动力总成悬置系统模态解耦与复杂基础弹性振动特性研究
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摘要
针对动力总成等振源机器多维振动耦合问题,建立动力总成悬置系统运动力学模型,求解动力总成六自由度固有频率及主要振动模态解耦条件,并应用于工程某重型货车动力总成悬置系统设计。针对工程中复杂基础弹性振动问题,通过有限元仿真获得复杂基础模态信息,代入振动能量传递方程,进而得到复杂弹性基础隔振系统振动能量传递特性。数值模拟结果表明:振动能量曲线在复杂基础共振频率附近出现显著且密集的共振峰,隔振效果在中高频段恶化,基础弹性特性在总体系统振动传输中起关键作用;基础刚性提高对系统隔振有利。所用方法对研究工程复杂弹性基础隔振系统振动问题具有重要实际意义。
A dynamic model of a powertrain mounting system was derived to explore multi-dimensional coupling vibration of the powertrain. Then six degree-of-freedom natural frequencies were calculated and decoupling conditions of the most important vibration modal were confirmed. A powertrain mounting system of heavy truck was designed and verified. FEM and the power flow theory were combined to explore flexible vibration of complex foundations in engineering. Modal information of complex foundations can be obtained from FEM and taken into vibration power functions. Then vibration power transmitted in the vibration isolation system with complex flexible foundations can be obtained. The results show that obvious and dense peaks of vibration power appear because of foundation flexibility, isolation effect has deteriorated at middle and high frequencies. Foundation flexibility is essential to vibration transmission in the whole system. The increase of foundation rigidity is beneficial to vibration isolation. The new method is practically significant to explore flexible vibration isolation systems with complex foundations in engineering.
A dynamic model of a powertrain mounting system was derived to explore multi-dimensional coupling vibration of the powertrain. Then six degree-of-freedom natural frequencies were calculated and decoupling conditions of the most important vibration modal were confirmed. A powertrain mounting system of heavy truck was designed and verified. FEM and the power flow theory were combined to explore flexible vibration of complex foundations in engineering. Modal information of complex foundations can be obtained from FEM and taken into vibration power functions. Then vibration power transmitted in the vibration isolation system with complex flexible foundations can be obtained. The results show that obvious and dense peaks of vibration power appear because of foundation flexibility, isolation effect has deteriorated at middle and high frequencies. Foundation flexibility is essential to vibration transmission in the whole system. The increase of foundation rigidity is beneficial to vibration isolation. The new method is practically significant to explore flexible vibration isolation systems with complex foundations in engineering.
引文
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[14] SUN Lingling,SUN Wei,SONG Kongjie,et al.Effectiveness of a passive-active vibration isolation system with actuator constraints[J].Chinese Journal of Mechanical Engineering,2014,27(3):567-574.
[15] SUN L L,HANSEN C H,DOOLAN C.Evaluation of the perfor-mance of a passive-active vibration isolation system[J].Mechanical Systems and Signal Processing,2015,50/51:480-497.
[16] 王晓乐,孙玲玲,杨明月,等.圆柱壳内隔振系统的波动模型及其振动特性[J].振动工程学报,2015,28(2):227-236.WANG Xiaole,SUN Lingling,YANG Mingyue,et al.Vibrational characteristics of a power machinery mounted in a circular cylindrical shell through inclined isolators[J].Journal of Vibration Engineering,2015,28(2):227-236.
[17] KIM J H,JHO S G,YIM H J.Influence of chassis flexibility on dynamic behavior of engine mount systems[R].SAE paper,942269.
[2] 严济宽.机械振动隔离技术[M].上海:上海科学技术出版社,1985.
[3] HADI R,SACHDEVA D.Effect of mounting strategy on vehicle NVH[R].SAE Paper,2003-01-1467.
[4] 吕振华,范让林.动力总成-悬置系统振动解耦设计方法[J].机械工程学报,2005,41(4):49-54.Lü Zhenhua,FAN Ranglin.Design method for vibration uncoupling of powerplant-mounting system[J].Chinese Journal of Mechanical Engineering,2005,41(4):49-54.
[5] WU J,SHANGGUAN W B.Robust optimization design method for powertrain mounting systems based on six sigma quality control criteria[J].International Journal of Automotive Technology,2010,11(5):651-658.
[6] COURTEILLE E,LEOTOING L,MORTIER F,et al.New analytical method to evaluate the powerplant and chassis coupling in the improvement vehicle NVH[J].European Journal of Mechanics A/solids,2005,24:929-943.
[7] 周冠南,蒋伟康,吴海军.基于总传递力最小的发动机悬置系统优化设计[J].振动与冲击,2008,27(8):56-58.ZHOU Guannan,JIANG Weikang,WU Haijun.Optimal design of engine mounting system based on minimum total transefered force[J].Journal of Vibration and Shock,2008,27(8):56-58.
[8] JEONG T,SINGH R.Analytical methods of decoupling the automotive engine torque roll axis[J].Journal of Sound and Vibration,2000,234(1):85-114.
[9] PINNINGTON R J,WHITE R G.Power flow through machine isolators to resonant and non-resonant beams[J].Journal of Sound and Vibration,1981,75(2):179-197.
[10] PINNINGTON R J.Vibrational power transmission from a finite source beam to an infinite receiver beam via a continuous complaint mount[J].Journal of Sound and Vibration,1990,137(1):117-129.
[11] XIE Shilin,WING S,CHAN H L W,et al.Analysis of vibration powerflow from a vibrating machinery to a floating elastic panel[J].Mechanical Systems and Signal Processing,2007,21(1):389-404.
[12] 孙玲玲,宋孔杰.复杂机械系统多维耦合振动传递矩阵分析[J].机械工程学报,2005,41(4):38-43.SUN Lingling,SONG Kongjie.Transmission matrix method for multi-dimensional vibration analysis of complex mechanical systems[J].Chinese Journal of Mechanical Engineering,2005,41(4):38-43.
[13] SUN L,LEUNG A Y T,LEE Y Y,et al.Vibrational power-flow analysis of a MIMO system using the transmission matrix approach[J].Mechanical Systems and Signal Processing,2007,21:365-388.
[14] SUN Lingling,SUN Wei,SONG Kongjie,et al.Effectiveness of a passive-active vibration isolation system with actuator constraints[J].Chinese Journal of Mechanical Engineering,2014,27(3):567-574.
[15] SUN L L,HANSEN C H,DOOLAN C.Evaluation of the perfor-mance of a passive-active vibration isolation system[J].Mechanical Systems and Signal Processing,2015,50/51:480-497.
[16] 王晓乐,孙玲玲,杨明月,等.圆柱壳内隔振系统的波动模型及其振动特性[J].振动工程学报,2015,28(2):227-236.WANG Xiaole,SUN Lingling,YANG Mingyue,et al.Vibrational characteristics of a power machinery mounted in a circular cylindrical shell through inclined isolators[J].Journal of Vibration Engineering,2015,28(2):227-236.
[17] KIM J H,JHO S G,YIM H J.Influence of chassis flexibility on dynamic behavior of engine mount systems[R].SAE paper,942269.