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

作者： Deng, Jiadong Cheng, Zhe Qian, Dongsheng Liu, Jikang Wu, Rongwen School of Automotive Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Engineering Research Center for Green & Precision Material Forming Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783030753801

Double metal composite ring has the advantages of two materials, and is used in specific fields. The traditional manufacture method is welding. And some scholars try to use ring rolling process to produce a composite ring. However, the interface connection quality is not good. In this paper, a novel constructive hot ring rolling process to manufacture a seamless double metal composite ring is proposed. First, two separate rings with different metals are assembled together. And then the surface interface area on the upper and lower of the assembled ring are welded in an oxygen-free environment, which can suppress the interfacial oxidation during heating process. After that, the surface welded ring is cleaned and heated. Finally, the target double metal composite ring is formed by hot ring rolling. An experiment of constructive hot ring rolling process for double metal composite ring was done. The interface healing effect of the composite ring was studied. The result indicated that the interface healing degree was significantly improved by this method. © 2021, The Minerals, Metals & Materials Society.

关键词： Metals

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Research and Simulation of Electro-Hydraulic Braking System Based on Integrated Master Cylinder

Research and Simulation of Electro-Hydraulic Braking System ...

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SAE 2015 World Congress and Exhibition

作者： Tan, Zhihui Chen, Zhenfu Pei, Xiaofei Zhang, Jie Guo, Xuexun Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan University of Technology 205 Luoshi Road Hongshan District Wuhan430070 China Wanxiang Group Technical Center China Zhejiang Wanxiang Systems Co. Ltd. China

Analogous to a vacuum boosted system, Electro-Hydraulic Braking System (EHB) is free from engine vacuum and supplies a braking force proportional to driver input. The independence of engine vacuum makes it especially suitable to be used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). As a key component of EHB, master cylinder is driven by the pump rather than the vacuum booster. Even if the pump fails, the cylinder can also build proper pressure. Meanwhile, in order to maintain the pedal feeling, a pedal stroke simulator is applied in the system. In this paper, aiming at decreasing the size and cost of master cylinder and providing an ideal pedal feeling without compromise of performance, a new integrated master cylinder of EHB system is designed including two parts: master cylinder and pedal stroke simulator. The key components of the integrated master cylinder are motor pump, solenoid valves and composite springs. A model of the EHB and other key components of the brake system are established in AMEsim-MATLAB/SIMULINK. AMEsim is responsible for hydraulic part while SIMULINK for control part. Some parameters of the components are discussed to research their effects on system performance. In addition, to verify the system availability, the PWM method is adopted to regulate the fluid pressure in the pressure following control. Finally, braking performance is tested under three modes through the match of EHB model and vehicle model in CarSim. The simulation result demonstrates that the EHB system not only can satisfy the demands of braking system, but also conform to ideal stroke-force curve. Copyright © 2015 SAE International.

关键词： Braking performance

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The effect of ultrasonic shot peening on the fatigue life of alloy materials: a review

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International Journal of Computational Materials Science and Surface Engineering 2021年第3-4期10卷 209-234页

作者： Chen, Yun Deng, Sen Zhu, Chao Hu, Kaixiong Yin, Fei School of Logistics Engineering Wuhan University of Technology Wuhan430063 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

It is more and more widespread to introduce nano-structured grains on the surface of alloys to improve their strength. One of the technologies to achieve this is the ultrasonic shot peening (USP) technique, which has attracted special attention. With this technology, uniform nano-structured grains can be formed on the surface and compressive residual stress can be developed that can improve the fatigue life. However, pits will be formed during the USP process, which will cause stress concentration and lower the fatigue life. This paper reviews the effects of USP processing parameters on the evolution of the surface morphology, microstructure and residual stress. A finite element simulation based on the velocity model was established to simulate the impact of the USP processing on the fatigue performance. Copyright © 2021 Inderscience Enterprises Ltd.

关键词： Shot peening

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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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Heat transfer research of gas-solid-liquid three phase coupling of EGR cooler

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Research Journal of Applied Sciences, Engineering and technology 2014年第17期7卷 3425-3432页

作者： Yan, Fu-Wu Liu, Yan-Lei Liu, Zhi-En Fu, Ding-Yian School of Automobile Engineering Wuhan University of Technology Wuhan China Hubei Key Laboratory of Advanced Technology of Automobile Parts Wuhan China

The main aim of the study is to get the temperature and backpressure of a car engine exhaust gas which goes through the EGR-cooler. So the internal fluid flow and heat transfer process of the EGR cooler must be studied more clearly, numerical simulations are applied. Based on the strong coupling method, gas-solid-liquid three phases coupling model of the typical heat transfer unit is established. According to the coupling result, the heat flux of the tube's outside surface is gained and then mapped to the inner surface of the cooler's water. The water model is set up based on the separation coupling method. According to the analysis of the calculation, the detailed pressure and temperature distribution of the gas, water and solid are obtained. From the distribution cloud, we know the changes of the parameters along the fluid flows streamline. © Maxwell Scientific Organization, 2014.

关键词： CFD EGR-cooler Gas-the solid-liquid three phases coupling Heat transfer process

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Finite Element Simulation of Effect of Part Shape on Forming Quality in Fine-blanking Process

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Procedia Engineering 2014年 81卷 1108-1113页

作者： Yanxiong Liu Lin Hua Huajie Mao Wei Feng Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Wuhan 430070 China School of Material Science and Engineering Wuhuan University of Technology Wuhan 430070 China

Fine-blanking as an effective and economical sheet metal cutting process has been widely used in the precision machines, automobiles, electronics and aircraft areas. This process can produce smooth-sheared edges over the full workpiece thickness in one single operation with the optimized process parameters. However, the crack phenomenon always occurred in the fine-blanking process when the part shape is complicated. The forming quality of the part with concave and convex shape has been investigated with finite element simulation and experiment methods. In order to reveal the effect of part shape on the fine-blanking process comprehensively, a simple finite element model in which the part has convex and concave shape were created. The effects of the angle between the neighbouring edges and height of the convex and concave on the surface quality have been investigated. Furthermore, the way to design the parameters for parts with complicated shape has been discussed in this paper.

关键词： Fine-blanking Part shape Forming quality Convex and concave

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Modelling and Mechanism of Chatter in Heavy-Load Multi-Dof Plastic Forming Process

SSRN

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SSRN 2024年

作者： Han, Xinghui Lu, Yi Zheng, Fangyan Hua, Lin Zhu, Dahu Liu, Yong Chen, Xin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Wuhan University of Technology China

Processing chatter is an unstable and detrimental vibration phenomenon stemming from the regenerative excitation of time-delay dynamic systems. Currently, research on processing chatter predominantly focuses on machining process, wherein chatter occurs when the processing frequency aligns closely with the natural frequency of the tool-holder system. However, in plastic forming process conducted by heavy-load multi-DoF forming machine (MDFM), the processing frequency is far smaller than the natural frequency of the tool-holder system. Despite this, chatter still occurs in the actual plastic forming process, challenging the explanatory capacity of existing chatter models developed for machining *** paper aims to a new chatter model and a new chatter generation mechanism for multi-DoF plastic forming process (MPFP). Firstly, the flexible-rigid coupled dynamic model of the MDFM is established based on the Lagrangian method. Then, a time-delay dynamic model of MDFM is developed incorporating material deformation and tool-blank contact in forming process. Subsequently, the time-delay dynamic model is simplified based on the static position, and a stability model for MDFM is established using the fully discrete method. Based on the above dynamic and stability model, the vibration and 3D stability lobe diagram are theoretically calculated and experimentally validated, showing prediction error of vibration about 18% and that of stability about 11%. Besides, a new chatter generation mechanism different from the machining process is revealed. That is, in the machining process, chatter arises from the phase difference between the regenerative exciting force and vibration due to the high processing frequency, whereas in the forming process, chatter arises from the larger of exciting force than the damping force, namely arises from insufficient damping. This work introduces an innovative chatter model and elucidates a novel chatter generation mechanism, which holds subst

关键词： Dynamic models

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Influence of hot ring rolling on uniform deformation of High-speed rail bearing ring

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Procedia Engineering 2017年 207卷 1218-1223页

作者： Song Deng Lin Hua School of Automotive Engineering 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

Bearing ring blanks of the high-speed rail bearings, machine tool spindle bearings and wind power bearings have been manufactured through the ring rolling technology. Yet, the inhomogeneous deformation of bearing ring in hot ring rolling remains unclear. In this work, the numerical model of hot ring forming for the high-speed rail bearing ring (HSRBR) is established, which is validated by the experimental method. Then, several parameters, such as the altitude h 0 , and h 0s are selected to study their effects on the homogeneous deformation of HSRBR. Further, the uniform deformation of HSRBR is improved according to the numerical results. These results provide valuable guidelines for the design and manufacture of ring rolling mills and HSRBR blanks.

关键词： High-speed rail bearing ring Ring rolling Deformation uniformity

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Feature Explanation for Robust Trajectory Prediction

Feature Explanation for Robust Trajectory Prediction

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Xukai Zhai Renze Hu Zhishuai Yin Department of Automotive Engineering Wuhan university of technology Wuhan Hubei China Foshan Xianhu laboratory of the Advanced Energy Science and Technology Guangdong laboratory Foshan Guangdong China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan Hubei China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan Hubei China Hubei Research Center for New Energy Wuhan Hubei China

Trajectory prediction of neighboring agents is a critical task for high-speed robotics such as autonomous vehicles. In order to obtain fine-grained and robust scene representations, existing works attempt to consider abundant information that is deemed relevant. The cost, however, is the heavy computational burden and more importantly the inevitable interference brought by redundant information. In this paper, we exploit the explainable AI (XAI) techniques and propose a model in the framework of “Encoder-Decoder” named parallel explainable Transformer (PXT) to identify the contributive features for robust trajectory prediction. A two-branch encoder is designed to disentangle the roadway information and agents' historical trajectories for better feature explanation. Two stages of feature explanation are incorporated into the encoder. In the first stage, an explainable Transformer (XT) comprising a Layer-wise Relevance Propagation (LRP)-based interpretation module is designed and implemented in both branches to score and filter the contextual and motion features. In the second stage of interpretation, the ProbSparse attention mechanism is innovatively adopted to measure the level of interactivity with sparsity, so that the relationships among highly interactive agents are focused on. The results on the Argoverse Benchmark show that our proposal achieves state-of-the-art (SOTA) performance without delicate and tedious network design, demonstrating the effectiveness of tracing and retaining contributive features in enhancing the performance of trajectory prediction.

关键词：

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Thermoelectric Generator Based Power System For Plug-In Hybrid Electric Vehicle

SSRN

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SSRN 2024年

作者： Liao, Bing Wang, Yiping Su, Chuqi Liu, Xun Zeng, Jinliang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Centre for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

Plug-in hybrid electric vehicles (PHEV) have become one of the mainstream directions for the development of the modern automotive industry, and the thermoelectric generator (TEG) that can recover energy from waste heat is becoming a priority choice for energy conservation and emission reduction. This paper proposes an effective energy management strategy (EMS) based on introducing a hybrid driving system, which is an assemblage of a TEG system and a PHEV model. The vehicle model with TEG has been established on AVL CRUISE based on MATLAB/Simulink. The accuracy of the vehicle model and the strategy has been verified through comparison with experiments, power performance testing, and vehicle speed following testing. The influence of the TEG on the distribution of the engine operating points was revealed through numerical simulation, demonstrating the effectiveness of applying the TEG system in PHEV and the accuracy of the strategy. The system reduces fuel consumption by 5.91%, and the improvement of strategy significantly supplements the battery power and EM, upgrading the stability of SOC by 26.85%. © 2024, The Authors. All rights reserved.

关键词： Waste heat

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