基于短时傅里叶变换的汽车零部件耐久性载荷信号编辑方法
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摘要
为了保证汽车零部件耐久性试验能够真实复现零件的服役载荷,并将试验场所测得的实际载荷-时间历程信号编辑成有效的缩减载荷信号,提出基于短时傅里叶变换的汽车零部件载荷信号编辑方法。对零件载荷信号进行短时傅里叶变换,得到该载荷信号的累积功率谱密度。利用累积功率谱密度来识别并提取损伤贡献大的片段,得到零件的缩减载荷信号。以汽车动力总成后拉杆悬置载荷-时间历程信号为例,采用基于短时傅里叶变换和基于损伤保留两种方法来编辑载荷信号。结果表明,在伪损伤保持一致的前提下,相比基于损伤保留方法,基于短时傅里叶变换方法得到的缩减载荷信号时间长度更短,且在统计参数(均值、方均根与峰度系数)和信号幅值域等方面均与原始载荷信号一致性更高。应用该缩减载荷信号建立汽车动力总成后拉杆悬置的耐久性台架试验,验证该套方法的有效性。
In order to ensure the durability test of the vehicle component reflects service loads actually and the compression load signal is effective, a method of editing the load signal of vehicle components based on short time Fourier transform is proposed. The accumulative power spectral density of the original load signal is obtained by short-time Fourier transform. The accumulative power spectral density is used to identify and extract the damage parts from the original load signal, and a compression load signal is created.Based on the load signal of the engine mount, this method and the damage retention method are applied to edit the load signal. The results show that, the compression load signal based on short-time Fourier transform with a shorter length of time contain almost same damage of the original load signal, and it has similar statistical parameters including mean value, root mean square and kurtosis as well as the amplitude domain of the original load signal. The engine mount bench iteration test is established by using the compression load signal, and the effectiveness of the method is verified.
In order to ensure the durability test of the vehicle component reflects service loads actually and the compression load signal is effective, a method of editing the load signal of vehicle components based on short time Fourier transform is proposed. The accumulative power spectral density of the original load signal is obtained by short-time Fourier transform. The accumulative power spectral density is used to identify and extract the damage parts from the original load signal, and a compression load signal is created.Based on the load signal of the engine mount, this method and the damage retention method are applied to edit the load signal. The results show that, the compression load signal based on short-time Fourier transform with a shorter length of time contain almost same damage of the original load signal, and it has similar statistical parameters including mean value, root mean square and kurtosis as well as the amplitude domain of the original load signal. The engine mount bench iteration test is established by using the compression load signal, and the effectiveness of the method is verified.
引文
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[19]花菲菲,郑松林,冯金芝,等.基于时域损伤编辑法的整车道路模拟试验谱编制[J].机械强度,2015,37(5):964-971.HUA Feifei,ZHENG Songlin,FENG Jinzi,et al.Spectrum compilation for vehicle road simulation test based on time correlated fatigue analysis with damage editing method[J].Journal of Mechanical Strength,2015,37(5):964-971.
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[2]LEDESMA R,JENAWAY L,WANG Y,et al.Development of accelerated durability tests for commercial vehicle suspension components[R].SAE,2005-01-3565,2005.
[3]LIN K Y,HWANG J R,CHANG J M.Accelerated durability assessment of motorcycle components in real-time simulation testing[J].Proceedings of the Institution of Mechanical Engineers,Part D:Journal of Automobile Engineering,2010,224(2):245-259.
[4]MATTETTI M,MOLARI G,VERTUA A.New methodology for accelerating the four-post testing of tractors using wheel hub displacements[J].Biosystems Engineering,2015(129):307-314.
[5]芦勇,段小成,徐驰,等.汽车副车架衬套道路载荷信号缩减应用研究[J].汽车技术,2013(9):56-60.LU Yong,DUAN Xiaocheng,XU Chi,et al.Research on road load spectrum reduction for vehicle sub-frame lining[J].Automobile Technology,2013(9):56-60.
[6]上官文斌,谢新星,丁维,等.汽车动力总成悬置耐久性模拟试验研究[J].振动与冲击,2011,30(10):39-44.SHANGGUAN Wenbin,XIE Xinxing,DING Wei,et al.Road simulation test for automobile powertrain durability[J].Journal of Vibration and Shock,2011,30(10):39-44.
[7]PRATUMNOPHARAT P,LEUNG P S,COURT R S.Extracting fatigue damage parts from the stress-time history of horizontal axis wind turbine blades[J].Renewable Energy,2013,58:115-126.
[8]ABDULLAH S,NIZWANC K E,NUAWI M Z.A study of fatigue data editing using the short-time Fourier transform(STFT)[J].American Journal of Applied Sciences,2009,6(4):565.
[9]ABDULLAH S,PUTRA T E,NUAWI M Z,et al.Time-frequency localization analysis for extracting fatigue damaging events[J].ISPRA,2010(10):3.
[10]ABDULLAH S,NIZWANC K E,NUAWI M Z,et al.The applicability of the short-time Fourier transform(STFT)for fatigue data editing[M].[S.l.],World Scientific and Engineering Academy and Society(WSEAS),2007.
[11]CHUNG-SEOG O.Application of wavelet transform in fatigue history editing[J].International Journal of Fatigue,2001(23):241-250.
[12]ABDULLAH S,GIACOMIN J A,YATES J R.A mission synthesis algorithm for fatigue damage analysis[J].Proc.IMech E,Part D:Journal of Automobile Engineering,2004(218):243-257.
[13]郑国峰,上官文斌,韩鹏飞,等.基于小波变换的汽车零部件加速耐久性载荷信号编辑方法研究[J].机械工程学报,2017,53(8):124-131.ZHENG Guofeng,SHANGGUAN Wenbin,HANPengfei,et al.Study of load spectrum edition method based on the wavelet transform to the accelerated durability test of the vehicle component[J].Journal of Mechanical Engineering,2017,53(8):124-131.
[14]PADZI M M,ABDULLAH S,NUAWI M Z,et al.Evaluating ultrasound signals of carbon steel fatigue testing using signal analysis approaches[J].Journal of Central South University,2014,21(1):232-241.
[15]李文礼,石晓辉,柯坚,等.关联用户的汽车传动系载荷信号室内台架试验编制方法[J].机械工程学报,2014,50(20):143-150.LI Wenli,SHI Xiaohui,KE Jian,et al.Weave method study of customer correlated load spectrum for driveline durability indoor test[J].Journal of Mechanical Engineering,2014,50(20):143-150.
[16]于佳伟,郑松林,赵礼辉,等.整车室内道路模拟试验用载荷信号的编制方法研究[J].机械工程学报,2015,51(14):93-99.YU Jiawei,ZHENG Songlin,ZHAO Lihui,et al.Research on spectrum development methodology for the vehicle indoor road simulation test[J].Journal of Mechanical Engineering,2015,51(14):93-99.
[17]钱立军,吴道俊,杨年炯,等.基于室内道路模拟技术的整车加速耐久性试验的研究[J].汽车工程,2011,33(2):91-96.QIAN Lijun,WU Daojun,YANG Nianjiong,et al.Aresearch on vehicle accelerated durability test based on indoor road simulation technology[J].Automobile Engineering,2011,33(2):91-96.
[18]郑松林,周亚捷,冯金芝,等.一种新的考虑伪损伤保留的道路载荷模拟试验加速方法[J].机械强度,2017(2):410-416.ZHENG Songlin,ZHOU Yajie,FENG Jinzhi,et al.A new spectrum development methodology based on pseudo damage reserving for road load simulation test[J].Journal of Mechanical Strength,2017(2):410-416.
[19]花菲菲,郑松林,冯金芝,等.基于时域损伤编辑法的整车道路模拟试验谱编制[J].机械强度,2015,37(5):964-971.HUA Feifei,ZHENG Songlin,FENG Jinzi,et al.Spectrum compilation for vehicle road simulation test based on time correlated fatigue analysis with damage editing method[J].Journal of Mechanical Strength,2015,37(5):964-971.
[20]于佳伟,郑松林,赵子顺,等.一种新的加速耐久性试验谱编制方法[J].机械强度,2016,38(2):356-363.YU Jiawei,ZHENG Songlin,ZHAO Zi Shun,et al.A new spectrum development methodology for accelerated durability test[J].Journal of Mechanical Strength,2016,38(2):356-363.
[21]SHAFIULLAH A K M,WU C Q.Generation and validation of loading profiles for highly accelerated durability tests of ground vehicle components[J].Engineering Failure Analysis,2013,33(5):1-16.