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SSRN 2023年

作者： Yan, Dapeng Ding, Gangyi Huang, Kexiang Huang, Tianyu Key Laboratory of Digital Performance and Simulation Technology Beijing Institute of Technology Beijing100081 China

Traditional methods for constructing crowd simulations often have shortcomings in terms of realism, and data-driven methods are an effective approach to enhancing the visual realism of crowd simulation. However, existing work mainly constructs crowd simulations through prediction-based approaches based on deep learning or by fitting the parameters of traditional methods, which limits the expressiveness of the model. In response to these limitations, this paper introduces a method capable of generating realistic pedestrian crowds. This approach uses a Generative Adversarial Network, complemented by a Transformer module, to learn behavioral patterns from actual crowd trajectories. We use a transformer module to extract trajectory features of the crowd, then convert the spatial relationships between individuals into sequences using a special data processing mechanism, and use the transformer module to extract social features of the crowd, while guiding the movement of each individual with their target direction. During training, we simultaneously learn from real crowd data and simulation data resolving collisions by traditional methods, to enhance the collision avoidance behavior of virtual crowds while maintaining the movement patterns of real crowds, resulting in more general collision avoidance behavior. The crowds generated by the model are not limited to specific scenarios and show generalization capabilities. Compared to other models, our method shows better performance on publicly available large-scale pedestrian datasets after training. © 2023, The Authors. All rights reserved.

关键词： Collision avoidance

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Gravity compensation method via magnetic quasi-zero stiffness combined with a quasi-zero deformation control strategy

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Science China(Technological Sciences) 2022年第8期65卷 1738-1748页

作者： ZHOU Rui ZHOU YiFan CHEN XueDong HOU WeiJie WANG Chang WANG Hao JIANG Wei State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Tianjin Key Laboratory of Microgravity and Hypogravity Environment Simulation Technology Tianjin Institute of Aerospace Mechanical and Electrical EquipmentTianjin 300301China Institute of Artificial Intelligence Huazhong University of Science and TechnologyWuhan 430074China

Gravity compensation refers to the creation of a constant supporting force to fully or partly counteract the gravitational force for ground verification to simulate the spacecraft dynamics in outer space with zero-or micro-gravity. Gravity compensation is usually implemented via a very low stiffness suspension/supporting unit, and a servo system in series is adopted to extend the simulation range to hundreds of millimeters. The error of suspension force can be up to tens of Newton due to the contact/friction in the suspension/supporting unit and the error of the force/pressure sensor. It has become a bottleneck for the ground verification of spacecraft guidance, navigation, and control systems with extreme requirements, such as tons of payload and fine thrust in sub-Newtons. In this article, a novel gravity compensation method characterized by quasi-zero stiffness plus quasi-zero deformation(QZS-QZD) is proposed. A magnetic negative stiffness spring in parallel with positive springs and aerostatic bearing is adopted to form a QZS supporting unit, and disturbance forces, such as contact or friction, can be eliminated. The deformation of the QZS supporting unit is measured via a displacement sensor, and the QZD control strategy is applied to guarantee the force error of gravity compensation to be less than sub-newtons and irrelevant to the payload. The principle of gravity compensation with QZS-QZD is analyzed, and performance tests on a prototype are carried out. The results show that when the spacecraft moves smoothly, the absolute force error is less than 0.5 N, the relative error of gravity compensation is less than 0.1%, and when collisions with other objects occur, the relative errors are 0.32% and 0.65%. The proposed method can significantly improve the gravity compensation accuracy in comparison with conventional approaches.

关键词： gravity compensation zero-gravity ground verification quasi-zero stiffness quasi-zero deformation

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Introducing Anisotropic Fields for Enhanced Diversity in Crowd simulation

arXiv

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arXiv 2024年

作者： Li, Yihao Liu, Junyu Guan, Xiaoyu Hou, Hanming Huang, Tianyu Key Laboratory of Digital Performance and Simulation Technology Beijing Institute of Technology Zhong Guan Cun South Street Beijing100081 China

Large crowds exhibit intricate behaviors and significant emergent properties, yet existing crowd simulation systems often lack behavioral diversity, resulting in homogeneous simulation outcomes. To address this limitation, we propose incorporating anisotropic fields (AFs) as a fundamental structure for depicting the uncertainty in crowd movement. By leveraging AFs, our method can rapidly generate crowd simulations with intricate behavioral patterns that better reflect the inherent complexity of real crowds. The AFs are generated either through intuitive sketching or extracted from real crowd videos, enabling flexible and efficient crowd simulation systems. We demonstrate the effectiveness of our approach through several representative scenarios, showcasing a significant improvement in behavioral diversity compared to classical methods. Our findings indicate that by incorporating AFs, crowd simulation systems can achieve a much higher similarity to real-world crowd systems. Our code is publicly available at https://***/tomblack2014/AF Generation. Copyright © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Potential Distribution of Seagrass Meadows Based on the MaxEnt Model in Chinese Coastal Waters

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Journal of Ocean University of China 2022年第5期21卷 1351-1361页

作者： WANG Ming WANG Yong LIU Guangliang CHEN Yuhu YU Naijing Center for High Performance Computing and System Simulation Pilot National Laboratory for Marine Science and TechnologyQingdao 266200China Shandong Provincial Key Laboratory of Computer Networks Qilu University of Technology(Shandong Academy of Sciences)Jinan 250101China

Seagrass meadows are generally diverse in China and have become important ecosystem with essential ***,the seagrass distribution across the seawaters of China has not been evaluated,and the magnitude and direction of changes in seagrass meadows remain *** study aimed to provide a nationwide seagrass distribution map and explore the dynamic changes in seagrass population under global climate *** studies were performed using the modeling software MaxEnt with 58961 occurrence records and 27 marine environmental variables to predict the potential distribution of seagrasses and calculate the *** environmental variables were excluded from the modeling processes based on a correlation analysis to ensure predicted *** predicted area was 790.09 km^(2),which is much larger than the known seagrass distribution in China(87.65 km^(2)).By 2100,the suitable habitat of seagrass will shift northwest and increase to 923.62 *** of the sum of the individual family under-pre-dicted the national distribution of seagrasses and consistently showed a downward trend in the *** of all environmental vari-ables,physical parameters(e.g.,depth,land distance,and sea surface temperature)contributed the most in predicting seagrass distri-butions,and nutrients(e.g.,nitrate,phosphate)ranked among the key influential predictors for habitat suitability in our study *** study is the first effort to fill a gap in understanding the distribution of seagrasses in *** studies using modeling and biological/ecological approaches are warranted.

关键词： seagrass meadows species distribution modeling global climate change Chinese coastal waters

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Sandwich-type composited solid polymer electrolytes to strengthen the interfacial ionic transportation and bulk conductivity for all-solid-state lithium batteries from room temperature to 120℃

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Journal of Energy Chemistry 2024年第8期95卷 288-295,I0007页

作者： Jiewen Tan Zhen Wang Jiawu Cui Zhanhui Jia Wensheng Tian Chao Wu Chengxin Peng Chengyong Shu Kang Yang Wei Tang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049ShaanxiChina State Key Laboratory of Space Power-sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Top-Energy Digital Manufacturing Technologies(Xi'an)Co. Ltd.Xi'an 710100ShaanxiChina

The insurmountable charge transfer impedance at the Li metal/solid polymer electrolytes(SPEs)interface at room temperature as well as the ascending risk of short circuits at the operating temperature higher than the melting point,dominantly limits their applications in solid-state batteries(SSBs).Although the inorganic filler such as CeO_(2)nanoparticle content of composite solid polymer electrolytes(CSPEs)can significantly reduce the enormous charge transfer impedance at the Li metal/SPEs interface,we found that the required content of CeO_(2)nanoparticles in SPEs varies for achieving a decent interfacial charge transfer impedance and the bulk ionic conductivity in *** this regard,a sandwich-type composited solid polymer electrolyte with a 10%CeO_(2)CSPEs interlayer sandwiched between two 50%CeO_(2)CSPEs thin layers(sandwiched CSPEs)is constructed to simultaneously achieve low charge transfer impedance and superior ionic conductivity at 30℃.The sandwiched CSPEs allow for stable cycling of Li plating and stripping for 1000 h with 129 mV polarized voltage at 0.1 mA cm^(-2)and 30℃.In addition,the LiFePO_(4)/Sandwiched CSPEs/Li cell also exhibits exceptional cycle performance at 30℃and even elevated120℃without short *** multi-layered CSPEs with optimized contents of the inorganic fillers can be an efficient method for developing all solid-state PEO-based batteries with high performance at a wide range of temperatures.

关键词： PEO-based solid electrolytes CeO_(2)nanoparticles Charge transfer impedance Sandwich-type composite electrolytes All-solid-state Li metal batteries

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Designing hard wear-resistant conductors by introducing high-plasma-energy heterogeneous metals into transition metal nitrides

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Journal of Materials Science & technology 2023年第26期157卷 213-219页

作者： Yuankai Li Chaoquan Hu Yao Wu Zhenan Qiao Yifan Cheng Zhiqing Gu Gang Gao Weitao Zheng State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China SINOPEC Star Co.Ltd. Beijing 100083China Key Laboratory of Medical Electronics and Digital Health of Zhejiang Province College of Information Science and EngineeringJiaxing UniversityJiaxing 314001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

*** Hard and wear-resistant conductors(HWCs)refer to functional films with simultaneously high hardness,high wear resistance,and good electrical *** have important applica-tions such as next-generation sliding electrical contacts,high-end conductive probe-tip,and oval hole guides for the precision rolling mill[1-4],which has drawn extensive research ***,it is still challenging to integrate high hardness,super wear resis-tance,and high electrical conductivity in one ***-ally,researchers have mainly alloyed the highly conductive met-als Cu,Au,and Pt to improve their hardness and wear resistance.

关键词： wear high electrical

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Modeling of Drama performance Intelligent Evaluation Driven by Multimodal Data 15th

Modeling of Drama Performance Intelligent Evaluation Driven...

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15th International Conference on Genetic and Evolutionary Computing, ICGEC 2023

作者： Song, Zhen Wu, Yufeng Zhang, Longfei Tao, Wenting Li, Lijie Ding, Gangyi Advanced Research Center for Digitalization of Traditional Drama The Central Academy of Drama 39 Dongmian Hutong Dongcheng District Beijing China Key Laboratory of Digital Performance and Simulation Technology Beijing Institute of Technology 5 Zhongguancun South Street Haidian District Beijing China Military Dance Performance Teaching and Research Office School of Military Culture National Defense University of the People’s Liberation Army of China 18 Zhongguancun South Street Haidian District Beijing China

ISBN: (纸本)9789819700677

The purpose of this study is to explore a data-driven intelligent evaluation method for drama performances, and to improve the evaluation quality of drama performances. Our research work is mainly to establish the temporal relationship between motion and musical features in dramatic performances and to construct a multimodal evaluation dataset (PEMD, performance Evaluation Multimodal Dataset) for drama performances based on computer vision methods and deep learning technologies. Then the evaluation of drama performance is achieved by detecting and evaluating the match degree (DMD, Dramatic Match Degree) of the motion and musical features in the drama performance. The main works includes: (1) A data-driven intelligent evaluation framework for drama performance is proposed, which defines and describes the collection method, classification and feature extraction of drama performance evaluation data;(2) A sliding window computing unit based on Dramatic Stylization Annotation is proposed. As the core computing module of the drama performance evaluation architecture, it establishes the corresponding relationship between performance motion and music based on temporal features, and constructs Multimodal Evaluation Dataset (PEMD) for the drama performance;(3) Aiming at the temporal features of drama performances, a co-training method is proposed to establish the Theater performance Evaluation Model (TPEM) and realize intelligent computing methods for drama performance intelligent evaluation. The experimental results show that the average accuracy rate (MAP Mean Average Precision) of the drama performance evaluation model proposed in this paper reaches 62.41%, showing excellent evaluation ability. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Feature extraction

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Analysis and Optimization of Flow-Guided Structure Based on Fluid-Structure Interaction

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1573-1584页

作者： Yue Cui Liyuan Wang Jixing Ru Jian Wu Key Laboratory of Intelligent Equipment Digital Design and Process Simulation Hebei ProvinceTangshan UniversityTangshan063000China Department of Intelligent Manufacturing Tangshan Vocational College of Science and TechnologyTangshan063001China Beijing Materials Handling Research Instituted Co. Ltd.Beijing100010China

Gases containing sulfur oxides can cause corrosion and failure of bellows used as furnace blowers in high-temperature *** order to mitigate this issue,the behavior of an effective blast furnace blower has been examined in ***,the Sereda corrosion model has been introduced to simulate the corrosion rate of the related bellows taking into account the effects of temperature and SO_(2) gas;such results have been compared with effective measurements;then,the average gas velocity in the pipeline and the von Mises stress distribution of the inner draft tube have been analyzed using a Fluid-Structure Interaction ***,the semi-closed internal corrosion environment caused by a 5 mm radial gap between the inner draft tube and the bellows has been *** gas flow rate in the residential space has been found to be low(0.5 ms–this value leads to a stable semi-closed internal corrosion environment for exhaust gas exchange);water phase in the exhaust gas is prone to accelerate the corrosion *** this basis,a bellows with an optimized inner draft tube has proposed,which includes corrosion-resistant honeycomb buffer rings.

关键词： Bellows optimized inner draft tube FSI(Fluid-structure interaction) corrosion rate

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General theory for designing phonon transport in alloyed/doped materials

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 133-140页

作者： Chenhan Liu Chao Wu Wei Liu Yunshan Zhao Gang Zhang Hongmin Yang Yunfei Chen Micro-and Nano-scale Thermal Measurement and Thermal Management Laboratory Key Laboratory of Numerical Simulation for Large Complex SystemsMinistry of EducationSchool of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing210023China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing210023China Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceInstitute of Physics Frontiers and Interdisciplinary SciencesSchool of Physics and TechnologyNanjing Normal UniversityNanjing210023China Agency for Science Technology and ResearchInstitute of High-Performance ComputingSingapore138632Singapore Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211100China

Alloying/doping is a widely used technique for improving the electrical,mechanical,and optical properties of ***,this technology induces significant distortions in the lattice structure,mass distribution,and potential field,greatly enhancing phonon ***,we introduce the concept of alloying/doping path and employ crystal symmetry,lattice deformation,and electron distribution to characterize *** on this new concept,the phonon thermal transport behavior in alloyed/doped materials can be well designed,and along different alloying/doping paths,the difference in thermal conductivity can be up to 45 *** one hand,strategic alloying/doping that combines high crystal symmetry,large lattice contraction,and the same electron distribution suppresses phonon-phonon scattering phase space,induces phonon stiffening,and bolsters electronic structure symmetry,*** synergistic effects significantly improve thermal *** the other hand,random alloying/doping has a low symmetry,leading to the typical“U”shape of alloying/doping level-dependent thermal *** theory is corroborated in three-dimensional(3D)Si,2D MoS_(2),and quasi-1D TiS_(3),affirming its efficacy and broad applicability in controlling phonon transport.

关键词： phonon transport alloyed/doped materials crystal symmetry lattice contraction electronic structure

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Modeling and Fault Diagnosis of Pressurizer Based on Bond Graph 29

Modeling and Fault Diagnosis of Pressurizer Based on Bond Gr...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Zhou, Zhuoran Peng, Minjun Wang, Hang Jiang, Yingying Key Subject Laboratory of Nuclear Safety and Simulation Technology Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Harbin150001 China Key Laboratory of Nuclear Power Plant Performance and Equipment Harbin150001 China

ISBN: (纸本)9780791886502

The bond graph can be used to simulate and model conservation processes in different energy domains. In this paper, based on bond graph, the pressurizer was modeled and diagnosed at full power. Two parameters of pressure and mass flow were selected. Firstly, the bond graph of pressurizer was established. The pressurizer was divided into three zones: the fluctuating zone, the saturated liquid zone and the gaseous zone. The conservation equations of mass and energy were given respectively for these three regions. Secondly, the conservation equations of mass and energy were combined with the conservation of volume, and the model was constructed according to the combination rules. Then, according to the established bond graph model, the time causality diagram was established to determine the influence relationship between the coefficients and listed the fault characteristic matrix. Meanwhile, the reasoning structure between the coefficient was realized by the expert system G2. Finally, the fault data simulated by simulator was imported into the bond graph model. The failure of the safety valve, the spray valve and the immersion type heater were introduced to verify the modeling and diagnosis effect. It concludes that the diagnosis effect is consistent with the imported fault. Compared with the data-driven method, the bond graph method is more reliable, and compared with the expert knowledge method, the bond graph method can diagnose unknown faults and has a wide range of applications. In addition, a new method for nuclear power plant simulation modeling was provided. This was a new attempt to model bond graphs outside the research of mechanic, electronic and hydraulic. © 2022 by ASME.

关键词： Failure analysis

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