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直升机平台的正弦加随机振动谱线无法直接做为边界条件施加在有限元模型上,必须转化为仿真软件可用的谱线。文中详细介绍了传统的正弦加随机谱线转化为窄带加宽带谱线的方法及其转化公式,并提出了2种新的谱线转化方法,即分离为纯正弦谱线和纯随机谱线的方法,以及基于振动试验的一种新的转化为窄带加宽带谱线方法,最后以某PCB板组件为例在NX Nastran中进行了对比仿真分析。结果表明,3种转化方法中基于试验的转化方法最为严酷,分离为纯正弦与纯随机方法次之,传统的转化方法响应最小。
The sinusoidal and random vibration spectrum of the helicopter platform can not be directly applied as the boundary condition to the finite element model and must be converted into the spectrum available for the simulation software. In this paper, the traditional method of converting sine and additive spectral lines into narrowband and wideband spectral lines is introduced in detail. Two new spectral transformation methods are proposed, that is, separation into pure sine and purely random spectral lines Method, and a new method based on vibration test to transform into a narrow-band widening band spectrum method. Finally, a comparative simulation analysis is carried out in NX Nastran using a PCB board assembly as an example. The results show that the three transformation methods are the most rigorous transformation methods based on experiments, separated into pure sine and pure random methods, followed by traditional transformation methods.