多层回转体预紧结构层间转动试验
Experimental Research on Interlayer Rotation Property of Multilayer Cylindrical Structure

为研究含黏弹性材料多层回转体结构在轴向振动作用下的层间转动特性，设计了多层回转体试验件，进行了黏弹性材料压缩力学性能研究，建立了考虑黏弹性材料非线性力学特性的结构动力学模型。基于模态试验考察了不同预紧力条件下结构的模态变化规律，在此基础上开展了随机振动环境下试验件层间转动特性试验，获得了确定的层间转动现象，并研究了不同振动量级及预紧力对层间转动的影响。基于随机振动试验获得了含黏弹性材料回转体预紧结构层间转动与否的预紧力、振动量级分界线。相关试验结果可为工程设计提供支持。
In order to study the property of interlayer rotary slippage in axial vibration, a pre-tightened cushion layered cylindrical structure was designed and constructed. The compression characteristics of silicon foam cushion material were measured, the dynamic model of the structure was constructed considering the cushion′s nonlinear mechanical characteristics, and the experimental modal analysis of the structure was investigated based on different pre-tightened loads. Then, in order to study the property of interlayer rotation, experiments of the structure in axial vibration were carried out, the slip phenomena between the layers were obtained, and the influence of the pre-tightened load and vibration magnitude were studied. Finally, through the results of the random vibration test, the boundary of the pre-tightened load and the vibration magnitude with interlayer rotation were obtained. These results will provide guidance for practical designs.