郑涛，陈卫东
摘要:针对工程中广泛应用的浮筏隔振装置,建立柔性基础复杂激励作用下多维耦合浮筏隔振系统的动力学模型。由于浮筏隔振系统在低频范围内减振效果欠佳,为改善浮筏隔振系统的隔振性能,把吸振器引入到浮筏系统。利用子结构导纳综合法分别建立带有动力吸振器、自调谐吸振器和主动式自调谐吸振器的浮筏隔振系统动力学模型。以功率流为指标,研究单频激励下吸振器对浮筏系统功率流传递特性的影响。最后分析多频激励下带有自调谐吸振器的浮筏隔振系统的功率流传递特性。以传递到基础的功率流为目标函数,分析主动式自调谐吸振器在多频激励下的减振效果。仿真结果表明,吸振器对浮筏具有良好的低频隔振效果,吸振器类型不同与安装方式不同对传递到基础的功率流有不同程度的抑制效果。
关键词：振动与波；浮筏；导纳；功率流；吸振器
Application of Vibration Absorbers in Floating Raft System
Tao Zheng, Weidong Chen
Abstract：To improve the isolation performance of the floating raft system under combined excitation, different vibration absorbers were applied. The dynamic models of the floating raft system with dynamic vibration absorbers （DVAs）, adaptive vibration absorbers （AVAs） or active-adaptive vibration absorbers （AAVAs） were established respectively by assembling the mobility matrices of subsystems. Effects of the vibration absorbers on power flow transmission characteristics of the coupled system were investigated under the single-frequency excitation. The power flow transmission characteristics of floating raft with AVAs under the multi-frequency excitation were studied. Taking the power flow transmitting into the foundation as the target function, the vibration reduction effect of the floating raft with AAVAs was studied. Numerical simulation results show that the vibration absorbers have good effects of vibration reduction in low frequency range. The types and installation of the vibration absorbers have different suppression effects on the power flow transmitting into the foundation.
Keyword：vibration and wave; floating raft; mobility matrices; power flow; vibration absorbers
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