半主动控制浮筏隔振系统的开关算法研究

Switching algorithm of semi-active controlled floating raft isolation system

为了弥补浮筏隔振系统的隔振效果在低频段尤其是共振频率附近的不足,引入半主动控制技术。建立半主动控制浮筏隔振系统的动力学模型,以传递至筏体的动能最小为原则,提出算法1;以筏体动能最小且输入能量最小为原则,提出算法2。建立Simulink仿真模型,对无控制和按算法进行控制的基础加速度响应进行仿真。结果表明,采用算法1和算法2对浮筏隔振系统进行开关半主动控制,可明显抑制系统在共振频率附近的基础振动加速度响应。通过试验对仿真结果进行验证,证明了仿真结果的可靠性以及两种算法的有效性。

Technology of semi-active control is proposed for the sake of offsetting the insufficient of floating raft isolation system at low frequencies, especially at the surrounding of resonance frequencies. A dynamic model of semi-active controlled floating raft isolation system is established, Algorithm 1 based on the principle of minimum kinetic energy transmitted to the raft is proposed, and then Algorithm 2 based on the principle of minimum kinetic energy of raft and minimum input energy is proposed. Simulation model of Simulink is built to evaluate the acceleration response on the foundation with non-control and algorithm control, and the simulation results show that the foundation’s vibration acceleration response near the resonance frequency of system is restrained significantly by Algorithm 1 and Algorithm 2 implemented for switching semi-active control of floating raft isolation system. The simulation results prove the reliability of the simulation results and the effectiveness of two proposed algorithms.