动力总成悬置系统隔振率的计算方法
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摘要
基于动力总成为刚体的假设,根据A车型悬上、悬下点的加速度的实测值,建立了动力总成激励力的识别方法。由动力总成激励力计算结果,和悬下点IPI数据,给出了悬上、悬下点加速度和悬置的隔振率的计算方法。B车型的动力总成与A车型相同,但悬置系统与车身不同。由建立的模型计算了B车型悬置系统悬上点加速度,与实测值进行了对比分析,证明了动力总成激励力识别模型的有效性。利用识别的动力总成激励力,和测试得到的B车型悬下点的IPI参数,计算得到了B车型各个悬置的隔振率,与实测结果的对比分析证明了该研究建立的悬置隔振率计算方法的有效性。该研究识别得到的动力总成的激励力,可以用于评价动力总成振动。根据动力总成的激励力和悬下点的IPI参数,计算得到的悬置的隔振率,为悬置系统的优化设计提供了分析方法。
Models and methods for calculating the isolation rate of mounts in a powertrain mounting system(PMS) were discussed. For verification, two cars, car A and car B were taken as tested objects. For car A, a model for identifying the excitation forces of its powertrain was proposed with the assumption of taking the powertrain as a rigid body, based on the measured accelerations at the upper and under mounting points where the mount was connected with the powertrain and car body respectively. Then, a method for estimating the isolation rate of the mount in the PMS was developed by using the identified excitation forces and the input point inertance at the under comnection point. The powertrain installed in car B is the same as that of car A, but the body, mount locations and stiffness of car B are different from that of car A. For car B, the accelerations at the upper connection point were calculated, and compared with the experimental results, which validates the model for powertrain excitation force identification. Also, by comparing the estimated and measured isolation rates of the mount of car B validates the calculation methods for mount isolation rates developed in the paper. The identified excitation forces can be used for evaluating the vibrations of powertrain, and the calculated isolation rate can be used for optimizing powertrain mounting system designs.
Models and methods for calculating the isolation rate of mounts in a powertrain mounting system(PMS) were discussed. For verification, two cars, car A and car B were taken as tested objects. For car A, a model for identifying the excitation forces of its powertrain was proposed with the assumption of taking the powertrain as a rigid body, based on the measured accelerations at the upper and under mounting points where the mount was connected with the powertrain and car body respectively. Then, a method for estimating the isolation rate of the mount in the PMS was developed by using the identified excitation forces and the input point inertance at the under comnection point. The powertrain installed in car B is the same as that of car A, but the body, mount locations and stiffness of car B are different from that of car A. For car B, the accelerations at the upper connection point were calculated, and compared with the experimental results, which validates the model for powertrain excitation force identification. Also, by comparing the estimated and measured isolation rates of the mount of car B validates the calculation methods for mount isolation rates developed in the paper. The identified excitation forces can be used for evaluating the vibrations of powertrain, and the calculated isolation rate can be used for optimizing powertrain mounting system designs.
引文
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[12]上官文斌,徐驰,黄振磊,等.汽车动力总成悬置系统位移控制设计计算方法[J].汽车工程,2006,28(8):738-742.SHANGGUAN Wenbin,XU Chi,HUANG Zhenlei,et al.Design of motion control for automotive powertrain mounting systems[J].Automotive Engineering,2006,28(8):738-742.
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[15]CHOI H G,THITE A N,THOMPSON D J.Comparison of methods for parameter selection in Tikhonov regularization with application to inverse force determination[J].Journal of Sound and Vibration,2007,304(3/4/5):894-917.
[2]郑玲,刘巧斌,犹佐龙,等.汽车发动机半主动悬置多目标结构优化设计[J].振动与冲击,2017,36(24):250-255.ZHENG Ling,LIU Qiaobin,YOU Zoulong,et al.Multiobjective optimization design for semi-active mount of vehicle’s engine[J].Journal of Vibration and Shock,2017,36(24):250-255.
[3]TAO J S,LIU G R,LAM K Y.Excitation force identification of an engine with velocity data at mounting points[J].Journal of Sound and Vibration,2001,242(2):321-331.
[4]上官文斌,蒋学锋.发动机悬置系统的优化设计[J].汽车工程,1992,14:103-110.SHANGGUAN Wenbin,JIANG Xuefeng.Optimal design of engine mounting system[J].Automotive Engineering,1992,14:103-110.
[5]庄伟超,王良模,殷召平,等.基于遗传算法的混合动力汽车动力总成悬置系统的优化设计研究[J].振动与冲击,2015,34(8):209-213.ZHUANG Weichao,WANG Liangmo,YIN Zhaoping,et al.Optimization design for powertrain mounting system of a hybrid electric via genetic algorithm[J].Journal of Vibration and Shock,2015,34(8):209-213.
[6]严小俊,蒋伟康,曹诚.基于遗传模拟退火算法的汽车动力总成悬置系统优化设计[J].振动与冲击,2014,33(23):155-159.YAN Xiaojun,JIANG Weikang,CAO Cheng.Vibration isolation optimization of a vehicle powertrain mounting system based on simulated annealing and genetic algorithm[J].Journal of Vibration and Shock,2014,33(23):155-159.
[7]TAO J S,LIU G R,LAM K Y.Design optimization of marine engine-mount system[J].Journal of Sound and Vibration,2000,235(3):477-494.
[8]杨志坚,丁康,徐传燕.基于离散频谱校正的发动机激励力识别方法仿真研究[J].振动工程学报,2010,23(6):660-664.YANG Zhijian,DING Kang,XU Chuanyan.Simulation of engine excitation force identification based on discrete spectrum correction[J].Journal of Vibration Engineering,2010,23(6):660-664.
[9]庞剑.汽车车身噪声与振动控制[M].北京:机械工业出版社,2015.
[10]上官文斌,黄天平,徐驰,等.汽车动力总成悬置系统振动控制设计计算方法研究[J].振动工程学报,2007,20(6):577-583.SHANGGUAN Wenbin,HUANG Tianping,XU Chi,et al.Calculation methods for the vibration control design of a powertrain mounting system[J].Journal of Vibration Engineering,2007,20(6):577-583.
[11]DAI H X,JIANG W K,HUANG Y Y.Research on the optimal design of engine mounts by minimizing transfer power based on identifying excitation and admittance matrix[J].SAE Technical Paper,2015,8(3):904-909.
[12]上官文斌,徐驰,黄振磊,等.汽车动力总成悬置系统位移控制设计计算方法[J].汽车工程,2006,28(8):738-742.SHANGGUAN Wenbin,XU Chi,HUANG Zhenlei,et al.Design of motion control for automotive powertrain mounting systems[J].Automotive Engineering,2006,28(8):738-742.
[13]SHANGGUAN W B,CHEN D M.A method for calculating the displacements of a powertrain and mounts in a powertrain mounting system including torque struts under quasi-static loads[J].Proceedings of the Institution of Mechanical Engineers,Part D:Journal of Automobile Engineering,2012,226(5):634-647.
[14]CHOI H G,THITE A N,THOMPSON D J.A threshold for the use of Tikhonov regularization in inverse force determination[J].Applied Acoustics,2006,67:700-719.
[15]CHOI H G,THITE A N,THOMPSON D J.Comparison of methods for parameter selection in Tikhonov regularization with application to inverse force determination[J].Journal of Sound and Vibration,2007,304(3/4/5):894-917.