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SAE 32nd Annual Brake Colloquium and Exhibition, BRAKE 2014

作者： Zhou, Liang Su, Chuqi Hubei Key Laboratory of Advanced Technology for Automotive Components Automobile Engineering Institute Wuhan University of Technology 205 Luoshi Road Hongshan District Wuhan430070 China

Recovering the braking energy and reusing it can significantly improve the fuel economy of hybrid electric vehicles (HEVs).The battery ability of recovering electricity limits the improvement of the regenerative braking performance. As one way to solve this problem, the technology of brake-by-wire can be adopted in the HEVs to use the recovery dynamically. The use of high-power electrical equipment, such as electromechanical brake (EMB), is working in the form of brake-by-wire. Due to the nature of EMB, there exists an obvious coupling relationship between the energy flow and brake force distribution. In this paper, a brake force distribution controller is proposed in HEV with EMB, which can maximize braking energy recovery, compared with the conventional distribution control without EMB. Meanwhile, an energy flow strategy working with the distribution controller is designed, which is less limited to the performance of the battery. In this strategy, the recovery transfers to the motor of EMB directly, rather than being stored statically in the battery, so it improves the efficiency of the braking energy recovery. The performance of the strategy was studied using a front-wheel drive HEV with EMB based on 42V car power net system model. The simulation results show significant higher energy recovery rate in comparison to the conventional recycling strategy. Copyright © 2014 SAE International.

关键词： Hybrid vehicles

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Analysis on hanger location and hanger isolator of an exhaust system with powertrain

Analysis on hanger location and hanger isolator of an exhaus...

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2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering, MEIC 2014

作者： Liu, Zhien Zhang, Yan Du, Songze Xiao, Shenghao Wuhan University of Technology Wuhan China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan China

ISBN: (纸本)9789462520424

To improving the NVH (Noise, Vibration and Harshness) performance of vehicles, the NVH performance of exhaust system must be considered. As hanger is the main vibration transfer path and hanger isolator is the crucial vibration isolation components, it is necessary to study hanger location and stiffness of vibration isolation. About the study of exhaust system is executed in four steps. Firstly, according the free modal analysis of the exhaust system, the ADDOFD (Average Driving Degree of Freedom Displacement) is acquired, and the suitable location of hanger is confirmed soon. Secondly, studied the powertrain influences to the vibration performance of exhaust system, the constrained modal frequencies must avoid the engine idle resonant frequency. Thirdly, the dynamic analysis of the exhaust system is researched based on the second step, in which way 100000N·mm sinusoidal excitation is applied at the powertrain's barycenter in the crankshaft rotation direction, and then the response reaction force (less than 5N) of the hanger are gained. Finally, the relationship between the bending and torsional modes of exhaust system and the stiffness of the hanger isolator are inquired. It is of great engineering significance. © 2014. The authors - Published by Atlantis Press.

关键词： Natural frequencies

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Numerical modelling and experimental approach for shot velocity evaluation during ultrasonic shot peening

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International Journal of Computational Materials Science and Surface Engineering 2015年第2期6卷 97-110页

作者： Yin, Fei Han, Qingyou Rakita, Milan Wang, Meng Hua, Lin Wang, Chuansheng Department of Mechanical Engineering Technology Purdue University 401 North Grant Street West LafayetteIN47906 United States Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Wuhan430070 China Special Equipment Supervision and Inspection Center of Ma'Anshan City Anhui Province243000 China

Ultrasonic shot peening is a process of surface treatment which enhances mechanical properties of materials by inducing compressive residual stresses in the surface layer. As one of the most important process parameters during ultrasonic shot peening, shot velocity significantly affects the extent of plastic deformation and the microstructure formed on the surface of treated material. Due to the high frequency of change in the magnitude and direction, shot velocity is complicated to calculate exactly. For that reason, it is usually simplified as a constant. In this study, the velocity of a single shot during ultrasonic shot peening is measured experimentally using a high speed camera, and computed with theoretical model. The proposed mathematical model simulates the impact behaviour of a single shot during ultrasonic shot peening by introducing the restitution coefficient. Research results indicate that the shot velocity calculated by the proposed model agrees well with the experimental results. In addition, the effect of the ultrasonic shot peening parameters on the shot velocity was investigated. Research results will provide reliable technique instructions for the parametrical design of the ultrasonic shot peening technique. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： Velocity

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Modal analysis of school bus body frame

Modal analysis of school bus body frame

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作者： Tian, Zhe Wen Wei, Yu Gang Si, Hao Jie Mei, Xiao Ming Kuang, Yong Hubei Key Laboratory of Advanced Technology of Automobile Parts School of Automobile Wuhan University of Technology Wuhan 430070 China Dong Feng Touring Car Co Ltd Xiangyang 441000 China

ISBN: (纸本)9783038351221

In the process of exploiting and trial-manufacturing the bus school, we find the small stiffness is insufficient, and there exits such phenomenon that small skin fractures and deformations. This paper Builds a three-dimensional model of the school bus by using CATIA software, and then imports the model into Workbench software, establishing a body frame finite model for free modal analysis. Analyzing the free modal of the body frame based on Workbench, we get the body frame's inherent frequency and vibration mode, and evaluate the body frame vibration characteristics, and put forward improvement proposal on the problem of body frame. © (2014) Trans Tech Publications, Switzerland.

关键词： Modal analysis

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Research on driving comfort evaluation of lower limb based on muscular forces

Research on driving comfort evaluation of lower limb based o...

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2nd International Conference on Precision Mechanical Instruments and Measurement technology, ICPMIMT 2014

作者： Li, Zhuo Zhao, Meng Yang Zhou, Liang Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components 122 Luoshi Road Hongshan District Wuhan 430070 China

ISBN: (纸本)9783038351948

Driving comfort is one of the most important indexes for automobile comfort evaluation. The joint torque calculation model of the lower limb in driving posture is established in the presented work firstly. The relationship between cab layout parameters and the joint torque can be obtained through dynamical simulation in the MATLAB by employing Kane method. A new method based on muscular forces is proposed to evaluate the automobile comfortableness. The force of each muscle can be obtained by employing static optimization algorithm of inverse dynamics. The impact of cab layout parameters, joint torque and the muscular forces on driving comfort and the relationship between them can be found through the analysis. As an reference, these parameters can be used to optimize the cab and offer an important support for its optimization. © (2014) Trans Tech Publications, Switzerland.

关键词： MATLAB

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Detailed characteristic comparison between PEN of planar SOFC prepared by APS and SPS

Detailed characteristic comparison between PEN of planar SOF...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Yang, Yun Zhen Xia, Wei Sheng Hubei Key Laboratory of Advanced Technology of Automobile parts Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351344

On the help of the atmosphere plasma spraying (APS) and suspension plasma spraying (SPS) conditions optimized previously, APS and SPS were both introduced to prepare the PEN (Positive- Electrolyte-Negative) of planar solid oxide fuel cells (SOFCs). Then the microstructure and material components of the PEN cells were analyzed. Experimental results show that the electrolyte layer fabricated by SPS represents higher densification, thinner thickness and more homogeneous component distribution than that manufactured by APS, and meets the microstructure and density requirements of SOFC. The porosities of cathode and anode layers by APS and SPS reached 25%-35%. Therefore, the SPS could be a better and suitable approach to fabricate PENs of SOFC stacks, and effectively improve the conductivity of electrodes. © (2014) Trans Tech Publications, Switzerland.

关键词： Plasma spraying

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Evaluation of various turbulence models in predicting airflow and turbulence around a generic vehicle model

Evaluation of various turbulence models in predicting airflo...

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4th International Conference on Materials Science and Information technology, MSIT 2014

作者： Wu, Cheng Wang, Yi Ping Yang, Xue Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Wuhan 430070 China Wuhan Ordnance Noncommissioned officers School Wuhan 430075 China

ISBN: (纸本)9783038351733

For vehicle external aerodynamic computation, the selection of the turbulence model is very important. In current research, ten RANS turbulence models were introduced to compute the time-averaged flow field around the Ahmed model with 25° backlight angle. In order to evaluate the feasibility of the turbulence model, the results were compared with the related published experimental data. The results showed that the two equations RANS turbulence models were more favorable to compute the vehicle external flow field, but parts of the two equations turbulence model just could predict the aerodynamic drag coefficient or lift coefficient effectively. However, the results further revealed that the realizable k-η could obtain the more accurate drag coefficient and lift coefficient simultaneously, and simulate the complex separation flow in the wake. © (2014) Trans Tech Publications, Switzerland.

关键词： Turbulence models

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Densifìcation mechanism of antimony-doped tin oxide ceramics by spark plasma sintering

Densifìcation mechanism of antimony-doped tin oxide ceramic...

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2014 Dianchi advanced Materials Forum

作者： Li, Qi Zhong Li, Qi Chang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan China

ISBN: (纸本)9783038353348

SnO2 ceramics were synthesized by SPS. Phase compositions and microstructures are examined by XRD, SEM and EDS, respectively. Sb2O3 used in our research were beneficial to lower the sintering temperature and promote the densifìcation of SnO2 ceramics. The SEM results show a homogeneous microstructure is approached consistent with the density measurement at 850-1000 °C. The XRD show all antimony ions came into the lattice of SnO2 to substitute for tin ions when the content of Sb2O3 are 0.1-2.5 mol%. The grain boundary are no SnO and Sb2O3, only SnO2. The mechanism of SPS sintering process is the local high temperature to produce the abnormal growth of the grain, and evaporation-condensation;and solid solution of Sb3+ go into the SnO2 lattice produce oxygen vacancy to promote densifìcation © (2014) Trans Tech Publications, Switzerland.

关键词： Ceramic materials

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Research and Simulation of ABS Control Method

Research and Simulation of ABS Control Method

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2014 International Conference on Energy Science and Applied technology(ESAT 2014)

作者： Wei Zhang Guanneng Xu Xuexun Guo Wen Zhang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Guangxi Automobile and Tractor Research Institute Hubei Collaborative Innovation Center for Automotive Components Technology

Based on the ABS model of a single wheel system,the traditional logic threshold,PID and fuzzy control method have been used to study the control system of commercial vehicle's *** the most important task of commercial vehicle's ABS is to prevent the two front(steering) wheels from locking,the slip ratio should be controlled strictly in the safe range.A very short time of locking may cause the failure of steering,so control method which can keep slip ratio in the secure scope accurately can help vehicle avoid the danger of *** up the model on Simulink ***,use the three control methods to control the *** comparing and analyzing the processes and results under the control methods,find an appropriate way that can provide the most secure and effective *** the perspective of processes(slip ratio changes),the simulations under the three control methods show the PID control gives the best slip ratio *** curve is almost coinciding with the ideal slip ratio *** oscillation of slip ratio given by fuzzy control is the most *** the point of view of the results(braking distance),the braking system with PID control has the shortest braking distance while with the fuzzy control has the *** is not to say fuzzy control is not advanced but the actual experiences difficult to *** with the long response time,the fuzzy control is not suitable for commercial vehicle's *** a result and with the development and decreasing cost of PID controller,it is competitive in today's ABS market.

关键词： ABS control methods

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PID and Velocity Feedback Control for ABS based on Wheel Slip

PID and Velocity Feedback Control for ABS based on Wheel Sli...

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2014 International Conference on Energy Science and Applied technology(ESAT 2014)

作者： Wei Zhang Guanneng Xu Xuexun Guo Wen Zhang Bin Wang Ming Chen Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Guangxi Automobile and Tractor Research Institute Hubei Collaborative Innovation Center for Automotive Components Technology

PID control and the velocity feedback control for ABS are studied of the wheel slip rate as controlled *** on these two kinds of control methods is *** is obtained that velocity feedback control and PID control exist much similarity in some extent,according to the hardware in the loop(HIL) simulation ***,the velocity feedback control has more obvious advantages than PID control in terms of the adaptability to different road *** can maintain stable control of system dynamically under the changed road condition,leading to the braking distance shorter.

关键词： PID control Automotive ABS

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