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Study on the coupling calculation method for the launch dynamics of a self-propelled artillery multibody system considering engraving process

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Defence Technology（防务技术） 2024年第9期39卷 67-85页

作者： Shujun Zhang xiaoting rui Hailong Yu Xiaoli Dong Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Complex Multibody System Dynamics Nanjing 210094China

The launch dynamics theory for multibody systems emerges as an innovative and efficacious approach for the study of launch dynamics,capable of addressing the challenges of complex modeling,diminished computational efficiency,and imprecise analyses of system dynamic responses found in the dynamics research of intricate multi-rigid-flexible body systems,such as self-propelled *** advancement aims to enhance the firing accuracy and launch safety of self-propelled *** the shortfall of overlooking the band engraving process in existing theories,this study introduces a novel coupling calculation methodology for the launch dynamics of a self-propelled artillery multibody *** method leverages the ABAQUS subroutine interface VUAMP to compute the dynamic response of the projectile and barrel during the launch process of large-caliber self-propelled ***,it examines the changes in projectile resistance and band deformation in relation to projectile motion throughout the band engraving *** analysis of the computational outcomes with experimental data evidences that the proposed method offers a more precise depiction of the launch process of self-propelled artillery,thereby enhancing the accuracy of launch dynamics calculations for self-propelled artillery.

关键词： Self-propelled artillery Engraving process Multibody system dynamics Launch dynamics

Transfer matrix method for multibody systems(rui method) and its applications

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Science China(Technological Sciences) 2019年第5期62卷 712-720页

作者： rui xiaoting WANG Xun ZHOU QinBo ZHANG JianShu Institute of Launch Dynamics Nanjing University of Science and Technology

The transfer matrix method for multibody systems, namely the "rui method", is a new method for studying multibody system dynamics, which avoids the global dynamics equations of the system, keeps high computational speed, and allows highly formalized programming. It has been widely applied to scientific research and key engineering of lots of complex mechanical systems in 52 research directions. The following aspects regarding the transfer matrix method for multibody systems are reviewed systematically in this paper: history, basic principles, formulas, algorithm, automatic deduction theorem of overall transfer equation, visualized simulation and design software, highlights, tendency, and applications in 52 research directions in over 100 key engineering products.

关键词： multibody system dynamics transfer matrix method for multibody systems rui method automatic deduction theorem of overall transfer equation theory computation software applications

Optimal design of 6-DOF vibration isolation platform based on transfer matrix method for multibody systems

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Acta Mechanica Sinica 2021年第1期37卷 127-137,I0004页

作者： Min Jiang xiaoting rui Wei Zhu Fufeng Yang Yanni Zhang Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing210094China

The structure parameters of 6-degree of freedom(DOF)vibration isolation platform have a significant effect on its *** make the designed vibration isolation platform perform well,non-dominanted sorting genetic algorithm version II(NSGA-II)was applied to optimize its structure based on the transfer matrix method for multibody ***,the Jacobian matrix of 6-DOF vibration isolation platform was solved based on ***,the transfer equation of 6-DOF vibration isolation system was established by the linear transfer matrix method for multibody *** the formula of its natural frequency was derived according to the boundary conditions of the ***,the manipulability index was constructed based on a dimensionless Jacobian *** a new performance index function was established considering the influence of dynamic isotropic and legs ***,genetic algorithm(GA)and NSGA-II were used to optimize the structure of the 6-DOF vibration isolation platform under the same conditions,*** showed that NSGA-II had higher optimization efficiency,better calculation accuracy and shorter optimization time than that of ***,NSGA-II was adopted for multi-objective optimization design of 6-DOF vibration isolation platform based on the constraint *** Pareto solutions were obtained,which provides structural parameters for subsequent design ***,the proposed optimization method and the performance index in this paper provide a theoretical basis for the optimal design of relevant vibration isolation mechanism.

关键词： Optimal design 6-DOF vibration isolation Transfer matrix method Non-dominanted sorting genetic algorithm version II(NSGA-II)

Dynamic Simulation of Space Debris Cloud Capture Using the Tethered Net

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Space(Science & Technology) 2021年第1期2021卷 153-163页

作者： Qingtao Wang Dongping Jin xiaoting rui School of Science Nanjing University of Science and TechnologyNanjing 210094China Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Space debris,especially the space debris cloud,has threatened severely the safety of future space *** the framework of multibody system dynamics,a computational approach is proposed in this study to investigate the dynamics of net deployment and capture of space debris cloud using this net subject to large overall motions and large *** obtain high simulation fidelity of capturing space debris cloud,the gradient deficient beam element of the absolute nodal coordinate formulation(ANCF)is employed to discretize threads which are woven into the *** normal contact force between the net and the debris cloud and among debris particles is computed by using the penalty *** deployment examples are presented to investigate the influences of shooting velocity of bullets and microgravity as well as the angle between the traveling direction of the net and the microgravity direction on the deployment characteristics of the tethered *** capturing examples are given to clarify the effect of the deployment area of the net at the moment it starts to contact with the debris cloud on the capture rate and to demonstrate the effectiveness of the proposed approach for capturing space debris cloud using the net in microgravity conditions.

关键词： Capture debris Simulation

Discrete time transfer matrix method for dynamics analysis of complex weapon systems

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Science China(Technological Sciences) 2011年第5期54卷 1061-1071页

作者： rui xiaoting RONG Bao WANG GuoPing HE Bin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing 210094 China

Efficient, precise dynamic modeling and analysis for complex weapon systems have become more and more important in their dynamic design and performance optimizing. As a new method developed in recent years, the discrete time transfer matrix method of multibody system is highly efficient for multibody system dynamics. In this paper, taking a shipboard gun system as an example, by deducing some new transfer equations of elements, the discrete time transfer matrix method of multibody sys- tem is used to solve the dynamics problems of complex rigid-flexible coupling weapon systems successfully. This method does not need the global dynamic equations of system and has the low order of system matrix, high computational efficiency. The proposed method has advantages for dynamic design of complex weapon systems, and can be carried over straightforwardly to other complex mechanical systems.

关键词： multibody system dynamics transfer matrix method shipboard gun finite element

Dynamic modeling and H_∞ independent modal space vibration control of laminate plates

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1638-1650页

作者： RONG Bao rui xiaoting WANG GuoPing YANG FuFeng Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing 210094 China

In this paper, combining the transfer matrix method and the finite element method, the modified finite element transfer matrix method is presented for high efficient dynamic modeling of laminated plates. Then, by constructing the modal filter and the disturbance force observer, and using the feedback and feedforward approaches, the H ∞ independent modal space control strategy is designed for active vibration control of laminate plates subjected to arbitrary, immeasurable disturbance forces. Compared with ordinary dynamic modeling and control methods of laminated plate structures, the proposed method has the low memory requirement, high computational efficiency and robust control performance. Formulations as well as some numerical examples are given to validate the method and the control performance.

关键词： transfer matrix method finite element laminated plate active vibration control H~ control

Ballistic Trajectory Extrapolation and Correction of Firing Precision for Multiple Launch Rocket System

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第2期36卷 232-241页

作者： ZHA Qicheng rui xiaoting WANG Guoping YU Hailong Institute of Launch Dynamics School of Energy and Power EngineeringNanjing University of Science and Technology

The research on multiple launch rocket system(MLRS)is now even more demanding in terms of reducing the time for dynamic calculations and improving the firing accuracy,keeping the cost as low as *** study employs multibody system transfer matrix method(MSTMM),to model *** use of this method provides effective and fast calculations of dynamic characteristics,initial disturbance and firing ***,a new method of rapid extrapolation of ballistic trajectory of MLRS is proposed by using the position information of radar *** extrapolation point is then simulated and compared with the actual results,which demonstrates a good *** closed?loop fire correction method is used to improve the firing accuracy of MLRS at low cost.

关键词： multi-body system transfer matrix method(MSTMM) multiple launch rocket system(MLRS) dynamic modeling ballistic trajectory extrapolation fire correction method

An Algorithm for Determination of Projectile Attitude Angles in Projectile Trajectory Prediction

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 361-370页

作者： Zha Qicheng rui xiaoting Yu Hailong Zhou Qinbo Institute of Launch Dynamics School of Energy and Power EngineeringNanjing University of Science and Technology

A fast and accurate algorithm is established in this paper to increase the precision of ballistic trajectory *** algorithm is based on the six-degree-of-freedom(6 DOF)trajectory equations,to estimate the projectile attitude angles in every measuring ***,the algorithm utilizes the Davidon-Fletcher-Powell(DFP)method to solve nonlinear equations and Doppler radar trajectory test information containing only position coordinates of the projectile to reconstruct the angular ***″position coordinates by the test″and″angular displacements by reconstruction″at the end phase of the radar measurement are used as an initial value for the trajectory computation to extrapolate the trajectory impact *** numerical simulations validate the proposed method and demonstrate that the estimated impact point agrees very well with the real ***,other artillery trajectory can be predicted by the algorithm,and other trajectory models,such as 4 DOF and 5 DOF models,can also be incorporated into the proposed algorithm.

关键词： ballistic trajectory impact point prediction Davidon-Fletcher-Powell method six-degree-of-freedom trajectory model Doppler radar data

Transfer matrix method for determination of the natural vibration characteristics of elastically coupled launch vehicle boosters

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Acta Mechanica Sinica 2015年第4期31卷 570-580页

作者： Laith K.Abbas Qinbo Zhou Hossam Hendy xiaoting rui Institute of Launch Dynamics Nanjing University of Science and Technology

The analysis of natural vibration characteristics has become one of important steps of the manufacture and dynamic design in the aerospace industry. This paper presents a new scenario called virtual cutting in the context of the transfer matrix method of linear multibody systems closed- loop topology for computing the free vibration characteristics of elastically coupled flexible launch vehicle boosters. In this approach, the coupled system is idealized as a triple-beam system-like structure coupled by linear translational springs, where a non-uniform free-free Euler-Bemoulli beam is used. A large thrust-to-weight ratio leads to large axial accelera- tions that result in an axial inertia load distribution from nose to tail. Consequently, it causes the development of significant compressive forces along the length of the launch vehicle. Therefore, it is important to take into account this effect in the transverse vibration model. This scenario does not need the global dynamics equations of a system, and it has high computational efficiency and low memory requirements. The validity of the presented scenario is achieved through com- parison to other approaches published in the literature.

关键词： Transfer matrix method of linear multibodysystems Free vibration characteristics Coupled launchvehicle boosters