JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry
Print ISSN : 0914-8825
Volume 32 , Issue 3
Showing 1-23 articles out of 23 articles from the selected issue
  • Akihiro TANAKA
    1989 Volume 32 Issue 3 Pages 349-355
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Research and development of gas seals conducted in the Stirling engine program by AIST of MITI are reviewed. Gas leakage to a pressurized space can be regarded as a viscous flow. The friction and wear of the seal materials are variously affected by the mating surface roughness and the mating materials. As an example of internal seals, the piston ring system composed of 3-stage seal rings is presented; the performance of the system is excellent. The efficacy of the "lubrication ring" in increasing the life of the piston ring is shown. As an external seal, the rod seal system lubricated by oil exhibits good performance. The characteristics of the mechanical seal with spiral groove are presented.
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  • Akira YOSHIDA
    1989 Volume 32 Issue 3 Pages 356-364
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Surface-hadened gears are employed as the power transmission elements in many recent machines. The design for tooth surface durability of surface-hardened gears is empirically performed using the relation between tooth surface hardness and Hertzian stress for both pitting and spalling failures. However, the dominant mode of the tooth surface failures in surface-hardened gears is spalling, whose failure mechanism is different from that of pitting failure. For this spalling failure, neither a guide for the establishment of a designing method nor a design formula has yet been give. In this paper, the recent fundamental works on spalling in surface-hardened gears carried out mainly at Okayama University are reviewed, and simple equations for estimating the spalling fatigue life and strength, and a general design guide for the spalling strength considering the spalling failure mechanism are introduced. Some problems for future investigation are also pointed out.
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  • Kimihiko YASUDA, Shozo KAWAMURA
    1989 Volume 32 Issue 3 Pages 365-372
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    A new technique for identifying nonlinear systems is proposed. The basic procedures of this technique include (1) dividing the regions of displacement and/or velocity into small subdomains, and expressing the restoring force or damping force in a piecewise manner over each subdomain, (2) gathering dynamical data of a periodic external force applied to the system as well as those of periodic oscillations induced by it and (3) applying the principle of harmonic balance. To evaluate the applicability of the proposed technique, we applied it to some typical nonlinear systems with smooth nonlinearity as well as nonsmooth nonlinearity. In application of the technique, the dynamical data are generated numerically from the equation of motion of these systems. It has been shown that the proposed technique identifies the systems very well.
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  • Hidekazu NISHIMURA, Kazuo YOSHIDA, Taro SHIMOGO
    1989 Volume 32 Issue 3 Pages 373-379
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    This study deals with the optimization problem of a dynamic vibration absorber (DVA) for multi-degree-of-freedom systems subjected to random input with a dominant frequency. A new design method, which optimizes the parameter of DVA composed of such passive elements as a spring and a damper, is proposed. In this method, a suboptimization method based on the optimal control theory is applied for the optimization problem with control structure constraints due to passive elements. This method can consider the input information and the constraints on the stroke of DVAs. The vibration control performance of this method is investigated and is compared with the previous method, in numerical calculations. As a result, the usefulness of the present method is verified.
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  • Masumi KATAOKA, Takanao SUGIMOTO, Shinichi OHNO
    1989 Volume 32 Issue 3 Pages 380-384
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    In this paper, a method is proposed to correct the boundary conditions in the calculation of natural frequencies of the bending vibration of an axially compressed bar that is compressed by the flat anvil of the testing machine at its rounded end. In this method it is assumed that when the axial load is small, the boundary condition can be approximated by the simple support since the contact area is small, and that when the load is increased, the boundary condition approaches the fixed support since the contact area increases due to elastic deformation. The result of calculation for a bar that is fixed at one end and is in contact with the anvil at the other rounded end shows good agreement with that of the experiment.
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  • Atsuo SUEOKA, Takahiro KONDOU, Tohru TANAKA
    1989 Volume 32 Issue 3 Pages 385-393
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Chain has large weight and high tension stiffness; these distinctive features are different from those of string. This paper describes the nonlinear harmonic and parametric resonances of a roller chain stretched horizontally, which is regarded as a system with many degrees of freedom, when the elongation of the chain during vibration is taken into account. The resonance treated in this report is one of the resonances excited by combined forcing and parametric excitations in which the ratio of the frequency of the forced lateral displacement acting at the left end to that of the tension fluctuation is 1:2. The vibration characteristic are computed for three kinds of chain and are compared with the ones obtained from the experiments. In particular, the effect of the chain weight upon the resulting vibrations is considered. Good agreement between experimental and analytical results is confirmed.
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  • Hiroshi YAMAURA, Kyosuke ONO
    1989 Volume 32 Issue 3 Pages 394-399
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    A numerical analysis method is developed for the nonlinear bending vibration of a flexible arm which is accelerated to high rotational velocity in a range of the lowest bending vibration period. The derivation of the differential equation of motion and its finite element formulation is carried out for the moving flexible arm, including the nonlinear effect of a center shaft velocity. The time responses of bending vibration of the flexible arm in a rapid access process are numerically calculated and the critical rotational velocity to induce nonlinear behavior is discussed. From the experimental study it is found that the theoretical results agree well with the experimental ones if three nonlinear terms and the external damping term of the surrounding air are taken into account.
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  • Weiming ZHANG, Hiroshi MATSUHISA, Yoshihisa HONDA, Susumu SATO
    1989 Volume 32 Issue 3 Pages 400-405
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    In this paper, the optimal tuning of the natural frequency and the optimal damping parameter of a cantilever-type dynamic vibration absorber attached to a railway wheel are derived. An index, the equivalent mass ratio, with which the effectiveness of absorbers can be estimated and evaluated easily, is defined. It is found that the cantilever-type absorber can be more effective than the conventional mass-spring absorber. When N absorbers are attached to a wheel and N/2 is different form the number of nodal diameters, the effectiveness of the vibration reduction does not decrease, even though the wheel is rotating.
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  • Mikio NAKAI, Masayuki YOKOI, Masanori SUGIURA
    1989 Volume 32 Issue 3 Pages 406-412
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    A steel rod was rubbed against the circumference of a thin steel rotating disk in its axial direction. A rotating disk serving as a railway wheel was clamped at the inner radius and free at the outer radius. A squeal occurred at low rotational speeds, when a nodal diameter mode of the disk was stationary in the space-fixed coordinated system. At relatively high rotational speeds, a squeal with a forward or a backward traveling wave was generated. Either of the two waves may occur depending on the vibration of the steel rod. Analytical responses of the rotating disk in both the disk-fixed and the space-fixed coordinate systems agreed with the experimental ones.
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  • Hiroshi YAMAURA, Kyosuke ONO
    1989 Volume 32 Issue 3 Pages 413-420
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    An efficient vibrationless starting and stopping control method for a multidegrees-of-vibration-freedom flexible mechanical system is proposed. The procedure used to derive an optimal vibrationless motion and input force are generally formulated using the modal equations of motion for a multidegrees-of-vibration-freedom flexible mechanical system. Combined control of control point velocity tracking feedback together with the vibrationless feedforward input is described. Then this method is applied to the starting and stopping control for a rotational flexible arm positioning system. It is shown from the experiment that transient vibrations can be suppressed well using the combined control of collocation velocity tracking feedback and vibrationless feedforward input.
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  • Hajime SUGIUCHI, Kenichi YOSHIMOTO
    1989 Volume 32 Issue 3 Pages 421-427
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Industrial robots are being used predominantly today for various purposes. By reducing the mass of the links of a robot, it is possible to improve its working speed and efficiency. Reduction in link mass, however, results in a lowering of stiffness, which causes problems such as a lack of precision in positioning due to the elastic deformation caused by gravity, or elastic vibrations. In this paper, it is shown that a smooth trajectory effectively reduces the elastic vibrations of a flexible manipulator. A preview control system presented previously is extended to a multiinput / multioutput case and is applied to the flexible manipulator to illustrate high tracking precision. Finally, the two schemes are combined to achieve precise tracking and good damping simultaneously.
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  • HIroshi YABUNO, Takehisa SEINO, Masatsugu YOSHIZAWA, Yasushi TSUJIOKA
    1989 Volume 32 Issue 3 Pages 428-435
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Nonlinear oscillations of a levitated body, which is moved in a horizontal plane and is guided by magnetic forces on both sides, are examined theoretically and experimentally. The magnetic forces acting on the body are calculated exactly by applying Coulomb's law over an infinitely small area of magnets, and by integrating about four magnetic poles of two magnetic plates. The parametrically excited oscillations of the body, due to the relative vertical motion between the body and the magnetic guides, are studied theoretically by using the above magnetic forces. The experiments are performed with a simple experimental apparatus. As a main result, the oscillation with a fractional-harmonic pair, as predicted by the theory, is shown experimentally in the special case when two natural frequencies of the body are nearly commensurable.
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  • Hiroshi SHIMOJIMA, Osamu SATOH, Masayuki KUWABARA
    1989 Volume 32 Issue 3 Pages 436-441
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Adjustable mechanisms with multiple-degree of freedom, whose adjustable inputs are part of redundant inputs which do not play a role in describing their output motion, can optimize characteristics other than the output motion, such as the size and shape of mechanism, operating time, and energy consumption of the actuator. In this paper, the above adjustable mechanisms are studied from the standpoints of both hardware and software, and the characteristics for application to path generators are clarified. Number and dimensional syntheses are carried out in section 1, with consideration given to such kinematic and kinetic characteristics as working space, input torques and joint forces under unit load.
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  • Akira ISHIBASHI, Satoru MUTA, Shigeru HOYASHITA
    1989 Volume 32 Issue 3 Pages 442-447
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    Earlier equations used to calculate the positions of the release ports of gear pumps were derived without considering changes in running conditions which are apt to occur in field applications. Therefore, gear pumps designed using these equations gave lower efficiencies in some, or most, running conditions. With the support of the theory, the authors found new release ports suitable for the gear pumps to be operated under various running conditions. Experiments were conducted using two helical gear pumps with conventional and new release ports. The pump with the new release ports brought about larger deliveries and also higher efficiencies. The reason for this is explained by the theoretical characteristics of the gear pumps.
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  • Katsumi INOUE, Toshiyuki MAEHARA, Masashi YAMANAKA, Masana KATO
    1989 Volume 32 Issue 3 Pages 448-454
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    The quantitative effects of hardness and residual stress produced by shot peening on the bending strength of carburized spur gears of m=5 are investigated. The residual stress of every test tooth is measured by an X-ray diffraction method. The intensity of shot peening has little effect on the fatigue strength. The mean strength is about 1200 MPa, which is about 1.3 times that of carburized gears without shot peening. When a tooth surface is electropolished and a higher compressive residual stress is applied to the fillet, the fatigue strength is still 250 MPa higher than that of the shot-peened gears. In this study, the improvement of fatigue strength is assumed to be caused by an increase of both hardness and residual stress, and an experimental formula is proposed to estimate the fatigue strength.
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  • Satoshi ODA, Takao KOIDE, Mitsuji MATSUI, Yuzuru YAMAMOTO
    1989 Volume 32 Issue 3 Pages 455-459
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    This paper presents a study on the effect of intergranular oxidation on the bending fatigue strength of case-hardened gears. The test gears were case-hardened by gas-carburizing and vacuum-carburizing methods, and the degree of intergranular oxidation and the grain size of these gears were examined. Bending fatigue tests for these gears were carried out, and the effects of intergranular oxidation on the bending fatigue strength of case-hardened gears were clarified. Furthermore, various mechanical surface treatments (shot peening, shot blasting, etc.) were performed on these gears, and the effect of these surface treatments on the bending fatigue strength after case-hardening was investigated by carrying out bending fatigue tests.
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  • Yoshio TERAUCHI, Toshiji NONISHI
    1989 Volume 32 Issue 3 Pages 460-466
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    In the previous paper, the authors investigated the fluctuation of oil film pressure and the vibration of cylinders caused by a periodic change in the width of the contact surface. The calculated results were obtained by solving a Reynolds equation and an equation of the cylinder motion simultaneously, on the condition that the load on the cylinder is so low that the elastic deformation is negligible. In this paper, the effect of the contact-surface-width variation on the elastohydrodynamic line contact has been studied by solving the above-mentioned equations with a formula of elastic deformation and with a formula of the pressure dependence of viscosity. One of these calculated results indicates that, under the condition of elastohydrodynamic lubrication, the oil film shape is changed with time similar to wave motions.
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  • Yoshio TERAUCHI, Kazuteru NAGAMURA, Chang-Lin WU
    1989 Volume 32 Issue 3 Pages 467-474
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    The heat transfer coefficient on tooth faces must be known when calculating temperature rise on tooth faces. Though analytical fling-off cooling of gear teeth and experimental results about the adhesive amount of oil have been already reported, there have been few reports about heat transfer coefficients on tooth faces based on experiments and calculated from actual conditions. In this paper, the temperatures of the tooth faces and of the oil were measured, so the heat transfer coefficient was evaluated based on the temperature difference between the tooth face and the oil. The heat transfer coefficient concerning two conditions was evaluated analytically.
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  • Taku UENO, Mitsuru YANO, Sigeru INOUE, Masahito GOKA
    1989 Volume 32 Issue 3 Pages 475-479
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    This paper discusses the hobbing of gears made of austempered ductile iron (spheroidal graphite iron), which has recently, become the object of attention as a new material for gears. This iron has many advantages, such as a high strength equivalent to steels, and is an economical material. The cutting of teeth of a hardened gear blank is considered to be very difficult, yet if it be possible, the production cost will be lower because the gear can be used without a finishing operation on the tooth surface, removing the distortion caused by the heat treatments. In cutting tests, at first a basic test was conducted using a fly-tool of the same form as that of one blade of a hob. As a result, it was found that hobbing can be performed by using a tool with a large clearance angle (20°).
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  • Can COGUN
    1989 Volume 32 Issue 3 Pages 480-483
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    This paper summarizes experimental investigations on the effect of discharge power on discharge profile in Electric Discharge Machining (EDM). Discharge power is changed between 95 W and 310 W, and variations in time-lag durations of discharges, occurrence of open and short circuit pulses (inactive pulses), actual machining time and successive occurrence of discharges are investigated.
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  • Tamotsu NAKAMURA, Hideyuki KINPARA
    1989 Volume 32 Issue 3 Pages 484-490
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    An extrusion-type friction test and a forced sliding test have been carried out to examine the critical conditions for seizure initiation in different tool surface roughnesses using a commercially pure aluminium as a word-metal. The thinner the applied lubricant oil film thickness, the earlier the seizure occurred in every tool surface roughness. However, the critical punch stroke for seizure initiation decreased significantly with the increase of the tool surface roughness. The oil film thickness trapped in the tool-work interface was measured experimentally and estimated theoretically. As a result, it has been clarified that the critical oil film thickness for seizure initiation increases with the increase of the tool surface roughness.
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  • Hideaki YAMASHITA, Kouichiro NAKAZAWA, Hirofumi NAGASUKA, Shigemichi S ...
    1989 Volume 32 Issue 3 Pages 491-497
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    We shall consider a production line which is operated according to demand for products so as to minimize product shortages and excesses of inventory. In our model, the capacities of buffer storages and a warehouse are adjusted according to demand, and the blocking of each stage plays an essential role in reducing unnecessary inventories. The efficiency of the line is measured by the sum of the average shortage of products and the average inventory of in-process and finished products in the steady state. We propose two efficient approximate solution methods evaluating the line efficiency in terms of configuration parameters. Of these two methods, the second method requires more tedious calculations, but is more accurate. We confirm the validity of the approaches by comparing the solutions for many example problems obtained by our methods with those obtained by computer simulation.
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  • Kenji YURA
    1989 Volume 32 Issue 3 Pages 498-503
    Published: September 15, 1989
    Released: February 18, 2008
    JOURNALS FREE ACCESS
    A multi-job cyclic scheduling problem for an automated job-shop-type manufacturing system was analyzed. In the cyclic scheduling problem, an optimum schedule is a non-idle schedule, where a bottleneck machine produces jobs without idle time in the steady state. A dividing method of the jobs was introduced and the job output interval in the steady state was clarified. A lower bound on the buffer capacity was obtained to construct a non-idle schedule.
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