A passively self-tuning resonator configuration is presented in this study. Under certain operating conditions, a self-resonating system has the capability to passively adjust dynamical characteristics until the whole system becomes resonant. A clamped–clamped beam with an attached mass sliding along the beam and a slight gap that, under a harmonic input excitation and well-defined operating regime, can lead to the increase in voltage amplitude generated by the piezo-harvester attached to this structure may be an example of such a system. Taking into account such behavior of the system, the paper is focused on determining the distributed-parameters of the electromechanical system versus a different slider position on the beam in modal coordinates. The obtained simulation results, considering the homogenous model of an MFC element for the desired slider locations, showed how the width of the gap between the slider and the beam additionally influences the voltage generated by the piezo-harvester. Experimental tests carried out on the real stand with an EHE301 module and the designed SSHI interface circuit allowed to verify the numerical results and also showed the influence on the resistive load connected to the system for an improvement of the considered energy harvesting system parameters.

本研究提出了一种无源自调谐谐振器配置。在某些操作条件下，自谐振系统具有被动调节动力特性的能力，直到整个系统都变得谐振为止。带有束缚质量的夹束梁沿束流滑动，并且在谐波输入激励和明确定义的工作状态下存在微小间隙，会导致由附着在该结构上的压电收割机产生的电压振幅增加是这样一个系统的例子。考虑到系统的这种行为，本文的重点是确定机电系统的分布参数与模态坐标中梁上不同的滑块位置的关系。获得的仿真结果，考虑到MFC元件针对所需滑块位置的均匀模型，显示了滑块和梁之间的间隙宽度如何另外影响压电收割器产生的电压。使用EHE301模块和设计的SSHI接口电路在真实支架上进行的实验测试可以验证数值结果，并且还显示出对连接至系统的电阻负载的影响，从而改善了所考虑的能量收集系统参数。