Active vibration control simulation and experiment studies of underwater structures based on a reduced order model

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (3) : 70-76.

YU Danzhu, LI Sheng

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Abstract

In order to effectively suppress vibration of an underwater structure, its active vibration control simulation and experiment studies were implemented based on a reduced order model. The compressible fluid-loaded undamped modal matrix was used to build the reduced order model of the underwater structure. Due to dimension number’s reduction, a simplified vibration active control system was designed to decrease the number of sensors and actuators. Active control of
underwater structural vibration of a plate was simulated with the linear quadratic（LQ）control method and the variable stiffness control method, respectively. The simulation results showed that the plate’s vibration amplitude is quite well controlled with the LQ control method, while the natural frequencies of the plate can be changed according to requirements with the variable stiffness control method; based on the reduced order model, the active control is relatively easy to implement and the experimental results verifies the vibration reduction effects of active control technique on underwater structures.

Key words

underwater structure / reduced order model / vibration active control / LQ optimal control / variable stiffness control / experimental study

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YU Danzhu, LI Sheng. Active vibration control simulation and experiment studies of underwater structures based on a reduced order model[J]. Journal of Vibration and Shock, 2017, 36(3): 70-76

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