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

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