半正弦脉冲激励下考虑易损件的正切型包装系统冲击特性研究

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.提出适合描述考虑易损件的产品包装系统三维冲击谱新概念,并进一步讨论了频率比、脉冲激励幅值和系统参数对易损件冲击谱的影响规律,结果表明,频率比、脉冲激励幅值和系统参数对易损件冲击响应峰值影响显著,研究结论为产品包装设计提供科学依据.

3-DIMENSIONAL SHOCK RESPONSE SPECTRA CHARACTERIZING SHOCK RESPONSE OF A TANGENT PACKAGING SYSTEM WITH CRITICAL COMPONENTS

The shock characteristics of a tangent packaging system with critical components are investigated under action of a half-sine acceleration pulse.The dynamical model of double-degree of freedom of the system is developed,and the numerical results of the dynamical equations are obtained using Runge-Kutta method.Then,to evaluate the shock characteristics of this packaging system,a new concept of three-dimensional shock response spectra is proposed,with the dimensionless pulse duration,the frequency ratio and the ratio of the maximum shock response acceleration of the critical component to the peak pulse acceleration being the three basic coordinate parameters.Based on the numerical results,the effects of the pulse duration,the frequency ratio,the pulse peak acceleration and the system parameter on the maximum shock response acceleration of the critical component are discussed.It is shown that all effects are noticeable.The results lead to some insights into design of cushioning packaging.