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共 2023 条记录，以下是131-140 订阅

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Dynamics Modelling and simulation of Parachute Cluster Based on Rmstmm 2nd

Dynamics Modelling and Simulation of Parachute Cluster Based...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Wang, Youyu Wang, Guoping Sun, Yutian Han, Chongwei Gu, Lilin 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 parachute system in the steady descent phase consists of four main parachutes, riser, artillery cargo and so on, is a typical multibody system. In this paper, a parachute cluster dynamics model considering the contact collision between each main parachute is first established based on the reduced multibody transfer matrix method (RMSTMM) which is no need for global dynamic equations and has high computational speed. The dynamics responses of the cargo are compared with Newton–Euler method under the wind condition. The dynamics model for parachute cluster established by RMSTMM is validated. The research of this paper lays a foundation for rapid modelling and simulation of the cargo airdrop. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Parachutes

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Design and Experimental Study of Magnetorheological Recoil Device Dynamics 2nd

Design and Experimental Study of Magnetorheological Recoil D...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Wang, Lingyun Zhu, Wei Jiang, Min Yan, Zhengwei Jiang, Yuxin Xu, Xiucai 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

A magnetorheological fluid-based recoil device (MRRD) is designed. By designing the structural parameters such as the throttle bar, with the damping controllability of the magnetorheological material, a more ideal control curve is obtained, which can ensure the smallest possible recoil resistance or displacement. The magnetic circuit simulation of the designed recoil system is carried out by using the electromagnetic field finite element analysis software, and the magnetic field distribution of the recoil system under various operating conditions such as different structural parameters, saturation current and damping channels are solved and analyzed to provide a certain basis for the design and magnetic field analysis of the MRRD. The magnetorheological performance test of the system is also carried out. The calculation and test results show that the designed MRRD meets the structural and magnetic circuit design requirements and has good magnetorheological characteristics, it provides a good basis for subsequent experiments and research. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Magnetorheological fluids

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Dual-Polarized Wideband Wide-Beam Millimeter-Wave Magneto-Electric Dipole Antenna

Dual-Polarized Wideband Wide-Beam Millimeter-Wave Magneto-El...

引用

2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Gou, Linglong Ma, Jing Shi, Bin Zhu, Zhongbo Peng, Lin Guilin University of Electronic Technology Key Laboratory of Microwave and Optical Wave Application Technology Guangxi Guilin541004 China Beijing Simulation Center The Science and Technology on Special System Simulation Laboratory Beijing100854 China The National Key Laboratory of Science and Technology on Space Microwave Xi'an710100 China

ISBN: (纸本)9798350358971

In this manuscript, a dual-polarized wideband wide beamwidth magneto-electric (ME) dipole antenna for millimeter-wave mobile communication is proposed. As can be seen from the simulation results, this design exhibits excellent performance. Owing to the mutual resonances of the magnetic dipole and the electric dipole, large bandwidths of 64.8% and 59% (18.4 GHz-33 GHz and 17.29 GHz-33.9 GHz) are obtained for the two polarizations, respectively. The isolation between the two ports is greater than 25 dB. By loading metal vias, the antenna's beamwidth is widened to more than 100° through the whole operating band. The antenna size is 5mm×5 mm ×1.72 mm, and this compact structure is quite suitable for using in beam scanning antennas. © 2023 IEEE.

关键词： dual-polarization millimeter-wave (mm-wave) wideband

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Free Vibration of Double Beam system Based on the Multibody system Transfer Matrix Method 2nd

Free Vibration of Double Beam System Based on the Multibody ...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Hu, Shaoheng Liu, Zhengquan Rui, Xiaoting Gu, Junjie 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

Beam structures are widely acknowledged as fundamental components in mechanical, aerospace, and structural engineering domains. As technology continues to advance, the use of double-beam systems is becoming increasingly prevalent in various engineering applications. In this paper, a method is introduced to model and analysis of a double beam system utilizing the Multibody system Transfer Matrix Method (MSTMM). The modeling process involves the derivation of transfer matrices for the double-beam system, dummy body-spring-dummy body system, which are subsequently assembled in sequence based on the direction of transfer. The global dynamics equations and the system inertia matrix are obviated. The resulting model is simple yet efficient, and the presented results demonstrate the effectiveness of the approach for the structural analysis of double-beam systems. This study offers a new insight into the modelling and analysis of such systems and makes a worthwhile contribution to the field of engineering. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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Launching Charge Extrusion Crushing Dynamics simulation Software 2nd

Launching Charge Extrusion Crushing Dynamics Simulation Soft...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhang, Jialei Wang, Guoping Rui, Xiaoting Wang, Yan Li, Chao Dong, Xiaoli Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China Key Laboratory of MIIT System Dynamics of Complex Equipment Nanjing China

ISBN: (纸本)9789819980475

The critical factor contributing to the propellant chamber blast is the collision and extrusion of propellant, which causes a significant number of propellant particles to break up. The dynamic simulation of extrusion and crushing during propellant launching in the chamber is critical to solving this significant challenge. In this research, a simulation software for the extrusion and crushing dynamics of propellant is constructed using the discrete element method. The software can create an extrusion and crushing dynamics model of propellant based on the extrusion and crushing dynamics of propellant studied by users by inputting and defining boundary conditions such as propellant geometry and size, number of pellets, and cartridge size. The crushing process of the propellant under external load can then be simulated and animated by inputting parameters such as the mechanical properties of the propellant and the time history of external load, as well as setting simulation control parameters such as calculation time step and discrete radius, and the calculated results can be output in the form of data and animation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Extrusion

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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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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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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...

引用

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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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...

引用

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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A Fluid–Solid Coupled Calculation Method of Shock-to-Detonation Transition in High Explosives 2nd

A Fluid–Solid Coupled Calculation Method of Shock-to-Detona...

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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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