物流非高斯振动下的产品损伤分析

Damage analysis of products under logistics non-Gaussian vibration

公路运输过程中的冲击信号造成了物流随机振动的非高斯特性。为研究冲击成分对产品损伤的影响,对8条中型卡车和重型卡车实测道路信号进行了统计分析。将振动信号分为20%的高强度非高斯信号、60%的中等强度高斯信号和20%的低强度高斯信号。使用有限元软件进行时域振动分析,计算各信号段的损伤占比。结果表明:振动过程中,非高斯信号蕴含了高强度的冲击信号,造成了绝大部分的损伤。中型卡车振动数据冲击幅值大、占比少,相对而言,重型卡车冲击幅值低、占比多。中型卡车高5%的冲击信号造成了90%以上的损伤;重型卡车20%的非高斯信号中除10%的冲击成分外还包含10%的较高幅值振动,其20%的非高斯信号造成的损伤约为80%或更高。在整个运输振动过程中,含量较少的冲击信号主导了损伤的累积。

The shock signals in the process of road transportation cause the non-Gaussian characteristics of random vibration process.In order to study the impact of shock on product damage,the measured 8 vibration signals of medium truck and heavy truck are statistically analyzed.The vibration signals are divided into 20%high-intensity non-Gaussian signal,60%medium-intensity Gaussian signal and 20%low-intensity Gaussian signal.The finite element software is used for time-domain vibration analysis to calculate the damage proportion of each signal segment.The results show that the non-Gaussian signal contains high intensity shock signal,which causes the most of damage.The shock amplitude of medium truck vibration data is large and accounts for a small proportion,while the shock amplitude of heavy truck is relatively low and accounts for a large proportion.The higher 5%shock signal for medium trucks caused more than 90%of the damage;The 20%non-Gaussian signal of heavy truck contains 10%higher amplitude vibration besides 10%shock component,and the damage caused by 20%non-Gaussian signal is about 80%or higher.In the whole transport vibration process,the shock signal dominates the accumulation of damage with less content.