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Yao G.-F.,Jilin University | Han C.-Y.,Jilin University | Zhang X.-L.,Jilin University | Zhao J.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2013

To reduce the radiated noise of diesel engines, firstly, the contribution of vibro-acoustic radiation is analyzed, and by analyzing the exciting force on the oil pan, the main features of the exciting force in the low frequency are obtained. Then, a constrained optimization model based on the analysis of exciting force is established, and the oil pan structure is optimized to maximize its first natural frequency. Finally, by using the ATV method implemented in Virtual.lab software, the radiation noises from the vibrating surface of the diesel engine before and after the oil pan optimization are computed respectively so as to explore the correlation between noise reduction and structural vibration. The result shows that the structural acoustic radiation power of the diesel engine reduces 2.3 dB through the structural optimization. Source


Han C.-Y.,Jilin University | Yao G.-F.,Jilin University | Zhao J.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control | Zhang X.-L.,Jilin University | Sheng X.,Jilin University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The mechanical system vibration signals effectively reflect the characteristics of the system and its blind deconvolution can provide the possibility of separation of source signals from mixed signals. A convolution model of the mechanical system vibration was proposed and the method of Multi-Channel Blind Least Mean Squares was combined with the method of Deflation Source so as to form the MBLMS-TDS algorithm. For verifing the reasonableness of the algorithm, it was applied in the blind deconvolution of some simulated mixed sources. As a practical example, the piston-slap signal and combustion signal of a diesel engine were extracted from the mixed vibration signal on the surface of the diesel engine piston by using the MBLMS-TDS algorithm. Source


Cao Z.-L.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control | Cao Z.-L.,China First Automobile Works Group Corporation | Cao Z.-L.,Jilin University | Li J.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control | And 4 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

A fluid-solid interaction simulation of hydraulic engine mounts (HEM) was developed numerically. The ALE (Arbitrary Lagrangian-Eulerian) finite element method was employed for viscous fluid flow, and linear elastic and hyper-elastic structure materials were used for modeling the steel and rubber respectively. The full interaction between fluid and structure was considered as a strong coupling action. A Laplace equation-based mesh control method was used for moving the internal meshes of the fluid domain. The dynamic characteristics of the HEM were clarified by 3D simulations, and the comparisons between numerical results aud experimental results demonstrate the reliability of the proposed method. Source


Cao Z.,China First Automobile Works Group Corporation | Cao Z.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control | Cao Z.,Jinlin University | Li J.,China First Automobile Works Group Corporation | And 4 more authors.
Lecture Notes in Electrical Engineering | Year: 2013

This paper sets the hydraulic engine mount (HEM) of a car as its research object and established the strong fluid-solid interaction finite element model for its property analysis by adopting the INTESIM strong fluid-solid finite element method. A stimulation analysis of the model's static and translation dynamic stiffness characteristics was conducted,compared with the experimental result and the effectiveness of the simulation research findings was verified. The research demonstrates that the translation dynamic characteristics of the HEM can be effectively simulated by the INTESIM strong fluid-solid finite element method; on the basis of which, a preliminary discussion on its torsion dynamic stiffness characteristics was carried out also. © Springer-Verlag 2013. Source


Cao Z.,China First Automobile Works Group Corporation | Cao Z.,State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise and Safety Control | Cao Z.,Jilin University | Li J.,China First Automobile Works Group Corporation | And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

The durability of automotive products is an important factor to affect their competitiveness; meanwhile, due to their long development cycle and huge costs, the durability control in their conceptual design stage is in great need. Virtual proving ground to predict the durability has been used to performance of a passenger car suspension. A simulation model of flexible virtual proving ground (VPG) for a passenger car has been created, with a variety of durability enhancement roads in the Nong'an Proving Ground as inputs. A string of key technological problems (tire model, stiffness of bushing and roads model) regarding VPG applications has been solved. In addition, the time-history dynamic stress response of a car suspension system has been analyzed, and compared it with the real passenger car durability test results obtained under the same conditions. The results of the simulation and the test are basically identical in terms of the trend of time and frequency domains. Furthermore, the effectiveness of the flexible VPG technology for the simulated suspension system's dynamic stress response has been demonstrated, and the effective prediction for the suspension system durability in the development process has been realized. © 2012 Journal of Mechanical Engineering. Source

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