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Katsuyoshi SUZUKI, Yasushi MIYASHITA, Tadashi KOSAWADA, Shin TAKAHASHI
1984 Volume 50 Issue 458 Pages
1767-1773
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Mikio NAKAI, Yukihiko KITANO
1984 Volume 50 Issue 458 Pages
1774-1782
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Naoyuki TANAKA, Yozo NAKAMURA, Mitsuru FUJIWARA, Tetsuzo MATSUNAGA
1984 Volume 50 Issue 458 Pages
1783-1789
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Kyosuke ONO
1984 Volume 50 Issue 458 Pages
1790-1798
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Teruo IGARASHI, Toyoka AIMOTO
1984 Volume 50 Issue 458 Pages
1799-1806
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Hideto MURATA, Masaharu HASHIMOTO
1984 Volume 50 Issue 458 Pages
1807-1815
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Shuzo ITOH, Yoshimi ITO, Tsutomu SAITO
1984 Volume 50 Issue 458 Pages
1816-1824
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Naohisa TSUKAMOTO, Jiasun SHI
1984 Volume 50 Issue 458 Pages
1825-1833
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Masahiko TAKESUE, Hisao YAMADA, Taku UENO
1984 Volume 50 Issue 458 Pages
1834-1841
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Minoru MAKI, Takao SAKAI, Eiji MOCHIZUKI, Hiroshi GUNBARA
1984 Volume 50 Issue 458 Pages
1842-1848
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Keijin SATO, Osamu KAMADA, Sumio YAMAMOTO, Nobuo TAKATSU
1984 Volume 50 Issue 458 Pages
1849-1856
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Chotaro NARUSE, Shoji HAIZUKA, Ryozo NEMOTO, Masatoshi YOSHIZAKI
1984 Volume 50 Issue 458 Pages
1857-1866
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Aizoh KUBO, Takeshi FUJITSU, Shigeru KUNISHIMA, Tastumi ONAKA
1984 Volume 50 Issue 458 Pages
1867-1873
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Shigeyuki SHIMACHI, Takao SAKAI, Takashi EMURA, Takashi KIKUCHI
1984 Volume 50 Issue 458 Pages
1874-1880
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Shigeyuki SHIMACHI, Takao SAKAI, Takashi EMURA
1984 Volume 50 Issue 458 Pages
1881-1886
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Kenji CHIJIIWA, Yotaro HATAMURA, Takesi YONEYAMA
1984 Volume 50 Issue 458 Pages
1887-1895
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Toshio SUZUKI, Seizo KONDO, Taku UENO
1984 Volume 50 Issue 458 Pages
1896-1905
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Hideo FUJIMOTO, Srizo FUJII, Takeshi SUZUKI
1984 Volume 50 Issue 458 Pages
1906-1913
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Osamu KOHG, Fumio HARA
1984 Volume 50 Issue 458 Pages
1914-1920
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This paper deals with a theoretical analysis of damping ratio for a vibrating circular rod in a two-phase air-water bubbly fluid, showing a good agreement between both theoretical and experimental results. The two-phase fluid model presented here assumes the liquid-phase medium be incompressible, containing a circular rod, and mass- and rigidity less circular "air columns". In the analysis for motions of these circular columns in the liquid, damping matrix is assumed to be diagonal, and the damping ratio is evaluated. The theoretical values are compared with the experimental ones, giving a good agreement.
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Motohiro SHIGA
1984 Volume 50 Issue 458 Pages
1921-1929
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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To avoid resonance of steam turbine blades during operation, it is necessary that the prediction method for natural frequencies of blades is established. Therefore, the calculation method of the natural frequencies was developed for the structure in which blades on the entire disk circumference was binded. It was found that five natural frequencies was existed within the range below 500 Hz in calculations of natural frequencies of a single blade for a turbine. Noticing the vibration of the direction in which moment of inertia is small at the middle between blade root and blade tip, we can show systematically vibration characteristics for these natural frequencies. Besides, the relation between the natural frequencies of the all banded blades and that of a banded group of several blades and variation of the natural frequency to vary blade dimension are also discussed.
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Seiichi MICHIMURA, Akiyoshi TAMURA
1984 Volume 50 Issue 458 Pages
1930-1938
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This paper is concerned with coupled vibration between flexible bladed disks and flexible shafts in the application of the Finite Element Method. since a bladed disk is considered as a periodically symmetric structure, it is enough to analyze one periodic substructure of a bladed disk by the use of the Cyclic Symmetry Method. In this paper, it is assumed that only one nodal point at the center of a bladed disk is connected with one nodal point of a shaft. The followings are known through this study. (i) Natural modes of zero nodal diameters generated on a bladed disk are coupled with longitudinal and torsional vibration of a shaft. (ii) Natural modes of one nodal diameter generated on it are coupled with only lateral vibration of a shaft. (iii) Natural modes of more than two nodal diameters generated on it are uncoupled with vibration of a shaft completely.
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Noriaki HAGIWARA, Teruo SUZUYAMA, Hiroshi ISHI, Takashi KOHNO
1984 Volume 50 Issue 458 Pages
1939-1947
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This paper reports influence of differences in natural frequencies and damping of axial fan on resonant amplitudes of engine orders. The analytical results can deduce several following new characteristics of blade vibration. (1) Each blades can not vibrate by itself, but influence each other through a hub element. The stiffness of hub does not make much difference in the coupled vibration effect. (2) The maximum amplitudes of engine order resonances are influenced more sensitively by differences of blade natural frequencies than by those of damping. (3) The distribution of differences in blade natural frequency does not change significantly the maximum amplitude at engine order resonance. (4) The maximum amplitude ratio can not be over about 1.5 in comparison with the case of uniform blades, even if considering any difference of natural frequencies.
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Yoshihiro TSUDA, Junkichi INOUE, Hideyuki TAMURA, Atsuo SUEOKA, Takahi ...
1984 Volume 50 Issue 458 Pages
1948-1954
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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The 1/2-th sub-harmonic oscillations of a system with a Duffing type restoring characteristic are investigated by making use of a harmonic balance method, under the condition that both the periodic exciting force (e, g., an unbalancing force) and the constant force (e.g., gravity) are operative. In contrast with the preceding paper
(1), the restoring characteristic of this system is assumed to be a soft spring. As a result, the phenomena of these vibrations are considerably complicated and also extremely different from the same kind of vibrations in the hard spring system
(1). However, the occurrence of the 1/2-th sub-harmonic vibrations in this system is possible similar to the hard spring system, even if the constant stimulating force approaches zero.
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Yoshiaki IWATA, Yohji OKADA
1984 Volume 50 Issue 458 Pages
1955-1961
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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The optimum vibration control of multi-dimensional vibration system as in the case of a transportation vehicle is considered impossible if the control makes use of only passive elements like a spring and damper. This paper proposes a scheme to materialize an optimum vibration isolation system by the employment of active elements which control the pneumatic pressure of the air springs. The design principle is to calculate the optimum feedback transfer functions minimizing the accelerations of vertical, rolling and pitching mode within the predetermined stroke of the air springs when the system is given the stationery random vibration. some experimental results are given following this principle.
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Kazuto SETO, Kouichi IWANAMI, Yoshihiro TAKITA
1984 Volume 50 Issue 458 Pages
1962-1969
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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In order to control the mechanical vibration of multi-degree of freedom system, this paper proposes the practical application of dynamic absorbers and a new approach for these design. It is widely known that the design method for a dynamic absorber to one degree of freedom system has already been established. However, there still remains a problem how to constitute suitably the dynamic absorbers to the multi-degree of freedom system. The principal point of the design method proposed here is in exactly estimating equivalent masses and these locations on the each vibration mode, after decoupling the vibration system in modal domain. The locations are selected as the settling point of dynamic absorbers, and the masses are used as an essential design parameter. The effectiveness of the design method is demonstrated by controlling the undamped vibration of a three degree of freedom system using three dynamic absorbers.
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Kazuto SETO
1984 Volume 50 Issue 458 Pages
1970-1977
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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To confirm the availability of the design method for dynamic absorbers to the miltidegree of freedom systems proposed in 1st report, this paper shows that the first three resonances of a cantilever beam structure with negligible internal damping are suppressed effectively by three dynamic absorbers which are designed by using the method. First, the suitable locations to install each dynamic absorber and the equivalent masses at these locations are estimated by appling the transfer matrix method. After forming a complex transfer matrix for the dynamic absorber, the complex transfer matrix method to calculate the frequency response of the beam structure with three dynamic absorbers is shown. by means of both theoretical and experimental analysis, finally, it is found that the use of dynamic absorbers has great potential value in reducing the resonant vibration of such beamlike structure.
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Yoshiaki ARAKI, Yasunori YUHKI, Isao YOKOMICHI, Yasusuke JINNOUCHI
1984 Volume 50 Issue 458 Pages
1978-1984
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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The new type of impact damper consists of a bed of granular materials moving in a container fixed to the primary vibrating system. The problem is to determine the characteristics of the impact damper for reducing the vibration of the system to a prescrived value. This report treats with the indicial response of the damper i.e. the damping characteristics of free oscillations from initial displacement of the vertical and the horizontal vibrating system. Experimental models were tested and numerical analyses were developed to find the damping characteristics for several values of mass ratio and clearance. Results from numerical analyses agreed favorably with experimental tests.
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Takeshi FUJIKAWA, Etsujiro IMANISHI
1984 Volume 50 Issue 458 Pages
1985-1994
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This paper proposes a method to estimate the magnitude of the error caused by the approximation of the substructure synthesis method for the time history analysis where coupling effects are treated as constant during each time step, and examines the accuracy through calculations for several linear vibration modes, which are divided into subsystems and connected by spring. Accuracy is evaluated in term of the distorsion of the eigenvalues by the approximation. It is found that the accuracy is represented by the one parameter consisting time step, stiffness of coupling, and mode shape coefficients.
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Masatsugu YOSHIZAWA, Hiroyoshi NAO, Eiji HASEGAWA, Yasushi TSUJIOKA
1984 Volume 50 Issue 458 Pages
1995-2003
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Buckling and postbuckling behavior of a flexible clamped-hinged pipe which is hanging vertically, due to an internal flow, are examined theoretically and experimentally. The equations of the axial fluid flow and the transverse motion of the pipe, which are coupled through the nonlinear terms, are derived. Assuming that the deflection of the flexible pipe is infinitesimal, the critical velocity of fluid, above which the pipe buckles, is determined from those equations. Under the super critical condition, the stable equilibrium solution with finite amplitude is analytically obtained. Also the numerical solution, which is available for large deflection, is obtained. This solution agrees good with the analytical solution in case of small but finite deflection. Furthermore the experiment was performed by using a pipe model conveying water. The experimental result is shown to be in good agreement with the theoretical one.
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Masaru SAKATA, Koji KIMURA, Masahiko UTSUMI
1984 Volume 50 Issue 458 Pages
2004-2012
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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The non-stationary response of an elastic circular cylindrical tank partially filled with liquid to a simulated earthquake excitation is investigated. The earthquake acceleration is modelled as an amplitude modulated non-white random process and the mean and standard deviation responses of liquid surface displacement and tank wall deformation are analyzed by the moment equation approach. The nonlinearity of liquid surface oscillation is considered in the response analysis to a long period earthquake excitation and the numerical results obtained have revealed the importance of nonlinear analysis for evaluating seismic safety of liquid storage tanks.
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Kohei SUZUKI, Yoshiya HARADA
1984 Volume 50 Issue 458 Pages
2013-2020
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Dynamic system identification technique, whereby the structural nonstationary behaviour can be estimated, is proposed and examined from the practical viewpoint. First, structural parameter estimating method with the aid of auto-regressive model fitting proposed in the former report is further developed to the system in which its natural frequency and damping variate with time. Such a structural nonstationality is represented as a kind of trajectory on the complex sτ-characteristic plane which is obtained through z-trans formed plane. Numerical examination is carried out for the practical model such as a liquid storage tank in which stored amount should variate with time. Second, proposed technique is applied to the inelastic structure system. Equivalent linealization is introduced in order to estimate equivalent damping which associates with inelastic energy absorbing effect. After linealization, it is made clear that inelastic behaviour can be also expressed on the linealized sτ-characteristic plane. Obtained results are investigated by comparing the results through statistical linealization method and the inelastic response analysis.
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Shigeru AOKI, Kohei SUZUKI
1984 Volume 50 Issue 458 Pages
2021-2028
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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Important mechanical systems installed on nuclear power plants and other industrial facilities must be designed not to lose their performance during and after destructive earthquake excitations. In this paper, reduction of the first excursion probability of such mechanical systems with inelastic restoring force-deformation relation is examined. First, the first excursion probability of inelastic mechanical system is estimated from experiment using stationary random noise as input. Next, relation between restoring force and deformation is identified from simulation technique using hysteresis loop obtained from experiment. Next, effectiveness of reduction of the first excursion probability for mechanical systems subjected to earthquake excitation is examined by using non-stationary artificial time histories. Finally, obtained results are examined by theoretical technique using equivalent linearization method. It is concluded that the first excursion probability of inelastic mechanical system is less than that of elastic system.
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Fumio HARA
1984 Volume 50 Issue 458 Pages
2029-2036
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This paper deals with the construction of an analytical model of a vertical mechanical structure subjected to 2D seismic excitation and numerical vibration analysis for 2D sinusoidal and stationary random excitations. Results indicated three kinds of vibrational resonance phenomena, i.e., (1) regular resonance to horizontal excitation. (2) parametric resonance to vertical excitation, and (3) combined resonance to simultaneous horizontal and vertical excitation.
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Ichiro KAGEYAMA, Akihiko KOGO
1984 Volume 50 Issue 458 Pages
2037-2045
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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This study analyzes the role of human factors in the steering system of two-wheeled vehicles, using equivalent mechanical elements as the first step toward systems analysis of the man/vehicle relationship. This steering system, including human factor, has approximately one torsional degree of freedom. These factors can be obtained by the frequency response of the steering bench model with rider. First, the reproducibility and linearity of human factors are checked. Then, the human factor values are shown, changing accordingly as the rider's handle grip and press forces vary. Finally, the equation for two-wheeled vehicle motion is derived, and the result of these calculations makes it clear that human factors play a major role in the behavior of two wheeled vehicles.
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Kazuki TAKENAKA
1984 Volume 50 Issue 458 Pages
2046-2053
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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A "Cup and Ball" game is demonstrated by the manipulator (AMY-3), which has three degrees of freedom and whose motion is restricted to a vertical plane, using dynamical control and dynamical processing of visual information. In this process, a very simple algorithm is proposed for searching the center of the moving white ball, by which pictures obtained from a TV-Camera are processed in a very short time. Moreover, combining vision system and motion control system, the servo system is constructed whose reference inputs (desired trajectory) are adjusted by visual information in real time, and then the availability is shown experimentally.
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Hideyuki TAMURA, Emil Halim GAD, Takahiro KONDO, Takashi AYABE, Atsuo ...
1984 Volume 50 Issue 458 Pages
2054-2062
Published: October 25, 1984
Released on J-STAGE: February 21, 2008
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The quasi-static vibratory analysis of a rotor supported by ball bearings is presented. The system is an ideal ball bearing in which the inner ring moves in the radial plane with two degrees of freedom under a constant radial load. The motion of the inner ring centre due to ball revolution, which has been known as the Perret-Meldau problem since the 1950s, is analysed in detail. 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 a numerical table and in charts. They represent a complete package for the estimation of the magnitudes and characteristics of the inner ring motion, and may be used in the design process to examine the rigidity, the critical speed, and vibratory nature of a rotor.
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