Liu Z.,Wuhan University of Technology |
Liu Z.,Hubei Key Laboratory of Advanced Technology of Automobile Parts |
Hu Y.,Wuhan University of Technology |
Hu Y.,Hubei Key Laboratory of Advanced Technology of Automobile Parts |
And 3 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2015
This paper aims at investigating the effects of the thermal load of engine on the vibration modes of exhaust manifold. Firstly after the theory of modal analysis is expounded, a finite element model for exhaust manifold is built and modal analyses in both normal and raised temperature conditions are conducted in free state and constraint state of bolt pre-tightening force respectively. Then modal test system is constructed and modal tests in both normal and raised temperature conditions are also performed in free state and bolt pre-tightening constraint state respectively. Finally the comparison between the results of finite element modal analysis and modal tests indicate that the results of finite element modal analysis are well agree with that of modal tests; both the thermal load of engine and the constraint of bolt pre-tightening force have obvious effects on the vibration modes of exhaust manifold: the natural frequencies of exhaust manifold significantly rise with the constraint of bolt pre-tightening applied, but they slightly fall with the increase in temperature. ©, 2015, SAE-China. All right reserved.
Yan F.-W.,Wuhan University of Technology |
Liu Y.-L.,Wuhan University of Technology |
Liu Z.-E.,Hubei Key Laboratory of Advanced Technology of Automobile Parts |
Fu D.-Y.,Hubei Key Laboratory of Advanced Technology of Automobile Parts
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014
The main aim of the study is to get the temperature and backpressure of a car engine exhaust gas which goes through the EGR-cooler. So the internal fluid flow and heat transfer process of the EGR cooler must be studied more clearly, numerical simulations are applied. Based on the strong coupling method, gas-solid-liquid three phases coupling model of the typical heat transfer unit is established. According to the coupling result, the heat flux of the tube's outside surface is gained and then mapped to the inner surface of the cooler's water. The water model is set up based on the separation coupling method. According to the analysis of the calculation, the detailed pressure and temperature distribution of the gas, water and solid are obtained. From the distribution cloud, we know the changes of the parameters along the fluid flows streamline. © Maxwell Scientific Organization, 2014.
Wang Y.M.,Wuhan University of Technology |
Wang Y.M.,Hubei Key Laboratory of Advanced Technology of Automobile Parts |
Wang Y.M.,Zhengzhou Nissan Automobile co. |
Du C.Q.,Wuhan University of Technology |
And 5 more authors.
Applied Mechanics and Materials | Year: 2013
Improving the driving range and driving performance are critical for pure electric vehicles(EV). Transmission ratios directly affects drivability and economy of EV. This paper analyzed the impact of various transmission ratios on the performance of EV, verified the vehicle performance with different transmission ratios by simulation with models built with GT-drive software, and based on EV performance requests, optimized the EV transmission ratios, presents single reduction gear and multi-speed transmission ratio scheme respectively, compared the EV performance with these two transmission schemes respectively, simulation results show that multi-speed transmission system can improve the performance of electric vehicle on dynamic and economy. © (2013) Trans Tech Publications, Switzerland.
Ma L.,Hubei Key Laboratory of Advanced Technology of Automobile Parts |
Xia W.F.,South China University of Technology
Applied Mechanics and Materials | Year: 2014
The FEM model of the body and acoustic cavity are created, and the acoustic-structure coupled system is built up,and the SPL(sound press level) of points corresponding to the driver's ear and passengers' ears were calculated using software LMS.virtual.lab. And there are several relatively noticeable acoustic pressure peaks around 60Hz, 102Hz, 120Hz and 168Hz. The maximum noise value was calculated by using the method of ATV method, several suggestions are advised to decrease the vehicle interior noise so that the vehicle ride comfort could be improved. © (2014) Trans Tech Publications, Switzerland.