飞行振动环境随机试验模拟的载荷等效

研究飞行振动环境载荷地面试验模拟的等效性问题。基于模态质量的振型叠加方法应用于结构随机振动的响应分析,导出了随机振动载荷等效的一般表达式。针对小阻尼稀疏模态结构,得出了随机振动载荷等效的一种工程设计方法,并通过数值模拟验证了方法的可行性。

Simulation of Excitation in Ground Random Vibration Test with Respect to Flight Environment

Excitation equivalence in ground vibration test with respect to real flight vibration environment is studied. The mode superposition method is applied to dynamic analysis of structural response to random vibration load. A formula is obtained for computing the equivalent random vibration excitation, and an engineering method is developed for the test excitation design for low damping sparse modal systems. Some numerical examples, such as 5-DOF lump parameter system, simply supported uniform beam and two-story cantilever cone shell, are given to verify the proposed methods.