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TECHNICAL PAPERS

Characteristics of a Liquid-Crystal Type ER-Fluid Variable Damper for Semiactive Vibration Suppression

[+] Author and Article Information
Hyun-Ung Oh, Junjiro Onoda, Kenji Minesugi

The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan

J. Vib. Acoust 122(4), 412-419 (Apr 01, 2000) (8 pages) doi:10.1115/1.1287031 History: Received October 01, 1999; Revised April 01, 2000
Copyright © 2000 by ASME
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References

Balas,  M. J., 1978, “Active Control of Flexile Systems,” J. Optim. Theory Appl., 25, No. 3, pp. 415–436.
Onoda,  J., Oh,  H.-U., and Minesugi,  K., 1997, “Semiactive Vibration Suppression with Electrorheological-Fluid Dampers,” AIAA J., 35, No. 12, December, pp. 1844–1852.
Klass,  D., and Martinek,  T. W., 1967, “Electroviscous Fluids. I. Rheological Properties,” J. Appl. Phys., 28, No. 1, pp. 67–74.
Hidaka,  S., Ahn,  Y.-K., and Morishita,  S., 1999, “Adaptive Vibration Control by a variable-Damping Dynamic Absorber Using ER-fluid,” ASME J. Vibr. Acoust., 121, July, pp. 373–378.
Kobayashi, N., Kobayashi, H., Saito, O., Yokoi, R., and Morishita, S., 1993, “A New Controllable Damper with Neuro Controller,” Proceedings of 12th International Conference on Structural Mechanics in Reactor Technology, Vol. K20/2, pp. 199–204.
Nakano,  M., Ito,  K., Konno,  M., and Ito,  K., 1998, “Antagonized Bellows Damper filled with Electrorheological Suspension and Its Application to Vibration Isolation Control as an Active Damper,” Trans. JSME, 64, No. 97-0465, pp. 804–810.
Stanway,  R., Sproston,  J. L., and Stevens,  N. G., 1987, “Non-Linear modeling of an Electro-Rheological Vibration Damper,” J. Electrost., 20, No. 2, pp. 167–184.
Morishita,  S., 1996, “Development of an Electrically Controllable Damper Using Liquid Crystal,” ASME J. Vibr. Acoust., 118, No. 3, pp. 373–378.
Kwakernaak, H., and Silvan, R., 1972, Linear Optimal Control System, Wiley-Interscience, New York.
Onoda,  J., and Minesugi,  K., 1996, “Semi-Active Vibration Suppression by Variable-Damping Members,” AIAA J., 34, No. 2, February, pp. 335–361.

Figures

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Cross section of an ER-fluid variable damper
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Elongation(d)-load(p) relation measured in repeated extension/contraction tests of the damper with various constant input voltages V(ḋ=50 mm/min,T=298 K)
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Elongation(d)-load(p) relation measured in repeated extension/contraction tests of the damper at two extension/contraction rates ḋ and two input voltages V(T=298 K)
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Elongation(d)-load(p) relation measured in repeated extension/contraction tests of the damper at various temperatures T(ḋ=50 mm/min, V=2 kV)
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Equivalent model of the ER-fluid variable damper
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Comparison of measured time histories of p with the time history calculated from the equivalent model
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Estimated values of k1 and k2 at various temperatures T
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Estimated values of c and f as a function of input voltage V
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An example of the characteristics of the particle-dispersion type ER fluid variable damper investigated by Onoda et al. (1997) (estimated values of c and f as a function of input voltage V)
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Cantilevered truss beam with a variable damper for numerical simulation
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Simulated time histories of semiactive vibration suppression by the type-LC damper with the control law specified by Eq. (21)
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Values of Irms obtained by various semiactive control laws and passive systems when the initial condition qinit=10 mm kg1/2. (—□—, —▪—, —○— and —•—: fA=0.63 N and fB=0.56 N, - -□- -, - -▪- -, - -○- - and - -•- -: fA=3.15 N and fB=0.11 N)
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Comparison of vibration suppression performances of type-LC and type-PD damper when the initial condition qinit=60 mm kg1/2
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Block diagram for semiactive vibration suppression experiments
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Time histories obtained in the semiactive vibration suppression experiments
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Comparison of time histories of tip mass displacement (u1) of the truss obtained by semiactive vibration suppression experiment and free decay vibration by keeping the various constant input voltage
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Time history of the estimated c responding to the switching on and off of the input voltage

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