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2021 5th International Conference on Management Engineering, Software Engineering and Service sciences, ICMSS 2021

作者： Zhang, Mengmeng Yi, Shuanghui Lin, Menglong Chen, Honghui Science and Technology on Information Systems Engineering Laboratory China National Key Laboratory for Complex System Simulation China

ISBN: (纸本)9781450389709

Currently, with the deepening of development and open of China's border, issues of border joint defense become increasingly arduous. Traditional means of cooperation and coordination are far from being able to align requirements;information systems of different joint defense units are difficult to interconnect and interoperate;the previous results of joint defense informatization are difficult to inherit. The main reason is the lack of border joint defense information construction with a top-level design approach. Via the lens of top-level design, this paper establishes a multi-viewpoint architecture framework and transformation process, develops the as-is and to-be joint defense architecture, and finally analyzes transformation principles from the as-is architecture to to-be architecture. This paper mainly explores the architecture transformation mechanisms under the border joint defense scenario. © 2021 ACM.

关键词： Architecture

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Dynamic Performance Analysis of Track Rubber Bushing Considering Thermal Stress Coupling 2nd

Dynamic Performance Analysis of Track Rubber Bushing Conside...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhou, Lei Wang, Pingxin Yu, Hailong Huang, Kai Institute of Launch Dynamics Nanjing University of Science and Technology No. 200 Xiaolingwei Street Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Tracks with rubber bushings are widely used in modern high-speed tracked vehicles, which greatly reduce the vibration and noise of tracks. Because of the viscoelastic characteristics of rubber material, the strain of track pin bushing lags behind the stress during torsion, tension and compression, which leads to heat loss. Unfortunately, rubber has a low thermal conductivity, leading to a continuous increase in internal temperature within the structural parts. This rise in temperature can adversely affect the mechanical characteristics of the bushing. In this paper, theoretical modeling and experimental analysis are carried out to investigate the tension–compression and torsion behavior of the rubber bushing in track pins. Then, the stress–strain correction models of the bushing under different initial temperatures are obtained. Finite element analysis is used to simulate the coupled thermal stress, and the influence of temperature rise of the bushing caused by elastic hysteresis on tensile-compressive and torsional stiffness is obtained. This result can be used to track dynamics simulation and analysis of the connection between track shoes. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Rubber

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An Efficient Three-Node Beam Element for Large Deformation Analysis Using Absolute Nodal Coordinate Formulation 2nd

An Efficient Three-Node Beam Element for Large Deformation A...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhou, Huaqing He, Bin Ren, Hui Cui, Jiang Hao, Feiyu Feng, Yu Rui, Xiaoting Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China School of Astronautics Harbin Institute of Technology Harbin China

ISBN: (纸本)9789819980475

An efficient formulation for dynamics of beams with large deformation and large rotation is presented. A large deformation three-node beam element is established, in which the position coordinate is selected as the generalized coordinates in middle node, and the position coordinate and lateral slope vectors are selected as the generalized coordinates in both end nodes. The inertia force and the constant mass matrix of beam element are obtained. Based on the principles of continuum mechanics, the elastic forces and the stiffness matrix are deduced, which are highly non-linear polynomials of the generalized coordinates. The generalize external forces is obtained by virtual work. The stretch, shear, bending, and torsion deformation of slender beams are considered. The Possion’s locking and shear locking do not exist in this formulation. Hilber-Hughes-Taylor (HHT) integration method involved the Jacobian matrix and right-hand side is used to obtain the dynamics results. Numerical example validates the presented approach. The proposed formulation provides an effective tool for dynamics analysis of flexible slender beams, which can be accurately applied to solve the dynamics problem of multibody system with large deformations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Jacobian matrices

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Dissecting the contributions of organic nitrogen aerosols to global atmospheric nitrogen deposition and implications for ecosystems

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National science Review 2023年第12期10卷 124-136页

作者： Yumin Li Tzung-May Fu Jian Zhen Yu Xu Yu Qi Chen Ruqian Miao Yang Zhou Aoxing Zhang Jianhuai Ye Xin Yang Shu Tao Hongbin Liu Weiqi Yao Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Provincial Observation and Research Station for Coastal Atmosphere and Climate of the Greater Bay Area Southern University of Science and Technology Division of Environment and Sustainability Hong Kong University of Science and Technology National Center for Applied Mathematics Shenzhen Department of Chemistry Hong Kong University of Science and Technology State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Laboratory for Regional Pollution Control College of Environmental Sciences and Engineering Peking University Frontier Science Center for Deep Ocean Multispheres and Earth System and Physical Oceanography Laboratory Ocean University of China College of Oceanic and Atmospheric Sciences Ocean University of China Department of Ocean Science Hong Kong University of Science and Technology Department of Ocean Science and Engineering Southern University of Science and Technology

Atmospheric deposition of particulate organic nitrogen（ONp） is a significant process in the global nitrogen cycle and may be pivotally important for N-limited ***,past models largely overlo oked the spatial and chemical inhomogeneity of atmospheric ONpand were thus deficient in assessing global *** constructed a comprehensive global model of atmospheric gaseous and particulate organic nitrogen（ON）,including the latest knowledge on emissions and secondary *** this model,we simulated global atmospheric ONpabundances consistent with *** estimated global atmospheric ON deposition was 26 Tg N yr-1,predominantly in the form of ONp(23 Tg N yr-1)and mostly from wildfires（37%）,oceans（22%） and aqueous productions（17%）.Globally,ONpcontributed as much as 40% to 80% of the total N deposition downwind of biomass-burning *** ONpdeposition thus constituted the dominant external N supply to the N-limited boreal forests,tundras and the Arctic Ocean,and its importance maybe amplified in a future warming climate.

关键词： organic nitrogen aerosol secondary organic nitrogen biomass burning

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Method for Evaluating the Performance of Aircraft Collaborative Decision-Making Based on Dynamic Bayesian Network

Method for Evaluating the Performance of Aircraft Collaborat...

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2024 International Conference on Electronics and Devices, Computational science, ICEDCS 2024

作者： Zhang, Wenbo Yu, Boxiao Tong, Jiahui Li, Jing Beijing Electro-Mechanical Engineering Institute National Key Laboratory of Complex System Control and Intelligent Agent Cooperation Beijing China Beijing Institute of Technology School of Computer Science and Technology Beijing China

ISBN: (纸本)9798331527624

This research addresses the challenge of assessing equipment decision-making effectiveness in environments characterized by uncertainty and multiple influencing factors. We propose a novel approach involving the creation and optimization of a dynamic Bayesian network-based model tailored for equipment decision-making processes. The model facilitates a systematic evaluation of decision-making effectiveness by incorporating various factors, including equipment performance, environmental conditions, and enemy defensive capabilities. A comprehensive assessment system has been developed to simulate the penetration capabilities of different equipment through enemy defenses. Moreover, this study identifies potential errors in the effectiveness evaluation model by analyzing its performance in typical scenarios, pinpointing areas for enhancement. © 2024 IEEE.

关键词： Decision-making Dynamic Bayesian networks Equipment simulation Uncertainty Management

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Structural Design and Experimental Study of a Rotary Magnetorheological Damper with Higher Torque to Volume Ratio 2nd

Structural Design and Experimental Study of a Rotary Magneto...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Yan, Xinghua Zhu, Wei Institute of Launch Dynamics Nanjing University of Science and Technology No.200 Xiaolingwei Street Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

A rotary magnetorheological damper with higher torque to volume ratio based on shear and flow mixing was designed. This structure adopts a mixed working mode of shear and flow, fully combining the advantages of the two working modes. A damping torque mechanical model of a rotary magnetorheological damper was established based on the parallel plate flow model of fluid and the Bingham model of magnetorheological fluid. And the magnetic circuit was simulated and analyzed using ANSYS, and the mechanical properties were simulated and calculated. The simulation results indicate that the magnetorheological damper has a higher output damping force and a wider controllable damping range. A rotary magnetorheological damper was developed and its performance was tested. The experimental results indicate that the damper has a higher torque to volume ratio, which verifies the effectiveness of the rotary magnetorheological damper and mechanical model proposed in this paper. The work of this article provides a theoretical basis for designing a rotary magnetorheological damper with higher torque to volume ratio. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Magnetic circuits

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Miniaturization Design of TEM Horn Antenna for Ground-Penetrating Radar 15

Miniaturization Design of TEM Horn Antenna for Ground-Penetr...

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15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Li, Zhi-Hao Ma, Jing Wu, Jin Huang, Jia-Jia Lu, Yong-Han Peng, Lin Guangxi Guilin541004 China Education Department of Guangxi Zhuang Autonomous Region Guangxi Guilin541004 China Beijing Simulation Center Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9798350338874

This paper presents a miniaturized TEM horn antenna for ground penetrating radar (GPR). First, an exponential gradient horn antenna is designed with a low cut-off frequency of 0.45 GHz. Then, the low cut-off frequency is decreased to 0.19 GHz through curve structural loading and lens loading without increasing the size of the horn. The antenna size is 378.49 mm × 359.07 mm × 386.06 mm, corresponding to 0.226 λ1 × 0.238 λ1 × 0.243 λ1 ( λ1 is the wavelength corresponding to the lowest frequency of the antenna). The results show that the working bandwidth of the antenna is 0.19-3GHz, and it has a good radiation pattern in the band, with a peak gain of 12.4dBi, which would be a good candidate for GPR. © 2023 IEEE.

关键词： Horn antennas

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Enhanced thermal isolation in porous thermal barrier coatings by the formation of pore guided thermal-shock cracks

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science China(Technological sciences) 2023年第4期66卷 1007-1017页

作者： ZHEN Yu WU KaiJin LIU MengQi ZHENG SongLin HE LingHui YU Yin NI Yong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230026China National Key Laboratory of Shock Wave and Detonation Physics China Academy of Engineering PhysicsInstitute of Fluid PhysicsMianyang 621900China

Pore structure design is an effective strategy to tailor the thermal isolation capability of thermal barrier coatings(TBCs).Pursuing optimal porosity is crucial to balance the requirements of thermal isolation and mechanical reliability since the pore structure shields thermal heat transfer but increases mechanical *** this work,we investigate how thermal heat transfer couples with fracture propagation in porous TBCs by the using thermo-mechanical coupling phase field model for *** simulated results show that cracks induced by thermal shock favor deflection that is sometimes perpendicular to the direction of heat *** thermal conductivity degradation by the transverse cracks significantly impedes thermal heat transfer,leads to enhanced reduction of the effective thermal conductivity of TBCs,decreases the average thermal stress of the substrate,and thus decreases the risk of the crack penetrating into the *** numerical results demonstrate that the phase field method fully considering the thermo-mechanical interaction between cracks and pores can be a useful tool to improve the thermal isolation of porous TBCs under extreme thermal shock loadings through pore structure design.

关键词： phasefield TBCs porosity thermal shock cracks

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One-Dimensional Photonic Crystal Filter with Multiple Defect Layers Based on Particle Swarm Optimization 21st

One-Dimensional Photonic Crystal Filter with Multiple Defect...

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21st Asia simulation Conference, AsiaSim 2022

作者： Hao, Kaizi Du, Jian Ma, Jing Zhang, Ying Ma, Yiyuan Wan, Chen Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China North University of China Taiyuan030051 China

ISBN: (纸本)9789811991974

In this paper, the defect mode of one-dimensional photonic crystal was studied. For photonic crystal with one defect layer, the effects of refractive index and thickness of defect layer, photon period number and incident angle on defect mode were discussed. Photonic crystal structure with multiple defect layers was constructed, and multiple defect modes were obtained in the forbidden band. Based on the photonic crystal structure with two defect layers, a dual-channel narrow-band filter operating at 480 nm and 532 nm was designed. Particle swarm optimization algorithm was introduced to optimize the position and transmittance of defect modes, which mainly depended on the thickness of defect layer. The calculation results showed that the transmittance of the two defect modes reached 97.52% and 97.55%, respectively, while the full width at half maximum was only 1.0 nm and 1.8 nm. The simulation of the electric field distribution further proved the correctness of the design results. The research results had important value in the field of underwater laser communication. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Photonic crystals

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A Runtime Verification Tool for Distributed simulation systems 5th

A Runtime Verification Tool for Distributed Simulation Syst...

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5th China Conference on Intelligent Networked Things, CINT 2022

作者： Zhang, Lianyi Qing, Duzheng Zhang, Han Wang, Qingyun Laili, Yuanjun Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing China Beijing Institute of Electronic System Engineering Beijing China Beihang University Beijing China

ISBN: (纸本)9789811989148

Distributed simulation systems are complex systems that may suffer from runtime uncertainty or runtime errors. The core of defect detection in distributed simulation systems is to effectively traverse the state space of communication between nodes in the system. In a distributed simulation system, simulation nodes communicate and exchange data through event requests. Different event interaction sequences constitute different states of system behavior. Therefore, an efficient traversal of the state space can be transformed into sequential control of event requests in the system. This paper mainly studies the hybrid method based on software testing and model checking to perform runtime verification of the temporal properties of distributed simulation systems. We develop the runtime verification tool TempoRV. It monitors the distributed simulation system and responds immediately when the behavior of the system violated certain temporal properties. Finally, to illustrate the effectiveness of the proposed tool, we conduct a case study to show that TempoRV provides an important guarantee for the temporal correctness of distributed simulation systems. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Software testing

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