现代制造工程
現代製造工程
현대제조공정
MODERN MANUFACTURING ENGINEERING
2015年
4期
33-37
,共5页
凸轮轴轴承%松脱%小波包分解%解调%故障特征
凸輪軸軸承%鬆脫%小波包分解%解調%故障特徵
철륜축축승%송탈%소파포분해%해조%고장특정
camshaft bearing%loosening%wavelet packet decomposition%demodulation%fault feature
车用发动机凸轮轴轴承松脱故障使得凸轮轴受力不均而引起冲击力，导致凸轮轴附近机体表面出现异常振动和显著噪声。通过对某发动机凸轮轴轴承松脱故障的试验测试，提取缸盖振动加速度信号进行时域分析，发现有明显的周期性冲击；利用小波包分解至较高频段并做解调分析，解调谱的故障激励频率非常显著。分析结果表明，凸轮轴轴承松脱故障有中高频调制现象，可综合利用时域分析、频谱分析和小波包分解与解调分析进行相应的故障特征提取。
車用髮動機凸輪軸軸承鬆脫故障使得凸輪軸受力不均而引起遲擊力，導緻凸輪軸附近機體錶麵齣現異常振動和顯著譟聲。通過對某髮動機凸輪軸軸承鬆脫故障的試驗測試，提取缸蓋振動加速度信號進行時域分析，髮現有明顯的週期性遲擊；利用小波包分解至較高頻段併做解調分析，解調譜的故障激勵頻率非常顯著。分析結果錶明，凸輪軸軸承鬆脫故障有中高頻調製現象，可綜閤利用時域分析、頻譜分析和小波包分解與解調分析進行相應的故障特徵提取。
차용발동궤철륜축축승송탈고장사득철륜축수력불균이인기충격력，도치철륜축부근궤체표면출현이상진동화현저조성。통과대모발동궤철륜축축승송탈고장적시험측시，제취항개진동가속도신호진행시역분석，발현유명현적주기성충격；이용소파포분해지교고빈단병주해조분석，해조보적고장격려빈솔비상현저。분석결과표명，철륜축축승송탈고장유중고빈조제현상，가종합이용시역분석、빈보분석화소파포분해여해조분석진행상응적고장특정제취。
Automotive engine camshaft bearing loosening fault will cause impact force because of uneven stress on camshaft , so abnormal vibration and noise appear on the body surface near the camshaft .By the test for engine camshaft bearing loosening fault,vibration acceleration signal of cylinder head is collected to analyze in time domain ,cyclical shock can be seen .Then wave-let packet decomposition method is used to decompose the signal and demodulation analysis is applied to higher frequency band signal,fault excitation frequency in the demodulation spectrum is very obvious .The analysis result shows that camshaft bearing loosening fault would cause mid-high frequency modulation phenomenon ,it could extract the corresponding fault feature by com-positely using time domain analysis ,frequency spectrum analysis and wavelet packer decomposition and demodulation analysis .
