摘要
在使用冲击试验机对产品进行考核时,其往往达不到规定脉冲波形的峰值加速度和脉宽,需要靠试验人员的经验以及多次重复试验进行调整。因此,为了在冲击试验前准确地预测冲击波形,节省调试时间和资源,提出了一种采用非线性回归模型对波形峰值加速度和脉宽进行预测的方法。首先,采用Mooney-Rivlin模型拟合了波形发生器超弹性本构参数,建立了冲击系统有限元模型,并进行了冲击试验,对有限元模型的准确性进行了验证;然后,采用有限元和正交实验法研究了波形发生器硬度、厚度、直径和冲击台跌落高度等参数对冲击波形的影响;最后,选用幂函数作为多元非线性回归的函数形式,并剔除了显著性较低因素项,建立了冲击波形峰值加速度和脉宽的预测模型,并通过冲击试验对预测模型的准确性进行了验证。研究结果表明:波形发生器的厚度和直径及其交互作用是影响冲击波形的主要因素;通过对比回归模型预测值与冲击试验数据,发现两者误差不超过10%,表明该冲击波形回归预测模型具有有效性。
When using impact testing machine to evaluate products,it often fails to reach the peak acceleration and pulse width of the specified pulse waveform,and it needs to be adjusted by the experience of testers and repeated experiments.Therefore,in order to accurately predict the shock waveform before the shock test and save debugging time and resources,a method was proposed to predict the peak acceleration and pulse width of the waveform using a nonlinear regression model.First,the Mooney-Rivlin model was used to fit the hyper elastic intrinsic parameters of the waveform generator,a finite element model of the shock system was established,and shock tests were conducted to verify the accuracy of the finite element model.Then,the finite element and orthogonal experimental methods were used to study the effects of parameters such as hardness,thickness,diameter and shock table drop height of the waveform generator on the shock waveform.Finally,the power function was chosen as the functional form of multivariate nonlinear regression and the less significant factor terms were eliminated to establish the prediction model of peak acceleration and pulse width of the shock waveform,and the accuracy of the prediction model was verified by the shock test.The research results show that the thickness and diameter of the waveform generator and their interaction are the main factors affecting the shock waveforms.Comparing the predicted values of the regression model with the shock test data,it is found that the error between the two is not more than 10%,which indicates that the established regression prediction model of impact waveform is effective.
作者
刘博
闫明
李朕均
雷蕾
LIU Bo;YAN Ming;LI Zhenjun;LEI Lei(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《机电工程》
CAS
北大核心
2024年第9期1715-1722,共8页
Journal of Mechanical & Electrical Engineering
基金
辽宁省教育厅基金资助项目(LJKZ0108)
辽宁省教育厅科学研究项目(LJKMZ20220461)。
关键词
冲击波形峰值加速度
脉宽
波形发生器
有限元模型
正交实验
非线性回归
预测模型
peak acceleration of shock waveform
pulse width
waveform generator
finite element model
orthogonal experiment
nonlinear regression
predictive model
