EPS非线性缓冲包装系统跌落冲击响应分析的线性化方法  

Linearization Method for Dropping Shock Dynamic Response Analysis in EPS Nonlinear Packaging Systems

作　　者：宋杰 陈安军 SONG Jie;CHEN Anjun(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;China National Control and Testing Center for Packaging Quality,Wuxi 214122,Jiangsu,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]国家轻工业包装制品质量监督检测中心,江苏无锡214122

出　　处：《噪声与振动控制》2020年第4期63-66,108,共5页Noise and Vibration Control

摘　　要：为获得非线性系统跌落冲击加速度响应最大值,以EPS缓冲包装系统为研究对象,将系统的全局非线性通过离散转化为局部工作点线性,建立系统动力学方程,获得局部工作点系统响应加速度最大值的解析表达。静、动态试验结果与实测结果的比较分析表明,基于动态试验预测的加速度最大值相对误差小于5%,基于静态试验预测的最大加速度相对误差在10%以内,动态试验预测结果优于静态试验。在黏性阻尼假设条件下,随阻尼比(系统阻尼比小于0.2)增加,基于静、动态试验预测的加速度最大值减小,相对误差增大。该方法分析过程无需系统非线性本构关系,可推广到其他非线性缓冲包装系统跌落冲击加速度响应的预测分析。A dynamic model of a nonlinear EPS cushion packaging system is established to obtain its drop-impact response.The global nonlinear system is discretized into a series of locally linearized working points.The dynamic equation of the system is established.The analytical expression of the maximum acceleration of the system response of the local working points is obtained.Compared with the experimental results,the analysis of static compression test and dynamic impact test shows that the relative errors of the maximum acceleration predicted by the dynamic test and by the static test are less than 5%and 10%respectively.So,the result predicted by dynamic test is better than that by the static test.Under the assumption of viscous damping,as the system damping ratio(less than 0.2)increases,the maximum accelerations predicted by both static and dynamic tests decrease and the relative errors increase.This model does not require nonlinear constitutive relationship and can be applied to predict the dropping shock responses of other non-linear cushion packaging systems.

关 键 词：振动与波 EPS 非线性 线性化方法 加速度最大值 跌落冲击 

分 类 号：TB485.3[一般工业技术—包装工程] TB487