Dynamic simulation analysis of an on-board electronic cabinet is carried out with the help of FEM software ANSYS. The vulnerable parts in the cabinet are detected, which provide the basis for structural reinforcement of the cabinet. ln order to enhance the dynamic stiffness and the fundamental inherent frequencies of the cabinet, stiffeners in the external boards are adopted, the thickness of the bottom of the box is increased, and the connecting style of the box to the frame is transformed thus improving the dynamic performance of the cabinet.%应用有限元分析软件ANSYS对某车载环境中的电子机柜进行了动力学仿真分析，确认了电子机柜的主要薄弱环节，为电子机柜的结构加固提供依据。以提高电子机柜整体的动刚度和低阶固有频率为目的对外侧板和插箱进行了动态修改，外侧板采用加强筋处理，插箱通过增加箱底厚度以及改变其与机架的连接方式，从而改善了电子机柜的整体动态性能。
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