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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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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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Fixed-Time Consensus-Based Nash Equilibrium Seeking

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 267-269页

作者： Mengwei Sun Jian Liu Lu Ren Changyin Sun the Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China IEEE the School of Automation and the Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of EducationSoutheast UniversityNanjing 210096China the School of Artificial Intelligence and the Engineering Research Center of Autonomous Unmanned System Technology Ministry of EducationAnhui UniversityHefei 230601China

Dear Editor,This letter examines the fixed-time stability of the Nash equilibrium(NE)in non-cooperative *** propose a consensus-based NE seeking algorithm for situations where players do not have perfect information and communicate via a topology *** proposed algorithm can achieve NE in a fixed time that does not depend on initial conditions and can be adjusted in advance.

关键词： Fixed seeking letter

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An unsupervised deep learning framework for gene regulatory network inference from single-cell expression data

An unsupervised deep learning framework for gene regulatory ...

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2023 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2023

作者： Mao, Guo Liu, Jie National University of Defense Technology Science and Technology on Parallel and Distributed Processing Laboratory Changsha410073 China National University of Defense Technology Science and Technology on Parallel and Distributed Processing Laboratory National University of Defense Technology Laboratory of Software Engineering for Complex System Changsha410073 China

ISBN: (纸本)9798350337488

Recent advances in single-cell RNA sequencing (scRNA-seq) technology provides unprecedented opportunities for reconstruction gene regulation networks (GRNs). At present, many different models have been proposed to infer GRN from a large number of RNA-seq data, but most deep learning models use a priori gene regulatory network to infer potential GRNs. It is a challenge to reconstruct GRNs from scRNA-seq data due to the noise and sparsity introduced by the dropout effect. Here, we propose GAALink, a novel unsupervised deep learning method. It first constructs the gene similarity matrix and then refines it by threshold value. It then learns feature representations of genes through a graphical attention autoencoder that propagates information across genes with different weights. Finally, we use gene feature expression for matrix completion such that the GRNs are reconstructed. Compared with seven existing GRNs reconstruction methods, GAALink achieves more accurate performance on seven scRNA-seq dataset with four ground truth networks. GAALink can provide a useful tool for inferring GRNs for scRNA-seq expression data. © 2023 IEEE.

关键词： Feature representations Gene similarity matrix Graphical attention autoencoder Matrix completion Unsupervised deep learning method

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Distributed Event-Triggered Cooperative Formation Control of Fixed-Wing UAV 1

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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Yue, Keyuan Yuan, Jianquan Hao, Mingrui Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (数字)9789811694929

ISBN: (纸本)9789811694912

In order to save the communication bandwidth between the fixed-wing unmanned aerial vehicles (UAVs), a cooperative formation control algorithm based on event-triggered communication mechanism is proposed in this paper. The aircraft uses a state estimator to estimate the states of other aircrafts, and when the state of the aircraft itself exceeds a certain threshold, its state information is sent to the neighboring aircraft through the data link, so that the neighboring aircraft updates the states of its estimator. Taking the established autopilot model with a 6-dof inner-loop attitude stabilization loop as the formation control object, a multi-aircraft outer-loop formation controller is designed based on the consensus algorithm. Through numerical simulation, under the condition of ensuring certain control performance of the aircraft cluster, the communication between aircrafts is reduced and bandwidth resources are saved, which verifies the effectiveness of the proposed algorithm. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Fixed wings

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