随机振动下产品包装系统传递路径分析

Transfer path analysis of product packaging system under random vibration

实验研究不同激励谱型、不同振动等级、不同缓冲衬垫厚度和不同衬垫分配方式下产品包装系统的振动响应规律,利用工况传递路径分析法(OTPA)量化随机振动下产品包装系统各传递路径的振动贡献量。结果表明:当振动等级较高时,包装件出现轻微跳动现象,系统振动响应增大,共振频率略微减小;随着缓冲衬垫厚度的增加,系统共振频率减小,不同激励谱下关键元件的加速度响应功率谱密度(PSD)有所差异,振动响应与系统共振频率处的激励能量大小有关,衬垫厚度对各路径的振动贡献量影响较小;衬垫分配方式对关键元件上的响应PSD影响较大,不同衬垫分配方式可调节各传递路径的振动贡献量大小;当缓冲衬垫面积均匀分配时,利用OTPA方法识别出系统的主要振动贡献路径,将其定义为关键振动传递路径,关键元件的响应与关键振动传递路径在共振频率附近的振动贡献量紧密相关,缓冲包装设计应重点关注关键振动传递路径的减振设计。研究结果为进一步研究缓冲包装设计方法提供理论支撑。

The vibration response of the product packaging system under different excitation spectra,different vibration levels,dif⁃ferent cushion thicknesses and different cushion distribution methods are investigated,and the vibration contribution of each trans⁃fer path of the product packaging system under random vibration is quantified by using the OTPA method.The results show that when the vibration level is high,the packaging system show slight jumping phenomenon,and the vibration response of the system increases while the resonance frequency decreases slightly.With the increase of the cushion thickness,the resonance frequency of the system decreases,the acceleration response power spectrum(PSD)of the critical element under different excitation spectra is different,the vibration response is related to the excitation energy at the resonance frequency of the system,and the cushion thick⁃ness has a small effect on the vibration contribution of each path.When the cushion pad area is uniformly distributed,the OTPA method is used to identify the main vibration contribution path of the system,which is defined as the critical vibration transfer path,and the response of the critical element is closely related to the vibration contribution of the critical vibration transfer path near the resonant frequency,and the design of the cushion package should focus on the vibration damping design of the critical vibration transfer path.The results of the study provide theoretical support for further research on cushion packaging design methods.