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Optimal design of automotive body B-pillar using simplified finite element model of body-in-prime combined with an optimization procedure

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Journal of Central South University 2022年第12期29卷 3939-3955页

作者： Mehri IZANLOO Abolfazl KHALKHALI Automotive Simulation and Optimal Design Research Laboratory School of Automotive EngineeringIran University of Science and TechnologyTehran 13114-16846Iran

Optimization of an automotive body structure faces the difficulty of having too many design variables and a too large design search space. A simplified model of body-in-prime(BIP) can solve this difficulty by reducing the number of design variables. In this study, to achieve lighter weight and higher stiffness, the simplified model of BIP was developed and combined with an optimization procedure;consequently, optimal designs of automotive body B-pillar were produced. B-pillar was divided into four quarters and each quarter was modelled by one simplified beam. In the optimization procedure, depth, width, and thickness of the simplified beams were considered as the design ***, bending and torsional stiffness were also considered as objective functions. The optimization procedure is composed of six stages: designing the experiments, calculating grey relational grade, calculating signal-to noise ratio,finding an optimum design using Taguchi grey relational analysis, performing sensitivity analysis using analysis of variance(ANOVA) and performing non-dominated sorting and multi-criteria decision making. The results show that the width of lower B-pillar has the highest effect(about 55%) and the obtained optimum design point could reduce the weight of B-pillar by about 40% without reducing the BIP stiffness by more than 1.47%.

关键词： body-in-prime(BIP)model finite element model bending stiffness torsional stiffness B-pillar Taguchi method multi criterion decision-making(MCDM)method

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Investigating the Influence of Graphene Coating Thickness on Al0.3cocrfeni High-Entropy Alloy Using Molecular Dynamics Simulation

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SSRN 2024年

作者： Zhao, Guanghui Liu, Zhimin Zhang, Peng Li, Juan Li, Huaying Ma, Lifeng Taiyuan University of Science and Technology Taiyuan030024 China Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan030024 China Shanxi Electronic Science and Technology Institute Linfen041000 China

The mechanism of the effect of graphene coating on Al0.3CoCrFeNi high-entropy alloy (HEA) substrate during the nanoindentation process was investigated through molecular dynamics (MD) simulation. Upon the addition of the graphene coating, the hardness of the HEA substrate significantly increased. This was because graphene augmented the force-bearing area of the material and mitigated stress concentration. Increasing the thickness of graphene coating reduced the degree of plastic deformation of the substrate, decreased the residual stresses within the material, and increased the shear modulus accordingly. Subsequent to the incorporation of a graphene coating, the total length of dislocation lines formed in the HEA matrix increased, and these dislocation lines intertwined to create dislocation cells, impeding the advancement of plastic deformation and effectively enhancing the material’s hardness. The motion of dislocations was closely associated with the formation and elimination of stacking faults. When the indentation force remained constant, the stacking faults that emerged in the HEA with only a single layer of graphene were more numerous compared to those in the HEA with three layers of graphene. Additionally, after several loading-unloading cycles, the contact area with the indenter failed first, with the failure mode involving the alteration of the FCC structure into an amorphous structure. © 2024, The Authors. All rights reserved.

关键词： Elastic moduli

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Flux Globalization Based Well-Balanced Path-Conservative Central-Upwind Scheme for the Thermal Rotating Shallow Water Equations

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Communications in Computational Physics 2023年第9期34卷 993-1042页

作者： Yangyang Cao Alexander Kurganov Yongle Liu Faculty of Computational Mathematics and Cybernetics Shenzhen MSU-BIT UniversityShenzhen518172China Department of Mathematics Shenzhen International Center for Mathematics and Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen518055China Institute of Mathematics University of ZurichWinterthurerstrasse 1908057 ZurichSwitzerland Department of Mathematics Southern University of Science and TechnologyShenzhen518055China

We present an extension of the flux globalization based well-balanced pathconservative central-upwind scheme to the one-and two-dimensional thermal rotating shallow water *** scheme is well-balanced in the sense that it can exactly preserve a variety of physically relevant steady *** the one-dimensional case,it can preserve different“lake-at-rest”equilibria,thermo-geostrophic equilibria,as well as general moving-water steady *** the two-dimensional case,preserving general moving-water steady states is difficult,and to the best of our knowledge,none of existing schemes can achieve this ultimate *** proposed scheme can exactly preserve the x-and y-directional jets in the rotational frame as well as certain genuinely two-dimensional ***,our approach employs a path-conservative technique for discretizing nonconservative product terms,which are incorporated into the global *** allows the developed scheme to exactly preserve some of the discontinuous steady states as *** provide a number of numerical examples to demonstrate the advantages of the proposed scheme over some alternative finitevolume methods.

关键词： Thermal rotating shallow water equations well-balanced schemes flux globalization path-conservative central-upwind schemes

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The corrosion behavior of AlO x coatings exposed to lead-bismuth eutectic at 350 °C–650 °C

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Journal of Materials Research and technology 2025年 36卷 9494-9503页

作者： Xiteng Li Yu Wang Ke Zhao Yongduo Sun Jun Han Xing Yin Jun Wu Yong Chen School of Advanced Materials Peking University Shenzhen Graduate School Peking University Shenzhen 518055 China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610041 China

The service life of heat-resistant materials is crucial for safe operation in the nuclear industry. Usually, it is necessary to coat the surface of the materials with a heat-resistant coating. In this paper, XPS, EDS, XRD, SEM, and TEM characterization techniques were used to study the corrosion behavior of continuous high-power magnetron sputtered (C-HPMS) AlO x coatings with different oxygen contents exposed to lead-bismuth eutectic (LBE) at 350 °C–650 °C for 2000 h was investigated. Stable oxide γ-Al 2 O 3 and Al 2 PbO 4 were formed at 350 °C–550 °C, which will increase the hardness and Young's modulus of the coating, and the dense layer Al 2 PbO 4 and AlO x layer inhibited the outward diffusion of iron and the inward diffusion of O. At 650 °C, the internal Fe will be oxidized to Fe 3 O 4 , resulting in corrosion resistance failure. Therefore, the AlO x coating at the oxygen injection rate of 120 sccm (O/Al = 1.5) is best, which can resist corrosion at T < 550 °C. Finally, the corrosion mechanism of the AlO x coating in liquid LBE is discussed, providing a research idea for developing high-performance anti-corrosion coatings.

关键词： Microstructural evolution Ceramic coatings Corrosion behavior Phase transformation

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Application of surrogate models to stability analysis and transition prediction in hypersonic flows

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Advances in Aerodynamics 2022年第1期4卷 699-720页

作者： Han Nie Wenping Song Zhonghua Han Guohua Tu Jianqiang Chen National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical UniversityXi’an710072People’s Republic of China China Aerodynamics Research and Development Center Mianyang621000People’s Republic of China

To increase the efficiency and robustness of stability-based transition prediction in flow simulations, simplified methods are introduced to substitute direct stability analyses for rapid disturbance growth prediction. For low-speed boundary layers, these methods are mainly established based on self-similar assumptions, which are not applicable to non-similar boundary layers in hypersonic flows. The objective of this article is to investigate the application of surrogate models to stability analysis of non-similar flows over blunt cones, focused on parameterization of boundary-layer (BL) profiles. Firstly, correlations between BL edge and profile parameters are analyzed, along with self-similar flow parameters and discrete points on BL profiles, which present four groups of BL characteristic parameters. Secondly, using these parameters as inputs, surrogate models are built for disturbance growth prediction over an MF-1 blunt cone. Results show that, surrogate models using four BL edge parameters and a BL shape factor {Ue, Te, ρe, ηe, H12} for stability analysis can achieve comparable accuracy with those using 16 discrete BL profile parameters, which are more precise than those using merely self-similar parameters or BL edge parameters. Thirdly, the established surrogate models are validated by stability analysis and transition prediction over the MF-1 blunt cone in flight experiments at the instants of t = 17 s ~ 22 s. Compared with direct linear stability analyses, the mean relative error of predicted disturbance growth rates by surrogate models is 8.0% and the maximum relative error of N factor envelopes is 6.6%, which indicates feasible applications of surrogate models to stability analysis and transition prediction of non-similar boundary layers in hypersonic flows.

关键词： Surrogate models Stability analysis Transition prediction Hypersonic flows Blunt cone

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Single-event-camera-based 3D trajectory measurement method for high-speed moving targets

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Chinese Optics Letters 2022年第6期20卷 14-18页

作者： Zeren Gao Yong Su Qingchuan Zhang Key Laboratory of Mechanical Behavior and Design of Materials of Chinese Academy of Sciences University of Science and Technology of ChinaHefei 230027China

High-speed target three-dimensional[3D]trajectory and velocity measurement methods have important uses in many fields,including explosive debris and rotating specimen trajectory *** conventional approach uses a binocular system with two high-speed cameras to capture the target’s 3D motion *** cost for the conventional approach is high,and accurately triggering several high-speed cameras is ***-based cameras have recently received considerable attention due to advantages in dynamic range,temporal resolution,and power *** address problems of camera synchronization difficulties,data redundancy,and motion blur in high-speed target 3D trajectory measurement,this Letter proposes a 3D trajectory measurement method based on a single-event camera and a four-mirror *** 3D trajectory and velocity of a particle flight process and a marker on a rotating disc were measured with the proposed method,and the results show that the proposed method can monitor the operational state of high-speed flying and rotating objects at a very low hardware cost.

关键词： event camera 3D trajectory experimental mechanics

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Resequencing 250 Soybean Accessions:New Insights into Genes Associated with Agronomic Traits and Genetic Networks

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Genomics, Proteomics & Bioinformatics 2022年第1期20卷 29-41页

作者： Chunming Yang Jun Yan Shuqin Jiang Xia Li Haowei Min Xiangfeng Wang Dongyun Hao Key Laboratory for Agricultural Biotechnology of Jilin Provincial Institute of Agricultural BiotechnologyJilin Academy of Agricultural Sciences(JAAS)Jilin 130033China Frontiers Science Center for Molecular Design Breeding College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100094China Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province College of Life Science and TechnologyHarbin Normal UniversityHarbin 150025China BioTrust Technology Inc. Beijing 100094China

The limited knowledge of genomic diversity and functional genes associated with the traits of soybean varieties has resulted in slow progress in *** this study,we sequenced the genomes of 250 soybean landraces and cultivars from China,America,and Europe,and investigated their population structure,genetic diversity and architecture,and the selective sweep regions of these *** novel agronomically important genes were identified,and the effects of functional mutations in respective genes were *** candidate genes GSTT1,GL3,and GSTL3 associated with the isoflavone content,CKX3 associated with yield traits,and CYP85 A2 associated with both architecture and yield traits were *** phenotype-gene network analysis revealed that hub nodes play a crucial role in complex phenotypic *** study describes novel agronomic trait-associated genes and a complex genetic network,providing a valuable resource for future soybean molecular breeding.

关键词： Agronomic trait GWAS Network Resequence Soybean

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The Instability Marsh Phenomenon and Marginal Stability Boundary Distortion of Density Wave Oscillation in Parallel Channels

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SSRN 2024年

作者： Sun, Ducheng Ma, Zaiyong Lu, Q. Liu, C.W. Pan, L.M. School of Energy and Power Engineering Shandong University No. 17923 Jingshi Road Jinan250061 China Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of Education Chongqing400044 China Department of Nuclear Engineering and Technology Chongqing University Chongqing400044 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China

Density wave oscillation (DWO) in parallel channels is an important problem that has been widely studied. The marginal stability boundary (MSB) is often found to be "L " shaped on the N pch -N sub plane, but some very different shapes were also reported. In this paper, the instability marsh region which could occur in the traditional instable region but having both instability and stability sections was presented and discussed, which is found to be an explanation of the distortion of MSB. The analysis of the instability marsh region showed that the evolution of instability marsh should be due to the stability change when operation condition changes, which can be estimated with the analysis of the two-phase and single phase pressure drop variation, as well as Ma’s stability criterion for different heat flux profiles. Variation of instability marsh with different heat flux profile, inlet and outlet resistance coefficient, mass flow and pressure were obtained and analyzed, and the effects of these parameters on instability marsh variation were found to be well interpreted with stability change. The calculation and analysis of instability marsh showed a clear evolution figure of the distortion of MSB under different conditions, and related research could be helpful in better understanding the flow instability in parallel channels. © 2024, The Authors. All rights reserved.

关键词： Stability criteria

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Generative AI in Virtual Reality Communities: A Preliminary Analysis of the VRChat Discord Community

Generative AI in Virtual Reality Communities: A Preliminary ...

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2025 CHI Conference on Human Factors in Computing Systems, CHI EA 2025

作者： Zhang, He Zha, Siyu Cai, Jie Wohn, Donghee Yvette Carroll, John M. College of Information Sciences and Technology Pennsylvania State University University ParkPA United States Academy of Art & Design Tsinghua University Beijing China The Future Laboratory Tsinghua University Beijing China Department of Computer Science and Technology Tsinghua University Beijing China New Jersey Institute of Technology NewarkNJ United States

ISBN: (纸本)9798400713958

As immersive social platforms like VRChat increasingly adopt generative AI (GenAI) technologies, it becomes critical to understand how community members perceive, negotiate, and utilize these tools. In this preliminary study, we conducted a qualitative analysis of VRChat-related Discord discussions, employing a deductive coding framework to identify key themes related to AI-assisted content creation, intellectual property disputes, and evolving community norms. Our findings offer preliminary insights into the complex interplay between the community’s enthusiasm for AI-driven creativity and deep-rooted ethical and legal concerns. Users weigh issues of fair use, data ethics, intellectual property, and the role of community governance in establishing trust. By highlighting the tensions and trade-offs as users embrace new creative opportunities while seeking transparency, fair attribution, and equitable policies, this research offers valuable insights for designers, platform administrators, and policymakers aiming to foster responsible, inclusive, and ethically sound AI integration in future immersive virtual environments. © 2025 Copyright held by the owner/author(s).

关键词： Ethical technology

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A Global Visual Information Intervention Model for Medical Visual Question Answering

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Computers in Biology and Medicine 2025年第PT A期192卷 110195-110195页

作者： Peng, Peixi Fan, Wanshu Shen, Yue Yang, Xin Zhou, Dongsheng National and Local Joint Engineering Laboratory of Computer-Aided Design School of Software Engineering Dalian University Dalian116622 China School of Computer Science and Technology Dalian University of Technology Dalian116024 China

Medical Visual Question Answering (Med-VQA) aims to furnish precise responses to clinical queries related to medical imagery. While its transformative potential in healthcare is undeniable, current solutions remain nascent and are yet to see widespread clinical adoption. Med-VQA presents heightened complexities compared to standard visual question answering (VQA) tasks due to the myriad of clinical scenarios and the scarcity of labeled medical imagery. This often culminates in language biases and overfitting vulnerabilities. In light of these challenges, this study introduces Global Visual Information Intervention (GVII), an innovative Med-VQA model designed to mitigate language biases and improve model generalizability. GVII is centered on two key branches: the Global Visual Information Branch (GVIB), which extracts and filters holistic visual data to amplify the image's contribution and reduce question dominance, and the Forward Compensation Branch (FCB), which refines multimodal features to counterbalance disruptions introduced by GVIB. These branches work in tandem to enhance predictive accuracy and robustness. Furthermore, a multi-branch fusion mechanism ensures cohesive integration of features and losses across the model. Experimental results demonstrate that the proposed model outperforms existing state-of-the-art models, achieving a 2.6% improvement in accuracy on the PathVQA dataset. In conclusion, the GVII-based Med-VQA model not only successfully mitigates prevalent language biases and overfitting issues but also significantly improves diagnostic precision, offering a considerable stride toward robust, clinically applicable VQA systems. © 2025

关键词： Question answering

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