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Volume 53, Issue 494
Displaying 1-16 of 16 articles from this issue
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Takashi SAITO, Mitsuru ENDO1987 Volume 53 Issue 494 Pages 2073-2080
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe basic equations for a thick rotating cylindrical shell, including the effects of the initial tensions and resultant shear stress due to rotation, are derived by the Timoshenko type shell theory. By the modified Galerkin's method, frequency analyses are presented for three kinds of boundary conditons (i. e., both ends (A) clamped, (B) simply supported without axial constraint, and (C) simply supported with axial constraint) . Numerical results are compared with those based on Flugge type shell theory and the difference between both theories is examined.View full abstractDownload PDF (699K) -
Fumio NAGASHIMA, Eiji HASEGAWA1987 Volume 53 Issue 494 Pages 2081-2087
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe stability of the free surface of a viscous liquid layer with a horizontally infinite extent under a vertical oscillation is investigated theoretically using linear perturbation theory. In this paper, the vertical oscillation is assumed to be sinusoidal. In the case that the liquid layer consists of a perfect fluid, this problem is reduced to Mathieu's equation. In regard to a viscous fluid, the approximate solutions of the given wave numbers are found analytically in the case of 1/2 subharmonic and harmonic resonance, and the stability boundaries for various wave numbers, i.e. the neutral stability curves, are obtained in the frequency-amplitude plane. It is found from these neutral stability curves that 1/2 subharmonic resonance arises within most of the parameter ranges, but harmonic resonance does so only in the case of a thin liquid layer.View full abstractDownload PDF (531K) -
Takenori MORIMITSU, Hideaki SAKATA1987 Volume 53 Issue 494 Pages 2088-2093
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper proposes a new vehicle that moves inside small pipes with inner diameters of less than 100 mm in order to maintain and inspect them. The vehicle is surrounded by bristles vibrated by centrifugal force provided by rotating eccentric weights. Since this method does not require wheels or reduction gears, there is a good potential for miniaturization. First, the sliding velocity of each bristle and its friction are discussed. Then, moving simulations and experiments are conducted using a vehicle with 16 bristles in order to clarify the relationship between the moving velocity of the vehicle and the angular velocity of the rotating eccentric weights. It is shown that the vehicle moves smoothly inside a small pipe. The calculated moving velocity agrees with the experimental results.View full abstractDownload PDF (672K) -
Keiji YOKOSE, Yutaka TAKANO, Mitsuo IGARASHI1987 Volume 53 Issue 494 Pages 2094-2102
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this paper, the authors theoretically analyze the forced hunting of a bogie truck model composed of at least a six degrees of freedom system when a truck with elastically suspended axles, such as a SHINKANSEN truck, runs on a rail with sinusoidal irregularity in regard to the lateral direction of the track. As an analytical result, various optimum values, for example the supporting stiffness of the axles, the turning stiffness of the truck and the wheel tread conicity etc., for avoiding the resonant-state of the truck due to rail irregularity are revealed. It is also clear that installing a damper against truck turning is an effective method for preventing forced hunting due to rail irregularity. Target values for designing high speed vehicles are proposed.View full abstractDownload PDF (929K) -
Isao OKAMOTO, Shiroh KOYANAGI, Hiroshi HIGAKI, Katsuyuki TERADA, Kenji ...1987 Volume 53 Issue 494 Pages 2103-2109
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSFor the purpose of improving the ride quality, an actively controlled suspension system for railroad passenger cars has been developed using pneumatic servo elements. On each truck, two pneumatic cylinders are mounted parallel to the conventional air springs and a lateral hydraulic damper. The signals from lateral accelerometers set on the car body floor are finally fed into pneumatic servo valves after the gain and phase are moderately compensated. In 1984, running tests with the series 485 limited express electric cars incorporated with this system were performed on the Touhoku Line. The lateral vibrational accelerations were reduced by the active control. The effect on reducing the vibrations was approximately 50% on average.View full abstractDownload PDF (742K) -
Hiroshi FUJIMOTO, Masayuki MIYAMOTO1987 Volume 53 Issue 494 Pages 2110-2114
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSFrom the vibration data collected on the Shinkansen, it is recognized that the vibration amplitude of the tail car is greater than that of the other cars in a train. although the tail car is identical with the head car. In order to analyse the reason. we have investigated whether or not the greater vibration of the tail car comes from the hunting characteristics of a "coupled train". First, the stability of cat body hunting motion and the vibration modes were calculated. Next, for the purpose of evaluating how the hunting characteristics were reflected in a vibration response to track irregularity, the vibration responses in a "coupled train were calculated. The result shows that one reason for the greater vibration of the tail car might be in the vibration modes of hunting motion in a "coupled train ".View full abstractDownload PDF (567K) -
Tsutomu NOHARA, Chuzou NINAGAWA1987 Volume 53 Issue 494 Pages 2115-2120
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSSince household appliances in recent years have been able to use inverters, an inverter driven air conditioner aiming at economical and comfortable air conditioning has appeared. Along with this, the development of a new controller unlike conventional ones, has become necessary. We have consequently studied a computer aided simulation technology for dynamic characteristics of air conditioners. The model of dynamic characteristics of air conditioners was divided into a refrigerating system and an air conditioning system. The statistical mathematic model was utilized for the former, while the physical model based on thermodynamics was realized for the latter. A Simulation using these models was performed. After the adequacy of the models was confirmed by experimental comparison, it was applied to evaluate the various parameters of the controller and to consider a new control algorithm. Simulation technology is thus an effective step for determining the control specifications.View full abstractDownload PDF (649K) -
Ikuya FUJISHIRO, Yuichi NAKAMURA, Takeshi KAWASE, Bin OKAI1987 Volume 53 Issue 494 Pages 2121-2126
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSA ruby pressure sensor, detecting hydrostatic pressure (up to 100 GPa) by the shift of ruby R* R2 fluorescence wavelength, is compressed by uniaxial stress generated by diamond anvils with a lever-type loading apparatus. Two ruby plates, each having (112^-0) and (0001) crystal planes, are loaded in order to investigate the anisotropic sensitivity. The sensitivities for pure uniaxial stress are obtained from the experimental data and FEM stress analysis of the ruby. Obtained sensitivities for (112^-0) and for (0001) crystal planes are 0.141 7±0.002 0 nm/GPa and 0.077 9±0.003 2 nm/GPa respectively in the R1 fluorescence line. These values are indispensable in studying the stress field of a pressure chamber and the utility of the ruby sensor will be enlarged.View full abstractDownload PDF (743K) -
Yoichiro HARA, Yukitaka KURAKAKE, Hideyuki TAMURA, Atuo SUEOKA, Satoru ...1987 Volume 53 Issue 494 Pages 2127-2134
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe quasi-static vibratory analysis of a rotor supported by cylindrical roller bearings is presented. The system is an ideal cylindrical roller bearing in which the inner ring moves in a radial plane with two degrees of freedom under a constant radial load. The load/deformation relation for an elastic contact is expressed by the function with an arbitrary power index, and the motion of the inner ring center due to roller revolution is analyzed in detail. The case in which the spring is a one-sided linear is also analyzed. The results show that the inner ring motion has complicated features, and changes drastically with the design and operating conditions. All computed results are arranged in charts in which approximate wave forms of the inner ring motion and its magnitudes, and the loaded states of rollers are presented. They may be used in the design process to examine the rigidity, the critical speed, and the vibratory nature of a rotor system.View full abstractDownload PDF (801K) -
Keiichi WATANUKI, Hideyuki OTAKI, Yoshio ISHIKAWA1987 Volume 53 Issue 494 Pages 2135-2142
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe importance of system design in the field of mechanical engineering has been increasingly recognized recently. But suitable and useful methods for machine design are not yet established. So we must derive easy and useful designing methods for each machine element. In the previous report, we derived a new designing method by linear graph theory and analyzed the results of the dynamic behaviour of a power transmission mechanism as an example. In the report, we understand that the mechanisms which are subject to restrictions of high accuracy and high performance must be designed by considering the characteristic of each machine element. This report deals with a more general power transmission mechanism containing a motor, bearing, support and so on, and analyzes the results of dynamic behaviour. Provided that the analytical model and system graph as in this report are prepared for the mechanism, the performance of the mechanism is easily grasped by this method.View full abstractDownload PDF (704K) -
Satoshi ODA, Takao KOIDE, Kouitsu MIYACHIKA, Junichi YOKOYAMA1987 Volume 53 Issue 494 Pages 2143-2148
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper presents a study on the dynamic behavior of helical gears of full depth and long teeth with various standard pressure and helix angles. Natural frequencies of flexural vibration of gear body were measured and compared with the results calculated by Mindlin's method. The relations between these natural frequencies and spectra of circumferential, radial, and axial vibrations were investigated. The circumferential, radial, and axial vibration accelerations, and the root stresses were measured under different running conditions by using a gear testing machine of the power absorbing type. On the basis of these results, the effects of pressure angle, helix angle, and whole tooth depth on the vibrations and dynamic load of helical gears were clarified to a considerable extent.View full abstractDownload PDF (675K) -
Satoshi ODA, Takao KOIDE, Yasuhiro SAWA1987 Volume 53 Issue 494 Pages 2149-2154
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper presents a study on the effect of standard pressure angle on the bending fatigue strength of helical gears. The root stresses of meshing helical gears of various pressure angles, helix angles and whole tooth depths were calculated by using the approximate equations for deflection and bending moment due to a concentrated load on gear teeth of full depth and long teeth with various pressure angles and Kubo and Umezawa's method. Bending fatigue tests were performed on helical gears of full depth teeth of various pressure angles and helix angles. On the basis of these results, the effects of pressure angle, helix angle and whole tooth depth on the root stresses and bending fatigue strength of helical gears were clarified to a considerable extent.View full abstractDownload PDF (618K) -
Nobuyoshi KAWABATA1987 Volume 53 Issue 494 Pages 2155-2160
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSA new method of the direct numerical calculation for the fluid film lubrication problem is presented in this paper. The present method is derived by applying the boundary fitted coordinates system to the divergence formulation (DF) method. It is made possible by the present method to deal with an arbitrary configuration of lubricated surface, so a disadvantage of DF method compared with the finite element method was solved. The present method has the following advantages : (1) An arbitrary configuration of lubricated surface can be calculated. (2) A programing is easy. (3) A scale of program and cpu time are small, so the calculation by a personal computer is possible.View full abstractDownload PDF (640K) -
Yasushi KUROSAKI, Masanobu MATSUMOTO, Masanori KOBAYASHI1987 Volume 53 Issue 494 Pages 2161-2166
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSBased on Bassani yield criterion, a computer simulation of axi-symmetrical pure stretch-forming is attempted. A method for estimating the coefficient of friction necessary for the calculation is presented by extending Hill's method. The results calculated for four kinds of metal sheets are compared with the experimental data. The strain distribution and the farcture position are found to be sensitive to the shape of the yield locus, that is, anisotropic yielding, and it is concluded that the Bassani criterion is much more useful for the simulation than Hill's old criterion.View full abstractDownload PDF (690K) -
Yasuhiro IWASAKI, Tsutom OOE, Yoshinori YUZAKI1987 Volume 53 Issue 494 Pages 2167-2171
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSSpirally wound layered vessels are a type of multi-layered vessel used as high pressure vessels in chemical plants, etc., and consist of an internal shell around which hoop steel is wound spirally in layers. Stable, automatic winding and high-speed welding of hoop steel are major considerations to ensure efficient production of high-quality spirally wound layered vessels. For these purposes, the hoop steel must be wound with a uniform gap between the hoop steel and minimum clearances between the layers. In order to develop winding equipment which will meet these requirements, tests were carried out to determine which parameters should be controlled and by what method. As a result, it was found that if hoop steel is controlled at a proper angle, both the gap between the hoop steel and the clearances between the layers will be within the target values and the ASME requirements.View full abstractDownload PDF (612K) -
Teruo SUNAGA, Mohammed Abdul MAZEED, Eiji KONDO, Takanori KIYOTA1987 Volume 53 Issue 494 Pages 2172-2176
Published: October 25, 1987
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe aim of this paper is to provide a mathematical model for interactive decision making problems under multiple objectives, where the information about the decision maker's preferences is expressed in the form of aspiration levels. It is shown that the proposed mathematical model can be used not only for satisficing decision making but also for Pareto optimization ; this model is equally applicable to Single Criterion Decision Making (SCDM) problems. For the optimization of the mathematical model, Box's Complex Search (a derivative free method) with some simple modifications is proposed. Finally, a metal cutting problem is formulated and solved.View full abstractDownload PDF (533K)
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