重要电子设备机箱动态特性分析与试验

Important electronic equipment chassis dynamic characteristics analysis and test

机箱结构的动态特性对机箱内电子设备运行的安全性和可靠性有着直接的影响。机箱在运输的过程中可能会因为发动机的振动产生共振,长期的共振会导致机箱的疲劳损坏。利用ANSYS workbench对机箱进行了模态和谐响应分析,旨在了解机箱的固有特性和振动性能。分析结果显示,机箱在75 Hz处发生了共振,但该频率处的最大变形在客户要求的范围内。长期的共振会产生疲劳损坏,因此必须选择合适的运输速率。为了验证机箱有限元模型的准确性,进行了正弦扫频试验。将试验结果与分析结果进行比较,发现二者比较接近,说明机箱有限元模型与实际模型基本接近。

The Chassis structure dynamic characteristics has a direct impact on electronic equipment that installed in it operation safety and reliability. The chassis may produce resonance because of vibration effect from the engine in the transport process, long-term resonance can lead to the fatigue damage of chassis. ANSYS workbench can be used for the chassis＇ mode and harmonic response analysis, this study is to understand the inherent characteristic and vibration performance of the chassis, analysis results show that the chassis produce resonance in 75 hz, but the biggest deformation in the first order natural frequency is in the customer required range. Long-term resonance can produce fatigue damage, so we must choose the right transport rate. In order to verify its finite element model calculation results, the paper makes sine sweep test of the chassis. Both the test results and calculation results are found to be close after comparison, proving that the finite element model and the practical model are basically close.