一种磁斥力负刚度结构的线性优化设计

A Linear Optimal Design Based on Magnetic Repulsion Negative Stiffness Structure

为降低负刚度结构刚度值的非线性程度,提高在整个振动位移范围内负刚度值的稳定性,扩大负刚度结构的可用振动位移范围,设计了一种基于磁斥力的负刚度结构设计,并给出确定其结构参数的具体方法。为此建立了新型负刚度结构的模型,确定需要设计的结构参数。分析刚度曲线的变化选择结构参数具体数值,使该结构的负刚度值满足要求。仿真结果表明,在相对较大的振动位移内,优化后的负刚度结构的刚度值非线性大幅降低,稳定性相较基于磁斥力的三磁体负刚度结构有大幅提升,达到了预期目的,可以为负刚度结构在各方面的设计和应用提供一定的理论参考。

To reduce negative stiffness structure(NSS)’s stiffness nonlinearity,enhance its stability during entire working displacement range,and expand its allowable working displacement,an NSS design is proposed based on magnetic repulsion,and method of designing its parameters is provided.For the purposes above,the NSS’s model was built and parameters need to design were selected.To confirm parameters’value,stiffness curves’change was analyzed,so that the NSS’s stiffness value can fulfill requirement.Simulation result shows that,in a relatively longer displacement,the optimized NSS’s stiffness nonlinearity is greatly reduced,and its stiffness stability is promoted substantially compared with simple triple-magnet NSS based on magnetic repulsion.That may provide theoretical reference to NSS’s design and application in various respects.