narrow clearance. Therefore, the flow field was calculated using computational fluid dynamics (CFD) and pressure distribution in the bearing clearance was measured. It was consequently found that pressure distributions obtained by CFD are good agreement with experimental data and that CFD is useful for prediction of pressure distribution in bearing clearance of circular aerostatic thrust bearing.
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Shigeka YOSHIMOTO, Jun TOMIKAWA, Shinsuke Dambara
Article type: Article
Pages
153-154
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Aerostatic journal bearings with compound restrictors have been often used in high speed spindles because of low friction and high accuracy of motion. However, they also have disadvantages such as lower bearing stiffness and smaller load capacity than hydrostatic bearings. We, therefore, propose the method to increase bearing stiffness and load capacity by raising supply pressure to the medium pressure region. In this paper the dynamic characteristics of aerostatic journal bearings with compound restrictors in medium supply pressure region are investigated numerically and experimentally.
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Masabumi MASUKO, Keiji TOMIZAWA, Saiko AOKI, Akihito SUZUKI
Article type: Article
Pages
155-156
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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A new type of cylinder-on-disk tribometer was developed that can measure friction under the boundary lubrication with varying sliding speed ranging from ultra-low (5μm/s) to moderate (17cm/s). As the tribometer was designed to measure friction at the specific positions of the disk surface, fine distinction of friction characteristic depending on the surface condition can be evaluated. This paper presents a special feature of the tribometer by showing several experimental data with both model lubricants and commercially available automatic transmission fluids.
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Masami HARADA, Jyuutaro Tsukazaki
Article type: Article
Pages
157-158
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper presents a new observation method for the oil film flow of the thrust bearings by using the fluorescent microspheres and the structure of the vortex generated in the instability regions of the lubricant fluid film. In the oil film of the thrust bearings operating in high surface speed, there are type I and type II instability. By using powder of barium-sulfate and fluorescent microshpeeres as a tracer, cross section of the oil film flow are observed. As a results, it is clarified that the type I instability is a ring like vortex and type II instability is divided into upper and lower part.
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Yuichi NAKAMURA, Kazuyuki SANDA, Yasushi KUROSAKI
Article type: Article
Pages
159-160
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In obtaining lubricant oils' properties under high pressure for tribo-CAD, a diamond-anvil pressure cell (DAC) was employed. A falling sphere viscometry in the DAC with appropriate heating system enabled the measurements up to 2 GPa at 200℃ for traction oils. Pressure-viscosity coefficient, which is important for EHL analysis and rolling fatigue estimation of machine elements, at 200℃ was 1/3 ∿ 1/4 smaller than that at 40℃. Density (volume) was obtained with DAC and with newly established laser confocal displacement sensor of 0.4μm resolution up to 6 GPa for several oils. Some high-pressure viscosity data are listed in web site homepage as databases, and anyone can access and utilize them for tribo-CAD.
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Toshimitsu NUMATA, Akifumi SAKAMOTO, Atsushi KORENAGA, Yasuhisa ANDO, ...
Article type: Article
Pages
161-162
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes development of a low-load tribo-tester in order to obtain meso-scale mapping of friction force. Sliding experiment was carried out with Al_2O_3 and Diamond slider. The condition of sliding test were 0.5mm/s of sliding speed and 4.9∿9.8mN of load. From the experimental results, we were obtained meso-scale mapping of friction coefficient. Spatial resolution of mapping was dependent on curvature radius of slider surface. In the case of Diamond slider, the spatial resolution was about 10μm.
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Tomoharu Akagaki, Masahiko Kawabata
Article type: Article
Pages
163-164
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In order to measure the dielectric breakdown voltage of the thin oil film, the dynamic electrical wear test machine was designed and developed. It consisted of the rotating steel ring and the steel ball. The gap between the ring and the ball was adjustable at the accuracy of 1μm. With increasing the gap at 50rpm, the dielectric breakdown voltage increased at the rate of about 54V/μm. With increasing the concentration of contaminant or the rotational speed, the dielectric breakdown occurred easily at wider gap or lower voltage.
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Yoshiro IWAI, Yasunori UENO, Tomomi HONDA
Article type: Article
Pages
165-166
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In this paper, we propose slurry jet, a new type of solid particle impact test, in order to quickly evaluate wear properties of physical vapor deposited (PVD) coating drills in commercial use. By slurry jet 1μm alumina particles were impacted at high velocity perpendicular to thin PVD coatings of TiN, TiN/CrN, TiN/TiAlN deposited on a high speed steel (HSS) substrate material. The geometry of the worn surfaces was measured with a stylus profilometer at each test interval. The distance between the original and worn surface at the deepest position was measured and designated as the wear depth. Linear wear was obtained for both coating and substrate material, and the penetration through the coating into the substrate was signified by a sharp increase in slope of the wear versus time curve. In addition our tests were found to be highly reproducible for coating drills. The TiN coating drills proved to have much higher wear resistance than the substrate material. The PVD coatings deposited on the drills showed the same wear rates as those on the plate specimens as reference samples. We conclude that our proposed evaluation technique for coating drills is considerably useful as screening test when evaluating coating tools. For the coatings included in this study, the TiN/TiAlN proved to have the highest wear resistance, whereas the TiN/CrN was the worst.
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Akihiro KANNO, Isami NITTA, Kimio KOMATA
Article type: Article
Pages
167-168
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The shrink fitter have been used to fix the optical lenses accurately into the housing by a shrinkage fit. This is a contact problem between the optical lenses and the shrink fitter. The shrink fitter is carefully turned because the form error may affect the alignment of lenses and deformations of those , and spot diameter is also affected. In order to determine tolerance for the shrink fitter, we examined the effect of alignment of lenses and their deformations on optical performance of scanning lenses fixed by the shrink lenses fixed by the shrink fitter theoretically.
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Akira NAKAJIMA, Toshifumi MAWATARI, Takafumi YOSHIDA, Yasuyoshi TOZAKI ...
Article type: Article
Pages
169-170
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In order to make clear the high speed operating limit or the seizure resistance limit of the ball screw, it is necessary to grasp the actual ball motion in the ball screw, and the development of measuring method of the ball motion has been expected. In the present paper, using a magnetized ball and hall elements arranged on the nut and the return tube, the authors tried to measure the ball motion in the ball screw (ZFT4020) rotating at the shaft speed in the range of 120∿950rpm. The results were compared with the analytical results calculated based on the kinematic geometry of ball screw mechanisms. When the magnetic circuit attached to the measuring system, it became possible to observe the changes in the hall voltage, and the measured values such as the rotational speed of ball revolution and ball rotation almost agreed with the analytical values.
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Hiroshi OKAMURA, Tatsuaki HAYASHIDA
Article type: Article
Pages
171-172
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The synthesis process from the function design to structure design is most important for such new creative development. It is effective to combine the graphical design process, the function designs process and also the structure design process, based on a development concept. The usual prediction technology by forward CAE is poor at a creative process. "Visual Thinking", to help the imagination to new structure/design, and "Thinking CAE", to grasp the essence of new developed structure, are key technology. The construction of the digital engineering environment to digitalize directly the visual information of new image, as virtual reality, becomes needed
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Takumi KAWANO, Tsunemitsu NAKAJIMA, Keishi KAWAMO
Article type: Article
Pages
173-174
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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The Authors present a system supporting easily designing by using an engineering design method mixed with TRIZ and P&B method. Early stages are most important, in the design processes, to develop creative products. The support system is focused on the stages. The system has following functions; reading for design 1) to follow the design processes by our made "guideline", 2) to solve problems by "TRIZ", 3) to draw rough sketches and functional structures by "easy CAD", 4) to evaluate design alternatives by "AHP tool".
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Fumiya Shimizu
Article type: Article
Pages
175-176
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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For the educations of the design and the skill, practice of CAD/CAE software after the employment in a private enterprise, which was consistent, now sufficient time is not taken, under the recent severe conditions. Therefore the importance of the design education in the university is more and more increasing. This paper shows the outlines of two cases of CAE education for the college students. As the first case a lecture in the Nihon university is shown, in which the present status of CAE in the enterprise is introduced, exhaustively. (The experience of the CAE software is also contained.) The second case is a design practice (required subject) in the university of Shiga prefecture in which the CAD/CAE tools are wholly adopted for the past five years.
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Hiroshi HASEGAWA, Hiroshi TORIYA
Article type: Article
Pages
177-178
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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We must structure new environment for aiding engineering based on network computation due to the progress of the network environment of the computer. We propose the concept of W2E (Web Engineering Environment) which is a engineering framework for aiding engineering based on network computation. For this framework we propose the master model WMM (Web Master Model). Its model uses XVL (eXtensible Virtual world description Language) which is a 3D model Web3D in XML (eXtensible Makeup Language). We made possible a solid model, CAE attributes (i.e. Load condition, boundary condition etc) and the expression of CAE result contour by using XVL for WMM. As a result, by using integrated W2E with WMM, we demonstrated that W2E could share easily WMM which gave comment information to the 3D model and the result of CAE between the design section, the analytic section and others section at Web.
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[in Japanese]
Article type: Article
Pages
179-180
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Olga EGOROVA, Junichi SHINODA, Haozhi QU, Ichiro HAGIWARA
Article type: Article
Pages
181-182
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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Initially Characteristic Topology Method (CTM) was proposed for objects topologically the ball to generate quadrilateral meshes on it without self-intersections of dual cycles. The last condition for the surface meshes is necessary for further hexahedral mesh generation according to Hannemann's approach called Dual Cycle Elimination Method. The CTM itself determines three kinds of templates that helt to generate basic dual cycles and satisfy mentioned requirements. The way of template application allows topology different from the ball such as a surface with arbitrary number of holes. This property encourages investigatinng 3D space and solid mesh for complex objects without its decomposition. The coarse and dense parts of the mesh can be defined from nodal structure and generation of additional characteristic dual cycles for each basic dual cycle. The combination of the latter dual cycles for different basic ones provides verity of local mesh structure that one may choose due to demand for further analysis.
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Yasuhiko YOSHIDA, Eijii SHIIBA
Article type: Article
Pages
183-184
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes on a new CAD system for the plastic processing that works on the common data base of CAD, CAM, CAE. We are developing 3D modeling methods that have following distinctive feature. 1) No error on the continuity between the surfaces. 2) Free from disgusting fillet operation. 3) Epoch-making process design function such as the deformation capability on the volume conservation low. 4) Temporary solver that works on common data of CAD/CAM/CAE. We propose there-engineering by the use of New CAD-system.
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Keiko YONEZU, Wataru KUDO, Katsuyuki SAGA, Takahide MIZUNO, Hirobumi S ...
Article type: Article
Pages
185-186
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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In this report the arrangement of devices and cabling of harness in the satellite has been demonstrated on the INDEX satellite. INDEX is a piggy back satellite and it size is 45×46×50cm and the weight is about 67kg. The arrangement and cabling are very difficult in the INDEX, because INDEX has 40 devices and more the 700 cables and the density of it is 30% higher than regular satellite. Especially as far as the author knows, this is the first time in the Japanese development of satellite that made cable and analyzes its influence on a mass property.
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Tomonobu OHYAMA, Masabumi SUZUKI, Tatsuya INABA, Kiyoshi YUYAMA, Hiros ...
Article type: Article
Pages
187-188
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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This paper describes parallel FEM solver for large structural vibration problems of the commercial parallel structural analysis codes ADVentureCluster. The algorithm is based on iterative method with the preconditioner of the CGCG method. We also show examples of large scale eigen analyses and frequency response analyses with ADVENTURECluster.
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Chihiro YAMAMOTO, Ichiro HAGIWARA
Article type: Article
Pages
189-190
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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From the viewpoint of the pedestrian protection and the light collision in the car, it is effective to make deformation quantity large under the small load. In order to increase deformation quantity of axis crash problems, it is important how to make beautifully folded patterns. Therefore, in this research, on the basis of the principle of the origami engineering, several kinds of completely foldable structures were proposed. In addition, the characteristic of the proposed structures were analyzed by using finite element method simulation and optimized by the method of response curved surface method.
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Makoto TANABE, Hiroyuki OKUDA, Hajime WAKUI, Nobuyuki MATSUMOTO
Article type: Article
Pages
191-192
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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A numerical method to obtain an approximated combined dynamic response of unlimited number of Shinkansen cars running on the railway structure is presented. The simulation program, DIASTARS II, has been developed. Based on the method, the combined dynamic behavior of a Shinkansen train connected with unlimited number of cars running on a newly developed floating ladder track at high speed is demonstrated.
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[in Japanese]
Article type: Article
Pages
193-194
Published: September 20, 2002
Released on J-STAGE: August 01, 2017
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