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检索条件"机构=Science and Technology on Complex System Simulation Laboratory"

共 2021 条记录，以下是121-130 订阅

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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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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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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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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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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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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...

引用

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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FE–BE Couple Method of 3D Electromagnetic Launch Dynamics Analysis 2nd

FE–BE Couple Method of 3D Electromagnetic Launch Dynamics A...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Wang, Jiawei He, Bin Yu, Hailong Wu, Nan 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

Railgun is one of the representatives of future launch technology, its dynamic simulation and design are key issues in engineering research. In order to solve the electromagnetic field evolution calculation problem during the dynamic launch process, based on the Maxwell equations of the quasi-static field, the governing equation of the three-dimensional transient eddy current field is derived with the vector potential A and the scalar potential φ as state variables. The solution domain and its surface are discretized using the FEM and the BEM, respectively. Solve the simultaneous FE and BE dynamic equations using the implicit difference scheme. Develop a transient dynamics solver for electromagnetic railguns to obtain the parameters such as current density, magnetic induction, and Lorentz force in the time domain. This method has been verified by commercial software, without to establish air domain grids, and has high calculation accuracy, which provides theoretical and technical support for the dynamic design of electromagnetic railguns. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Maxwell equations

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An Integrated Design Method Combined Electromagnetic Field and Damping Force for Magnetorheological Dampers 2nd

An Integrated Design Method Combined Electromagnetic Field a...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Wei, Min Rui, Xiaoting 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 magnetorheological damper has advantages of high damping force, low energy consumption, rapid response, and fail-safe safety. It has shown great potential for application in various fields such as vehicles, machinery, construction, and medical industries. In order to improve the design efficiency, this paper proposes an integrated design method combined electromagnetic field and damping force for magnetorheological dampers. A linear magnetorheological damper is introduced. By introducing the coil space parameters, the original coil design is transformed into coil geometric space design. The damping force model considering the coil space parameters is established. The electromagnetic analysis model considering the coil space parameters is derived. Furtherly, the influence of coil space parameters on structural design and magnetic field design is analysed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Electromagnetic fields

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Steady-State Response Analysis of Double-Beam system Based on the Reduced Multibody system Transfer Matrix Method 2nd

Steady-State Response Analysis of Double-Beam System Based o...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Liu, Zhengquan Wang, Guoping Rui, Xiaoting Hu, Shaoheng 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

Double-beam systems are widely used in modeling and analyzing engineering structures. Accurately determining their steady-state response is crucial for structural design and stability analysis. The steady-state response of double-beam systems, connected by multiple discrete elastic supports, is analyzed using the linear reduced multibody system transfer matrix method. The double-beam segments and the elastic supports are considered as independent elements. The reduced transfer equations for the root marker are directly derived from the basic equations of the elastic support element. The explanation is provided on how the reduced transfer equations for the root marker of double-beam elements are derived from the transfer equations of a single beam element. Through the linear RMSTMM, boundary value problems are addressed in a recursive process, bypassing the need for successive multiplication of transfer matrices, thereby enhancing computational stability. Finally, a numerical calculation of the steady-state response of the double-beam system is carried out. This paper introduces a novel and effective method for the analysis of the steady-state response of double-beam systems. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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