冲击载荷下浮放包装件摇摆特性和倾覆风险研究  

Rocking properties and overturning risk of a freestanding package excited by longitudinal shock

作　　者：朱大鹏[1] 曹兴潇 祁振民 ZHU Dapeng;CAO Xingxiao;QI Zhenmin(School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Electronic and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学交通运输学院,兰州730070 [2]兰州交通大学机电工程学院,兰州730070 [3]兰州交通大学电子与信息工程学院,兰州730070

出　　处：《振动与冲击》2024年第10期30-36,共7页Journal of Vibration and Shock

基　　金：甘肃省教育厅青年博士支持项目(2023QB-037);天津大学-兰州交通大学自主创新基金合作项目(2022063)。

摘　　要：浮放包装件运输过程中,在冲击载荷下可能产生倾覆,严重威胁着运输安全,分析浮放包装件在纵向冲击载荷下的倾覆风险对于确保运输安全十分重要。采用基于指数函数的分段函数模拟车辆制动产生的单峰值钟形冲击加速度,构建浮放包装件在纵向冲击载荷下摇摆运动方程式。对于宽高比角度α较小的包装件,线性化运动方程式,分别在β≠pT和β=pT两种情况下推导包装件摇摆运动方程式和倾覆边界条件,分析结果表明,在自由响应阶段,包装件更容易倾覆。对于宽高比角度α较大的包装件,基于对包装件摇摆运动方程式的能量分析,构建包装件非线性摇摆倾覆边界条件,模拟结果表明,该近似分析法具有良好的准确性。In cargo transportation,the large-scale freestanding package may overturn under longitudinal shock condition,which may lead to catastrophic consequences.Therefore,the analysis of overturning risks of freestanding package under longitudinal shock condition is critical to the package transportation safety.A 3-parameter piece-wise function based on exponential expression was used to simulate the single-lobe bell-shape shock acceleration produced by vehicle braking,the package was modeled by a rigid rectangle block,on this basis,the rocking motion equation of package was built.For small width-height ratio packages,the rocking motion equation was linearized,the rocking response equation and overturning boundary condition were obtained analytically underβ≠pT andβ=pT conditions respectively.The analytical results indicate the freestanding package is more prone to overturn in free response phase.For non-slender packages,the package rocking motion equation was rewritten in energy representation form,the approximation method for overturning boundary condition estimation was formulated.The numerical simulation results indicate the accuracy of this estimation method is acceptable.

关 键 词：运输包装 浮放包装件 摇摆 倾覆 边界条件 

分 类 号：TB485.3[一般工业技术—包装工程]