基于旁支式次级源的舰船液压管路低频脉动有源衰减

Active control of low-frequency pulsation in marine hydraulic system using by-pass secondary source

舰船液压系统的低频脉动伴随流体沿管路传递,产生结构振动的线谱。针对难以通过被动式衰减的低频脉动,设计旁支式次级源,进行有源衰减的研究。所设计的旁支式次级源采用压电陶瓷驱动,结构紧凑且增加了放大结构,从而提高了响应特性。搭建液压管路的有源控制系统,采用FxLMS自适应算法,进行多线谱脉动的控制实验。实验结果表明,旁支式次级源能够对多线谱低频脉动进行有效衰减,减小随流体传递的振动能量,且对原液压系统工作性能无影响。

The low-frequency pulsation of the marine hydraulic system is transmitted along the pipe,which can create structural vibration.For the low-frequency pulsation which is difficult to control by passive style,a by-pass secondary source was designed and the pulsation control research by active style was carried out.The designed by-pass secondary source was driven by piezoelectric ceramics,which is compact and has an amplification structure to improve response characteristics.The active control system of the hydraulic system was built,and the FxLMS adaptive algorithm was used to control the pulsation at multi-frequencies.The experimental result shows that the by-pass secondary source can effectively attenuate the low-frequency pulsation at multi-frequencies,and can reduce the vibration energy transmitted with the fluid,which has no negative effect on the working performance of the original hydraulic system.