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Methods for Calculating Intervals of Reconstructed Results in Traffic Accidents with Different Types of Interval Traces

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Journal of Shanghai Jiaotong university(Science) 2017年第5期22卷 555-561页

作者：邹铁方李华李岳林蔡铭肖璟 School of Automobile and Mechanical Engineering Changsha University of Science and Technology Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology School of Engineering Sun Yat-sen University

In order to obtain more effective uncertainty analysis methods for analyzing uncertainty of a reconstructed result in a traffic accident with different types of interval traces, three new methods are proposed. The first method is named as sub-interval perturbed method, it is used for calculating the binary interval of the reconstructed result in an accident with binary interval traces, and it can overcome the interval extension problem well. The second method is based on interval arithmetic and the first method, it is used for calculating the ternary interval of the accident reconstruction result in an accident with ternary interval traces, and the most probable value of the reconstructed result is a number. The basic idea of the third method is the same as that of the second method, it is used for calculating the ternary interval of the accident reconstruction result in an accident with mixed interval traces, and the most probable value of the reconstructed result is an interval. All methods are demonstrated and validated by numerical cases. The results show that all methods are feasible and practical. Finally, a true vehicle-motorcycle accident is given, in which the braking distance of vehicle, and the throw distances of driver and motorcycle are all binary interval traces. The accident is reconstructed by the software PC-Crash, and the interval of impact velocity is analyzed. The interval of the velocity is [55.7, 64.3] km/h. This interval result is more objective than a single number. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany.

关键词： Bins Highway accidents Motorcycles Numerical methods Uncertainty analysis

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Near-field acoustic levitation and applications to bearings:a critical review

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International Journal of Extreme Manufacturing 2019年第3期1卷 13-32页

作者： Minghui Shi Kai Feng Junhui Hu Jiang Zhu Hailong Cui State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082People’s Republic of China State Key Lab of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China Department of Mechanical Engineering Tokyo Institute of TechnologyJapan Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang621000People’s Republic of China

The importance to industry of non-contact bearings is growing rapidly as the demand for highspeed and high-precision manufacturing equipment *** a recently developed non-contact technology,near-field acoustic levitation(NFAL)has drawn much attention for the advantages it offers,including no requirement for an external pressurized air supply,its compact structure,and its ability to adapt to its *** this paper,the working mechanism of NFAL is introduced in detail and compared to all existing non-contact technologies to demonstrate its versatility and potential for practical applications in *** fundamental theory of NFAL,including gas film lubrication theory and acoustic radiation pressure theory is ***,the current stateof-the-art of the design and development of squeeze film air bearings based on NFAL is ***,future trends and obstacles to more widespread use are discussed.

关键词： acoustic levitation non-contact technology bearing measuring and manufacturing equipment squeeze film

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Improved Differential Evolution with Shrinking Space Technique for Constrained Optimization

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Chinese Journal of Mechanical engineering 2017年第3期30卷 553-565页

作者： Chunming FU Yadong XU Chao JIANG Xu HAN Zhiliang HUANG State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University School of Mechanical Engineering Nanjing University of Science and Technology

Most of the current evolutionary algorithms for constrained optimization algorithm are low computational efficiency. In order to improve efficiency, an improved differential evolution with shrinking space technique and adaptive trade-off model, named ATMDE, is proposed to solve constrained optimization problems. The proposed ATMDE algorithm employs an improved differential evolution as the search optimizer to generate new offspring individuals into evolutionary population. For the con- straints, the adaptive trade-off model as one of the most important constraint-handling techniques is employed to select better individuals to retain into the next population, which could effectively handle multiple constraints. Then the shrinking space technique is designed to shrink the search region according to feedback information in order to improve computational efficiency without losing accuracy. The improved DE algorithm introduces three different mutant strategies to generate different offspring into evo- lutionary population. Moreover, a new mutant strategy called ＂DE/rand/best/l＂ is constructed to generate new individuals according to the feasibility proportion ofcurrent population. Finally, the effectiveness of the pro- posed method is verified by a suite of benchmark functions and practical engineering problems. This research presents a constrained evolutionary algorithm with high efficiency and accuracy for constrained optimization problems.

关键词： Constrained optimization - Differentialevolution Adaptive trade-off model Shrinking spacetechnique

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Achieving large-scale or high-resolution topology optimization based on Modified BESO and XEFM

arXiv

引用

arXiv 2019年

作者： Wang, Hongxin Liu, Jie Wen, Guilin Center for Research on Leading Technology of Special Equipment School of Mechanical and Electric Engineering Guangzhou University Guangzhou510006 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China

To solve large-scale or high-resolution topology optimization problem, a novel algorithm is developed based on modified bi-directional evolutionary structure optimization (BESO) and extended finite element method (XFEM). Within XFEM, a set of enriched nodes are defined to divide the finite element into several uniform sub-regions, i.e. sub-triangles and sub-tetrahedrons. The material grid and shape functions are defined on each sub-region to improve the computational accuracy, whereas the equilibrium equation is established on the level of coarse finite elements to increase the computational efficiency. We set all the standard FE nodes and the enriched nodes as the design variables, and a modified material interpolation model is introduced to calculate the material properties for sub-regions. An enrichment function originating from modeling voids scheme is adopted to character the discontinuity between solid material to void material. To efficiently use the gradient-based algorithm, BESO, sensitivity analysis is performed with the aid of adjoint method. Typical numerical examples, involving millions of design variables, are carried to verify the effectiveness of the proposed method. Copyright © 2019, The Authors. All rights reserved.

关键词： Sensitivity analysis

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An efficient and high-resolution topology optimization method based on convolutional neural networks

arXiv

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arXiv 2019年

作者： Xue, Liang Liu, Jie Wen, Guilin Wang, Hongxin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Center for Research on Leading Technology of Special Equipment School of Mechanical and Electric Engineering Guangzhou University Guanghzou510006 China

Topology optimization is a pioneering design method that can provide various candidates with high mechanical properties. However, the high-resolution for the optimum structures is highly desired, normally in turn leading to computationally intractable puzzle, especially for the famous Solid Isotropic Material with Penalization (SIMP) method. In this paper, we introduce the Super-Resolution Convolutional Neural Network (SRCNN) technique into topology optimization framework to improve the resolution of topology solutions with extremely high computational efficiency. Additionally, a pooling strategy is established to balance the number of finite element analysis (FEA) and the output mesh in optimization process. Considering the high training cost of 3D neural networks, several 2D neural networks are combined to deal with 3D topology optimization design problems. The combined treatment method used in 3D topology optimization design eliminates the expense of retraining 3D convolutional neural network and guarantees the quality of 3D design. Some typical examples justify that the high-resolution topology optimization method adopting SRCNN has excellent applicability and high *** Codes 65k10(Primary), 68T05(Secondary) Copyright © 2019, The Authors. All rights reserved.

关键词： Shape optimization

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Stepwise-Nanocavity-Assisted Transmissive Color Filter Array Microprints

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Research 2018年第1期2018卷 34-43页

作者： Yasi Wang Mengjie Zheng Qifeng Ruan Yanming Zhou Yiqin Chen Peng Dai Zhengmei Yang Zihao Lin Yuxiang Long Ying Li Na Liu Cheng-Wei Qiu Joel K.W.Yang Huigao Duan State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China School of Physics and Electronics Hunan UniversityChangsha 410082China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Engineering Product Development Pillar Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore Kirchhof Institute for Physics University of HeidelbergIm Neuenheimer Feld 22769120 HeidelbergGermany

Visible-light color flters using patterned nanostructures have attracted much interest due to their various advantages such as compactness,enhanced stability,and environmental friendliness compared with traditional pigment or dye-based optical *** most existing studies are based on planar nanostructures with lateral variation in size,shape,and arrangement,the vertical dimension of structures is a long-ignored degree of freedom for the structural ***,we demonstrate a synthetic platform for transmissive color flter array by coordinated manipulations between height-varying nanocavities and their lateral flling *** thickness variation of those nanocavities has been fully deployed as an alternative degree of freedom,yielding vivid colors with wide gamut and excellent *** results show that the color-rendering capability of the pixelated nanocavities can be still retained as pixels are miniaturized to 500 *** between closely spaced pixels of a Bayer color flter arrangement was calculated,showing minimal crosstalk for 1μm2 square *** work provides an approach to designing and fabricating ultracompact color flter arrays for various potential applications including stained-glass microprints,microspectrometers,and high-resolution image sensing systems.

关键词： arrangement rendering cavity

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Fault-tolerant cooperative control for multiple UAVs based on sliding mode techniques

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Science China(Information Sciences) 2017年第7期60卷 54-66页

作者： Peng LI Xiang YU Xiaoyan PENG Zhiqiang ZHENG Youmin ZHANG College of Mechatronics Engineering and Automation National University of Defense Technology Department of Mechanical and Industrial Engineering Concordia University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

This paper proposes a fault-tolerant cooperative control(FTCC) design approach for multiple unmanned aerial vehicles(UAVs), where the outer-loop control and the inner-loop fault accommodation are explicitly considered. The reference signals for the inner-loop of the follower UAV can be directly produced by resorting to a proportional control. In the presence of actuator faults, the estimation of the fault information can be completed within finite time. Moreover, the control of the inner-loop is reconfigured based on the fault information adaptation and sliding mode techniques, such that the deleterious effects due to failed actuators can be compensated within finite time. Simulations of UAV cooperative flight are conducted to illustrate the effectiveness of this FTCC scheme.

关键词： fault-tolerant cooperative control unmanned aerial vehicle actuator faults finite-time fault ac commodation

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Corrigendum to “Assessment of electric vehicle charging scenarios in China under different-temperature conditions” [Journal of Energy Storage 41 (2021) 102859]

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Journal of Energy Storage 2021年 42卷

作者： Peifeng Huang Shoutong Liu Yaming Zhang Yang Ou Ganghui Zeng Jinjin Zhou Zhonghao Bai State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China. Department of New Energy Power Evaluation and Research China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 PR China Department of New Energy technology research China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 PR China

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An improved time integration scheme based on uniform cubic B-splines and its application in structural dynamics

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Applied Mathematics and Mechanics(English Edition) 2017年第6期38卷 889-908页

作者： Weibin WEN Hongshuai LEI Kai WEI Baosheng XU Shengyu DUAN Daining FANG College of Engineering Peking UniversityBeijing 100871China Beijing Institute of Technology Beijing 100081China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body School of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Key Laboratory of Applied Mechanics Department of Engineering MechanicsSchool of Aerospace EngineeringTsinghua UniversityBeijing 100084China

A time integration algorithm for structural dynamic analysis is proposed by uniform cubic B-spline functions. The proposed algorithm is successfully used to solve the dynamic response of a single degree of freedom （SDOF） system, and then is generalized for a multiple-degree of freedom （MDOF） system. Stability analysis shows that, with an adjustable algorithmic parameter, the proposed method can achieve both conditional and unconditional stabilities. Validity of the method is shown with four numerical simulations. Comparison between the proposed method and other methods shows that the proposed method possesses high computation accuracy and desirable computation efficiency.

关键词： dynamical system time integration~ stability dynamic response B-spline

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The Effects of Using Taxi-Hailing Application on Driving Performance

arXiv

引用

arXiv 2018年

作者： Feng, Xiexing Cao, Libo Zhang, Yunxian Gao, Hongbo Tan, Lifan State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University ChangshaHunan China Department of Electrical and Computer Engineering University of Windsor WindsorONN9B 3P4 Canada State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha Hunan China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China

—Driver distraction has become a major threat to the road safety, and the globally booming taxi-hailing application introduces new source of distraction to drivers. Although various in-vehicle information systems (IVIS) have been studied extensively, no documentation exists objectively measuring the extent to which interacting with taxi-hailing application during driving impacts drivers’ behavior. To fill this gap, a simulator-based study was conducted to synthetically compare the effects that different output modalities (visual, audio, combined visual-audio) and input modalities (baseline, manual, speech) imposed on the driving performance. The results show that the visual output introduced more negative effects on driving performance compared to audio output. In the combined output, visual component dominated the effects imposed on the longitudinal control and hazard detection;audio component only exacerbated the negative effects of visual component on the lateral control. Speech input modality was overall less detrimental to driving performance than manual input modality, especially reflected in the drivers’ quicker reaction to hazard events. The visual-manual interaction modality most severely impaired the hazard detecting ability, while also led to strong compensative behaviors. The audio-speech and visual-speech modality associated with more smooth lateral control and faster response to hazard events respectively compared to other modality. These results could be applied to improve the design of not only the taxi-hailing application, but also other input-output balanced IVIS. Copyright © 2018, The Authors. All rights reserved.

关键词： Automobile drivers

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