双参数载荷谱编制研究

针对农业机械工作载荷的随机性,应用概率论与数理统计原理,分析了双参数载荷谱编制时由载荷变程均值联合密度函数生成常用程序载荷谱的方法;针对农业机械作业工况的多样性,导出了多工况载荷谱合成扩展以及最大载荷推断的通用公式;应用等损伤理论,导出了由载荷累积频次曲线生成阶梯程序载荷谱时各级载荷频次计算的通用公式。

A Study on Two-parameter Load Spectrum Compilation

With an aim at solving the problem of randomization of farm machinery load, and based on the probability and statistics theory, this paper analyses the methods of working out the commonly-used programme spectrum from the joint functions of load amplitude and mean value in two-parameter spectrum formation. A general formula of composition and extension of load spectrum in different working conditions and the calculation of maximum load value is derived. Also, a formula for calculating load frequency in each step is derived by using the linear accumulated damage theory and the equal damage theory when the integrated and accumulated frequency curve yields step spectrum.