基于时域损伤编辑法的整车道路模拟试验谱编制
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摘要
整车道路模拟试验需要真实再现车辆的服役载荷,传统的载荷谱编制方法已无法满足其对试验谱的要求,因此急需采用一种能完好保留服役载荷特征的试验谱编制方法。通过分析比较几种常用的编谱方法,发现时域损伤编辑法可在完好保留服役载荷各项特征(幅值、频率、加载次序和多通道相位)的同时,实现试验时间的缩短,是适用于道路模拟试验的一种有效的编谱方法。以某轿车试验场实测载荷谱为基础,应用该方法生成了试验加速谱。从幅值域和频率域对加速谱的有效性和合理性进行了理论验证,发现加速谱在缩短试验时间的同时,完好保留了原始载荷谱的损伤值和各项特征。最后,应用该试验谱建立了整车耐久性台架试验,试验结果与汽车试验场试验相一致,进一步验证了该方法的正确性。
Vehicle road simulation test should reflect the vehicle service loads actually,traditional load spectrum compilation methods were unable to meet the requirements of road simulation test.Therefore it is necessary to apply a load spectrum compiling method which can retain characteristic of the service load.In this paper,Several kinds of load spectrum compiling methods are compared and analysized,and time correlated fatigue analysis with damage editing method is considered to be the most effective,because it can maintain all the properties of service load( amplitude,frequency,loading sequence and multi-channel phase) over an accelerated time.Based on proving ground collected loading spectrum of the test vehicle,this method was applied to generate test spectrum.The effectiveness and validity of the accelerated spectrum were verified theoretically from amplitude domain and frequency domain.The results have shown that the test time of the accelerated spectrum was significantly reduced while simultaneously the damage value and properties of the original spectrum were well maintained.Finally,vehicle bench durability test was conducted,and the same test results have been acquired as those of field test.The validness of this methodology was demonstrated.
Vehicle road simulation test should reflect the vehicle service loads actually,traditional load spectrum compilation methods were unable to meet the requirements of road simulation test.Therefore it is necessary to apply a load spectrum compiling method which can retain characteristic of the service load.In this paper,Several kinds of load spectrum compiling methods are compared and analysized,and time correlated fatigue analysis with damage editing method is considered to be the most effective,because it can maintain all the properties of service load( amplitude,frequency,loading sequence and multi-channel phase) over an accelerated time.Based on proving ground collected loading spectrum of the test vehicle,this method was applied to generate test spectrum.The effectiveness and validity of the accelerated spectrum were verified theoretically from amplitude domain and frequency domain.The results have shown that the test time of the accelerated spectrum was significantly reduced while simultaneously the damage value and properties of the original spectrum were well maintained.Finally,vehicle bench durability test was conducted,and the same test results have been acquired as those of field test.The validness of this methodology was demonstrated.
引文
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[12]Biot M A.Theory of elastic systems vibrating under transient impulse,with an application to earthquake-proof buildings[C].Proceedings of the National Academy of Science,1933,19(2):262-268.
[2]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谱耐久性试验的研究[J].汽车工程,2011,33(2):91-96.QIAN Li Jun,WU Dao Jun,YANG Nian Jiong,et al.A research on vehicle accelerated durability test based on indoor road simulation technology[J].Automotive Engineering,2011,33(2),91-96(In Chinese).
[3]Heuler P,Klatschke H.Generation and use of standardized load spectra and load-time histories[J].International Journal of Fatigue,2005,27:974-990.
[4]王铁,赵富强,张瑞亮,等.变速器加速疲劳试验方法分析[J].汽车工程,2013,35(12):1078-1083.WANG Tie,ZHAO Fu Qiang,ZHANG Rui Liang,et al.An analysis on accelerated fatigue test method for transmissions[J].Automotive Engineering,2013,35(12),1078-1083(In Chinese).
[5]Jacoby G H.Modified linear damage accumulation hypothesis accounting for a decreasing fatigue strength during increasing fatigue damage[C].Effects of Environmental and Complex Load History on Fatigue Life.ASTM TP 462,1970:184-202.
[6]Halfpenny A.Method for accelerating dynamic durability tests[C].Proceeding of the 9th International Conference on Recent Advances in Structural Dynamics,Southampton,UK,2006:18-36.
[7]Lee Y L,Pan J,Hathaway R B,et al.Fatigue testing and analysis(Theory and Practice)[M].Burlington:Elsevier utterworthHeinemann,2005:130-138.
[8]Haibach E.Modified linear damage accumulation hypothesis accounting for a decreasing fatigue strength during increasing fatigue damage[R].Laboratorium fur Betriebsfestigkeit,LBF,Darmstadt,TM Nr.50,1970(in German).
[9]高云凯,徐成民,方剑光.车身台架疲劳试验程序载荷谱研究[J].机械工程学报,2014,50(4):92-98.GAO Yun Kai,XU Cheng Min,FANG Jian Guang.Study on the Programed Load Spectrum of the Body Fatigue Bench Test[J].Journal of Mechanical Engineering,2014,50(4):92-98(In Chinese).
[10]郑松林,梁国清,王治瑞,等.考虑低幅锻炼载荷的某轿车摆臂载荷谱编制[J].机械工程学报,2014,50(16):147-154.ZHENG Song Lin,LIANG Guo Qing,WANG ZhiRui,et al.Compilation of automotive lower control arm spectrum based on the low-amplitude training load[J].Journal of Mechanical Engineering,2014,50(16):147-154(In Chinese).
[11]张英爽,王国强,王继新,等.工程车辆传动系载荷谱编制方法[J].农业工程学报,2011,27(4):179-183.ZHANG Ying Shuang,WANG Guo Qiang,WANG Ji Xin,et al.Compilation method of power train load spectrum of engineering vehicle[J].Transactions of the CSAE,2011,27(4):179-183(In Chinese).
[12]Biot M A.Theory of elastic systems vibrating under transient impulse,with an application to earthquake-proof buildings[C].Proceedings of the National Academy of Science,1933,19(2):262-268.