模态叠加方法进行响应谱分析的叠加方法比较

计算机箱骨架谱响应时，采用不同的模态合并方法，计算结果会有相当大的差别。本文讨论了运用有限元方法计算机箱骨架在谱激励下的响应的若干方法。以电子设备的机箱骨架作为研究对象，将采用这些模态叠加方法计算得到的结果与时域计算方法得到的计算结果进行了比较，给出了对类似的结构进行计算时选取模态叠加方法的建议，为后继的设计计算提供了选取计算方法的依据。

Comparison of Modal Superposition Methods for Response Spectrum Analysis

When calculating spectrum response of a box frame, it was discovered that the re sults depended greatly on the chosen methods of modal superposition. This thesis discusses several methods for calculating the response spectrum of a box frame under conditions of vibration with FEA methods. Focusing on this box frame, the results got from the modal superposition methods are compared against that got f rom time-history analysis, thereby some suggestions in choosing superposition me thods are given, as a ground for further calculations.