Semi-active control floating raft vibration-isolating system

Abstract

A semi-active control floating raft vibration-isolating system is a three-layer vibration-isolating system and sequentially comprises a flexible base, an intermediate raft body and a unit serving as an object to be subjected to vibration isolating from ground to top. Lower layer vibration isolators are connected between the intermediate raft body and the flexible base. Upper layer vibration isolators are connected between the intermediate raft body and the unit. Controllable dampers are further connected between the intermediate raft body and the unit. A first sensor used for measuring the speed of the unit is installed on the unit. A second sensor used for measuring the speed of the intermediate raft body is installed on the intermediate raft body. The first sensor and the second sensor are connected with a computer. The first sensor inputs the vibration speed x1 of the unit to the computer. The second sensor inputs the vibration displacement speed x2 of the intermediate raft body to the computer. When x2(x2-x1) is smaller than 0, the computer outputs a signal and adjusts the controllable dampers to enable the controllable dampers to be in a shutdown state. When x2(x2-x1) is larger than or equal to 0, the computer outputs a signal and adjusts the controllable dampers to enable the controllable dampers to be in a starting state.

Description

technical field [0001] The invention relates to a vibration and noise reduction device for ships. [0002] technical background [0003] Floating raft vibration isolation is a vibration and noise reduction device applied to ships. Its mechanism is to use the design of elastic elements and intermediate masses in the floating raft vibration isolation device to attenuate the vibration energy, so that the vibration of the ship hull is reduced. . The semi-active control of vibration is to use a certain control strategy to automatically adjust the internal parameters of the system, so that the response of the system is in an optimal state. At present, the floating raft devices installed on ships are passively controlled. The structure and parameters of the system are fixed and cannot be adjusted with changes in the environment and excitation. If the operating conditions of the ship change, the vibration isolation effect may deteriorate , the semi-active control floating raft vibr...

AI Technical Summary

Problems solved by technology

In the exploratory research of semi-active floating raft vibration isolation in Shanghai Jiaotong University, the feed-forward fuzzy control strategy, the optimal damping control strategy based on the principle of variational method, and the semi-active static output feedback fuzzy sliding mode control and other control strategies are adopted. , the requirements for the controllable damper are: the controllable damper is continuously variable, the controllability is very high, and it is not easy to control

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