Abstract: The floating raft system with active-adaptive vibration absorbers (AAVAs) was studied. The dynamic models of the system with combined excitation were implemented by assembling the mobility matrices of the subsystems. Then the power flow expressions of this system with/without AAVAs were obtained. Considering the power flow transmitted into the foundation as the cost function, the effects of different control strategies under the single- frequency excitation were studied and compared. Numerical simulation results show that the total power-flow-minimization control strategy is much better than the others. It can achieve effective broad-band vibration absorption and reduce the power flow transmitted into the foundation significantly. The axial-force-minimization control strategy can produce good results at low frequencies, while the axial-velocity-minimization control strategy can produce good results at intermediate frequencies. Finally, adopting the total power-flow-minimization control strategy, the vibration reduction effect of AAVAs under multi-frequency excitation was verified.

Key words: vibration and wave, active adaptive vibration absorbers, power flow, active control

摘要： 以带有主动式自调谐吸振器的浮筏隔振系统为研究对象，运用子结构导纳矩阵法建立混合激励下有、无吸振器的系统动力学模型，并给出系统的功率流表达式。以传递到基础的功率流为代价函数，对比研究单频激励作用下不同主动控制策略的控制效果。仿真结果表明，总功率流最小化控制策略的控制效果最为理想，可以实现较宽频带下振动控制。轴向力最小化控制策略在低频段具有良好的控制效果，而轴向速度最小化控制策略在中频段的控制效果较佳。最后，采用总功率流最小化控制策略，验证多频激励作用下主动式自调谐吸振器的减振效果。

关键词: 振动与波, 主动式自调谐吸振器, 功率流, 主动控制