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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Dong, Xiaoli Rui, Xiaoting Li, Chao Zhao, Xin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

The shock-to-detonation transition (SDT) may occur in the entire explosive lifecycle, including production, storage, transportation, and usage. Shock sensitivity is one of the main indicators for safety evaluation and initiation reliability. Due to the complexity and transience of the SDT, the existing test, measurement, and device cannot fully meet the research needs, and numerical simulation is still a powerful tool. The SDT in explosives is characterized by high strain rates and large deformation. In pure reactive flow dynamic calculations, the confined tube is considered rigid. Actually, the tube strength is limited, and its mechanical response inevitably affects the reaction and flow inside. Considering the computing termination caused by mesh distortion in Lagrange methods, an Euler method for fluid–solid coupled dynamics is developed. This theory involves reactive flow dynamics, elastic–plastic mechanics, and interface tracking technology. The conservation element and solution element (CE/SE) method is applied to solve governing equations, and the calculated state parameters at the von Neumann spike agree well with theoretical values. Then the mechanical response of the tube and the expansion of reaction products are analyzed in depth. Overall, this work provides an approach to gain better insight into the SDT of actual explosive charge. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Strain rate

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Research on Simulation and Optimization of Pulse Controlled Multiple Launch Rocket system 2nd

Research on Simulation and Optimization of Pulse Controlled ...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Gu, Lilin Rui, Xiaoting Wang, Guoping Wei, Min Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Multiple Launch Rocket system (MLRS) has been widely used all around the world due to the advantages such as high firing speed, large firing area, long firing range, good mobility and heavy firepower density weaved in a short period time. The Pulse Controlled Multiple Launch Rocket system (PCMLRS) is able to suppress the vibration during launching process by applying the pulse thrusters, which helps improve its dispersion characteristics. In this paper, the system composition of PCMLRS is introduced and the simulation system of PCMLRS is built using the Multibody system Transfer Matrix Method, based on which the pulse control parameters are optimized. The simulation results show that the firing dispersion of PCMLRS is improved, which indicates good engineering application prospects. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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An Assessment Method of Launch Safety of Propellant Charge Based on Information Measure Equivalency 2nd

An Assessment Method of Launch Safety of Propellant Charge B...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Lin, Zhicheng Wang, Yan Li, Chao Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

In order to address the issue of excessively large sample sizes required by classical statistical methods for evaluating the launch safety of propellant charges in artillery, a novel approach for quantitative evaluation of launch safety based on the dynamic activity ratio of initial launch was proposed. This approach utilizes an information-equivalent methodology, whereby a small number of experiments under rigorous conditions can provide safety information equivalent to that obtained by classical methods using large sample sizes. By implementing this approach, the launch safety of propellant charges can be accurately determined using a much smaller number of samples. To validate the proposed method, evaluations were performed on the launch safety of propellant charges utilized in typical large-caliber artillery. The results demonstrated a significant reduction in the required sample size, thereby confirming the correctness and feasibility of this approach. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Propellants

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Static Response of a Multiple Launch Rocket system During Launch Using Linear Multibody system Transfer Matrix Method 2nd

Static Response of a Multiple Launch Rocket System During La...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Huang, Hongfei Zhou, Qinbo Wang, Guoping He, Bin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

The mass and its distribution of a multiple launch rocket system (MLRS), from which rockets shoot successively, vary continuously during the firing. The system response comprises a static response caused by gravity changes leading to the deviation from an initial equilibrium configuration (EC) to a current EC, and a dynamic response relative to the current EC. The simulation results of launch dynamics and firing precision will diverge from reality if the change of the system’s EC is ignored throughout the firing process. Thus, it is crucial to accurately and rapidly calculate the static response of an MLRS during firing. In this work, the static response due to the mass changes of an MLRS during the firing process is studied using the linear multibody system transfer matrix method (MSTMM). To consider the change of mass and its distribution of the pitching part caused by the shot rockets, an equivalent force-system model is proposed. The static response of the system due to the change of mass can be attributed to the static response of the original system subjected to the additional force system, which can be obtained by using the linear MSTMM to compute the steady-state response of the original system with the excitation frequency of the additional force system being zero. The proposed method can fast compute the static response (both position and orientation) of each body element due to the mass change. It also provides a theoretical basis for accurate computation of the launch dynamics of a multibody system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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Research on Missile Vibration Characteristics Considering Engine Vibration Based on Mstmm 2nd

Research on Missile Vibration Characteristics Considering En...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Pu, Yiwen Gu, Lilin Wang, Guoping Liu, Zhengquan Tang, Jinxin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Missile has the advantages of fast speed and strong penetration ability. It has become the main way of high precision strike in modern battleground. The vibration of the missile engine will affect its safety and stability during the active flight. In this paper, Reduced multibody transfer matrix method is used to introduce engine vibration in the missile model considering thrust, establish a missile dynamics model of the active segment flight, derive the total transfer matrix and total transfer equation, and quickly and accurately calculate the transient response of the active segment flight of a certain type of missile, which provides an effective method for studying the influence of engine vibration on the flight performance of the active segment of the missile. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Missiles

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Numerical Study of Centrifugal Dewatering Process of Cotton Fibers 2nd

Numerical Study of Centrifugal Dewatering Process of Cotton ...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Li, Da Rong, Bao Rui, Xiaoting Liu, Yixin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Cotton fiber is a natural material composed of cellulose that exhibits excellent water absorption properties. Centrifugal dewatering is typically required during the processing of cotton fibers. However, the water absorbed by the fibers can affect the dewatering process, leading to reduced efficiency and lower quality. To investigate the effects of factors such as fiber water absorption and centrifugal speed on the dewatering process, a numerical model based on the conservation of liquid inside and outside the fiber was developed in this study. The findings provide valuable insights into the dewatering process of cotton fiber-like materials and serve as an important theoretical foundation for future research in this area. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Numerical models

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Improved Image Matching Method Between SAR and Optical Based on Gaussian Vote by Ballot 11th

Improved Image Matching Method Between SAR and Optical Based...

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11th China Conference on Command and Control, C2 2023

作者： Yang, Yanjiao Wang, Ziwei Qu, Guangzhou Ma, Meng Liu, ShuaiShuai Chi, QingXi Beijing Electro-Mechanical Engineering Institute Beijing China Science and Technology on Complex System Control and Intelligent Agent Coopration Laboratory Beijing China

ISBN: (纸本)9789819990207

Aiming to obtain the high-precision matching position and reduce time and resource requirements, an image matching method between SAR and optical based on CSP-DenseNet and Gaussian vote by ballot is proposed. First, in order to detect stable interest points and extract deep feature in SAR image, we use FAST operator and CSP-DenseNet. Then, in order to save time and resource requirements, we use gaussian vote by ballot to determine the high-precision matching position between two *** simulation results reveal the validity of the algorithm. © Chinese Institute of Command and Control 2024.

关键词： Synthetic aperture radar

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Game Analysis of Software Development Price 3

Game Analysis of Software Development Price

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3rd International Conference on Computer Engineering and Intelligent Control, ICCEIC 2022

作者： Wang, Hongpo Shao, Shuai Lin, Jia Science and Technology on Complex Aviation System Simulation Laboratory Beijing China

How to effectively control the cost of software development and improve the cost efficiency has always been the focus of party A. Software cost estimation process is discussed in this paper, we studied the purchasing behavior of both sides, based on the game theory to build the party A and party B the purchase price game model of the enterprise, won the party A and party B to take different strategies of Nash equilibrium, the two sides are discussed under different parameters of the strategy, the analysis result was combing inductive. It is pointed out that demonstration + price review is the best choice of party A's price control method, which can reduce the cost of audit and have a deterrent effect on party B's enterprises, so as to standardize the quotation behavior of enterprises. The analysis also points out that the control of software development cost should be balanced comprehensively, and economic benefit should not be emphasized blindly. © 2022 Copyright for this paper by its authors.

关键词： Cost estimating

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Recommendation Based on Knowledge Graph and Graph Neural Network 7th

Recommendation Based on Knowledge Graph and Graph Neural Net...

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7th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2023

作者： Shen, Hongjie Guo, Qiuhao Xu, Hongfeng Jiang, Jixiang Chen, Linxiu Zhejiang Huzhou Aviation Intelligent Technology Research Center Hangzhou310000 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9789819733231

The recommendation system based on knowledge graph assistance has more advantages than the traditional recommendation system, mainly reflected in: accurate, efficient and explainable. Most of the recommendation methods of existing studies use knowledge graph representation learning for information mining of entity features, but some of them ignore the neighborhood information of knowledge graph entities, resulting in the loss of high-order feature information. Considering the above problem, this study proposes a recommendation method based on graph neural network for the problem that the existing recommendation methods ignore the overall information in the process of knowledge graph entity information mining. The graph attention network is introduced to carry out neighborhood information aggregation to make up for the neighborhood information of missing entities in the process of extracting the features of the knowledge graph in existing research. In this study, the prediction experiments of click rate and top-k recommendation scenarios were carried out on the data under the four backgrounds of movies, books, online courses and music, and the influence of some key parameters and structures in the model on the model was analyzed, compared and discussed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Recommender systems

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Intelligent optimization methods of phase-modulation waveform

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Journal of systems Engineering and Electronics 2022年第4期33卷 916-923页

作者： SUN Jianwei WANG Chao SHI Qingzhan REN Wenbo YAO Zekun YUAN Naichang College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense TechnologyChangsha 410073China

With the continuous improvement of radar intelligence, it is difficult for traditional countermeasures to achieve ideal results. In order to deal with complex, changeable, and unknown threat signals in the complex electromagnetic environment, a waveform intelligent optimization model based on intelligent optimization algorithm is proposed. By virtue of the universality and fast running speed of the intelligent optimization algorithm, the model can optimize the parameters used to synthesize the countermeasure waveform according to different external signals, so as to improve the countermeasure *** algorithm(GA) and particle swarm optimization(PSO)are used to simulate the intelligent optimization of interruptedsampling and phase-modulation repeater waveform. The experimental results under different radar signal conditions show that the scheme is feasible. The performance comparison between the algorithms and some problems in the experimental results also provide a certain reference for the follow-up work.

关键词： waveform optimization intelligent optimization phase-modulation genetic algorithm(GA) particle swarm optimization(PSO)

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