A Design Concept With a Displacement Dependent Semi-Active Hydraulic Damper Energy Dissipation

Shih, Ming‐Hsiang; Sung, Wen‐Pei; Go, Cheer Germ

doi:10.1111/j.1747-1567.2003.tb00139.x

Cited by 20 publications

(17 citation statements)

References 8 publications

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“…However, it is difficult to find an actual damper with such a property, especially in a transient duration less than 40 ms [2,3] . Therefore, two customized devices are proposed to meet actual engineering needs, one is the velocity generator which applies the required force to impacting mass, and the other is the shock pulse regulator which controls the hydraulic bumper to obtain a damping coefficient approximating C(t).…”

Section: Fig 3 Nonlinear Model Of Hdsmmentioning

confidence: 99%

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Numerical modeling of dual-pulse shock test machine for simulating underwater explosion shock loads on warship equipments

Zhang

Wang

Wang³

2009

J. Shanghai Jiaotong Univ. (Sci.)

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In order to qualify shock resistance performance of shipboard equipments and simulate real underwater explosion environment, a novel dual-pulse shock test machine is proposed. The new machine will increase testing capability and meet special shock testing requirement. Two key parts of the machine, the velocity generator and the shock pulse regulator, play an important role in producing the positive acceleration pulse and the succeeding negative acceleration pulse, respectively. The generated dual-pulse shock for test articles is in conformity with an anti-shock test specification. Based on the impact theory, a nonlinear dynamic model of the hydraulically-actuated test machine is established with thorough analysis on its mechanism that involves conversion of gas potential energy and dissipation of kinetic energy. Simulation results have demonstrated that the proposed machine is able to produce a double-pulse acceleration shock in the time domain or a desired shock response spectrum in the frequency domain, which sets up a base for the construction of the machine.

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Section: Fig 3 Nonlinear Model Of Hdsmmentioning

confidence: 99%

“…The duration and the peak of the positive acceleration pulse are determined by the stiffness of the elastic programmer and the impact velocity of the impacting mass, respectively, and the negative pulse is controlled by the shock pulse regulator. 2 3…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of dual-pulse shock test machine for simulating underwater explosion shock loads on warship equipments

Zhang

Wang

Wang³

2009

J. Shanghai Jiaotong Univ. (Sci.)

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“…Nevertheless, the low pass filter causes additional time delay problem that may diminish the energy-dissipating capability of semi-active dampers. Shih et al 2002;2003;Shih & Sung 2004;Shih et al 2006 proposed new semi-active damper-Displacement dependent semi-active hydraulic damper (DSHD), accumulated semiactive hydraulic damper (ASHD), and velocity and displacement dependent hydraulic damper (VDHD) that include the electromagnetic valve implemented on the damper to select the correct switch. Thus, the quality of signals is somewhat improved to enhance the success of the control system.…”

Section: Introductionmentioning

confidence: 99%

A model for signal processing and predictive control of semi-active structural control system

Shih

Sung

Wang

2009

Sadhana

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The theory for structural control has been well developed and applied to perform excellent energy dissipation using dampers. Both active and semi-active control systems may be used to decide on the optimal switch point of the damper based on the current and past structural responses to the excitation of external forces. However, numerous noises may occur when the control signals are accessed and transported thus causing a delay of the damper. Therefore, a predictive control technique that integrates an improved method of detecting the control signal based on the direction of the structural motion, and a calculator for detecting the velocity using the least-square polynomial regression is proposed in this research. Comparisons of the analytical data and experimental results show that this predictor is effective in switching the moving direction of the semi-active damper. This conclusion is further verified using the component and shaking table test with constant amplitude but various frequencies, and the El Centro earthquake test. All tests confirm that this predictive control technique is effective to alleviate the time delay problem of semi-active dampers. This predictive control technique promotes about 30% to 40% reduction of the structural displacement response and about 35% to 45% reduction of the structural acceleration response.

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“…Thus, Kurata et al 1999;Dyke et al 1998;Symans & Constantinou 1997) have attempted to control the hydraulic pressure with additional oil-pressure valves in order to obtain an adaptive control by varying the damping coefficient of the damper. Shih et al ( , 2003 proposed new hydraulic dampers i.e. displacement dependent semiactive hydraulic damper (DSHD), and accumulated semi-active hydraulic damper (ASHD).…”

Section: Introductionmentioning

confidence: 99%

Development of numerical modelling of analysis program for energy-dissipating behaviour of velocity dependent hydraulic damper

Shih

Sung

2010

Sadhana

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A relief valve parallel to the throttle valve is added to a Velocity dependent hydraulic damper (VDHD) so that the orifice size that regulates the oil flow can be adjusted. This device adjustment will allow the damper to have an adaptive control of damping by changing its damping coefficient. A mathematical model including a serial friction model and a small damper that is parallel to the friction model added to the Maxwell model for simulating the actual energy-dissipating behaviour of the VDHD was proposed in this research. To extend the useful value of VDHD, a numerical analysis model based on the SAP2000 nonlinear analysis program was applied to simulate the energy-dissipating characteristics of VDHD in this study. The analysis results obtained by using the mathematical model and the proposed SAP2000 numerical model conform to the seismic resistant test results, and confirm that the SAP2000 nonlinear analysis program can accurately describe the actual energy-dissipating behaviour of the VDHD installed on structures under various energy-dissipating situations.

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A Design Concept With a Displacement Dependent Semi-Active Hydraulic Damper Energy Dissipation

Cited by 20 publications

References 8 publications

Numerical modeling of dual-pulse shock test machine for simulating underwater explosion shock loads on warship equipments

Numerical modeling of dual-pulse shock test machine for simulating underwater explosion shock loads on warship equipments

A model for signal processing and predictive control of semi-active structural control system

Development of numerical modelling of analysis program for energy-dissipating behaviour of velocity dependent hydraulic damper

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