装载机工作装置疲劳试验载荷谱编制方法

摘要/Abstract

摘要： 为研究装载机工作装置疲劳性能，提出了一种考虑分段载荷均值特性的工作装置疲劳试验程序载荷谱的编制方法，采集了4种典型物料铲装作业时工作装置的销轴载荷信号，并将销轴载荷转化为铲斗斗尖处的当量载荷。根据载荷特性,将每个作业周期分为空载行进、物料铲装、满载运输和物料卸载4段，完成了载荷的平稳性检验。采用雨流计数法分析各个作业段载荷的均幅值分布特性，结果表明：4个作业段的载荷均值服从正态分布，幅值服从三参数威布尔分布，且均值和幅值分布相互独立。对载荷进行频次外推和合成，并根据均幅值概率分布函数和波动中心法，编制了工作装置8级二维载荷谱和变均值疲劳试验程序加载谱。提出的载荷谱编制方法和结果可为装载机工作装置结构寿命预测及疲劳可靠性台架试验提供参考。

关键词: 装载机, 工作装置, 斗尖当量载荷, 载荷谱, 疲劳试验

Abstract: In order to study the fatigue performance of the loader working devices, a method was proposed considering the load mean characteristics for the preparation of load spectrum of fatigue test program. The loads of the pin in 4 typical material shovel loading operations were collected, and the pin loads were converted to equivalent loads at the tip of the bucket. According to the load characteristics, each operation period was divided into 4 sections, which were no load transportation, shovel digging operation, heavy load transportation and unloading operation. The rain flow counting method was adopted to analyze the mean value distributions and amplitude distributions of the 4 sectional loads. The results show that the distributions of load mean and amplitude are independent and obey normal distribution and Weibull distribution with three-parameters respectively. Frequencies were extrapolated and synthesized and the load spectrum of the 8 stage load spectrum and the variable mean fatigue test program were worked out according to the mean amplitude probability distribution function and the wave center method. The method and results of load spectrum compilation provide references for fatigue life prediction and reliability bench test of the loader working devices.

Key words: loader, working device, tip equivalent load, load spectrum, fatigue experiment

中图分类号:

TH214.3

万一品1;宋绪丁1;员征文2;郁录平1. 装载机工作装置疲劳试验载荷谱编制方法[J]. 中国机械工程.

WAN Yipin1;SONG Xuding1;YUAN Zhengwen2;YU Luping1. Compilation Method of Fatigue Experimental Load Spectrum of Loader Working Devices[J]. China Mechanical Engineering.

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