某轻型履带车辆起步工况下主离合器接合过程传动轴疲劳损伤研究
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摘要
为确保履带车辆传动系统的疲劳可靠性,在车辆起步工况下对传动轴进行疲劳分析,确定了主离合器在接合过程中影响传动系统产生疲劳损伤的主要因素。建立车辆起步阶段动力学模型,获得整车传动系统载荷与主离合器接合位移关系。搭建履带车辆动态转矩测试平台,获取典型工况任务下传动系统试验数据。设计典型工况下主离合器的步进接合动态测试试验,采集传动系统在主离合器接合过程中传递的转矩数据。采用雨流计数法和雨流滤波法对原始数据进行处理,应用线性疲劳累计损伤理论,对主离合器在不同接合位移时的传动系统传动轴进行疲劳损伤计算,确定传动系统产生最大疲劳损伤时对应主离合器的接合状态。研究结果表明,主离合器接合过程中从动盘轴向移动速率变化最大的位移点是传动轴产生最大疲劳损伤的危险点,占全部接合过程总损伤的73.86%,损伤程度为接合过程中主离合器同步状态的2.87倍。
This paper tries to figure out the fatigue damage of transmission shaft of transmission system caused by the engagement of main clutch under typical operating conditions,and then analyze the main factors causing the fatigue damage of transmission system. A dynamic model of vehicle starting is built to obtain the relationship between the vehicle transmission system load and the engagement displacement value of main clutch. A testing platform of tracked vehicle is built to get the test data of transmission system under typical operating conditions. The dynamic tests of stepper engagement of main clutch are designed to collect the torque data transmitted by the transmission system in the process of main clutch engagement. Finally,the rain-flow counting method and rain-flow filtering method are used to process the original data,and then the linear fatigue cumulative damage theory is used to calculate the fatigue damage of transmission shaft in transmission system to determine the engaging state of main clutch when the maxi-mum fatigue damage is caused to the transmission system. The results show that the displacement point at which the axial moving speed of the driven plate changes the most is the danger point when the maximum fatigue damage is caused to the transmission shaft,which is accounted for 73. 86% of the total damage,and the damage degree is 2. 87 times of the main clutch fully synchronized state.
This paper tries to figure out the fatigue damage of transmission shaft of transmission system caused by the engagement of main clutch under typical operating conditions,and then analyze the main factors causing the fatigue damage of transmission system. A dynamic model of vehicle starting is built to obtain the relationship between the vehicle transmission system load and the engagement displacement value of main clutch. A testing platform of tracked vehicle is built to get the test data of transmission system under typical operating conditions. The dynamic tests of stepper engagement of main clutch are designed to collect the torque data transmitted by the transmission system in the process of main clutch engagement. Finally,the rain-flow counting method and rain-flow filtering method are used to process the original data,and then the linear fatigue cumulative damage theory is used to calculate the fatigue damage of transmission shaft in transmission system to determine the engaging state of main clutch when the maxi-mum fatigue damage is caused to the transmission system. The results show that the displacement point at which the axial moving speed of the driven plate changes the most is the danger point when the maximum fatigue damage is caused to the transmission shaft,which is accounted for 73. 86% of the total damage,and the damage degree is 2. 87 times of the main clutch fully synchronized state.
引文
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[13]Glielmo L,Iannelli L,Vacca V,et al.Gearshift control for automated manual transmissions[J].IEEE/ASME Transactions on Mechatronics,2006,11(1):17-26.
[2]王洪亮,刘海鸥.AMT车辆主离合器自动控制策略优化[J].南京理工大学学报,2013,37(5):729-734.WANG Hong-liang.LIU Hai-ou.Optimal control strategy of clutch for vehicles with AMT[J].Journal of Nanjing University of Science and Technology,2013,37(5):729-734.(in Chinese)
[3]Yu J W,Zheng S L,Feng J Z.New methodology for determination of load spectra for the vehicle accelerated durability testing associated with the time correlated fatigue damage analysis method[J].International Journal of Automotive Technology,2017,18(3):547-560.
[4]安东诺夫.军用履带车辆传动装置[M].王红岩,芮强,高连华,等,译.北京:国防工业出版社,2014.AntonovВМ.Трансмиссиивоенныхгусеничныхмашин[M].WANG Hong-yan,RUI Qiang,GAO Lian-hua,et al,translated.Beijing:National Defense Industry Press,2014.(in Chinese)
[5]Zhao D,Liu S G,Xu Q T.Fatigue life prediction of wire rope based on stress field intensity method[J].Engineering Failure Analysis,2017,81:1-9.
[6]Gates N R,Fatemi A,Iyyer N,et al.Fatigue crack growth behavior under multiaxial variable amplitude loading[J].Frattura ed IntegritàStrutturale,2016,10(37):166-172.
[7]Xiong J J,Shenoi R A.A load history generation approach for full-scale accelerated fatigue tests[J].Engineering Fracture Mechanics,2008,75(10):3226-3243.
[8]Lee Y L,Pan J,Hathaway R.Fatigue testing and analysis:theory and practice[M].London:Butterworth-Heinemann,2005:89-95.
[9]林晓华,席军强.干式离合器摩擦转矩两种估计模型的对比[J].汽车工程,2017,39(3):317-322.LIN Xiao-hua,XI Jun-qiang.Comparison between two estimation models for the friction torque of dry clutch[J].Automotive Engineering,2017,39(3):317-322.(in Chinese)
[10]王望予.汽车设计[M].北京:机械工业出版社,2013:58-59,63-64.WANG Wang-yu.Automotive design[M].Beijing:China Machine Press,2013:58-59,63-64.(in Chinese)
[11]张国鑫.某履带车辆传动系统动态扭矩测试与数据预处理[D].北京:北京理工大学,2016:64-69.ZHANG Guo-xin.Testing and data preprocessing of dynamic torque for tracked vehicle transmission system[D].Beijing:Beijing Institute of Technology,2016:64-69.(in Chinese)
[12]于佳伟,郑松林,赵礼辉,等.整车室内道路模拟试验用载荷谱的编制方法研究[J].机械工程学报,2015,51(14):93-99.YU Jia-wei,ZHENG Song-lin,ZHAO Li-hui,et al.Research on spectrum development methodology for vehicle indoor road simulation test[J].Journal of Mechanical Engineering,2015,51(14):93-99.(in Chinese)
[13]Glielmo L,Iannelli L,Vacca V,et al.Gearshift control for automated manual transmissions[J].IEEE/ASME Transactions on Mechatronics,2006,11(1):17-26.