A method for estimating mount isolations of powertrain mounting systems

Abstract A method for calculating isolation ratios of mounts at a powertrain mounting systems (PMS) is proposed assuming a powertrain as a rigid body and using the identified powertrain excitation forces and the measured IPI (input point inertance) of mounting points at the body side. With measured accelerations of mounts at powertrain and body sides of one Vehicle (Vehicle A), the excitation forces of a powertrain are identified using conversational method firstly. Another Vehicle (Vehicle B) has the same powertrain as that of Vehicle A, but with different body and mount configuration. The accelerations of mounts at powertrain side of a PMS on Vehicle B are calculated using the powertrain excitation forces identified from Vehicle A. The identified forces of the powertrain are validated by comparing the calculated and the measured accelerations of mounts at the powertrain side of the powertrain on Vehicle B. A method for calculating acceleration of mounting point at body side for Vehicle B is presented using the identified powertrain excitation forces and the measured IPI at a connecting point between car body and mount. Using the calculated accelerations of mounts at powertrain side and body side at different directions, the isolation ratios of a mount are then estimated. The isolation ratios are validated using the experiment, which verified the proposed methods for estimating isolation ratios of mounts. The developed method is beneficial for optimizing mount stiffness to meet mount isolation requirements before prototype.

[1]  D. Thompson,et al.  Comparison of methods for parameter selection in Tikhonov regularization with application to inverse force determination , 2007 .

[2]  Wen-Bin Shangguan,et al.  A method for calculating the displacements of a powertrain and mounts in a powertrain mounting system including torque struts under quasi-static loads , 2012 .

[3]  Min Wang,et al.  A novel design of semi-active hydraulic mount with wide-band tunable notch frequency , 2014 .

[4]  Takeshi Okada,et al.  Force identification of an outboard engine by experimental means of linear structural modeling and equivalent force transformation , 2007 .

[5]  Mohamad S. Qatu,et al.  Overview of automotive noise and vibration , 2009 .

[6]  Wen Bin Shangguan,et al.  Engine mounts and powertrain mounting systems: a review , 2009 .

[7]  Alain Berry,et al.  Active vibration control on a quarter-car for cancellation of road noise disturbance , 2012 .

[8]  K. Y. Lam,et al.  Excitation Force Identification of AN Engine with Velocity Data at Mounting Points , 2001 .

[9]  Vikas Bhardwaj,et al.  Improved Powertrain Mounts Position for Four Cylinder Engine Commercial Vehicle with Four Point Mounting Configuration , 2016 .

[10]  Chuanyan Xu,et al.  Engine Excitation Force Identification on the Basis of Discrete Spectrum Correction , 2015 .

[11]  Subhash Rakheja,et al.  Design method of automotive powertrain mounting system based on vibration and noise limitations of vehicle level , 2016 .

[12]  J.-H. Kim,et al.  Elastic foundation effects on the dynamic response of engine mount systems , 2000 .

[13]  Weikang Jiang,et al.  Research on the Optimal Design of Engine Mounts by Minimizing Transfer Power based on Identifying Excitation and Admittance Matrix , 2015 .

[14]  Mohamad S. Qatu,et al.  Accurate modeling for the powertrain and subframe modes , 2003 .

[15]  Limei Wang,et al.  Real time identification of the internal combustion engine combustion parameters based on the vibration velocity signal , 2017 .

[16]  Zaidi Mohd Ripin,et al.  Optimization of an engine mounting system with consideration of frequency-dependent stiffness and loss factor , 2016 .

[17]  Alexandre Loredo,et al.  Vibration reduction on city buses: Determination of optimal position of engine mounts , 2010 .

[18]  M Qatu,et al.  Robustness of powertrain mount system for noise, vibration and harshness at idle , 2002 .

[19]  Yunqing Zhang,et al.  A novel approach for lower frequency performance design of hydraulic engine mounts , 2006 .

[20]  Amir Khajepour,et al.  Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis , 2003 .

[21]  Yi Liu,et al.  Dynamic force identification based on enhanced least squares and total least-squares schemes in the frequency domain , 2005 .

[22]  Hashem Ashrafiuon,et al.  Dynamic Analysis of Engine-Mount Systems , 1992 .

[23]  YuanTong Gu,et al.  A general approach to tune the vibration properties of the mounting system in the high-speed and heavy-duty engine , 2016 .

[24]  K. Y. Lam,et al.  DESIGN OPTIMIZATION OF MARINE ENGINE-MOUNT SYSTEM , 2000 .

[25]  David Thompson,et al.  A threshold for the use of Tikhonov regularization in inverse force determination , 2006 .

[26]  Weidong Zhu,et al.  A study on optimization method of a powertrain mounting system with a three-cylinder engine , 2017 .

[27]  Rajendra Singh,et al.  Improved torque roll axis decoupling axiom for a powertrain mounting system in the presence of a compliant base , 2012 .