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On the deformation behavior of heterogeneous microstructure and its effect on the mechanical properties of die cast AZ91D magnesium alloy

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Journal of Magnesium and Alloys 2022年第7期10卷 1981-1993页

作者： Mengwu Wu Yingying Hou Lin Hua Huijuan Ma Xiaobo Li Shoumei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Both a conventional flow distributer and an improved one with a flow buffer were applied respectively during the high pressure die casting(HPDC)process,and samples of AZ91D magnesium alloy with different microstructure mainly consisting ofα-Mg grains,β-phase and porosities were *** to the grain orientation analysis,the predominant deformation behavior inα-Mg grains was dislocation slip,supplemented by deformation *** slip was more difficult to occur in the samples with the improved flow distributer on account of the fact that the size ofα-Mg grains in the microstructure was finer and more *** the in situ tensile deformation test,cracks were observed to initiate from gas-shrinkage pore and island-shrinkage,and two main crack propagation mechanisms,porosity growth and coalescence were found *** the crack was in contact with theβ-phase,it would pass through and fracture the networkβ-phase,whereas bypass the islandβ-phase by detaching it from the surroundingα-Mg *** property tests showed that the samples with relatively more homogeneous microstructure would perform higher mechanical properties,which was the combined effect of matrixα-Mg grains,β-phase,and porosities.

关键词： Magnesium alloy High pressure die casting Microstructure Deformation behavior Mechanical properties

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Vehicle Travel Destination Prediction Method Based on Multi-source Data

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Automotive Innovation 2021年第3期4卷 315-327页

作者： Jie Hu Shijie Cai Tengfei Huang Xiongzhen Qin Zhangbin Gao Liming Chen Yufeng Du Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China Hubei Research Center for New Energy and Intelligent Connected Vehicle Wuhan 430070China SAIC-GM-Wuling Automobile Co. LtdLiuzhouChina

Research on vehicle travel destinations mostly only consider vehicle trajectory data and ignore the influence of other multi-source data,such as weather,time,and points of interest(POI).This study proposes a destination prediction method based on multi-source data,and a multi-input neural network model is *** terms of the coding of vehicle trajectory data,a GeoHash to vector(Geo2vec)model is proposed to realize the characterization of the *** for the coding of temporal features,a cyclic coding model is proposed based on trigonometric *** the coding of POI,an origin-destination POI matrix(OD-POI)model is proposed based on the state transition *** results show that in terms of the average distance and root-mean-square distance deviations,Geo2vec reveals reductions of 4.51%and 5.63%compared to word to vector(Word2vec),and cyclic encoding shows reductions of 6.35%and 6.67%compared to label encoding;further,the method of OD-POI state transition probability is reduced by 5.85%and 6.4%,and the model based on multi-source data is 17.29%and 17.65%lower than the model based on trajectory data ***,the cyclic encoding is reduced by 48.60%in the data dimension compared to one-hot *** destination prediction will help improve the efficiency of automotive human-computer interaction.

关键词： Vehicle trajectory Multi-source data Destination prediction Deep learning

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A method of generating car sounds based on granular synthesis algorithm

Noise Control Engineering Journal

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Noise Control Engineering Journal 2022年第4期70卷 384-393页

作者： Xie, Liping Lu, Chihua Liu, Zhien Zhu, Yawei Song, Weizhi Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

The active sound generation technique for automobiles, where car sounds can be synthesized by means of electronic sound production, is one of the effective methods to achieve the target sound. A method for active sound generation of automobile based on the granular synthesis algorithm is put forward here to avoid the broadband beating phenomena that occur due to the mismatch of parameters of sound granular signals. The comparison of the function expression of sound signal and Hilbert transformation is performed based on the principle of overlap and add;moreover, those parameters (phase, frequency and amplitude) of sound signals are interpolated by means of the Hermite interpolation algorithm which can ensure the continuity of the phase, frequency and amplitude curves. Thus, the transition audio is constructed by means of the sound signal function here to splice the adjacent sound granules. Our simulations show that our method can be applied to solve the current broadband beating issue for splicing sound granules and achieve natural continuity of synthesized car sounds. The subjective test results also indicate that our transition audio can produce high quality audio restitution. © 2022 Institute of Noise Control Engineering.

关键词： Granulation

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A maritime emergency search and rescue system based on unmanned aerial vehicle and its landing platform

A maritime emergency search and rescue system based on unman...

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2021 IEEE International Conference on Electrical Engineering and Mechatronics technology, ICEEMT 2021

作者： Chen, Mingzhang Zeng, Fanfei Xiong, Xiaoshuang Zhang, Xuancheng Chen, Zhongbao Wuhan University of Technology Hubei Key Laboratory of Advanced Technology For Automobile Components Wuhan China Wuhan Textile University Hubei Key Laboratory of Digital Textile Equipment Wuhan China

ISBN: (纸本)9781665441285

With the continuous development of the marine economy and the inland river transport, traditional maritime cruise ship cruise supervision methods have the shortcomings of short supervision range, small supervision scope, and high cost, etc., which makes it difficult to meet the requirements of modern maritime supervision. This paper proposes a maritime emergency search and rescue system based on unmanned aerial vehicle (UAV) and its landing platform. The system takes the base station with two types of UAV, namely cruise UAV and rescue UAV, as the base point, and realizes unmanned, visualized and normalized monitoring and management of the target waters through the coupling of UAV, aerial protection base stations and control terminals, and provides more detailed and accurate information for the development of search and rescue work. © 2021 IEEE.

关键词： Antennas

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Research on traffic accident morphological analysis based on the improved grey relational method

Research on traffic accident morphological analysis based on...

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2nd International Conference on Transportation Information and Safety: Improving Multimodal Transportation Systems - Information, Safety, and Integration, ICTIS 2013

作者： Zeng, Juan Wu, Huilan Shi, Xiaorong School of Automobile Engineering Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology China School of Automobile Engineering Wuhan University of Technology China

ISBN: (纸本)9780784413036

Traffic accident morphological analysis is the prerequisite and condition of accident warning. Grey Relational Analysis is one of the important methods of morphological analysis of the accident, which can effectively solve the problem of inadequate sample size defects but cannot solve discrete data caused by the results of the analysis of the distortion problem. This paper adopts the least square method to improve the analysis of the correlation degree. The results show that the new method can effectively improve the accuracy and precision of the analysis, which provides a new means for the accident morphological analysis. © 2013 American Society of Civil Engineers.

关键词： Linguistics

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Hybrid CFD/FEM-BEM simulation of cabin aerodynamic noise for vehicles traveling at high speed

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Science China(Technological Sciences) 2013年第7期56卷 1697-1708页

作者： WANG YiPing ZHEN Xin WU Jing GU ZhengQi XIAO ZhenYi YANG Xue Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology State Key Laboratory of Automotive Simulation and Control Jilin University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Wuhan Ordnance Noncommissioned officers School

Flow passing a vehicle may lead to the increase of the cabin interior noise level through a variety of mechanisms. These mechanisms include vibrations caused by aerodynamic excitations and reradiation from the glass panels, exterior noise trans-mitted and leaked through door seals including gaps and glass edge, and transmission of airborne noise generated by the interaction of flow with body panels. It is of vital importance to predict both the flow fields and the acoustic sources around the ve-hicle to accurately assess the impact of wind induced noise inside the cabin. In the present study, an unstructured segregated finite volume model was used to calculate the flow fields in which a hexahedron grid is used to simplify the vehicle geometry.A large eddy simulation coupled with a wall function model was applied to predict the exterior transient flow fields. The mean flow quantities were thus calculated along the symmetry plane and the vehicle's side windows. A coupled FEM/BEM method was used to compute the vehicle's interior noise level. The total contribution of the interior noise level due to the body panels of the vehicle was subsequently analyzed.

关键词： aerodynamic noise computational fluid dynamics large eddy simulation finite element method boundary element method

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Numerical analysis of loaded stress and central displacement of deep groove ball bearing

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Journal of Central South University 2016年第10期23卷 2542-2549页

作者：杨磊邓松李红星 Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan 430070 China Zhejiang Tianma Bearing Co. Ltd. Hangzhou 310015 China

The aim of this work is to develop a three-dimensional model of deep groove ball bearing to investigate the loaded stresses and central displacements of bearing rings. The equivalent stresses and central displacements of bearing rings are obtained based on the simulated analysis. Moreover, several parameters, such as load magnitude, raceway groove curvature radius(RGCR), thicknesses of outer and inner rings, are varied to investigate their effects on the equivalent stresses and central displacements of bearing rings. Research results provide useful guidelines for determining the design parameters.

关键词： deep groove ball bearing equivalent stress central displacement

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Joining Performance and Microstructure of the 2024/7075 Aluminium Alloys Welded Joints by Vaporizing Foil Actuator Welding

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Journal of Wuhan University of technology(Materials Science) 2019年第2期34卷 368-372页

作者：孟正华 WANG Xu GUO Wei HU Zhili Anupam Vivek HUA Lin Glenn S DAEHN Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Department of Materials Science and Engineering The Ohio State University

Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting.

关键词： impact welding dissimilar materials vaporizing foil actuator joining interface

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Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants

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Friction 2020年第5期8卷 905-916页

作者： Mohamed Kamal Ahmed ALI Xianjun HOU Mohamed AAABDELKAREEM Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were com-prehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%–30% and 26.5%–32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

关键词： engine tribology nanomaterial nanolubricant friction wear tribofilm

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A model for converting thermal analysis to volume fraction of high carbon bearing steels during low-temperature tempering

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Journal of Materials Science & technology 2023年第5期136卷 212-222页

作者： Qinglong Liu Junyu Tian Wenting Wei The State Key Laboratory of Refractories and Metallurgy The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components(Wuhan University of Technology) Wuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Quantitative prediction of phase content is of great importance to control and optimize the heat treat-ment process of *** this work,a model for predicting the phase content of tempered high carbon steels was proposed by taking a martensitic 100Cr6 bearing steel as a model *** microstructural transformations during tempering were studied using thermal analysis,transmission electron microscopy(TEM),and X-ray diffraction(XRD).Kinetics analysis of thermal evolution by employing the isoconver-sional method,and assisted by TEM and XRD characterization,were performed to quantitatively estimate the volume fractions of different phases after tempering.A series of isothermal tempering experiments were designed to verify the *** predicted results were in good agreement with the experimental results of XRD and electrolytic extraction measurements.

关键词： Bearing steel Martensite tempering Retained austenite Thermal analysis Kinetics

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