挖掘机斗杆载荷谱测试方法及其数据处理

为编制液压挖掘机斗杆载荷谱,提出了液压挖掘机斗杆载荷谱测试方法,并对某型号液压挖掘机进行现场测试试验。采集了此机型实际作业过程中典型工况和极限工况的各油缸大小腔压力以及油缸伸缩量的时间历程曲线。以挖岩工况的试验数据为对象,利用Ncode对数据进行时域分析和频域分析,并进行去除趋势项以及滤波等预处理。对挖掘机工作装置进行了受力分析,建立力系平衡方程,利用MATLAB求出斗杆各铰点受力的时间历程。斗杆各铰点受力具有周期性,不同作业段的载荷差异较大,故以作业段为单位进行平稳性和各态历经性检验。通过对数据处理结果的对比和分析,为进行载荷谱编制以及室内模拟实验做准备。

Test method and data processing for load spectrum of excavator bucket rod

To compile the load spectrum of hydraulic excavator bucket rod, the load spectrum test of hydraulic excavator bucket rod was proposed, and a kind of hydraulic excavator was tested.Then, the time history curve of cylinder pressure and cylinder lengthen and shorten in the typical working condition and ultimate working condition of the hydraulic excavator were collected.For the experimental data in digging rock conditions, the data were analyzed in time domain and frequency domain by Ncode, and the data were processed by removing trends and filtering.Furthermore, the force analysis of excavator working device was carried out, and the equations of equilibrium of force series were established.The time history curves of each hinge point force of bucket rod were obtained by the MATLAB.The hinge point force of bucket rod was periodic, and the loads of different working sections were different.Therefore, the stationary and ergodicity tests were carried out by taking the working section as a unit.Thus, the load spectrum compilation and indoor simulation experiment were prepared through the comparison and analysis of the data processing results.