农用车载电子设备多介质耦合型双级减振系统设计探讨

Discussion on design of multi-medium coupling double isolator for electronic equipment in farming moving vehicle

农用车载设备通常存在较恶劣的振动环境,对其精密电子设备工作可靠性提出了很高的要求,需要采用双层减振系统对其防护方能满足使用要求,该文基于此工程应用要求,提出了一种多介质耦合型非线性双级减振系统的数学模型,考虑了平方阻尼、线性阻尼、库伦阻尼及非线性弹性元件的耦合;引入LAPLACE变换对模型进行了理论特性近似求解;具体讨论了确定性激励和随机激励时工作特性与减振器参数选择的方法,推导了相关加速度、速度和位移的均方值计算公式,结合案例说明工程设计应用;为双层减振系统进一步研究如参数设计和选择提供了理论参考。

There are some vibrations in farming mowng vehicle. This demands a high reliability for the precision electronic equipment in farming moving vehicle. The aim of this article is to provide a systematic method for designing a multi-medium coupling double isolator for precision electronic equipment in farming moving vehicles. A mathematical model of a multi-medium coupling double isolator was built for the demand of attenuating vibration based on actual applying. The coupling of quadratic damping, viscosity damping, coupling damping and nonlinear spring were introduced in the model. The approximate theoretical calculating formulae were deduced by combining linear transform, LAPLACE transform method. The working characteristics of the model and the parameters selection of the isolator were discussed based on determinated excitation or random excitation situation. Some calculating formulae about mean square value of acceleration, velocity and displacement were deduced. An example was introduced to illustrate the validity of the model. So the study establishes theoretical basis for progress research of the multi-medium coupling double isolator.