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Obstacle Avoidance in Multi-Agent Formation Process Based on Deep Reinforcement Learning

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Journal of Shanghai Jiaotong university(Science) 2021年第5期26卷 680-685页

作者： JI Xiukun HAI Jintao LUO Wenguang LIN Cuixia XIONG Yu OU Zengkai WEN Jiayan Guangxi Key Laboratory of Auto Parts and Vehicle Technology School of Electrical and Information EngineeringGuangxi University of Science and TechnologyLiuzhou 545006GuangxiChina Technology Center of dongfeng liuzhou automobile co. Ltd.Liuzhou 545000GuangxiChina

To solve the problems of difficult co.trol law design,poor portability,and poor stability of traditional multi-agent formation obstacle avoidance algorithms,a multi-agent formation obstacle avoidance method based on deep reinforcement learning(DRL)is *** method co.bines the perception ability of co.volutional neural networks(CNNs)with the decision-making ability of reinforcement learning in a general form and realizes direct output co.trol from the visual perception input of the environment to the action through an end-to-end learning *** multi-agent system(MAS)model of the follow-leader formation method was designed with the wheelbarrow as the co.trol *** improved deep Q netwrok(DQN)algorithm(we improved its disco.nt factor and learning efficiency and designed a reward value function that co.siders the distance relationship between the agent and the obstacle and the co.rdination factor between the multi-agents)was designed to achieve obstacle avoidance and co.lision avoidance in the process of multi-agent formation into the desired *** simulation results show that the proposed method achieves the expected goal of multi-agent formation obstacle avoidance and has stronger portability co.pared with the traditional algorithm.

关键词： wheelbarrow multi-agent deep reinforcement learning(DRL) formation obstacle avoidance

A Shifting Strategy for Electric co.mercial Vehicles co.sidering Mass and Gradient Estimation

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co.puter Modeling in Engineering & Sciences 2023年第10期137卷 489-508页

作者： Weiguang Zheng Junzhu Zhang Shanchao Wang Gaoshan Feng Xiaohong Xu Qiuxiang Ma School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China co.mercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545005China

The extended Kalman filter (EKF) algorithm and acceleration sensor measurements were used to identify vehiclemass and road gradient in the work. Four different states of fixed mass, variable mass, fixed slope and variableslope were set to simulate real-time working co.ditions, respectively. A co.prehensive electric co.mercial vehicleshifting strategy was formulated acco.ding to the identification results. The co.simulation results showed that,co.pared with the recursive least square (RLS) algorithm, the proposed algorithm co.ld identify the real-timevehicle mass and road gradient quickly and accurately. The co.prehensive shifting strategy formulated had thefollowing advantages, e.g., avoiding frequent shifting of vehicles up the hill, making full use ofmotor braking downthe hill, and improving the overall performance of vehicles.

关键词： EKF algorithm electric co.mercial vehicle vehicle mass road gradient co.prehensive shifting strategy

Multi-Scale Design and Optimization of co.posite Material Structure for Heavy-Duty Truck Protection Device

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co.puter Modeling in Engineering & Sciences 2024年第5期139卷 1961-1980页

作者： Yanhui Zhang Lianhua Ma Hailiang Su Jirong Qin Zhining Chen Kaibiao Deng School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545006China co.mercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,to present a lightweight-developed front underrun protection device(FUPD)for heavy-duty trucks,plain weave carbon fiber reinforced plastic(CFRP)is used instead of the original high-strength ***,the mechanical and structural properties of plain carbon fiber co.posite anti-co.lision beams are co.paratively analyzed from a multi-scale *** studying the design capability of carbon fiber co.posite materials,we investigate the effects of TC-33 carbon fiber diameter(D),fiber yarn width(W)and height(H),and fiber yarn density(N)on the front underrun protective beam of carbon fiber *** on the investigation,a material-structure matching strategy suitable for the front underrun protective beam of heavy-duty trucks is ***,the co.posite material structure is optimized by applying size optimization and stack sequence optimization methods to obtain the higher performance carbon fiber co.posite front underrun protection beam of co.mercial *** results show that the fiber yarn height(H)has the greatest influence on the protective beam,and theH1matching scheme for the front underrun protective beamwith a carbon fiber co.posite structure exhibits superior *** proposed method achieves a weight reduction of 55.21% while still meeting regulatory requirements,which demonstrates its remarkable weight reduction effect.

关键词： Structural optimization front underrun protection device carbon fiber reinforced plastic multi-scale model lightweight design

Lightweight Design of co.mercial Vehicle Cab Based on Fatigue Durability

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co.puter Modeling in Engineering & Sciences 2023年第7期136卷 421-445页

作者： Donghai Li Jiawei Tian Shengwen Shi Shanchao Wang Jucai Deng Shuilong He School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China dongfeng liuzhou Motor co. Ltd.Liuzhou545005China

To better improve the lightweight and fatigue durability performance of the tractor cab,a multi-objective lightweight design of the cab was carried out in this ***,the finite element model of the cab with co.nterweight loading was established and then co.firmed by the physical testing,and use the inertial reliefmethod to obtain stress distribution under unit *** cab-frame rigid-flexible co.plingmulti-body dynamicsmodelwas built by Adams/car *** the cab airbag mount displacement and acceleration signals acquired on the proving ground as the desired signals and obtaining the fatigue analysis load spectrum through Femfat-Lab virtual *** fatigue simulation analysis is performed in nco.e based on the Miner linear fatigue cumulative damage ***,with themass and fatigue damage values as the optimization objectives,the bending-torsional stiffness and first-order bending-torsional mode as co.straints,the thickness variables are screed based on the sensitivity *** experimental design was carried out using the Optimal Latin hypercube method,and the multi-objective optimal design of the cab was carried out using theKriging approximationmodel fitting and particle *** weight of the optimized cab is reduced by 7.8%on the basis of meeting the fatigue durability ***,a seven-axis road simulation test rig was designed to verify its fatigue *** results show the optimized cab can co.sider both lightweight and durability.

关键词： Finite element analysis multi-body dynamics fatigue durability analysis sensitivity analysis lightweight design particle swarm optimization

Study on Dimension Chain Generation for Auto-body Tolerance Analysis

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Journal of Shanghai Jiaotong university(Science) 2006年第4期11卷 417-422页

作者：周江奇邢彦锋来新民陈关龙兰先韦春洲 School of Mechanical Eng. Shanghai Jiaotong Univ. SGMW automobile co. Ltd. Liuzhou 545007 China SGMW automobile co. Ltd.

For auto-body product, assembly dimensional quality evaluation using tolerance analysis method is a challenging task because there are plenty of elements impacting on the variation stack-up and propagation during assembly process. Traditional method of dimension chain generation based on tolerance charting technique can not suit the case of auto-body assembly. This paper proposed a method to generate dimension chain based on developing a jot chain model of assembly, which can be integrated with important information needed for variation analysis, such as joints types and assembly sequences. The implementation of such a procedure will co.tribute to rapid evaluation of body dimensional quality in the design stage.

关键词： dimension chain auto-body tolerance analysis

Optimization of Engine co.trol Strategies for Low Fuel co.sumption in Heavy-Duty co.mercial Vehicles

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co.puter Modeling in Engineering & Sciences 2023年第12期137卷 2693-2714页

作者： Shuilong He Yang Liu Shanchao Wang Liangying Hu Fei Xiao Chao Li School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China Technology Center of co.mercial Vehicle Dongfeng Liuzhou Motor Co.Ltd.Liuzhou545005China

The reduction of fuel co.sumption in engines is always co.sidered of vital *** these lines,in this work,this goal was attained by optimizing the heavy-duty co.mercial vehicle engine co.trol *** specifically,at first,a general first principles model for heavy-duty co.mercial vehicles and a transient fuel co.sumptionmodel for heavy-duty co.mercial vehicles were developed and the parameters were adjusted to fit the empirical *** accuracy of the proposed modelwas demonstrated fromthe stage and the final ***,the co.trol optimization problem resulting in low fuel co.sumption in heavy co.mercial vehicles was described,with minimal fuel usage as the optimization goal and throttle opening as the co.trol ***,a time-co.tinuous engine management approach was ***,the factors that influence low fuel co.sumption in heavy-duty co.mercial vehicles were systematically *** reduce the co.puting co.plexity,the co.trol strategies related to the time co.straints of the engine were parametrized using three different *** most effective solution was obtained by applying a global optimization strategy because the co.strained optimization problem was ***,the effectiveness of the low-fuel co.sumption engine co.trol strategy was demonstrated by co.paring the simulated and field test results.

关键词： Fuel co.sumption heavy-duty co.mercial vehicle engine co.trol optimal co.trol

Research on the Establishment and Application of Demand Value Analysis Model for automobile Products

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Research on the Establishment and Application of Demand Valu...

Research on the Establishment and Application of Quantitative Sco.ing Standards for Each Dimension Based on QFD Model

2021中国汽车工程学会年会暨展览会

作者： Xiong Yu Yuan Heng Zeng Wensheng Zhou Junwu dongfeng liuzhou automobile co. Ltd

An innovative method of value analysis of automobile product demand is proposed which includes two sub models:creative demand value and co.mercial value *** creative demand analysis model can be employed to analyze the various demands in the early stage that the customers have no *** the prototype samples or advanced technologies are developed acco.ding to screening high value demand,the customer can be organized to experience this,and then co.mercial value analysis model is used to make co.mercial investment *** method improves the limitation of Kano model analysis,which can be used and popularized as a demand decision analysis tool in the product development of *** demand analysis method is carried out with practical cases,which can improve the decision efficiency and quality in the early stage of automobile product development,shorten the development cycle and reduce the development co.t.

关键词： automobile product customer and user demand demand value analysis model investment decision

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Research on the Establishment and Application of Quantitativ...

The Study and Optimization of Gearbox Whine Noise in the Cab of co.mercial Vehicle

2023中国汽车工程学会年会暨展览会

作者： Zou Zengliang Yuan Heng Hu Xiting Lin Weixiong dongfeng liuzhou automobile co. Ltd

QFD tools model as to carry out customer demand oriented important tool for product development,applied more and more often in the development of new product innovation process,to enhance customer satisfaction,improve the market co.petitiveness of products,and to product development business *** in the process of tool use,industry appeared to be too subjectively into straight evluation,there is no detailed grading basis and *** this reason,this article is based on QFD model direct sco.e in the four evaluation dimensions objective research,work out the hierarchical multilevel index system,the quantitative criteria and operation rules of QFD tool for new product development model to promote the co.venience and support.

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The Study and Optimization of Gearbox Whine Noise in the Cab...