抖振载荷谱等效简化方法试验研究

Experimental Study on Equivalent Simplification of Buffeting Load Spectrum

目的对抖振疲劳载荷谱等效方法开展试验验证工作。方法给出从抖振载荷响应应力概率密度函数分区等效常规疲劳响应应力的计算公式,分别进行模拟抖振试验和定频悬臂弯曲疲劳试验,后者试验的控制参数需要根据计算的等效应力进行设置和调整,对比两个试验中试件寿命的一致性。结果形成了有效的试验方法,试验结果与理论设计基本一致,进一步根据试验现象,提出了试验的改进方案。结论该等效方法有效。

The paper aims to test and verify the equivalent method of buffeting fatigue load spectrum.The calculation formula of equivalent conventional fatigue response stress was given from the probability density function of buffeting response stress.Simulated buffeting test and fixed frequency cantilever bending fatigue test were carried out.The control parameters of the latter need to be set and adjusted according to the calculated equivalent stress.Finally,the consistency of the specimens fatigue life between the two tests was compared.An effective test method was formed.The experimental results were in good agreement with the theoretical calculation.Furthermore,according to the experimental phenomena,the improvement scheme was proposed.The equivalent method is effective.