阻尼对正切型包装系统易损件冲击谱影响

EFFECT OF DAMPING ON THREE-DIMENSIONAL SHOCK SPECTRA OF A TANGENT PACKAGING SYSTEM WITH A CRITICAL COMPONENT

研究考虑易损件的正切型包装系统在半正弦脉冲激励下的冲击特性。建立考虑阻尼的二自由度非线性产品包装系统模型,得到冲击动力学方程并数值求解。讨论了易损件与主体连接部阻尼和缓冲垫阻尼对易损件冲击谱的影响规律。结果表明,在低频率比处连接部阻尼和材料阻尼的影响均很显著,而在高频率比处,连接部阻尼几乎没有影响。研究结论为产品包装设计提供科学依据。

Effect of damping ratio of a critical component and a cushioning pad on the shock characteristics of the critical component of a tangent packaging system are investigated under action of half-sine acceleration pulse. The dynamic model of the system is developed, and the numerical results of the dynamic equations are obtained.Then,the effect of the damping ratio on the three-dimensional shock response spectra of the critical component is discussed.The strong frequency ratio dependence nature of the effect is found.The peak of the shock response of the critical component can be decreased at low frequency ratio by increasing the damping ratio of the critical component,while the peak of the response of the critical component decreases with the rise of damping ratio of the cushioning pad at both lower and higher frequency ratio.The results lead to some insights into design of cushioning packaging.