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Zhang H.J.,Wuhan University of Technology | Yang B.,Hubei Key Laboratory of Advanced Technology for Automotive Components
Applied Mechanics and Materials | Year: 2014

This study constitutes an empirical fleet with electric vehicles (EV) and conventional vehicles (CV) which used by a large number of test participants who have different travel mileage to research the fuel-saving efficiency of EVs under daily travel mode within six months. Experimental results show that there is a great difference in energy consumption when EV running under different average temperatures and seasons. During summer (high temperature) and winter (low temperature) the energy consumption is bigger and the average electric consumption of 100-kilometer is 12.3 kWh/100km. The fuel-saving efficiency of EV in Tianjin empirical test is 66.7% and which is 74.8% in ten typical cities in China. EV has better fuel-saving effect in the whole country. The fuel-saving efficiency in working-days and rest-days is 80.3% and 42.2% respectively. EV has the best fuel-saving effect in working-days. © (2014) Trans Tech Publications, Switzerland. Source


Li X.Y.,Wuhan University of Technology | Li X.Y.,Hubei Key Laboratory of Advanced Technology for Automotive Components
Applied Mechanics and Materials | Year: 2014

The unbalanced masses of wheel have an important effect on the performance of the car. There we use the ADAMS software to establish the kinetic model of a wheel about the 1/4 suspension, and do the vibration analysis of unbalanced masses to a single wheel by the modular of ADAMS/Vibration. © (2014) Trans Tech Publications, Switzerland. Source


Xie J.L.,Hubei Key Laboratory of Advanced Technology for Automotive Components
Applied Mechanics and Materials | Year: 2014

The Thermoelectric Generator (TEG) recovering waste heat from the exhaust has became a potential technical issue, due to its characters of pollution-free, no moving parts, reliability and high efficiency. There exist arrangement on the chassis and the exhaust backpressure of whole system will increase of these two problems, when integrating TEG in the car of TEG and the muffler is to integrate the thermoelectric module on the surface muffler, it can effectively reduce the size of TEG, also reduce its weight and structural complexity. It also reduced the backpressure of TEG, meanwhile solved the compatibility issues with other components of exhaust system. The structural integration laid the foundation to achieve the large-scale use of thermoelectric materials in the car. © (2014) Trans Tech Publications, Switzerland. Source


Guo J.,Wuhan University of Technology | Guo J.,Hubei Key Laboratory of Advanced Technology for Automotive Components | Qian D.,Wuhan University of Technology | Qian D.,Hubei Key Laboratory of Advanced Technology for Automotive Components | And 3 more authors.
Journal of Materials Processing Technology | Year: 2016

Using hot radial ring rolling to process as-cast blank is a new ring manufacturing technology of high efficiency, high material utilization and low energy consumption. It was customarily considered that larger deformation amount is needed in the new process to obtain smaller average grain size. However, in our work, no further refinement of the average grain size has been found at a certain sufficient deformation amount. Hot radial ring rolling of as-cast GCr15 steel at elevated forging temperature has a grain limit, further deformation produced by this technology does not help overcome this limit. The key explanation to this phenomenon lies in the balance of dynamic recrystallization-induced grain reduction and thermal-induced grain growth occurred during this process. The minimum strain to reach grain limit has been defined and quantified based on the empirical dynamic recrystallization models. The effects of strain and Z parameter on grain limit have been carried out. The optimizing selections of rolling parameters based on grain limit have been discussed. These results obtained provide guidance for grain size controlling and performance improving in the new technology of manufacturing rings. © 2015 Elsevier B.V. All rights reserved. Source


Qian D.,Wuhan University of Technology | Qian D.,Hubei Key Laboratory of Advanced Technology for Automotive Components | Qian D.,Huazhong University of Science and Technology | Peng Y.,Wuhan University of Technology | Peng Y.,Hubei Key Laboratory of Advanced Technology for Automotive Components
Journal of Materials Engineering and Performance | Year: 2015

The deformation process and inter-pass time of hot working are always accompanied by complicated microstructural evolution. As a kind of low alloy steels with good malleability, Q345E steel is widely used. The specimens of Q345E steel were heated to 1123, 1223, 1323, 1423, and 1523 K and held for 0, 120, 240, 360, and 480 s, respectively, on Gleeble-3500 thermo-mechanical simulator to develop the austenite grain growth equation of Q345E steel. In addition, the ‘single-pass hot compression tests,’ ‘double-pass hot compression tests,’ and ‘single-pass hot compression and thermal insulation tests’ at temperature from 1123 to 1423 K with the strain rate from 0.01 to 10 s−1 were carried out on Gleeble-3500 thermo-mechanical simulator to investigate the behavior of dynamic recrystallization (DRX), meta-dynamic recrystallization (MDRX), and static recrystallization (SRX), and to establish the mathematical equations of DRX, MDRX, and SRX, which can predict the volume fraction of recrystallization and grain size after recrystallization. The result of error analysis and a 2D finite element simulation model during hot upsetting verifies that the experimental data agree well with the predicted values calculated by these mathematical equations, which indicates that the established mathematical equations can be applied to accurately predict the microstructural evolution of Q345E steel during hot deformation. © 2015, ASM International. Source

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