装载机连杆载荷测试与载荷谱编制方法研究

为了研究装载机连杆载荷与疲劳可靠性试验所需载荷谱特性,提出一种连杆载荷测试与载荷谱编制方法。设计连杆力测试传感器,在大石方、黏土、砂子和小石方4种物料工况下进行连杆载荷测试试验。利用峰谷抽取和小波处理实现了实测数据的压缩编辑,通过雨流计数获得了合成工况下连杆载荷均值频次和幅值频次分别服从正态分布和三参数威布尔分布的拟合数学模型,且载荷均值分布和幅值分布相互独立,编制了连杆二维载荷谱和疲劳试验程序谱,为连杆结构疲劳可靠性分析提供依据。

RESEARCH ON LOAD TEST AND SPECTRUM COMPILATION METHOD OF LOADER CONNECTING ROD

In order to study the load test and load spectrum for fatigue reliability test of loader connecting rod, a method of connecting rod load test and load spectrum is presented. A kind of sensor is designed to measure the force of the connecting rod. The test experiment was carried out in primary stone, clay, sand and small stone under the conditions of these 4 kinds of material. By using the method of peak valley extraction and wavelet processing, the compression of the measured data is realized. By means of rain flow counting, the relationship between the mean frequency and amplitude frequency of the connecting rod load is obtained under the condition of synthesis, and they are subject to the normal distribution and three parameter Weibull distributions, and the load distribution of the mean value and amplitude distribution are independent of each other. The two-dimensional load spectrum and fatigue test program spectrum of the connecting rod are established, which can provide the basis for the reliability test and anti fatigue design of connecting rod structure.