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23 September 2024, Volume 49 Issue 18 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
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New Energy Vehicle

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Analysis of Mechanical Properties of Scroll Compressor Drive Bearing for Electric Vehicles YUAN Mengli1 , YANG Bin*1 , LI Annan1 , GAO Feng1 , GE Mengqi1 , LUO Pengkang2 2024, 49(18): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2024.018.001 Abstract ( )   PDF (1581KB) ( )   The purpose of this paper is to delve deeply into the issue of bearing wear in electric vortex compressors caused by disturbances from gas forces during operation. It elaborates extensively on the interference of gas forces on the equilibrium state of the transmission system and analyzes the adverse effects of vibrations on the driving bearings and overall machine performance. To enhance the accuracy and reliability of the rotor system in the vortex compressor, threedimensional structural models and multi-body dynamics model of the rotor system are separately established using the 3D modeling software CATIA and the multi-body dynamics analysis software ADAMS. Through the simulation analysis of the specific speed, the stress of the drive bearing is studied, and the parameters of the related parts are optimized through the design research. The research results show that the force of the driving bearing presents a significant periodic change, especially in the x and y directions, resulting in secondary unbalance of the system. Through optimization, the force of the driving bearing is reduced, the friction and wear of the bearing are reduced, the service life is increased, the stability of the scroll compressor is improved, and the vibration and noise of the system are reduced. References | Related Articles | Metrics

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Finite Element Analysis of Battery Quick Change Device for Battery Electric Vehicle SUN Jun, BI Weisheng* , CHEN Xuan, LI Zhiming, ZHAO Yan 2024, 49(18): 7-14.  DOI: 10.16638/j.cnki.1671-7988.2024.018.002 Abstract ( )   PDF (5083KB) ( )   To address the long charging time of battery electric vehicles, a mechanical battery quick-swap mechanism that allows for fast and convenient battery pack replacement has been developed. Using ANSYS Workbench software, the article establishes a finite element model of the mechanism and conducts static mechanical analysis and modal analysis for scenarios such as emergency braking, steering, and bumpy roads. The results of the static analysis indicate that the maximum stress of each component under the three road conditions is less than the material yield strength, satisfying the strength design requirements. The modal analysis results show that the frequencies generated by the three externals excitation deviate from the natural frequency of the mechanism, thus preventing resonance during driving. The research findings provide a theoretical reference for the design and optimization of the battery swap mechanism. References | Related Articles | Metrics

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Application and Analysis of Flow Boiling Heat Dissipation in the Spiral Channel of Hub Motor WANG Chunliang, LIAN Jinyi, MU Xinmao, LIU Yuemao, GENG Disheng 2024, 49(18): 15-20.  DOI: 10.16638/j.cnki.1671-7988.2024.018.003 Abstract ( )   PDF (1322KB) ( )   To address the temperature rise issue of hub motors in distributed drive pure electric vehicles, this article adopts a new spiral channel flow boiling heat dissipation method for heat dissipation, and uses Fluent software to simulate and analyze its heat dissipation characteristics. Selecting a 10 kW permanent magnet synchronous hub motor as the research object, finite element simulation analysis is conducted on the flow boiling heat dissipation and water cooling heat dissipation of a spiral channel with a coolant of R134a based on the operating conditions of the hub motor under peak conditions. The flow rate and boiling point are used as variables to study the flow boiling heat dissipation characteristics of the spiral channel. The research results indicate that the heat dissipation effect of flow boiling in spiral channels is positively correlated with flow velocity and negatively correlated with boiling point. When the boiling point of R134a is controlled at 8 ℃, the heat dissipation effect of flow boiling in spiral channels is better than that of water cooling, and this advantage becomes more obvious with the increase of flow velocity. Therefore, adopting new heat dissipation methods is of great significance in reducing the temperature of hub motors and improving their performance. References | Related Articles | Metrics

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Research on Damping Characteristics of Electromagnetic Regenerative Damper with Paralleled Traditional Damper CUI Dandan, YIN Qian, LI Yarong 2024, 49(18): 21-27.  DOI: 10.16638/j.cnki.1671-7988.2024.018.004 Abstract ( )   PDF (914KB) ( )   The electromagnetic regenerative damper simply relies on the motor to provide damping force. On the one hand, the motor power is too small, resulting in insufficient damping force, and on the other hand, the motor power is too large, resulting in uncontrollable cost. On this basis, this paper proposes the scheme of parallel connection between electromagnetic regenerative damper and traditional damper. Simulink is used to establish the vehicle simulation model containing energy regenerative system, and the motor power and parallel damping are determined by simulation analysis of vehicle performance, so as to provide optimal damping force while controlling cost, so as to ensure good vehicle performance. At the same time, a method is proposed to improve the damping characteristics of paralleled traditional damper, which can recover more energy by motor while improving vehicle performance. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Line Control System for Autonomous Vehicles Based on CAN Protocol SU Haidong1 , ZHANG Wu1 , CAO Jun2 2024, 49(18): 28-33,42.  DOI: 10.16638/j.cnki.1671-7988.2024.018.005 Abstract ( )   PDF (3285KB) ( )   With the advancement of automatic control concept and automotive electronic control technology, more and more X-by-wire technology has been applied in the automotive field. This paper aims to explore the application of intelligent vehicle chassis and drive-by-wire technology. Through innovative modification of the hardware system of the experimental vehicle, including optimization of key components such as drive-by-wire steering and drive-by-wire control, and integration of specific sensors, CANTest software is used to analyze the change rule of signal frame data, so as to verify that the experimental vehicle have controller area network (CAN) communication function after hardware modification. This research can provide substantial support for the development of intelligent driving technology, and provide a relatively perfect scheme for the existing vehicle drive-by-wire transformation and communication control. References | Related Articles | Metrics

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Design and Research on Information Security of Vehicle Remote Diagnosis WANG Na, LIU Xu, HU Qiwen, LUO Hao, LIN Huiwen 2024, 49(18): 34-37,49.  DOI: 10.16638/j.cnki.1671-7988.2024.018.006 Abstract ( )   PDF (859KB) ( )   Intelligent vehicles commonly utilize remote diagnostic technology to obtain information about the vehicle's operational status and efficiently resolve vehicle malfunctions. To prevent hackers from exploiting security vulnerabilities in the remote diagnostic system for unauthorized operations that threaten the safety of users' lives and property, this paper conducts information security design and research based on a general remote diagnostic system architecture. Through detailed security threat and risk analysis, this study thoroughly investigates information security protection schemes and key technologies (such as identity authentication, secure storage, etc.), and adopts effective implementation plans. By reverification of threat analysis and risk assessment, it can significantly enhance the protective capabilities of the remote diagnostic system and reduce information security risks. References | Related Articles | Metrics

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Research on the Driving Comfort of Intelligent Cruise System for Hybrid-powered Vehicle ZHONG Peiwen, ZHOU Danfeng* 2024, 49(18): 38-42.  DOI: 10.16638/j.cnki.1671-7988.2024.018.007 Abstract ( )   PDF (1138KB) ( )   In this paper, the problem of vehicle setback control with assistant driving adaptive cruising function is analyzed, and the driving comfort is optimized by adding negative torque request decision logic tou pper controller. In the course of car-following, the linear motion smoothness of the front and rear directions of the vehicle is improved when the vehicle is controlled lengthways to decelerate, so as to achieve a smooth and comfortable subjective driving feeling, it provides an effective solution for the following vehicle development, assistant driving and adaptive cruising function tuning. With the optimization and perfection of the function and performance of vehicle assistant driving, the problem of comfort perception of intelligent driving will be better, and the technology of intelligent driving will be developed rapidly. References | Related Articles | Metrics

Design and Research

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Optimized Design of Diesel Engine Connecting Rod Based on Hierarchical Optimization Strategy PING Siliang1 , WANG Xing1 , BAI Yu2 2024, 49(18): 43-49.  DOI: 10.16638/j.cnki.1671-7988.2024.018.008 Abstract ( )   PDF (1673KB) ( )   Because the diesel engine connecting rod is subjected to complex forces during high-speed movement, the optimization of the connecting rod has been facing a single-objective, multiconstraint and multi-parameter optimization problem, which leads to complex calculations and is not easy to converge. Based on the finite element method and structural optimization theory, the simulation model of a diesel engine connecting rod is established in the paper, and the connecting rod is optimized by using the hierarchical optimization method and direct optimization method respectively. The results show that compared with the traditional direct optimization method, the hierarchical optimization method is better convergence of the objective function of each layer, 48% improvement of the computational efficiency, 11.74% weight reduction of the connecting rod after optimization, 13.6% decrease of the maximum stress, and 9% decrease of the maximum deformation. The study puts forward a new idea for the design and optimization of engine connecting rods, which can provide a useful reference for the optimization design of complex mechanical structures. References | Related Articles | Metrics

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Research on Ride Comfort of Off-road Vehicle Based on Nonlinear Bionic Suspension RONG Chaoren, SONG Yong, LI Zhanlong, QIAN Jiangning, HU Xi'an 2024, 49(18): 50-55.  DOI: 10.16638/j.cnki.1671-7988.2024.018.009 Abstract ( )   PDF (2389KB) ( )   Aiming at the problem of poor ride comfort of off-road vehicles with traditional linear suspension, this paper proposes an off-road vehicle ride comfort improvement scheme based on double diamond bionic kangaroo leg suspension (hereinafter referred to as bionic suspension), and studies the influence of bionic suspension arrangement scheme, spring stiffness ratio and body offset frequency ratio on vehicle ride comfort. The results show that: 1) The bionic suspension has obvious nonlinear stiffness characteristics, and the characteristics are enhanced with the increase of the spring stiffness ratio. 2) Compared with other arrangement schemes, the scheme using bionic suspension on both front and rear axles has the best ride comfort. 3) When the road surface is poor, the higher the bionic suspension stiffness ratio, the better the vehicle ride; with the reduction of the static deflection ratio of the bionic suspension of the front and rear axle, the vertical vibration and pitch vibration of the body are reduced. The above results show that the off-road vehicle with nonlinear bionic suspension shows good ride comfort, which verifies the correctness and effectiveness of the proposed bionic suspension research idea. References | Related Articles | Metrics

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Development and Design of a Vehicle Central Control Door Lock Controller for Teaching Special JIANG Hua, ZHANG Chunzhao, ZHOU Peili, ZHONG Yuan 2024, 49(18): 56-60140.  DOI: 10.16638/j.cnki.1671-7988.2024.018.010 Abstract ( )   PDF (1148KB) ( )   In order to solve the problems of easily burned-out components and difficult maintenance of existing teaching and training platforms for vehicle anti-theft and central control door lock, a new vehicle central control door lock controller for teaching specific is developed and designed in this paper. The controller improves the reliability and durability of the system by controlling the poweron time, adding the short circuit protection and alarm indication circuits. By gradually improving the circuit design, scientifically demonstrating the technical difficulties, and achieving the automatic triggering, short circuit protection, and alarm indication functions. The design has the advantages of low cost, powerful functionality, and easy maintenance, and has wide promotional value, which is of great significance for improving teaching effectiveness and reducing teaching costs. References | Related Articles | Metrics

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Research on Front Bumper Beam Design Based on Facelift Vehicle LU Tao, SONG Yongle, TONG Lin 2024, 49(18): 61-64.  DOI: 10.16638/j.cnki.1671-7988.2024.018.011 Abstract ( )   PDF (1932KB) ( )   In contemporary society, people pay more and more attention to automobile safety, and the safety crash performance of automobiles has become an important reference basis for customers to buy cars. The front protection beam is a part involving the safety of the whole vehicle, and it is designed to ensure that the collision energy can be fully absorbed during the low-speed collision to ensure the normal function of the electrical components and main components in the front end. Therefore, this paper summarizes the requirements and characteristics of low speed collision, and summarizes the key elements of the design of the front protection beam. Based on the development case of a certain model, the light weight and safety optimization design of the front protection beam is carried out, which also provides a reference for the design of the front protection beam of the subsequent model. References | Related Articles | Metrics

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Research on Augmented Reality Vehicle Manual Based on EasyDL Image Recognition and SLAM Localization DONG Yunyu 2024, 49(18): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2024.018.012 Abstract ( )   PDF (6829KB) ( )   At present, there are some problems with complicated text content, difficult retrieval, strong professionalism, difficult understanding and low usage for vehicle user manual. To solve the above problems, this paper proposes an image recognition method based on the EasyDL deep learning, and then the recognized icon information is located in real-time on the icon side through visual simultaneous localization and mapping (SLAM). This method can be used to recognize the characters, geometry, and parts of the vehicle accurately, and map the recognized content with a three-dimensional way on interactive devices. The theoretical analysis and experimental results show that the method described in this paper has the characteristics of fast calculation speed, high recognition efficiency, intuitive display, easy to understand, etc., and has important practical value. References | Related Articles | Metrics

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Analysis of Jet Technology for Rotating Spray Rod Nozzles of Environmental Sanitation Vehicles LIU Yang, CHENG Xiaojian, FAN Chaojie 2024, 49(18): 70-74153.  DOI: 10.16638/j.cnki.1671-7988.2024.018.013 Abstract ( )   PDF (2097KB) ( )   Deep cleaning vehicles are a popular type of road cleaning and sanitation vehicle in the market in recent years, and the core component of deep cleaning vehicles is the rotating spray nozzle. This article analyzes the rotary spray nozzle of a deep cleaning vehicle, and compares it with the traditional linear spray nozzle of a cleaning vehicle. The rotary spray nozzle can effectively eliminate comb marks and has a better cleaning effect. However, the disadvantage is that the operating speed is relatively slow. The reason is that there is a corresponding relationship between the rotational spray nozzle speed and the vehicle speed. When the speed is lower than the critical value corresponding to the vehicle speed, a spiral line will appear on the ground, affecting the cleaning effect. At the same time, comparing the cleaning effects of active rotation and self rotation, as well as analyzing the motion of the rotating double spray bar nozzle and the rotating triple spray bar nozzle, provide better guidance for designing the rotating spray bar nozzle of deep cleaning vehicles. References | Related Articles | Metrics

Testing and Experiment

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The Establishment and Flow Field Analysis of Bending Pipe Model Based on Three Dimensional Flow MENG Jie1 , GUO Jiaxuan2 , MA Xiaochang2 , HAN Binhui3 2024, 49(18): 75-81.  DOI: 10.16638/j.cnki.1671-7988.2024.018.014 Abstract ( )   PDF (4176KB) ( )   Exhaust manifold is one of the necessary parts of the engine, which has a great impact on the performance of the engine. In this paper, the bent pipe of exhaust manifold is studied, the theoretical model of gas flow in the bent pipe is established, and the gas flow condition in the bent pipe is simulated by FLUENT software. Then the gas in two kinds of curved pipes (90°-56°pipe and 90°-90°pipe) is compared and analyzed. The results show that the gas velocity distribution, pressure distribution and flow line distribution in the 90°-90°pipeline are more uniform, the flow separation area and eddy current are relatively small, and the velocity uniformity coefficient is closer to one, which has less influence on the diesel engine intake and gives full play to the dynamic performance of the diesel engine. References | Related Articles | Metrics

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Truck Driving Axle Housing Stress Analysis under the More Condition Based on the Workbench LV Xingdong, ZHENG Minghui 2024, 49(18): 82-86.  DOI: 10.16638/j.cnki.1671-7988.2024.018.015 Abstract ( )   PDF (1442KB) ( )   Drive axle is an important part of automotive powertrain and load system, taking a type of truck drive axle housing as the research object, using UG establish the three dimensional model, according to the maximum vertical force, maximum tractive force, maximum braking force and maximum lateral force conditions, the simulation force analysis is carried out, getting the stress of the drive axle housing under different working conditions. Using the Workbench conduct simulation analysis, by adding material properties, meshing and applying reasonable boundary conditions, getting the maximum equivalent stress and maximum deformation of corresponding conditions. Through four types of analysis and comparison of the working condition, the stress under maximum braking force condition and maximum lateral force condition is larger, and the stress under these two conditions should be fully considered in the design; The deformation is greatest under lateral force condition, getting the drive axle housing likely to occur stress damage and deformation of the largest position, the position where the drive axle housing is prone to stress failure is the connection position between the axle axle sleeve and the spring fixing seat and the axle housing body, and the two positions should be rationally arranged. Research result provides the reference for the design of the drive axle housing. References | Related Articles | Metrics

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Internet of Vehicles Big Data Application Exploration in the Field of Vehicle Reliability Testing LU Haibo, CHEN Chengfeng, CHEN Chunyan 2024, 49(18): 87-91.  DOI: 10.16638/j.cnki.1671-7988.2024.018.016 Abstract ( )   PDF (1332KB) ( )   Vehicle reliability testing is an important part of the automotive development process, and the rationality of testing specifications has a significant impact on testing cost and durability performance of vehicles. With the large-scale promotion of the Internet of vehicles, it is possible to obtain accurate data on actual users with large samples. The excellent performance of big data technology in data mining capabilities provides broad space for its application in the development of vehicle reliability test specifications. This article introduces five applications of Internet of vehicles big data in vehicle reliability test specification development field: user travelling habit analysis, vehicle component operation frequency statistics, user road type proportion prediction, user driving style recognition, and user working condition formulation. It covers vehicle road and bench reliability testing, providing new ideas and reference value for the rational development of its test specifications. References | Related Articles | Metrics

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Analysis and Test Detection of Vehicle Braking LIU Xing, WANG Fanghao 2024, 49(18): 92-96.  DOI: 10.16638/j.cnki.1671-7988.2024.018.017 Abstract ( )   PDF (1588KB) ( )   As the most important component system in vehicle active safety, vehicle braking device is directly related to the safety of people and property inside and outside the vehicle, which is embodied in the performance and reliability of the vehicle braking system. In order to clarify the various factors affecting vehicle braking and the clarify methods to improve vehicle braking performance, this paper analyzes vehicle braking performance through three evaluation indexes of vehicle braking efficiency, constancy and stability, and makes a comparative study of braking test data under various roads, and expounds the key points of improving braking performance and the application of electronic control system in vehicle braking, so as to improve vehicle braking performance and reduce road safety accidents rate. References | Related Articles | Metrics

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Research on Measuring and Calculating Method of Flanging Height of Stamped Outer Parts of Doors and Covers ZHU Xiaobo, ZENG Min 2024, 49(18): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2024.018.018 Abstract ( )   PDF (1169KB) ( )   The flanging height of the stamped outer panel of the door cover directly affects the surface quality and dimensional accuracy of the door cover assembly after the flanging. In actual production, the flanging height must be accurately measured to ensure product quality. In production, the flanging height must be accurately measured to ensure product quality. This paper summarizes the problems existing in the three methods of measuring and calculating flanging height, which are manual measurement, trimming measurement and distance measurement, a new mathematical calculation method is established. The method is realized by using ATOS Scanbox optical measuring equipment, and the accurate measuring and calculating results of flanging height are obtained. At the same time, through the secondary development of ATOS measurement software, the calculation process of the method is automated. The new flanging height calculation method not only realizes the accurate measurement of flanging height, but also saves 200 h of manual labor in the new vehicle type project, and improves the efficiency of quality optimization. References | Related Articles | Metrics

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Analysis of the Longitudinal Force Condition of a Certain Type of Leaf Spring WAN Haiqiao 2024, 49(18): 102-105.  DOI: 10.16638/j.cnki.1671-7988.2024.018.019 Abstract ( )   PDF (1163KB) ( )   In commercial vehicle suspensions, leaf springs are the most widely used elastic components. In daily design, developers often focus more on the influence of vertical loads on leaf springs, while ignoring the influence of longitudinal impact on leaf springs in extreme working conditions. This article analyzes the longitudinal force of leaf springs when vehicles are subjected to longitudinal acceleration through examples, calculates their strength, and provides design considerations for leaf springs under longitudinal twisting conditions. In daily design, the design stress of the steel plate spring under vertical working conditions is 400～500 MPa, but under longitudinal torsional working conditions, it can be seen from the results that the stress of the front spring reaches 510.2 MPa, which is greater than the stress under vertical working conditions. Therefore, the stress generated by its longitudinal force should not be ignored. References | Related Articles | Metrics

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Analysis and Application Research of an Off-road Wide-body Mine Truck Driving Axle Shell Cracking Failure LIU Qi, LUO Shudong, ZHU Kang, ZHOU Boyang, FU Haoxiang, GUO Qiyuan 2024, 49(18): 106-109.  DOI: 10.16638/j.cnki.1671-7988.2024.018.020 Abstract ( )   PDF (1617KB) ( )   An off-road wide-body truck is in Inner Mongolia coal mines, as soon as it is used for a year, many cases of driving axle shell cracking and oil leakage failures appeares, and the fault form and time are highly unified. In order to solve the problem of axle shell cracking failure, the real analysis and verification model is established according to the actual working conditions investigated by following the vehicle, and the simulation analysis software is applied in combination with the working conditions characteristics of the mining area. The fault recurrence analysis is carried out on the driving axle shell cracking failure, and the root cause of the crack and oil leakage of the driving axle shell cracking is determined. Based on this, the improvement suggestion and optimization scheme are put forward for the cracking and oil leakage of the drive axle shell cracking, so that the improved axle shell can be put into the mining area for verification. After two years of use, there is no driving axle shell cracking oil leakage fault. References | Related Articles | Metrics

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Analysis and Optimization of the Reason of Fracture on a Light Truck Front Bumper WANG Zhonghao, LIU Hongmei, XU Zhaoyun, SONG Xujian 2024, 49(18): 110-115.  DOI: 10.16638/j.cnki.1671-7988.2024.018.021 Abstract ( )   PDF (1924KB) ( )   For the problem of front bumper fractured in durability test of a light truck, this paper analyzes the reason of fracture from structural mode, strength and vibration fatigue. Based on the basic principle of vibration fatigue in frequency domain and the definition method of vibration fatigue load, the torsional fatigue simulation analysis model is established and the failure causes are identified. The result shows that the risk area is consistent with the real vehicle. At the same time, the structural optimization is completed for the risk position and passed the durability test, and the analysis method is verified effectiveness, the research results can provide a reference for solving similar problems of the light truck chassis structures. References | Related Articles | Metrics

Process·Materials

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nfluence of Coupling Roller Speed on Wall Thickness of Roll Forming of Ultra-thin Walled Rings WU Xinzhou1 , SHI Mingzhi2 , WU Qingjie*2 , ZHAO Gangyao2 , WU Tao1 2024, 49(18): 116-121.  DOI: 10.16638/j.cnki.1671-7988.2024.018.022 Abstract ( )   PDF (3776KB) ( )   In this paper, the influence of the coupling speed of the drive roller and the guide roller on the wall thickness of the ultra-thin wall ring is studied by the simulation analysis and the actual test verification. The results show that the average thinning rate of the wall thickness increases with the increase of the drive roller speed. However, when coupling two rollers, the driving roller speed is 0.2 rad/s, and the coupling guide roller speed is 0.2 rad/s. When machining in the medium speed range, the increase of guide roller speed can reduce the thinning rate of ring wall thickness to a certain extent, and too high or too low guide roller speed is cause the thinning rate of material wall thickness to increase. The influence of coupling effect of roller speed on the thinning rate of ring wall and its change rule revealed in this study are helpful to improve the processing fluency and thickness consistency of metal sealing ring, and provide reference for the sealing research of automotive exhaust system and other related fields. References | Related Articles | Metrics

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Analysis of the Quality Improvement of Flow-hanging Effect on Painted Vehicle Body YANG Jiankang, LI Jifei, YUAN Qingzhu, GUO Pingsheng 2024, 49(18): 122-126.  DOI: 10.16638/j.cnki.1671-7988.2024.018.023 Abstract ( )   PDF (1598KB) ( )   Based on the flow-hanging problem of a trial-produced model of Nanjing Hengtian Lingrui in the process of surface painting workshop, combined with the actual operation situation on site, the paper systematically analyzes the flow-hanging generation principle, production line equipment status, process route formulation, staff operation methods, paint material determination and other aspects, and determine the improvement plan for body flow-hanging through process verification. And the scheme has achieved good results in practical application, and briefly analyzed the related factors affecting the paint quality of the body, and put forward some suggestions, hoping to guide and reference significance for the lean manufacturing of paint coating in the later stage. References | Related Articles | Metrics

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Research on Automotive Manufacture Process of Clamshell Hood ZHANG Qi, WANG Liying, YI Tongshuai 2024, 49(18): 127-130.  DOI: 10.16638/j.cnki.1671-7988.2024.018.024 Abstract ( )   PDF (2357KB) ( )   The clamshell style hood design of automobiles has become a highlight of automotive styling design due to its simple and novel appearance. The clamshell style hood has a large coverage area, and the side can extend downwards to the wheel arches. Compared with traditional hood, it increases the cost of parts and also affects the manufacturing process of sheet metal assemblies. The clamshell shaped hood of automobiles and its design advantages, analyzes the design factors that affect the manufacturing process, and discusses the influence of the was introduced and design angle of the A surface of the sheet metal shape and the joint position between the hood to the fender on the manufacturing process, a quantitative analysis method for product design improvement in the process of product synchronization engineering were discussed, which provides reference for the design and manufacturing of automotive clamshell hood. References | Related Articles | Metrics

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Numerical Simulation Analysis of Negative Springback in V-shape Bending of Ultra-high Strength Steel for Automobile ZHAO Xianmeng, SUN Shuwei, LI Changqing* , LIU Kun, LI Hui 2024, 49(18): 131-135.  DOI: 10.16638/j.cnki.1671-7988.2024.018.025 Abstract ( )   PDF (1629KB) ( )   In order to study the negative springback phenomenon of 1 000 MPa ultra-high strength steel in V-shape bending and improve the springback control precision of cold bending of ultra-high strength steel, in this paper, the deformation, stress and strain during bending and springback are analyzed by means of numerical simulation. It is found that in the bending process, the straight edge of the specimen will appear the phenomenon of first bending and then leveling. It is found that in the bending process, the straight edge of the specimen will appear the phenomenon of first bending and then leveling, the tensile stress in the inner side of straight edge is the fundamental cause of negative rebound. After stress unloading, the springback angle of the round corner part of the specimen increases, and the springback angle of the straight edge part decreases, both superposition makes rebound angle may appear positive or negative value, the reduction of bending radius will make the ultra-high strength steel more prone to negative rebound. References | Related Articles | Metrics

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The Application of Rapid Production Change in Production LUO Yan, HE Peng* , DENG Baofeng, LIU Qi 2024, 49(18): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2024.018.026 Abstract ( )   PDF (1067KB) ( )   With the increasing uncertainty and customisation of our manufacturing market demand in recent years, the wide variety and small batoh production approach has gradually been replaced by mode of production, so companies must be able to respond quickly to market demand, therefore, rapid production change has become an important part of the manufacturing process. Based on the analysis of HD's automated line change process, this paper optimizes, improves and standardizes the process using image analysis, Brainstorming, ECRS and other related industrial engineering ideas and methods, shorten the production change time of line body, and finally realize the cost reduction and efficiency increase of the enterprise, which reflects the great potential and value of the application of industrial engineering technology in the machinery manufacturing industry. References | Related Articles | Metrics

Automobile Education

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Exploration of the Application of Project-Based Teaching in Vocational Education Reform －Taking the Curriculum of Automotive Power System Construction and Maintenance as an Example JIN Jianjiao1 , ZHANG Chenyun2 2024, 49(18): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2024.018.027 Abstract ( )   PDF (1217KB) ( )   To meet the requirements of vocational education development, project-based teaching provides an effective pathway for cultivating high-quality technical talents with its unique advantages. The paper explores the application of project-based teaching in the teaching of the curriculum of Automotive Power System Construction and Maintenance in vocational colleges. In the design of teaching, the teaching content is optimized and reconstructed based on the current situation of diversified power systems in the market. The curriculum is modularized into one large project (the differences in the construction of multiple automotive power systems and programmed maintenance), which runs through all chapter knowledge points. Through the implementation of a complete comprehensive project, students' practical skills and technical level are improved to achieve a deep integration of theory and practice. At the same time, combined with the characteristics of automotive majors, the ideological and political elements in the curriculum are organically integrated into the curriculum to enhance the effectiveness of ideological and political education in automotive curriculum. Through the teaching comparison of two parallel classes, it is found that the class using project teaching has achieved good teaching effect. References | Related Articles | Metrics

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Research on the Digital Construction of the Course Group for New Energy Vehicle Engineering Major YAO Shenghua 2024, 49(18): 146-149.  DOI: 10.16638/j.cnki.1671-7988.2024.018.028 Abstract ( )   PDF (959KB) ( )   In order to cultivate new energy vehicle professionals who meet the needs of society and solve the problem of disconnection between higher education and social demand, university professional leaders need to continuously build professional course groups. By applying computer information technology to theoretical course teaching, practical course teaching, and teaching management of undergraduate majors, scientific research project achievements are integrated into various aspects of course teaching, and applied undergraduate senior talents that meet social needs are cultivated. The core of the digital construction of professional course groups is the teaching team and responsible persons. The process of cultivating undergraduate talents in new energy vehicle engineering needs to be continuous. The practice of course group reform has proven that digital technology is conducive to cultivating high-quality professional talents. Strengthening the digital construction of the new energy vehicle engineering course group is of great significance for improving teaching quality, promoting professional development, and cultivating high-quality talents. References | Related Articles | Metrics

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Practice and Exploration of the Course of Intelligent Connected Vehicle Underlying Design CAO Tianyi, ZHANG Chenyun 2024, 49(18): 150-153.  DOI: 10.16638/j.cnki.1671-7988.2024.018.029 Abstract ( )   PDF (1009KB) ( )   As a new course closely related to the competition among vehicle powers, the Intelligent Connected Vehicle Underlying Design can be built as a favorable position to cultivate patriotic feelings and innovative consciousness. By optimizing classroom teaching methods, the paper cultivates students' innovative consciousness, adopts the dual three-stage integration mode of "online and offline" + "before class, during class and after class", and cultivates their self-learning ability and expression ability. By carefully designing the course content and teaching methods, it nurtures students' international perspective, ignites their innovative consciousness and ability, and cultivates a new generation of patriotic "automotive professionals" who are responsible and capable. References | Related Articles | Metrics

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The Application of Project Teaching Method in the Course of Comprehensive Experiment of Automobile Structure LIU Zhenbo 2024, 49(18): 154-157.  DOI: 10.16638/j.cnki.1671-7988.2024.018.030 Abstract ( )   PDF (1467KB) ( )   In order to adapt the rapid development of the automobile industry, students can change passive learning into active learning, improve their problem analysis and solving ability, and cultivate students' comprehensive professional quality. This article combines the project teaching method with the comprehensive experimental course of automobile structure, makes full use of the assembly process of Mercedes-Benz engine factory, and decomposes the engine assembly process into multiple project tasks. This method is convenient to mobilize the enthusiasm of students to learn and complete the teaching task of engine disassembly experimental project, cultivate the comprehensive professional comprehensive ability of students majoring in vehicle engineering, and provide new teaching design ideas for the teaching reform of other practical courses and the opening of new practical courses. References | Related Articles | Metrics

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Research on the Impact of Accelerating the Development of New Energy Vehicles on Professional Curriculum Reform School of Automobile and Traffic Engineering, Liaoning University of Technology 2024, 49(18): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2024.018.031 Abstract ( )   PDF (1088KB) ( )   New energy vehicle; Professional curriculum; Curriculum reform References | Related Articles | Metrics

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Typical Ideological and Political Case Design and Application of Automobile Construction Course Based on LideShuren SUN Yuechao, LI Man, QIU Zhi, LIAO Cong 2024, 49(18): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2024.018.032 Abstract ( )   PDF (1000KB) ( )   As an important pilot who not only affects whether students can "become" and determines whether students can "become talents", teachers play a decisive role in the quality of teaching and educating people. Therefore, according to the curriculum characteristics and teaching objectives of automobile construction, through the combination of "course content=knowledge point+case+moral education", combine the knowledge points of the course with the actual typical cases, and according to the actual situation of the case, values and other moral elements of the case into the knowledge, character sublimation education for students, so that students, while mastering professional knowledge, infected and influenced by the core socialist values, truly realizes the deep integration of "knowledge imparting" and "value leading", while improving the quality of education, it also improves the education level of course teachers, it plays a positive role in promoting the curriculum construction and professional development. References | Related Articles | Metrics

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The Development Status and Trend of Automotive Intelligent Cockpit ZHANG Hong, WU Yaheng* , LIU Peiwen, DONG Yiping 2024, 49(18): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2024.018.033 Abstract ( )   PDF (1084KB) ( )   With the continuous development of new energy and intelligent vehicle industries, traditional intelligent cabins can no longer meet the demand for intelligent vehicles. Major automakers have gradually integrated and upgraded cockpit functions such as liquid crystal display instruments, information entertainment, and display screens, in order to explore safer, smarter, and more comfortable of transportation modes. This article analyzes and summarizes the current development status of intelligent cabins and the situation of major car companies loading intelligent cabins. The main development trends of intelligent cabins are summarized in five aspects, including enhancing head up display to empower driving with a new visual experience, rich cabin functions and information that still need to be based on travel safety, ruan air conditioner and zero gravity seats will empower the cabin with a new upgrade, multi-modal interaction between humans and vehicles will empower the cabin with a seamless experience, and artificial intelligence generated content (AIGC) technology will empower the cabin scene to continuously upgrade, bringing users a comfortable,convenient and safe driving experience, in order to provide reference for the development of the intelligent cabin industry. References | Related Articles | Metrics

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Analysis of Carriage Mode of the Second Class Truck Chassis XING Lei1 , KANG Yichen2 , WANG Fanghao3 , ZHANG Zhida3 , CHEN Li3 2024, 49(18): 170-175.  DOI: 10.16638/j.cnki.1671-7988.2024.018.034 Abstract ( )   PDF (1994KB) ( )   The transportation modes of the second class chassis of large and non-removable trucks violate the standard regulations, which brings safety risks to road traffic. In order to standardize the transport mode and reduce the hidden danger of road safety, the paper mainly analyzes the characteristics of different transport types from the transport status, economy, safety and regulatory compliance of the second class chassis, and further expounds the importance of formulating the special transport vehicle standard for the second class chassis transport. The purpose of this paper is to provide a useful reference for the second class chassis transport industry and promote the improvement of transport efficiency and the sustainable development of the industry. References | Related Articles | Metrics