两模机械系统中振动模式参量耦合强度调控的实验研究

Experimental investigation of parametric coupling strength control of two vibration modes in a two-mode mechanical system

在基于两根耦合悬臂梁的机械系统中开展了振动模式参量耦合实验,研究了模式频率差对模式耦合强度的影响。实验中利用激光囚禁其中一根悬臂梁,构造了一个可调谐两模机械系统,并通过对囚禁光功率的周期性调制施加参量驱动,实现了振动模式间的参量耦合;进一步研究了不同模式频率差下的模式参量耦合,在实验上得到了模式间频率差与模式耦合强度之间的关系。该研究将有助于实现机械系统中不同模式频率差下模式耦合强度的精确调控。

Experimental investigation of parametric coupling of two vibration modes in a two-coupledcantilever-based mechanical system is carried out,and the influence of mode frequency difference on coupling strength is investigated.In the experiment,a tunable two-mode system is constructed by trapping one of the cantilevers optically,and the parametric coupling between the two modes is realized by applying a parametric drive through periodically modulating the trapping power.Furthermore,the parametric coupling under distinct frequency differences between two modes is studied and the relationship between coupling strength and frequency difference is obtained experimentally.The result is beneficial to realizing the accuracy control of the coupling strength of two modes under distinct frequency differences.