关键词：汽车；型商用车；驾驶室白车身；有限元法；模态分析
摘 要：The finite element model for the cab body-in-white (BIW) of heavy commercial vehicle is setup,and based on which a modal analysis is performed.In order to verify the accuracy of the model,using multiple input multiple output methods on body structure modal test,using modal analysis technique to identify the inherent frequency and vibration type.Access to the cab modal distribution,in order to improve the structure of the weak areas to enhance the overall performance of structure,proposed amendments.