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简述了直升机机载设备振动环境的特点,采用能量等效原则将正弦加随机的混合振动转化为宽带加窄带的随机振动,论述了边界条件的设置方式和具体的仿真步骤,该方法的提出使的计算机仿真分析得以应用;以电源箱外壳为例依次对该结构进行了模态仿真分析和随机振动仿真分析,得到了激励谱条件下外壳的振动响应结果和最大等效应力,分析了能量突变的原因并论述了应力结果的判断方式,试验结果也验证了仿真分析的可靠性,为直升机机载设备振动仿真分析提供了理论依据和实现方法。
The characteristics of vibration environment of helicopter airborne equipment are briefly described. The principle of energy equivalence is used to convert the mixed vibration with sinusoidal and random vibration into random vibration with wideband and narrowband. The setting of boundary conditions and specific simulation steps are discussed. So that the computer simulation analysis can be applied. Taking the case of power box as an example, modal simulation analysis and random vibration simulation analysis of the structure are carried out. The vibration response and the maximum equivalent stress of the shell under the excitation spectrum are obtained. The reason of the mutation and the way of judging the stress result are also discussed. The test results also verify the reliability of the simulation analysis and provide theoretical basis and realization method for the vibration simulation analysis of helicopter airborne equipment.