检索结果-内蒙古大学图书馆

Research on Anode Pressure Control and Dynamic Performance of Automotive Fuel Cell System

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Wei, Heng Du, Changqing Li, Xingyi Shi, Chenxu Zhang, Jiaming Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Research Center for New Energy & Intelligent Connected Vehicle Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China

The anode pressure supply meeting the system power demand can not only improve the performance output of proton-exchange membrane fuel cell (PEMFC), but also effectively prevent the degradation of proton-exchange membrane (PEM) caused by the fluctuation of anode and cathode pressure. In this article, a practicable feedforward-based proportional-integrative (FFPI) anode pressure control strategy is designed and successfully applied to a 100 kW-class automotive PEMFC system, where the current and anode purging are considered as interferences to apply feedforward compensation. The fuel cell system test bench exhibits good dynamic performance in load change experiments, the cell voltage consistency, power generation efficiency and hydrogen utilization of the system remain at a high level. To further suppress interference and reduce overshoot, oscillation and pressure response hysteresis, a control-oriented model of this 100 kW PEMFC system is constructed, and a novel second-order fuzzy active disturbance rejection controller (SOFADRC) is designed. Simulation results suggest that the proposed SOFADRC is superior than the FFPI controller and the second-order ADRC (SOADRC). The maximum absolute error (MAE), average absolute error (AAE), and root-mean-square error (RMSE) of SOFADRC all reach the minimum values respectively under the step-load and China light-duty vehicle test cycle (CLTC) load conditions, which are 6.51 kPa, 0.09 kPa, 0.42 kPa and 8.95 kPa, 0.62 kPa, 1.35 kPa respectively, showing the outstanding control effect. © 2023, The Authors. All rights reserved.

关键词： Fuzzy logic

Involvement of Right Superior Frontal in Distracted Driving

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Shi, Changcheng Yan, Fuwu Zhang, Jiawen Yu, Hao Peng, Fuming Yan, Lirong 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 Hubei Research Center for New Energy & Intelligent Connected Vehicle Wuhan University of Technology Wuhan430070 China

Differences and correlations in brain area activation between driving distractions (visual, auditory, or cognitive distraction) and normal driving were compared among 30 subjects using electroencephalogram (EEG). Visual, auditory and cognitive subtasks were designed, which occurred randomly during simulated driving, to investigate the effects of different distractions on drivers' neural activities. We found the right intraorbital superior and the infraorbital frontal gyrus were significantly activated during visual distraction. The left and right dorsolateral frontal gyrus were significantly activated during auditory distraction. The right intraorbital superior, infraorbital, and dorsolateral superior frontal gyrus were significantly activated during cognitive distraction. Therefore, prefrontal cortical areas, especially the right frontal cortical area, are most affected by distracted driving. © 2022, The Authors. All rights reserved.

关键词： Electroencephalography

Visual Design of Automotive Braking System

学校读者我要写书评

暂无评论

Visual Design of Automotive Braking System

2011 Eighth International Conference on Fuzzy System and Knowledge Discovery(第八届模糊系统与知识发现国际会议 FSKD 2011)

作者： Jie Zhang Xuexun Guo Wei Zhang Hu Sun Bin Wang CAD Center School of Mechanical Science and Engineering Huazhong University of Science and Technolo Hubei Key Laboratory of Advanced Technology of Automotive Parts School of Automobile Engineering Wu

Based on the object-oriented technology, a visible interactive platform for braking system is developed by making use of Visual C++ 6.0 development tool. By using the VC++ and doing secondary development on other softwares, the software possesses powerful features, such as brake plan selection, performance calculation, parametric modeling, kinematics simulation, etc With the help of visualization, the software can help the users take part in the design process and improve the design efficiency.

关键词： braking system visible design man-machine interface objected-oriented design

The Influences of Process Parameters on the Preparation of Closed-cell Aluminum foam by Friction Stir Processing

学校读者我要写书评

暂无评论

Research Square

Research Square 2021年

作者： Pang, Qiu Wu, Zhengjian Hu, Zhili Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 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 the present investigation, the closed-cell Al foam was fabricated by friction stir processing (FSP) combined with heat treatment. The influences of process parameters on microstructures of closed-cell Al foam precursor were investigated by optical metallographic microscope and scanning electronic microscope (OM/SEM). Fluent CFD software was developed to simulate the temperature field and flow field in friction stir processing. The cupping test values were compared for base metal and different weld passes. The results show that the welding speeds have little effect on the mixing of powder in the stir zone because of the relatively small welding heat input. However, the pore size and pore morphology are highly sensitive to change in the rotating speeds. When the welding speed is 50mm/min and the rotating speed is 2000rpm, the powder ring is continuous and uniform due to sufficient plastic deformation and flow. When the foaming time is 110s, the expansion rate of the whole foam increases rapidly, and the diameter of the pore is uniform. Numerical simulation shows that the welding heat mainly comes from the shoulder of the stirring head and the welding temperature peak appears near the stirring pin. The maximum flow velocity appears at the outer edge of the shaft shoulder in which the aluminum matrix is softened preferentially. When the rotating speed increases to 2000r/min, the velocity of the outermost edge of the shaft shoulder increases by 59.96%, and the maximum temperature at the stirring pin reaches 491℃ which is consistent with the experimental results. The formability of the joint interface is improved. The cupping test values increase with the increase of deformation temperature. Especially the cupping test value of foamed preform is close to that of base metal at 450℃. © 2021, CC BY.

关键词： Microstructure

The wear behaviours of G20CrNi2MoA carburised steel under different temperature

学校读者我要写书评

暂无评论

International Journal of Computational Materials Science and Surface Engineering 2020年第2期9卷 134-146页

作者： Zeng, Songwen Qian, Dongsheng Wang, Feng School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan430070 China Hubei Engineering Research Center for Green Precision Material Forming Wuhan430070 China

The wear behaviours of G20CrNi2MoA carburised steel under different temperature was investigated in this work. The microstructure and morphology of the worn surface and cross-section of the specimen were characterised by scanning electron microscope (SEM). It is found that the average friction coefficient increases from 0.464 to 0.563 and the wear rate increases from 3.0 × 10–6 mm3N–1m–1 to 21.1 × 10–6 mm3N–1m–1 with the increase of temperature from room temperature (RT) to 200oC. The percentage of oxygen content on the worn surface increases from 11.66% to 36.12% with the increasing temperature, and the main wear mechanism changed from abrasive wear to oxidation wear. The average diameter of the carbides at the subsurface increases from 0.16 μm to 0.24 μm with the increase of temperature. Additionally, the micro crack and voids can be found around the large carbides at 200oC, resulting in the increase of wear rate. Copyright © 2020 Inderscience Enterprises Ltd.

关键词： Carbides

10-Hz Repetitive Transcranial Magnetic Stimulation over the Frontal Eye Field Modulates Feature-Based Attention

学校读者我要写书评

暂无评论

10-Hz Repetitive Transcranial Magnetic Stimulation over the ...

Intelligent Supercomputing and BioPharma (ISBP), International Conference on

作者： Ningna Li Fuwu Yan Lirong Yan Yibo Wu Biao Xiang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China Tumxuk Xinguang Jingwei UAV Technology Co. Ltd Tumxuk Xinjiang China

The frontal eye field (FEF) is an important brain area related to visual feature-based attention (FBA). In this study, we applied 10-Hz repetitive transcranial magnetic stimulation (rTMS) to the right FEF (rFEF), designed an improved version of attention network test (ANT) with two attributes (direction and color), to explore the relationship between rFEF and the attentional network (including alerting, orienting and executive control network) and between rFEF and visual FBA. 24 healthy subjects completed the improved ANT after stimulation. The sham stimulation experiment was set as the control group. The experimental results show that the stimuli applied to rFEF can not significantly affect the attention subnetwork. However, rFEF, as a part of the frontoparietal network, affects the relevant connections of the frontoparietal network after a short local stimulation, thereby significantly reducing the reaction time of the subjects. In addition, rFEF is closely related to attribute selection in visual FBA tasks, which has been confirmed.

关键词： Visualization Brain Transcranial magnetic stimulation Color Task analysis

The Gas Production Characteristics and Catastrophic Hazards Evaluation of Thermal Runaway For LiNi0.5Co0.2Mn0.3O2 Lithium-Ion Batteries Under Different Socs

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Qi, Chuang Liu, Zhenyan Lin, Chunjing Liu, Dinghong Li, Zhaoyang Yi, Aibin Key Laboratory of Advanced Manufacturing Technology for Automobile Parts Ministry of Education Chongqing University of Technology Chongqing400054 China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and Technology China CATARC（Changzhou）Automotive Engineering Research Institute Co. Ltd China Co. Ltd China

Lithium-ion batteries (LIB) are widely used as electrochemical energy storage systems in electric vehicles due to their high energy density and long cycle life. However, fire accidents present a trend of frequent occurrence caused by thermal runaway (TR) of LIBs, so it is especially important to evaluate the catastrophic hazards of these LIBs. This study conducted the adiabatic TR test coupled gas production test, Gas Chromatography-Mass Spectrometry test, and explosion limit test on a commercial LIB with Ni0.5Co0.2Mn0.3 as the cathode material at different states of charges (SOCs). The results show that the TR temperature and the maximum temperature at low SOC are lower compared to that at a high SOC. The probability of LIBs TR at less than 50% SOC is small also causing less harm. For the gas production characteristics, the lower the SOC of the battery, the lower the gas production volume. The peak and steady-state gas production increase with the increase of SOC. For the mixed gas generated during thermal runaway, the content of CO2 shows a trend of decreasing with the increasing of battery SOC, while that of H2 and CO increases with the increasing of SOC. For the explosion limit of the mixed gas, the lower explosion limit and upper explosion limit decreases and increases with the increasing of SOC, respectively. Finally, by using the analytic hierarchy process method, the safety level of LIBs at different SOCs is evaluated with seven parameters obtained from the experimental results, which we believe enlightening for establishing a comprehensive quantitative evaluation method for battery safety in practical engineering applications. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Research on Multi-Target Detection in Complex Traffic Environment Based on Improved Dino

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Jia, Jiaxuan Guo, Wei Zhang, Ziyi Cai, Yonghua Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Hubei Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Hubei Wuhan430070 China Hubei Technology Research Center of New Energy and Intelligent Connected Vehicle Engineering Hubei Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China

Multi-target detection is a key component of the autonomous driving perception task, providing indispensable information for autonomous vehicles in rapidly changing traffic scenes. In this paper, we propose an improved multi-target detection algorithm for DINO, addressing the issue of low detection accuracy for small and occluded targets in traffic scenes. By incorporating a Mosaic data enhancement structure, the dataset's richness is increased, thereby improving the algorithm's robustness in detecting small targets;by adding a BiFPN multi-scale fusion network, the extraction ability of regions of interest at different scales is enhanced through the dual fusion of high-level and low-level features;pedestrians, cyclists, cars, and trucks are chosen as the targets in the traffic scenario. To equalize the proportion of the four target types, pedestrians, cyclists, and trucks from the SODA10M dataset are integrated into the BDD100K dataset, creating a new, balanced dataset. Experimental results show that the improved detection model increases recognition accuracy by 2.4% for vehicles, 2.3% for trucks, 5.4% for pedestrians, and 4.4% for cyclists. Finally, the improved DINO model is converted to ONNX format and tested under various working conditions in a campus environment. The results indicate that the algorithm performs well, with good model convergence, particularly in dense scenes and for small-scale targets, and the ONNX format significantly enhances detection speed. © 2024, The Authors. All rights reserved.

关键词： Autonomous vehicles

Deformation characteristics analysis of the fineblanking-extrusion flanging process

学校读者我要写书评

暂无评论

Procedia Manufacturing 2020年 50卷 129-133页

作者： Yanxiong Liu Yuwen Shu Han Chen Zuowei Zhang Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan 430070 China School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China

Nowadays, lots of flanging parts formed with the sheet metal have been widely used in the automotive industry. The fineblanked-extrusion flanging process can be used to fabricate the sheet metal flanging parts with high surface quality, high dimensional accuracy and production efficiency when compared with the conventional hole flanging process. In this paper, the process parameters were mathematically analyzed firstly, and the relationship between the punch displacements in fineblanking process H 1 and in extrusion process H 4 was presented. Then, a finite element model was created and verified by comparing with the experimental result. Using the valid finite element model, the forming load, metal flow, and damage distributions during the forming process were comprehensively analyzed, and the relationship between the workpiece thickness, flange wall thickness and the flange height has been revealed. Based on these simulation results, the deformation mechanism of the fineblanked-extrusion flanging process was revealed.

关键词： Sheet metal fine-blanking extrusion flanging Deformation characteristics