Abstract:

In order to guide the reliability design on the wheel loaders,a method of compiling load spectrum on wheel loader transmission was proposed.Load signals of the wheel loader transmission were tested by using five-fragment method.The load signal frequency characteristics are less than 1Hz by frequency spectrum analysis.Accordance with the four fragments of  “empty load,shovel load,full load and unload” cycling characteristics,the load signals were processed smoothly by splitting and merging them.Through the rain-flow counting,it is concluded that mean load is fit to the normal distribution and load amplitude is fit to the Weibull distribution.And by synthesis conditions,the statistical extreme value of load amplitude was inferred.By using the wave center method,the eight load spectrum and the program load spectrum of the wheel loaders transmission parts were
compiled.It is concluded that wheel loader transmission load signals can be dealt
with four paragraphs smoothly according to significant characteristics,and probability
distribution characteristics are clear.The load spectrum is consistent with
loader real work conditions.

Key words: wheel loader, transmission load, load spectrum, rain-flow counting, synthesis conditions method

摘要：

为指导轮式装载机可靠性设计，提出一种轮式装载机传动系载荷谱编制方法。采用“五段法”测试了轮式装载机传动系载荷时间历程信号;通过频谱分析，确定载荷信号频率不超过1Hz的特征;按照“空载运行-铲掘装载-满载运行-卸载”四段的循环特征，对信号进行分割与合并，完成信号的平稳处理;通过雨流计数与工况合成法，获得载荷均值符合正态分布、幅值符合威布尔分布的特征，完成载荷幅值极值的统计推断;根据波动中心法，编制出了轮式装载机传动系各部件的八级载荷谱与程序加载谱。研究表明，轮式装载机传动系载荷信号可依特征分四段平稳处理，且具有显著的概率分布特征，编制的载荷谱符合装载机真实工况。
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关键词: 轮式装载机, 传动系载荷, 载荷谱, 雨流计数法, 工况合成法