带限位器的冲击隔离器刚度计算模型

Calculation Model of Shock Isolator with Limiter

用数值方法模拟带限位功能的冲击隔离器一般采用双线性模型,即在限位器发挥作用前计算模型中的刚度为隔离器的冲击刚度,然而,众多研究表明,隔离器的静刚度、动刚度以及冲击刚度3者在数值上存在较大的差异。为探究2种计算方法在计算结果上的差异性,提高隔离器计算的准确性,对带限位器隔振装置的计算方法进行改进,将传统的双线性计算方法加以优化,采用多线性计算方法。建立结构模型,将隔离器以及限位器的接触部分简化为弹簧和阻尼器;选择合适的隔离器,加载与之相适应的冲击环境;对加速度和速度响应分别进行对比分析。得出结论:多线性计算方法与双线性计算方法计算结果有一定差异,多线性计算方法所计算的加速响应峰值较多线性方法有所降低,且振荡次数减少。多线性计算方法所计算的位移响应峰值略小于双线性计算方法的计算值,多线性计算方法使得响应脉宽出现先窄后宽的现象。

Shock isolator with limiting function is simulated by bilinear model commonly, the stiffness of which is calculated as the impact stiffness of the isolator before the limiter works. However, many researches show that there is great difference in numerical value a- mong isolator static stiffness, dynamic stiffness and impact stiffness. In order to explore the differences between the two calculation methods in the calculation results, and improve the ac- curacy of the isolator calculation, the calculation method of the vibration isolation device with limit device is improved. Traditional bilinear calculation method is optimized, and the method of multilinear calculation method is proposed. The structure model is established, and the iso- lator and contact part limiter are simplified as springs and dampers. After the selection of iso- lator equipment, adaptive impact environment is loaded. The acceleration and the velocity re- sponse are analyzed through the comparison of the output results. It can be concluded that there are some differences between the results of the multilinear calculation method and the bi- linear calculation method. The peak value of the acceleration and displacement response calcu- lated by the multilinear method is lower than the calculated value of the multilinear method. The multilinear method makes the response pulse appear the phenomenon of being narrow first and wide later and reduce the number of oscillations.