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2014 International Conference on Remote Sensing and Smart City(RSSC2014)

作者： Z.Q.Gu J.Li Y.Zhang S.Y.Zhang School of Mechanical Engineering Hunan University of Technology State Key Laboratory of Advanced Design and Manufacture for Vehicle Body (Hunan University)

ISBN: (纸本)9781784660291

vehicle queue is an important manifestation of road congestion, is one of the basic parameters for traffic analysis. This paper presents the Slider Threshold Search Method(STSM) to identify the location and length of vehicle queue on high resolution aerial images. We use SURF feature extraction and Support Vector Machine(SVM) classification to extract vehicle information(including number, position, covers) on masked high resolution aerial images, and on the basis of vectors road information, we utilize the STSM to identify vehicle queue. The initial testing result demonstrate that the STSM can extract macroscopic and large area information on vehicle queue quickly and efficiently, and those information delivered by the STSM can provide scientific data to traffic control and road network construction for traffic manage departments.

关键词： high resolution aerial images vehicle detection vehicle queue surf feature support vector machines

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The road network evolution of Shenzhen–Dongguan–Huizhou urban agglomeration based on high-resolution remote sensing

The road network evolution of Shenzhen–Dongguan–Huizhou ur...

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2014 International Conference on Remote Sensing and Smart City(RSSC2014)

作者： Z.Q.Gu S.Y.Zhang Y.Zhang J.Li School of Mechanical Engineering Hunan University of Technology State Key Laboratory of Advanced Design and Manufacture for Vehicle Body (Hunan University)

ISBN: (纸本)9781784660291

To address traffic jams in cities or urban agglomeration due to that current transport network cannot satisfy demands, this paper initiates to analyze transport network evolution with high-resolution remote sensing images which is characterized by high macroscope and visibility. K clustering and region growing methods are used for remote sensing road network extraction, construct road network space method under the evaluation index of road network density, and make comparison, analysis and prediction of current situation and historical states of Shenzhen–Dongguan–Huizhou urban agglomeration road network based on the data of four historical years. It is indicated by analysis that the regional evolution of urban agglomeration road network has its direction and disciplinarian. The method proposed in this essay has overcome visual deficiency in the economic evaluation and analysis of traditional road network, providing some references for road network plan and construction in the future.

关键词： high-resolution remote sensing image urban agglomeration road network k clustering region growing method road network density time–space evolution

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A study on nondestructive testing technology for recycling of re-usable automotive parts

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Huanan Ligong Daxue Xuebao/Journal of South China University of technology (Natural Science) 2014年第11期42卷 55-62页

作者： Pang, Lin-Hua Wen, Gui-Lin College of Mechanical and Vehicle Engineering State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Torch High Technology Industry Development Center of Ministry of Science and Technology Beijing100045 China

Recycling of qualified or re-useable automotive parts is an inevitable trend for the development of automotive recycling market and dismantling industry, and is a practical requirement for the development of resource-saving society. The precondition of the recycling is that the testing technologies are advanced enough to ensure the quality of re-usable parts. The nondestructive testing technology has become an important means of quality control. In this paper, the nondestructive testing technology for reusing automotive parts is taken into account. Five nondes-tructive testing technologies, namely, X-ray testing, ultrasonic testing, magnetic particle testing, eddy current testing and permeability testing, are discussed and the application scopes and characteristics of several new nondes-tructive testing technologies are generalized. Furthermore, this paper points out that the trends of the nondestructive testing technology for the recycling of re-useable automotive parts are to make traditional detection methods more automatic and intelligent, to design more reasonable test evaluation system, to integrate multiple detection means and to exploit new detection technologies. The final conclusion can provide guidance for the in-depth research of the nondestructive testing technology for the recycling of re-useable automotive parts. ©, 2014, South China University of technology. All right reserved.

关键词： Recycling

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Performance evaluation on field synergy and composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter

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Journal of Central South University 2014年第12期21卷 4599-4606页

作者： Zuo, Qing-song E, Jia-qiang Gong, Jin-ke Zhang, D.M. Chen, Tao Jia, Guo-hai State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China School of Mechanical Engineering University of South China Hengyang 421001 China Department of Industrial Technology California State University Fresno 93740-8002 CA United States

In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180–1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio 0.56–0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved. © 2014, Central South University Press and Springer-Verlag Berlin Heidelberg.

关键词： combustion field synergy numerical simulation particulate filter particulate matter

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Decoupling control on full vehicle active suspension

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Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis 2014年第2期34卷 366-371页

作者： Chen, Jianguo Cheng, Junsheng Nie, Yonghong State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha 410082 China Department of Mechanical Engineering Hubei University of Automotive Technology Shiyan 442002 China

Since vehicle tires undergo excitation from the road, the sprung mass vibration couples that of the tires. In order to effectively attenuate the vibration of the vehicle, a full vehicle model with active suspension is established and decoupled using a differential geometry method. In the decoupled suspension system, the heaving, pitching, and rolling motion of the sprung mass are independent of each other and become separate linear subsystems, that can be controlled separately. An attenuation control rule is designed to attenuate the vibration of the decoupled suspension system. The simulations show that the vibration is greatly attenuated, which indicates that the control algorithm is effective.

关键词： Geometry

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Roll control of vehicle active suspension under steering condition

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Qiche Gongcheng/Automotive engineering 2014年第5期36卷 616-620页

作者： Chen, Jianguo Cheng, Junsheng Nie, Yonghong Wang, Baohua Department of Mechanical Engineering Hubei University of Automotive Technology Shiyan 442002 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 China

In view of the coupling between the vibration of sprung mass and wheels motion, in particular, the effects of wheel steering angle on vehicle roll, for reducing vehicle roll and effectively suppressing vehicle vibration, a model for the vehicle with active suspension is built and the roll and vibration control laws are designed to decouple the model by applying differential geometry theory. After decoupling, the pitch, roll and heave motions of sprung mass become independent to each other with the effect of wheel turning angle on vehicle roll effectively contained. The results of simulation show that with differential geometry decoupling, the roll angle, pitch angle and vertical vibration as well as the overshoot of yaw rate are greatly reduced with the ride comfort and steering stability of vehicle remarkably improved.

关键词： Steering

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An effective sub-domain smoothed Galerkin method for free and forced vibration analysis

An effective sub-domain smoothed Galerkin method for free an...

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中国计算力学大会2014暨第三届钱令希计算力学奖颁奖大会

作者： Yigang Wang Dean Hu Gang Yang Xu Han Y.T.Gu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology

Free and forced vibration analysis is significant in structural mechanics and engineering.A sub-domain smoothed Galerkin method is developed for free and forced vibration analyses of 2D *** method integrates the advantages of mesh-free Galerkin method and Finite Element Method(FEM).The arbitrarily shaped sub-domains are predefined in the problems domain represented by mesh-free *** each sub-domain,based on mesh-free Galerkin weak formulation,the local discrete equation can be obtained by using Moving Kriging(MK)interpolation,which is similar to the discrete equation of a high-order element in *** strain smoothing technique can be subsequently applied to the nodal integration of sub-domain by dividing the sub-domain into several smoothing ***,condensation of degrees of freedom(DOF)can also be introduced into discrete equations by transfer equations of inner nodes to equations of boundary nodes based on *** global dynamic equations of the present method are obtained based on the scheme of FEM by assembling all local discrete equations of sub-domains and are solved by using the standard implicit Newmark’s time integration *** examples proved that the sub-domain smoothed Galerkin method is a robust technique to simulation the elastic dynamic problems,which has high computational efficiency and good accuracy.

关键词： mesh-free Galerkin method FEM MK interpolation strain smoothing technique condensation of DOF

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reliability-based design with the mixture of probability and non-probability convex models

Reliability-based design with the mixture of probability and...

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中国计算力学大会2014暨第三届钱令希计算力学奖颁奖大会

作者： X.Liu Z.Y.Zhang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety Ministry of EducationChangsha University of Science and Technology

A new hybrid reliability analysis method is developed based on probability and ellipsoidal convex *** distributions are used to deal with the uncertain parameters with sufficient information,while the ellipsoidal convex model is employed to deal with the uncertain-but-bounded variables which are correlated with each ***,a complex nesting optimization problem will be involved in this hybrid reliability analysis and the traditional optimization method will lead to extremely low *** alleviate the computational burden,an efficient decoupling strategy is developed to solve the nesting optimization *** using Karush-Kuhn-Tucker necessary condition,the complex nesting optimization problem can be transformed to an equivalent single-layer optimization model with only random ***,the sequential quadratic programming(SQP)method is adopted to directly solve this equivalent *** present method is applied to the two numerical examples and the results are compared with the traditional nesting optimization me *** results indicate that the present method has a fine accuracy,and also an acceptable efficiency if not many uncertain parameters are involved.

关键词： Uncertainty Hybrid reliability approach Probability model Ellipsoidal convex model

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The Effect of Stress Wave on Dynamic Response of Square Thin-walled Tube

The Effect of Stress Wave on Dynamic Response of Square Thin...

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2014 International Conference on Applied Mechanics and Mechanical Automation(AMMA 2014)

作者： Zhu-hua TAN Bo ZHANG Peng-cheng ZHAI Department of engineering structure and mechanic School of ScienceWuhan University of Technology State key laboratory of advanced design and manufacturing for vehicle body Hunan University

The effect of stress wave propagation on dynamic response of square tube was investigated by the experimental and numerical simulation methods in the present paper. The square tubes were subjected to the axial impact by split Hopkinson pressure bar. And the deformation process of each square tube was recorded by a high speed camera. Typical dynamic plastic buckling phenomena were observed in the experiments. And the numerical calculation of the experimental load case was conducted to analyze the effect of the stress wave propagation on the initial buckling of the square tube. The results show that there is obvious stress wave propagation in the square tube before the buckling of the square tube. And the initial buckling starts from the rear end of the tube due to the propagation of the stress wave. The relation between the stress wave propagation and initial buckling of the square tube was also discussed.

关键词： Square tube Stress wave Dynamic plastic buckling Buckling mechanism

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Prediction and optimization of aerodynamic noise in an automotive air conditioning centrifugal fan

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Journal of Central South University 2013年第5期20卷 1245-1253页

作者：杨振东谷正气汪怡平颜建容杨晓涛 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body(Hunan University) School of Automobile Engineering Wuhan University of Technology

The high aerodynamic noise induced by automotive air conditioning systems has important effects on the ride comfort, and the centrifugal fan is the largest noise source in these systems. It is very important to reduce the aerodynamic noise generated by the centrifugal fan. The flow field and the sound field on the whole centrifugal fan configuration have been carried out using the computational fluid dynamics. Simulation results show that the sound pressure level near the outlet of the centrifugal fan is too high. Based on the relationship between flow characteristics and the aerodynamic noise, four parameters of the centrifugal fan, i.e., impeller blade＇s outlet angle 0, volute tongue＇s gap t, collector inclination angle fl, and rotating speed n, were selected as design variables and optimized using response surface methodology. While keeping the function of flow rate unchanged, the peak noise level is reduced by 8 dB or 10.8%. The noise level is satisfactorily reduced.

关键词： aerodynamic noise multi-forward-curved-blade centrifugal fan optimization response surface methodology

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