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SSRN 2023年

作者： Dai, Longyu Li, Shujian Li, Pengnan Zhang, Hua Wang, Zhaohui Chen, Yizhe School of Mechanical Engineering Hunan University of Science and Technology Xiangtan411201 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

In CFRP (carbon fiber reinforced plastics) drilling, the thrust force induced by the main cutting edge of drill bit is a crucial factor affecting the quality of hole-making. The cutting speed induced by the spindle speed can cause changes in the strain rate of CFRP materials, which affects their cutting performance and further affects the thrust force. Therefore, the cutting speed is a factor that cannot be ignored in studying the drilling mechanism of CFRP. In this paper, the contact state between the main cutting edge and the workpiece materials in CFRP drilling is analyzed, the failure models of fibers are separately established under the action of the main cutting edge and its rake face, the material strain rate caused by cutting speed is calculated. Ultimately, the prediction model of thrust force induced by main cutting edge in CFRP drilling considering the influence of cutting speed is developed, and the accurate solution of fiber fracture process is realized. The reliability of the prediction model is verified by conducting experiments on drilling CFRP. Results indicate that compared to the case without considering the influence of cutting speed, the proposed model can improve the prediction accuracy of 9.8%-29.2% in the spindle speed range of 7000-11000 rpm. Additionally, the influence mechanism of cutting speed on material strain rate, modulus, and machining damage during CFRP drilling is revealed. © 2023, The Authors. All rights reserved.

关键词： Strain rate

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Experimental Investigation of the Two-Phase Flow Distribution and Pressure Drop Characteristic within the Cathode Bending Type Channel of Pemfc

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SSRN 2023年

作者： Li, Yongchao Zhou, Hui Li, Chenyu Lu, Chihua Liu, Zhien Xie, Liping Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China College of Mechanical Engineering & Automation Fuzhou University Fuzhou350108 China

The accurate prediction of the two-phase flow distribution within the channel is of great significance for enhancing fuel cell water management and improving output efficiency. In current study, a novel transparent fuel cell visualization test system is constructed, with the bending type channel derived from the branch channel of the actual vehicular fuel cell as the analysis object. The characteristics of the two-phase flow pattern, channel pressure drop and the cell voltage of both the straight section and the bent section in the flow channel were investigated emphatically. The results show that the bent structure of the flow channel exerts negligible influence on the distribution of the two-phase flow pattern and the amplitude of the channel pressure drop. However, as the flow channel approaches its outlet, the probability of two-phase flow occurrences increases. In addition, there are obvious differences in the time-domain curves of the pressure drop between the straight and bent sections of channel under slug flow, which is caused by the deformation of the slug volume and the effect of gravity in the bent section. The output voltage jump resulting from the slug removal has no apparent correlation with the channel structure and pressure drop, but has a clear positive correlation with the current density. The findings will provide theoretical guidance for two-phase flow prediction within the channel and flood prevention of the fuel cell. © 2023, The Authors. All rights reserved.

关键词： Pressure drop

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Effect of Mechanical Vibration on Phase Change Material Based Thermal Management System for a Cylindrical Lithium-Ion Battery at High Ambient Temperature and High Discharge Rate

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SSRN 2023年

作者： Zhou, Zijian Chen, Sheng Du, Wenhui Wu, Yuanhao Yu, Yang Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan China School of Computing Engineering and Built Environment Glasgow Caledonian University Glasgow United Kingdom

The performance and safety of lithium-ion batteries in electric vehicles depend strongly on the operating temperature, so an effective battery thermal management system (BTMS) is essential. Battery thermal management technology based on phase change material (PCM) is currently considered to be one of the most promising approaches. Electric vehicles are inevitably affected by vibration during operation, and many studies have shown that mechanical vibration can enhance natural convection heat transfer. However, the influence of mechanical vibration on the thermal field is usually neglected in many current types of research on PCM-based BTMS. The effect of mechanical vibration on the PCM-based battery thermal management module of a single cylindrical lithium-ion battery at high ambient temperature and high discharge rate is studied by numerical simulation for the first time in this paper. N-octadecane was selected as the PCM application in the cylindrical battery's periphery, and the PCM's thickness was selected as 3mm, 6mm, 9mm and 12mm. The vibration frequency is selected as 10Hz, 20Hz, 30Hz and 50Hz, and the vibration amplitude is 4mm, 20mm, 40mm and 100mm, respectively. The results show that mechanical vibration enhances the heat transfer of natural convection to limit the excessive temperature rise and improve temperature uniformity of the lithium-ion battery, and when the PCM is 12mm, the mechanical vibration has the most significant impact on the PCM-based BTMS. The battery thermal management module has the best cooling effect when the vibration frequency is 10mm, the battery temperature uniformity is the best when the frequency is 50mm. Besides, the cooling effect and the temperature uniformity are the best when the vibration amplitude is 100mm. This research provides a new perspective on the thermal management system of lithium-ion batteries for electric vehicles. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Residual Value Evaluation of Operating Pure Electric Vehicles Based on Machine Learning 7

Residual Value Evaluation of Operating Pure Electric Vehicle...

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2021 7th International Conference on Manufacturing technology and Applied Materials, ICAMMT 2021

作者： Wang, Yujiu Huang, Miaohua Chen, Kailun Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Research Center for New Energy and Intelligent Connected Vehicle Wuhan University of Technology Wuhan430070 China

In view of the current imperfect second-hand evaluation system for new energy vehicles, there are limitations such as simple evaluation models, strong subjectivity, and large evaluation differences. This paper establishes the residual value evaluation model for operating pure electric vehicles, combining actual vehicle operation and maintenance data and establishes the residual value rate evaluation model based on the XGBoost algorithm and Boosted Trees enhanced algorithm. The multi-dimensional feature data of vehicle type, service time, mileage and region are extracted by feature engineering, and the evaluation system of residual value rate correction coefficient is established based on AHP. Finally, based on residual value rate evaluation model and the residual value rate correction coefficient system model to optimize the replacement cost method evaluation model, thereby constructing a complete residual value evaluation model. The model is based on actual vehicle operating data and machine learning algorithms, which has strong pertinence and real-time for the residual value evaluation of pure electric vehicles. © Published under licence by IOP Publishing Ltd.

关键词： Machine learning

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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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Influences of key Forging Parameters on Cold Orbital Forging of Thin Parts with High Circular Ribs 13th

Influences of Key Forging Parameters on Cold Orbital Forging...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Zhuang, Wuhao Han, Xinghui Hua, Lin Feng, Wei School of Automotive Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783030753801

In this paper, a cold orbital forging process is proposed to manufacture thin parts with high circular ribs. First, a FE model was established for the numerical process analysis. Then a verification experiment was performed to verify the validity of the FE model developed above. By using the FE simulation method, the influences of several forging parameters on the cold orbital forging of thin parts with high circular ribs were investigated. The results show that effective strain can be obviously improved by increasing feed velocity of cavity die, but has less change with different friction factors. Synchronism of metal flowing between the inner rib and the outer rib can be improved by decreasing feed velocity of cavity die and friction factor. Moreover, the circumferential metal flowing degree can be slightly reduced by increasing feed velocity of cavity die and friction factor. © 2021, The Minerals, Metals & Materials Society.

关键词： Friction

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A Multivariable PID Controller Design Algorithm for Active Suspensions

A Multivariable PID Controller Design Algorithm for Active S...

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第34届中国控制与决策会议

作者： Zhou Peng Guo Huiru Feng Zhi-Yong Hubei Provincial Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Hubei Provincial Collaborative Center for Automotive Component Technology Wuhan University of Technology

For the active suspension control system,selecting sprung mass velocity and suspension deflection as controller inputs and active force as controller output,this paper considers a multivariable PID controller design problem with pole configuration and H performance *** the PID control problem into a static output feedback control problem and using the coordinate transformation matrix optimization method,this paper develops an algorithm to design the parameters of the multivariable PID ***,MATLAB/Simulink is used to analyze the performance of this *** results show that the multivariable H PID active suspension controller obtained by this design algorithm significantly enhances the vehicle ride comfort,while ensuring good handling stability and meeting the mechanical constraints of suspension.

关键词： Active Suspensions H_∞ Control Pole Assignment Multivariable PID Coordinate Transformation Matrix

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Surface-strengthened thermal stable gradient nanostructured CSS-42L fabricated by ultrasonic shot peening and subsequent annealing

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Materials Today Communications 2025年 46卷

作者： Song, Chao Wang, Guangchao Zhao, Xinhao Han, Qingyou Yin, Fei Hubei Longzhong Laboratory Hubei Xiangyang441000 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China AECC Zhongchuan Transmission Machinery Co. Ltd Changsha410219 China School of Mechanical Engineering Southeast University Jiangsu Nanjing210009 China

Grain refinement from the microscale to the nanoscale significantly enhances the performance of metals. Ensuring stable grain size and mechanical properties at high temperatures is critical for the production and utilization of nanomaterials. In this work, we fabricated average surface ferrite size of 33.9 nm gradient nanostructured CSS-42L using ultrasonic shot peening (USP). To investigate the stability of the nanocrystals at service temperature of 500 °C, the gradient heterogeneous nanostructured samples were annealed at temperatures ranging from 300 to 600 °C for 30 minutes, followed by exposure at 500 °C for one week. The results show that the average surface ferrite size stable at 38.4 nm after annealing at 400 °C, and it stabilized at 36.4 nm after one week of heat preservation, demonstrating the significant stability of the gradient nanostructure. Therefore, the optimal surface strengthening process for CSS-42L is USP-15 min+ AT-400 °C. Fundamental mechanisms of surface nanocrystallization and stable ferrite size are discussed based on both experimental and simulation results. © 2025 Elsevier Ltd

关键词： Nanocrystalline materials

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Phase-field modeling of dendritic growth of magnesium alloys with a parallel-adaptive mesh refinement algorithm

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China Foundry 2021年第6期18卷 541-549页

作者： Bing-hui Tian Meng-wu Wu Ang Zhang Zhi-peng Guo Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

A two-dimensional phase field(PF)model was developed to simulate the dendritic solidification in magnesium alloy with hcp crystal *** applying a parallel-adaptive mesh refinement(Para-AMR)algorithm,the computational efficiency of the numerical model was greatly *** on the PF model,a series of simulation cases were conducted and the results showed that the anisotropy coefficient and coupling coefficient had a great influence on the dendritic morphology of magnesium *** dendritic growth kinetics was determined by the undercooling and equilibrium solute partition coefficient.A significant finding is acquired that with a large undercooling,the maximum solute concentration is located on both sides of the dendrite tip in the liquid,whereas the maximum solute concentration gradient is located right ahead of the dendrite tip in the *** dendrite tip growth velocity decreases with the increase of the equilibrium solute partition coefficient,while the variation trend of the dendrite tip radius is the *** analysis was carried out relating to the dendritic morphology and growth kinetics,and the simulated results are consistent with the theoretical models proposed in the previously published works.

关键词： magnesium alloy dendritic growth phase-field modeling solidification

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Customer Perceived TCO and BEV Platform Development Approach

Customer Perceived TCO and BEV Platform Development Approach

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作者： Tie-bing ZHANG Miao-hua HUANG School of Automotive Engineering Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Component Wuhan University of Technology Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Hubei Research Center for New Energy and Intelligent Connected Vehicle Wuhan University of Technology

The attention to customer perception factors is helpful for automobile companies to better implement "customer-oriented" product development *** this paper, customer perception factors are introduced into TCO framework, and BEV TCO model based on customer perception is established. Compared with TCO model without comprehensive introduction of customer perception factors, comparison calculation shows that introduction of customer perception factors can help identify real customer needs more effectively and improve the pertinence of product *** on MATLAB GUI and '0-1' integer programming method, this paper builds a development tool for BEV platform based on customer perceived TCO, it can realize TCO target setting, analyse TCO optimization alternative schemes and propose decisionmaking suggestion for achieving TCO target. Using the development tool set up in this paper, TCO optimization is carried out on a vehicle model of BEV platform which is under development and achieved optimization goal, indicating that the development tool is beneficial to guide the development of BEV platform.

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