摘要
研究了小波阈值降噪技术的原理与方法,分析降噪效果的评价指标。分别采用4种阈值法则,对某轿车在襄樊试验场铺设路面上测得的车轮垂向力信号进行降噪处理;并设定新的降噪效果评价指标,结合降噪后信号的时域和频域特点,对不同阈值法则降噪处理后的信号进行对比,结果发现采用极小极大准则阈值法则对车轮垂向力信号的降噪处理结果更为准确可靠。
The principle and the method of the wavelet-threshold de-noising technology are studied, and the evaluating indicators are analyzed in detail. The signal of wheel vertical force is de-noised by using four kinds of threshold methods, which is collected in the paved road of Xiangfan proving ground, Then combined with the time and frequency domain characters a new assessment index is set.The results of different threshold methods are compared. It is found that the result based on the Minimax principle is more accurate and reliable.
出处
《汽车科技》
2011年第1期44-47,共4页
Auto Sci-Tech
关键词
小波分析
降噪
阈值法则
评价指标
车轮垂向力
Wavelet analysis
De-noise
Threshold principle
Evaluating indicator
Wheel vertical force
