装载机工作装置疲劳试验载荷谱编制方法

发布时间：2018-08-22 18:26

【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。
[Abstract]:In order to study the fatigue performance of the working device of the loader, a method of compiling the load spectrum of the fatigue test program of the working device considering the average characteristic of the piecewise load is proposed, and the load signals of the pin shaft of the working device during the loading of the shovel of four typical materials are collected. The pin shaft load is transformed into the equivalent load at the tip of the bucket. According to the load characteristics, each operation cycle is divided into four sections: no-load travel, material shovel, full load transportation and material unloading, and the load stability test is completed. The average amplitude distribution of loads in each section is analyzed by rain flow counting method. The results show that the mean value of load in four sections is normal distribution, and the amplitude distribution is from three parameters Weibull distribution, and the mean value and amplitude distribution are independent of each other. According to the probability distribution function of average amplitude and the method of wave center, two dimensional load spectrum and the loading spectrum of variable mean value fatigue test program are compiled. The proposed method and results can provide a reference for the structural life prediction and fatigue reliability test of the loader working device.
【作者单位】：长安大学道路施工技术与装备教育部重点实验室;徐工集团江苏徐州工程机械研究院;
【基金】：国家科技支撑计划资助项目(2015BAF07B02) 中央高校基本科研业务费资助项目(310825175009,310825163407)
【分类号】：TH243

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