建立某舰载机柜的有限元模型，采用瞬时动态分析法对机柜在冲击状态下的振动行为进行模拟计算，并分析了机箱托架厚度和立柱厚度等对冲击响应的影响.结果表明：机柜的立柱、机箱、托架以及盖板属于机柜敏感区域，容易产生高幅振动；机柜底板不同区域对冲击力的响应不同，因此传递到机柜不同部位的振动信号有所不同；随着高度增加，机箱法向位移和振动强度总体呈降低趋势；机柜系统的前后不对称性是导致机柜顶盖不同区域和前后立柱振动强度有所不同的主要原因.此外，参数化研究结果表明托架厚度和立柱厚度对机柜冲击响应也有重要影响.研究结果可为机柜结构抗冲击的合理设计提供理论依据.
A finite element model of a shipboard electric cabinet was established, and the vibration signals in different areas under the impact state were simulated by using the transient dynamic analysis method in Abaqus. The effect of the thickness of box bracket and stand columns on the impact response of cabinet was analyzed as well. The results show that the column, box, bracket and cover of the cabinet are sensitive areas of cabinet, and tend to generate high amplitude vibration. Since different areas of cabinet floor exhibit different responses to impact behavior, the vibration signals transmit to different parts of cabinet are different. As the height increases, the normal displacement and vibration intensity of box decrease gradually. The asymmetry of front and rear of cabinet system is the main reason for difference of vibration intensity between the different areas of cabinet top and front and rear columns. In addition, the thicknesses of bracket and column also have strong influence on the impact response of cabinet. The results can provide the theoretical basis for the reasonable design of impact resistance of cabinet structure.
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