摘要
提出一种能简化加速车身台架疲劳试验的程序载荷谱编谱方法。基于试车场实测路谱准确获取车身连接点随机载荷谱,并简化为车身转矩载荷谱。应用雨流计数法和数理统计方法,得到均幅值载荷分布规律,其中均值服从正态分布,幅值服从威布尔分布;编制程序载荷谱并简化。应用有限元法和疲劳分析理论对车身疲劳寿命进行预测,从疲劳所用时间和行驶里程两个方面对危险部位寿命进行比较分析;结果表明,在车身连接点随机载荷谱和编制的程序载荷谱的作用下,车身的损伤分布及大小基本一致,验证程序载荷谱的有效性。所提出的编谱方法对其他车型的车身台架疲劳试验也有一定的应用和参考价值。
A compiled method of programed load spectrum is presented, which can simplify and accelerate the body fatigue bench test. Random load spectrum of the interface points between chassis and body, which is obtained accurately by road load spectrum collected on the proving ground, is simplified to torsion load spectrum. Based on rain-flow counting method and statistical theory, the distributions of amplitude and mean are found to confirm with normal distribution and Weibull distribution respectively. Following that, the programed load spectrum is compiled and simplified. The fatigue life of the body is predicted using finite element method（FEM） and fatigue analysis theory, and the critical regions are analyzed in terms of fatigue time and driving distance. Through comparative study of the simulation result of random load spectrum and programed load spectrum, the damage distribution and fatigue life are found to agree well with each other, which demonstrate the effectiveness of the presented method. The compiled method of programed load spectrum can help other vehicles to improve the performance.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第4期92-98,共7页
Journal of Mechanical Engineering
基金
国家重点基础研究发展计划(973计划
2011CB711203)
上海汽车工业科技发展基金会(SAISTDF/12-07)资助项目
关键词
车身
疲劳
载荷谱
台架试验
加速试验
body
fatigue
load spectrum
bench test
accelerated test
