Gao Y.-K.,Tongji University |
Feng H.-X.,Tongji University |
Ma F.-W.,Zhejiang Geely Automobile Institute Co. |
Yang L.,Changan Auto Global R and nter |
Yang L.,State Key Laboratory of Vehicle NVH and Safety Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013
Modal frequencies and modal shapes of a BIW (body-in-white) reflect the inherent characteristics of an automotive body. They have an important influence on the interior noise. The car cavity also has modal frequencies and modal shapes. Acoustic modal test of a car cavity for a domestic SUV was performed with LMS data acquisition system. Firstly, the response points' signals were gained with a microphone array, and then the acoustic modal frequencies and modal shapes were extracted with PolyMAX method. The comparison between the acoustic modal frequencies and the test modal frequencies of the BIW showed that the first and the second acoustic modes of the car cavity are strongly coupled with the fourth and the tenth structural modes of the BIW. Finally, acoustic-structure coulpled resonance was verified through tests during the vehicle running. It was indicated that there are several ways to change the local modes of the automotive structure, such as, increasing the thickness of the key components, adding damping layer in the roof and floor, and strengthening the roof with ribs and so on; these actions can destroy the strong coupling between the modes of the BIW and the acoustic modes of the car cavity, decrease the lower frequency boom in the automotive. Source
Wei D.,Hefei University of Technology |
Li L.,Hefei University of Technology |
Wang P.,Hefei University of Technology |
Jiang Y.,Hefei University of Technology |
Pan P.,Zhejiang Geely Automobile Institute Co.
Qiche Gongcheng/Automotive Engineering | Year: 2016
Four-wheel-steering (4WS) system can improve the driving stability of vehicle in high speed cornering and ensure the easy handling of steering in low speed. For revealing the influence of suspension parameters on the Hopf bifurcation characteristics of 4WS vehicle in cornering driving, a driver-vehicle-road closed-loop dynamics model and a set of kinematic differential equations for a 4WS vehicle are established with consideration of the effects of suspension, and the effects of the location of vehicle mass center and the parameters of suspension on Hopf bifurcation characteristics are analyzed. The results show that as the mass center move rearward, the lateral speed and yaw rate of vehicle and the amplitudes of the self-excited roll vibration of vehicle body tend to increase. As the height of suspension roll center reduces, the amplitudes of self-excited roll vibration increase while the vibration amplitudes of lateral speed and yaw rate decrease. The increase of suspension stiffness can restrain self-excited roll vibration. © 2016, SAE-China. All right reserved. Source
Lin Y.,South China University of Technology |
Zang M.,South China University of Technology |
Hu Z.,Zhejiang Geely Automobile Institute Co. |
Chen Y.,Zhejiang Geely Automobile Institute Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013
A correlational research of an oil orbit of dual clutch automatic transmission model was done by using the ANSYS-Fluent software. Firstly, CFD simulation of the oil orbit was done and the mass flow rate of each nozzle was treated as the evaluation indicator, whose results were consistent with the experimental results. Secondly, on the basis of that, the influences of oil temperature variation on the distribution of the mass flow rates of these nozzles were studied. At last, the injected situation of the oil orbit and the influence of splashing fluid were simulated in the overall CFD model of transmission when they were at the case of complex oil and air two-phase flow. And the rationality for the design of lubrication system of oil orbit was verified. Source
Liu W.,China Institute of Technology |
Yu T.,Yantai University |
Fang H.,Zhejiang Geely Automobile Institute Co. |
Jiang Z.,Zhejiang Geely Automobile Institute Co. |
And 2 more authors.
Advanced Materials Research | Year: 2012
With CAE simulation technology and vehicle test, the frequency response characteristics of airbag electronic control unit bracket are analyzed and the structures of airbag electronic control unit bracket are modified. Finally, the resonance requirements for installation position of airbag electronic control unit are met. © (2012) Trans Tech Publications. Source
Chen Y.,South China University of Technology |
Zang M.,South China University of Technology |
Chen Y.,Zhejiang Geely Automobile Institute Co. |
Hu Z.,Zhejiang Geely Automobile Institute Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2012
After establishing an integrated dynamics model of synchronizer, the dynamics models of shifting process for manual transmission were built by using Pro/E and ADAMS. The relationship between the shift force and the shift travel was established by simulating each shifting process in ADAMS. The problem whether the shift feeling was diminished by hand shifting can be found by analyzing the shift forces. The results provide reference for manual transmission design. The experimental results agree well with the model, which shows that this dynamics simulation study of manual transmission is valid. Source