基于小波分析的滚柱直线导轨副摩擦力波动分析

Friction Force Fluctuation Analysis of Roller Type Linear Guideways Based on Wavelet Analysis

滚柱直线导轨摩擦力的波动对滚柱直线导轨的可靠性和稳定性有着重要影响。对采集的摩擦力信号进行多尺度小波变换,再经Hilbert变换和快速傅里叶变换,得到各尺度的频谱。结合滚柱直线导轨的结构及运行特征建立摩擦力数学模型。通过对实验数据与理论模型的对比,证明数学模型的合理性,分析得出承载滚柱数目的变化是滚柱直线导轨摩擦力产生波动的主要原因。

The friction force fluctuation of roller linear guide has important influence on the reliability and stability of the linear guide. Multi-scale wavelet transformation was used in processing the acquired friction signal. Then frequency spectrum of each scale can be obtained,through Hillbert transformation and Fast Fourier transformation（ FFT）. With structure and operating characteristics of roller linear guide,the friction model was established. The friction model was proved to be reasonable,through the comparison of the experimental data and theoretical model. At last it was found that the main reason of friction force fluctuations was the change in the number of bearing roller.