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共 2031 条记录，以下是121-130 订阅

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An ISAR Image Reconstruction Method via Signal Support Reweighted l1 Minimization 2

An ISAR Image Reconstruction Method via Signal Support Rewei...

引用

2nd IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2024

作者： Zhao, Tiehua Wu, Qihua Xu, Zhiming Ai, Xiaofeng Zhao, Feng Xiao, Shunping National University of Defense Technology The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Technology Changsha China

ISBN: (纸本)9798331515669

The sparse aperture caused by data loss or unintentional interference is the actual problem in radar imaging process. Therefore, a compressed sensing (CS) based ISAR image reconstruction method with signal support aided is proposed in this paper. Firstly, the signal support is constructed from FFT-based imaging results. Then the signal support is introduced as a prior information into the reweighted function during the CS reconstruction. The simulation results show that, when the azimuth effective aperture ratio is as low as 30 % and signal-to-noise ratio (SNR) equals to -10 dB, the proposed method can obtain clear imaging results like that of complete aperture data. Besides, compared with the traditional CS reconstruction method, the number of false points in the reconstruction results by proposed method is greatly reduced. © 2024 IEEE.

关键词： Radar imaging

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Morphing-Aided Maneuver Control of Morphing Aircraft with Variable Wing Span and Sweep Angle

Morphing-Aided Maneuver Control of Morphing Aircraft with Va...

引用

International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Wang, Zijian Hou, Mingzhe Hao, Mingrui Harbin Institute of Technology Harbin China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9789811966125

This paper presents a longitudinal morphing-aided maneuver control model of an aircraft which could change wing span and change sweep angle, and solved the morphing aircraft control problem of parameter uncertainty and external disturbance by a robust composite control strategy with nonlinear control allocation. Based on DATCOM simulation software and nonlinear least square interpolation, the aerodynamic model is obtained, and established the longitudinal morphing-aided maneuver control model of morphing aircraft. To ensure the maneuverability of the morphing aircraft, a nominal controller which could converge in finite time is designed. The integral sliding mode disturbance observer with super screw control is designed to eliminate the tremor, and the uncertainties and external disturbances are observed and compensated. Then the obtained control signals are assigned to each control inputs through nonlinear control allocation. The simulation result show the effectiveness of the scheme, and prove that the aircraft has good tracking performance by independently changing the shape to assist the traditional control surface. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Aircraft control

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An In-Bore Projectile and a Flexible Tube Seen as a Superelement in Launch Dynamics Using Reduced Multibody system Transfer Matrix Method 2nd

An In-Bore Projectile and a Flexible Tube Seen as a Superele...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhou, Qinbo Zhang, Jianshu Wang, Xun Li, Geng Rui, Xiaoting 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

Launch dynamics of multibody systems (LDMS) studies the forces and motions of the rigid-flexible coupled multibody system composed of an artillery and a projectile during the launch process. In the authors’ previous work, the marching fire of LDMS where the launching carrier experiences a large overall motion in space is simulated, with the artillery being formulated by the multibody system transfer matrix method (MSTMM) and the projectile by the Newton–Euler method. However, such a hybrid formulation does not facilitate the study of LDMS. In this paper, the marching fire of LDMS is formulated in a unified framework of the reduced MSTMM. This is achieved by treating the flexible tube and the rigid projectile as a superelement and deducing the reduced transformation at the output end O of the superelement. The kinematics and kinetics of the superelement are analyzed and then used as basic equations for such deduction. The derived reduced transformation fits for launching subsystem with marching fire including rocket-launcher, and projectile-artillery with or without rifling. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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Experimental Investigation into the Acoustic Black Hole Vibrating Absorbing Effect and Its Automotive Applications 2nd

Experimental Investigation into the Acoustic Black Hole Vibr...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhang, Yanni Tong, Manlin Huang, Kaixing Yang, Fufeng Rui, Xiaoting 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

Damping of structural vibration using acoustic black hole (ABH) has shown great potential in vibration and sound control area. A great variety of ABH structures have been proposed and investigated based on theoretical, numerical and experimental methods. The experimental test of ABH effect applied to a real equipment is still lacking. In this paper, the experimental investigation into the ABH’s vibrating absorbing effect and its automotive applications are reported. An ABH dynamic vibration absorber (ABH-DVA) is manufactured and attached to the surface of the engine-cover, in order to absorbing the vibration of the cover transmitted by the operating engine. The vibration and sound radiation are measured with and without the ABH-DVA. Results show that the proposed ABH-DVA could provide an effective damping for the vibration and sound radiation of the engine cover in a nearly non-intrusive manner. This work thus demonstrates the potential of ABH in the application of automotive vibration and sound control. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Stars

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Study on Interval Optimization of Interior Ballistic of Large-Caliber Artillery 2nd

Study on Interval Optimization of Interior Ballistic of Larg...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： He, Xinjia Rui, Xiaoting Wang, Yan Institution 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 research method of artillery interior ballistics uncertainty optimization based on interval optimization is proposed. Firstly, the classical interior ballistics model of large caliber gun is established, and then the uncertain vector is described in the form of interval, and the interval uncertain optimization model is obtained. Finally, the interval uncertainty model is transformed by the interval order relationship and interval possibility model. The optimization result is Pareto optimal solutions. Under the constraint of maximum breech pressure, the maximum muzzle velocity can be increased by about 7 m/s. The results obtained provide a reference for the optimization of interior ballistic performance of large caliber guns under the conditions of uncertainty such as propellant parameters. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Pareto principle

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Image Matching Method for SAR and Optical Image Based on Siamese Network 1

引用

3rd International Conference on Autonomous Unmanned systems, ICAUS 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 Cooperation Laboratory Beijing China

ISBN: (数字)9789819710874

ISBN: (纸本)9789819710867

Aiming at the difficulty of the similarity extraction between the SAR and optical satellite image, an image Matching method for SAR and Optical image based on siamese network is studied. The radar system can provide SAR images while also providing SAR distance and other measurement information. Optical satellites can obtain real-time optical images and provide corresponding longitude and latitude information. Based on the satellite positioning algorithm, the cumulative error of sins can be corrected by kalman filter using SAR and optical image matching results and SAR measurements. simulation results show the effectiveness of the algorithm. © Beijing HIWING Scientific and Technological Information Institute 2024.

关键词： Synthetic aperture radar

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Dynamics Modeling and simulation of Configuration in Corotating Twin Screw Extruder 2nd

Dynamics Modeling and Simulation of Configuration in Corotat...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Xiao, Zhanhong Rong, Bao Rui, Xiaoting Zhao, Pu 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

Twin-screw extrusion technology, characterized by its continuity, flexibility, and automation, has become increasingly important in the production process of energetic materials. However, traditional civil twin-screw extruders are unsuitable for producing energetic materials with high mechanical and temperature sensitivity due to process and safety limitations. It is imperative to design and optimize a twin-screw extruder suitable for the production process of energetic materials. In this study, nine groups of screw configurations were designed using Ludovic Software, based on an existing twin-screw extruder in a factory. The effect of screw configuration on the critical stimulus of single-base propellant extrusion process was investigated, and the optimal screw configuration was selected. The results indicate that the peak pressure decreases with the reduction of compression segments, while the peak temperature increases with the increase of variable pitch threads. Moreover, the mean residence time increases with the increase of mixing segments. The proportion of viscous heat increases with the increase of compression sections and exhibits different changing trends at different temperatures under the barrel. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Extrusion

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Three-Dimensional Solid Shaft Super-Element Transfer Matrix Method for Steady-State Response Analysis of Isotropic Rotor-Bearing system 2nd

Three-Dimensional Solid Shaft Super-Element Transfer Matrix ...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Fu, Jiangtao Wang, Jinghong He, Bin Xie, Kai Feng, Yu 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 harmonic response calculation of rotor system is an important part of the analysis and design of rotating machinery, which has attracted the attention of engineers and designers. This study focuses on the problem that the single harmonic response of the full-order finite element model is computationally intensive and it is not easy to quickly obtain the harmonic response map of the system. Firstly, the full-order finite element dynamic model of three-dimensional isotropic solid shaft is established, and the super-element is generated by CB modal synthesis method. Based on the idea of transfer matrix method, the transfer equation and transfer matrix of solid shaft super-element for steady-state response analysis of rotor system are derived, and the transfer matrix method of solid shaft super-element for steady-state response analysis of isotropic rotor system is formed. Taking the harmonic response calculation of a typical isotropic solid rotor system as an example, the results show that under the premise of ensuring the calculation accuracy, the super-element transfer matrix method of the proposed CB modal synthesis method can greatly improve the calculation efficiency and shorten the calculation time while giving full play to the low calculation scale of the transfer matrix method, which provides an efficient analysis theory and method for the harmonic response calculation of isotropic rotor system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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A Parallel Algorithm for the Natural Frequency of Chain systems on CPU-GPU Heterogeneous Computing systems 2nd

A Parallel Algorithm for the Natural Frequency of Chain Syst...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Peng, Yijia Rui, Xiaoting Wang, Guoping 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

The multibody system transfer matrix method (MSTMM) is a novel dynamic approach which avoids global dynamics equations with a system inertia matrix, utilizes low‐order matrices independent of system degree of freedom, and is highly stylized. With the increase of the number of elements, the time to compute the natural frequency of chain system with the multibody system transfer matrix method is increasing. In order to improve the computational efficiency of the algorithm, an effective way is to parallelize the algorithm. The existing parallel algorithms of using the MSTMM to compute the natural frequency of multibody systems are based on CPU parallel computation, which cannot utilize the GPU of computer, resulting in a waste of computing resources. Therefore, this paper proposes a parallel algorithm for computing the natural frequency of chain systems in CPU-GPU heterogeneous environment. The CUDA parallel computing model is utilized to leverage the computational power of GPUs, while the MPI parallel computing model enables efficient communication and coordination between CPUs and GPUs. The results show that the proposed algorithm is effective, achieving an acceleration ratio 4 times higher than the existing parallel algorithms under the same hardware condition. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Graphics processing unit

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Study on the Reduced Multibody system Transfer Matrix Method of Spatial Curved Beams with Large Motion 2nd

Study on the Reduced Multibody System Transfer Matrix Method...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhang, Xizhe Rui, Xiaoting Zhang, Jianshu Gu, Junjie Zhang, Lina 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 reduced multibody system transfer matrix method (RMSTMM) has a number of advantages over conventional dynamics methods in that there is no need to establish the global dynamics equations with a system inertia matrix, low order of the matrices and high numerical stability. Previous dynamics models for spatial curved beams with large motion and small deformation built by RMSTMM ignored the nonlinear terms in the relationship between strain and deformation, which led to computational divergence in some cases. In this paper, the foreshortening effect of the curved beam is considered and the floating frame method is used to give a more accurate description of the deformation of the nodes. The modal synthesis method is adopted in order to reduce the order of the dynamic equations of the spatial curved beam and the reduced multibody system transfer equations for spatial curved beams with the geometrical nonlinearity is developed which extends the application of the RMSTMM. The numerical example is compared with ABAQUS software to demonstrate the proposed approach. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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