开展基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法的研究。提出一种修正重采样的载荷谱预处理方法，该方法能够消除重采样因峰谷值漏采带来的信号损伤计算误差。将预处理后的零件载荷谱进行小波分解，分解后的高频小波系数进行重构得到高频小波分量，基于高频小波分量，利用包络线损伤成分识别方法，提取出原始信号中对零件损伤有较大贡献的部分，得到零件的编辑载荷谱。基于小波变换的多轴载荷谱编辑方法得到的压缩信号，在伪损伤保留量、统计参数、穿级计数分析及功率谱密度等方面均与原始信号有较好的一致性，并且没有改变通道之间的相位关系，可以达到与原始信号相同的加载效果。通过控制臂的疲劳仿真计算，进一步验证编辑载荷谱与原始载荷谱具有相同的加载效果。该编辑方法可用于汽车零部件的加速耐久性试验研究中。
郑国峰
,
上官文斌
,
韩鹏飞
,
AHMED Waizuddin
. 基于小波变换的汽车零部件加速耐久性多轴载荷谱编辑方法研究[J]. 机械工程学报, 2018
, 54(10)
: 156
-166
.
DOI: 10.3901/JME.2018.10.156
The multi-axis load spectrum edition based on the wavelet transform to the vehicle component accelerated durability test is introduced. And a modified resampling method is proposed to preprocess the acquisited load spectrum. Some peak and valley points of the load spectrum are ignored in the general resampling method. And these neglecting points will lead to the damage calculation error of the load spectrum. The modified resampling method eliminates the error of damage calculation through reassign the neglected peak and valley points. After the resampling, wavelet decomposition is conducted to the load spectrum. The high frequency wavelet component is obtained by the load spectrum wavelet transformation. And the envelope damage identification method is used to identify the damage contribution parts of the load spectrum by setting a threshold value to the high frequency wavelet component. The shorten load spectrum is obtained by organizing the most the damage contribution parts identified before. The edition load spectrum based on the wavelet transform edition method has the similar parameters including pseudo-damage, mean value, root mean square and kurtosis as well as the energy to the original spectrum. It is illustrated that the edited load spectrum has the same effect to the original one. The proposed load spectrum edition method can be used in the accelerated durability test research of all the vehicle components.
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