振动试验载荷模拟的动力学原理与工程设计

载荷模拟的精度是振动试验模拟是否有效的决定因素之一.本文根据模态质量分析方法,讨论了基于响应功率谱密度的试验载荷等效性的动力学原理,给出了满足小阻尼稀疏模态特征的结构系统的简化表达式.简支梁和悬臂锥筒的数值模拟分析表明,采用本文方法设计的等效载荷可以取得足够精确的共振响应功率谱密度.

On dynamic principle of simulating excitation in vibration test and excitation design in engineering

The validity of vibration test comes from the equivalent of excititation, In this paper, the modal superpo sition method has been contributed to dynamic analysis of structural response to random vibration load. A formula was presented for computing equivalent of random vibration excitation and an engineering method was developed for test excitation design to low damping sparse modal system. Some numerical examples such as simple supported beam and two-story cantilevel cone shell were considered to verify the validity of proposed metheds.