Study on Strategies of Active Vibration Isolation in the Coupling Flexible System

Niu, Junchuan

doi:10.3901/jme.2001.12.027

Cited by 5 publications

(9 citation statements)

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“…They can also protect the equipments and instruments in ships and submarines from being damaged, and make them to be operated properly when ships and submarines are subjected to external loads and sudden shocks. As isolation of floating raft systems is a key technique for ships, in particular submarines, it has received much research attention in recent years (Nilson and Seland, 1977;Nelson, 1982;Hansen, 1993, 1994;Pan et al, 1992Xiong et al, 1996;Howard et al, 1997;Li et al, 1997;Sun and Song, 1999;Qu and Chang, 2000;Niu et al, 2001;Xiong et al, 2001;Sun et al, 2002). However, substantial works about floating raft isolation systems are limited to passive and active systems.…”

Section: Introductionmentioning

confidence: 99%

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-active Static Output Feedback Variable Structure Control

Zhao

Chen

2009

Journal of Intelligent Material Systems and Structures

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In this study, a semi-active static output feedback variable structure control (VSC) strategy is presented to control a two-stage electrorheological (ER) floating raft isolation system. A continuous semi-active static output feedback VSC controller is designed and a bypass ER damper is applied to achieve the best control effect more rapidly and accurately. The sliding surface parameters are determined in terms of the Routh-Hurwitz stability criterion. The optimal vibration attenuation of the intermediate mass is guaranteed due to the control rule that damping force only dissipates the vibration energy of the intermediate mass. The robustness of the control method with respect to parameter variations and the effectiveness of vibration isolation are demonstrated by numerical simulation results. It shows that the designed semi-active static output feedback VSC strategy realized by the ER damper can achieve better performance than that of optimally passive damping even if system parameter uncertainties exist. In addition, the experiment was carried out to demonstrate the practical effectiveness of the presented control scheme in this study. The experimental results are satisfied.

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Section: Introductionmentioning

confidence: 99%

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-active Static Output Feedback Variable Structure Control

Zhao

Chen

2009

Journal of Intelligent Material Systems and Structures

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“…Advanced theories and techniques are required to achieve noise reducing and control vibration of these flexible structures more efficiently. Recently, owing to the development of understanding of vibratory mechanics and the improvement of vibration control techniques, the power flow method is becoming an increasingly popular approach to estimate the vibration of a complicated flexible system [1][2][3][4][5][6][7][8][9][10][11]. As a result, active control techniques are drawing intensive attention to reduce the noise and vibration of structures [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…For the vibration control of SPR or SMR systems, a popular installation of mounts is the insertion of parallel structures of actuators or passive isolators between the source and the receiver to reduce the vibration transmission [3][4][5][6][7][8][9][10][11][12][13]. These actuators can only exert axial active control forces, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…force control of a system by force actuators. Considering power flow transmitted into the foundation as a cost function, some authors obtained substantial vibration cancellation of SMR systems by force actuators [3][4][5][6][7][8][9][10][11][12][13]. Although axial active forces can reduce noise and vibration significantly when only the axial vibration of the mounts or the lateral vibration of the foundation is considered, it performs poorly for vibration isolation in the highfrequency domain.…”

Section: Introductionmentioning

confidence: 99%

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An active vibration control model for coupled flexible systems

Niu

Leung

Lim

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents a novel general model for complex flexible coupled systems. In this model, parallel structures of force actuators and passive spring isolators are installed between the machine and the foundation, and some moment actuators such as piezoelectric patches are installed on the flexible foundation whose vibration cancellation feature is the key object of vibration control. This model combines active and passive control, force and moment control into a single unit to achieve the efficient vibration control of flexible structures by multiple approaches. The state-space governing equations of the coupled system are deduced. Based on the description of the state-space equation of the coupled system, the transmission paths for the power flow transmitted into the foundation are discussed in the frequency domain, and then combined into a single function. The function includes two parts: the passive and active terms, which can be conveniently employed in an optimal control strategy to achieve power flow control. The transmission characteristics of the power flow by optimal control are discussed in detail. Numerical simulations are presented to show that both force and moment controls in the analytical model can achieve substantial vibration cancellation.

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“…They are deemed as a type of efficient equipments for vibration isolation and noise reduction by isolating the vibrations of the host and auxiliary machines effectively. Because isolation of floating raft systems is an important technique for ships, in particular submarines, it has received much research attention in recent years (Nilsson Seland, 1977;Nelson, 1982;Pan et al, 1992;Pan and Hansen, 1994;Xiong et al, 1996;Howard et al,1997;Li et al, 1997;Sun and Song, 1999;Qu and Chang, 2000;Niu et al, 2001;Xiong et al, 2001). However, substantial works about floating raft isolation systems are limited to passive and active systems.…”

Section: Introductionmentioning

confidence: 99%

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-Active Fuzzy Sliding Mode Control

Zhao

Chen

2008

Journal of Intelligent Material Systems and Structures

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In this article, a semi-active fuzzy sliding mode control (FSMC) strategy for the vibration attenuation is presented based on the fact that for two-stage electrorheological (ER) damper floating raft isolation system, the upper bounds for uncertainty external disturbance and the parameters perturbation are hard to estimate in advance, and the damping force of ER damper is controlled continuously. The parameters of sliding surface are selected based on Hurwitz stable judgement of sliding mode motion equation. Fuzzy controller is designed in terms of the sliding mode reaching condition and the maximal damping force of ER damper. The optimal vibration attenuation of the intermediate mass is guaranteed due to the control rule that damping force only dissipates the vibration energy of the main object. The robustness of the proposed semi-active FSMC method with respect to parameter variations and the effectiveness of the controller designed in this study are demonstrated by numerical simulation. It showed that the proposed semi-active FSMC strategy realized by the ER damper can achieve better performance than those of optimally passive damping and maximum damping variety even if system parameter variations exist. In addition, the experiment was carried out to demonstrate the practical effectiveness of the presented control scheme in this study. The experimental results are satisfied.

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Study on Strategies of Active Vibration Isolation in the Coupling Flexible System

Cited by 5 publications

References 0 publications

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-active Static Output Feedback Variable Structure Control

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-active Static Output Feedback Variable Structure Control

An active vibration control model for coupled flexible systems

A Two-stage Floating Raft Isolation System Featuring Electrorheological Damper with Semi-Active Fuzzy Sliding Mode Control

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