基于组合频响函数的动力总成刚体模态参数识别
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摘要
动力总成刚体模态是悬置系统设计的重要参数,为得到完整6阶刚体模态参数,阐述了基于组合频响函数的动力总成刚体模态试验与参数识别流程,并组合不同单激励点模态试验的频响函数结果进行参数识别。经模态置信矩阵检测,组合频响函数识别结果的模态振型正交性良好,不同组间模态频率稳定且模态振型一致。在准确测量动力总成刚体动力学参数和悬置三向动刚度的基础上,建立了含抗扭杆的动力总成-悬置系统12自由度刚体模态仿真模型。试验与仿真结果表明,两者模态频率吻合良好且主振动方向完全一致,即通过不同激励点的组合频响函数识别6阶刚体模态的方法与流程可行且准确。
The rigid modal parameters are essential to the design of powertrain mounting system. In order to obtain the complete 6-order rigid modal parameters, the powertrain rigid modal experiment and parameter identification process are elaborated based on combined frequency response function. And the parameters are identified by combining the frequency function results of modal experiment at different single excitation points. Modal assurance criterion shows the modal shapes from the combined frequency response function identification results are orthogonal, the modal frequencies from different combinations are stable and the modal shapes are consistent. Based on the accurate measurement of powertrain rigid body dynamic parameters and dynamic stiffness of mounts in three directions, the 12-DOFs rigid modal model for powertrain mounting system with torque-struct is established and simulated. Experiment and simulation modal frequencies are in good agreement and the main vibration direction is identical, so it can be concluded that the 6-order rigid modal parameter identification by the combined frequency response function of different excitation points is feasible,and the results are accurate.
The rigid modal parameters are essential to the design of powertrain mounting system. In order to obtain the complete 6-order rigid modal parameters, the powertrain rigid modal experiment and parameter identification process are elaborated based on combined frequency response function. And the parameters are identified by combining the frequency function results of modal experiment at different single excitation points. Modal assurance criterion shows the modal shapes from the combined frequency response function identification results are orthogonal, the modal frequencies from different combinations are stable and the modal shapes are consistent. Based on the accurate measurement of powertrain rigid body dynamic parameters and dynamic stiffness of mounts in three directions, the 12-DOFs rigid modal model for powertrain mounting system with torque-struct is established and simulated. Experiment and simulation modal frequencies are in good agreement and the main vibration direction is identical, so it can be concluded that the 6-order rigid modal parameter identification by the combined frequency response function of different excitation points is feasible,and the results are accurate.
引文
[1]何水龙,许恩永,韦永尤,等.基于动力悬置优化的商用车转向盘怠速抖动控制研究[J].汽车技术,2018(5):36-40.
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[11]刘晓昂,上官文斌,秦际宏,等.不同模型计算动力总成刚体模态方法[J].振动、测试与诊断,2016,36(2):269-275+400.
[12]沃德·海伦,斯蒂芬·拉门兹,波尔·萨斯.模态分析理论与试验[M].北京:北京理工大学出版社,2001.
[13]范让林,张璐璐,张虓.三线扭摆振动周期测量方法及其实现[J].机械设计与制造,2015(8):259-261+266.
[14]胡培龙.含防扭拉杆的动力总成悬置系统固有特性的研究[D].广州:华南理工大学,2011.
[2]郑利锋,王铁,张瑞亮.牵引车动力总成悬置系统优化分析[J].汽车技术,2018(2):45-48.
[3]庞剑.汽车车身噪声与振动控制[M].北京:机械工业出版社,2015.
[4]Delprete C,Galeazzi A,Pregno F.Experimental Modal Analysis of an Automotive Powertrain[C]//Applied Mechanics and Materials.Trans Tech Publications,2010,24:71-76.
[5]胡金昌,贺才春,查国涛.考虑车架作用的动力总成刚体模态识别[J].噪声与振动控制,2015,35(1):63-67.
[6]Friedmann A,Schmidt M.Engine Excitation for Operational Modal Analysis[J].Proceedings IOMAC,2009,3.
[7]Jin Y,Zhang J,Guan X.Theoretical Calculation and Experimental Analysis of the Rigid Body Modes of Powertrain Mounting System[J].WSEAS Transactions on Applied and Theoretical Mechanics,2013,8(3):193-201.
[8]樊逸斌,张平,段小成,等.基于运行模态法的动力总成刚体模态试验研究[J].噪声与振动控制,2010,30(6):70-74.
[9]吕兆平,杨晓,秦际宏.某微型车驾驶室座椅导轨怠速异常振动分析与改进[J].汽车技术,2012(12):47-50.
[10]范让林,黄元毅,吕兆平.汽车动力总成-悬置系统的简化及其启发[J].机械设计与制造,2010,20(4):8-10.
[11]刘晓昂,上官文斌,秦际宏,等.不同模型计算动力总成刚体模态方法[J].振动、测试与诊断,2016,36(2):269-275+400.
[12]沃德·海伦,斯蒂芬·拉门兹,波尔·萨斯.模态分析理论与试验[M].北京:北京理工大学出版社,2001.
[13]范让林,张璐璐,张虓.三线扭摆振动周期测量方法及其实现[J].机械设计与制造,2015(8):259-261+266.
[14]胡培龙.含防扭拉杆的动力总成悬置系统固有特性的研究[D].广州:华南理工大学,2011.