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以整体叶盘振动抑制为目的,利用压电材料在叶盘结构不同扇区形成异周期系统,并将与压电材料连接的外部电路并联或串联形成不同形式的网络,建立该机电耦合系统的动力学方程,分析其对叶盘结构动力学特性的影响效果。研究发现,双周期压电网络对叶盘结构的频率影响很小,在本文所研究的叶盘结构模型的参数变化范围内仅对频率转向区有轻微的影响,变化最大只有2%;但是双周期压电网络会对叶盘结构的模态振型产生很大的影响,会使原各阶单一节径振型变为多节径振型,节径种类数跟双周期数有关;压电网络还会把机械位移转化为电荷位移;同时压电网络中电阻元件的引入提高了系统的模态阻尼比。这些都会对叶盘结构的振动响应起到很好的抑制效果。最后,采用修正的模态置信因子M M AC对双周期压电网络系统进行了振动抑制特性的评估,结果表明,通过对结构系统双周期数的设计能有效提高振动抑制效果。
In order to suppress the vibration of the whole leaf disk, piezoelectric materials are used to form different periodic systems in different sectors of the leaf disk structure, and the external circuits connected with piezoelectric materials are connected in parallel or in series to form different types of networks, and the electromechanical coupling system Kinetic equation, analyze its effect on the dynamic characteristics of the leaf disc structure. The results show that the frequency of the two-period piezoelectric network has little influence on the structure of the leaf disc, and only a slight change of the frequency steering area is affected by the parameters of the leaf disc structure model studied in this paper, with the maximum variation being only 2% The periodic piezoelectric network will have a great influence on the modal vibration modes of the leaf disc structure, and will change the original single-section radial mode into multi-section radial mode, The network also converts the mechanical displacement into a charge displacement. At the same time, the introduction of resistive elements in the piezoelectric network improves the modal damping ratio of the system. These will play a good inhibitory effect on the vibration response of the leaf disc structure. Finally, the modified modal confidence factor M MAC is used to evaluate the vibration suppression characteristics of the bi-periodic piezoelectric network system. The results show that the vibration suppression effect can be effectively improved by designing the double cycle number of the structural system.