检索结果-南通市图书馆

Modeling simulation and experiment of micro-Doppler signature of precession

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第4期21卷 544-549页

作者： hongwei gao Lianggui Xie Shuliang Wen Beijing Institute of Radio Measurement Beijing 100039 R R. China China Aerospace Science & Industry Corporation Beijing 100048 P. R. China

Spatial precession is a special micro-motion of the spinning-directional target, and the micro-Doppler signature of the cone-shaped target with precession is studied. The micro-motion model of precession is built first, and then the micro-Doppler model is developed based on the proposed concept of micro-motion ma- trix, by which the theoretical formula of micro-Doppler signature of precession is derived. In order to further approach to the actual case, the occlusion effect is firstly considered in micro-Doppler, and the simulated result with occlusion effect is well in accordance with the measured result in microwave anechoic chamber, which suggests that the micro-motion model and micro-Doppler model of precession are both valid.

关键词： precession micro-Doppler micro-motion matrix occlusion effect.

A 3-DOF Pseudo-Rigid-Body Model for Tension-Based Compliant Bistable Mechanisms

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2010年第2期23卷 149-153页

作者： CHEN Guimin gao hongwei JIA Jianyuan School of Mechatronics Xidian University Xi ＇an 710071 China

Compliant bistable mechanisms, devices with two distinct stable equilibrium positions, are used in a variety of applications, such as switches, clasps, and valves. Many kinds of compliant bistable mechanisms were proposed and studied during the past decade. Among them, tension-based compliant bistable mechanisms, that incorporate tension pivots as their flexible members, feature in short travel distance and low power consuming. So far, the design of this kind of bistable mechanisms is done using finite element method through trial and error, thus is time-consuming. By treating the tension pivots as fixed-guided segments and their elongation as a spring, we developed a novel three degree-of-freedom （3-DOF） pseudo-rigid-body model （PRBM） for this kind of bistable mechanisms. The principle of virtual work is used to derive the force-deflection relationship of the PRBM model. The comparison between the PRBM results and the experimental results of the force-deflection characteristics shows that the PRBM can predict not only the bistable behavior of the tension-based bistable mechanisms, but also their soft spring-like post-bistable behavior and the spring-like force-deflection characteristics when pulling in the reverse direction from the as-fabricated position, which is called reverse behavior. The 3-DOF PRBM can be used to design and identify tension-based bistable mechanisms. Using the PRBM instead of the trial-and-error method can greatly reduce the development time of this kind of bistable mechanisms.

关键词： compliant bistable mechanism pseudo-rigid-body model tension pivot

Cooperation in Two-Stage Games on Undirected Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2017年第3期30卷 680-693页

作者： gao hongwei PETROSYAN Leon QIAO Han SEDAKOV Artem School of Mathematics and Statistics Qingdao UniversityQingdao 266071China. Faculty of Applied Mathematics and Control Processes Saint Petersburg State UniversitySaint Petersburg 198504Russia School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China

In the paper, cooperative two-stage network games are studied. At the first stage of the game, players form a network, while at the second stage players choose their behaviors according to the network realized at the first stage. As a cooperative solution concept in the game, the core is *** is proved that some imputations from the core are time inconsistent, whereas one can design for them a time-consistent imputation distribution procedure. Moreover, the strong time consistency problem is also investigated.

关键词： Characteristic function cooperation core imputation imputation distribution proce-dure network strong time consistency T-value.

Solar Flux Measuring and Optical Efficiency Forecasting of the Linear Fresnel Reflector Concentrator after Dust Accumulation

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第3期31卷 663-677页

作者： ZHAO Xiaoyan YAN Suying ZHANG Na ZHAO Ning gao hongwei College of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The linear Fresnel reflector concentrator(LFRC)is widely used in the field of solar energy utilization due to its simple structure,low cost,and excellent wind ***,the LFRC operates outdoors all year round,and the dust accumulation on the mirror will reduce the optical efficiency of the system,so it needs to be perfected and *** this paper,a focal plane energy flux experimental device was designed to test the energy flux of the system under different dust accumulation *** results indicate that,the dust density on the mirror increased and the energy flux on the focal plane decreased with increase of dust accumulation *** undergoing dust accumulation for 35 days,the dust density on the mirror reached 4.33 g/m^(2)and the average energy flux on the focal plane decreased to 1.78 kW/m^(2).Additionally,the variation of reflectivity caused by dust accumulation on mirror was taken as the quantitative index,and a prediction model for the impact of dust on the optical efficiency of the system was *** results will provide guidance for improving the optical efficiency of the LFRC.

关键词： dust accumulation energy flux linear Fresnel reflector concentrator optical efficiency forecast

A Class of General Transformation of Characteristic Functions in Dynamic Games

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第6期33卷 1997-2012页

作者： LIU Cui gao hongwei PETROSIAN Ovanes LIU Ying WANG Lei School of Mathematics and Statistics Qingdao UniversityQingdao 266071China School of Mathematics and Statistics Institute of Applied Mathematics of ShandongQingdao UniversityQingdao 266071China Faculty of Applied Mathematics and Control Processes Saint Petersburg State UniversitySaint Petersburg 198504Russia School of Automation Qingdao UniversityQingdao 266071China

The transformation of characteristic functions is an effective way to avoid time-inconsistency of cooperative solutions in dynamic *** are several forms on the transformation of characteristic *** this paper,a class of general transformation of characteristic functions is *** can lead to the time-consistency of cooperative solutions and guarantee that the irrational-behaviorproof conditions hold *** illustrate the theory,an example of dynamic game on a tree is given.

关键词： Dynamic cooperative game general transformation of characteristic function irrational-behavior-proof condition time-consistency

Integrating Krylov Deferred Correction and Generalized Finite Difference Methods for Dynamic Simulations of Wave Propagation Phenomena in Long-Time Intervals

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2021年第6期13卷 1398-1417页

作者： Wenzhen Qu hongwei gao Yan Gu School of Mathematics and Statistics Qingdao UniversityQingdaoShandong 266071China Institute of Mechanics for Multifunctional Materials and Structures Qingdao UniversityQingdaoShandong 266071China

In this paper,a high-accuracy numerical scheme is developed for long-time dynamic simulations of 2D and 3D wave propagation *** the derivation of the present approach,the second order time derivative of the physical quantity in the wave equation is treated as a substitution *** on the temporal discretization with the Krylov deferred correction(KDC)technique,the original wave problem is then converted into the modified Helmholtz *** transformed boundary value problem(BVP)in space is efficiently simulated by using the meshless generalized finite difference method(GFDM)with Taylor series after truncating the second and fourth order *** developed scheme is finally verified by four numerical experiments including cases with complicated domains or the temporally piecewise defined source *** results match with the analytical solutions and results by the COMSOL software,which demonstrates that the developed KDC-GFDM can allow large time-step sizes for wave propagation problems in longtime intervals.

关键词： Wave equation Krylov deferred correction technique large time-step long-time simulation,generalized finite difference method

Efficient Computation of Scattering from Targets with Negative Impedance Surface

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2017年第1期26卷 90-94页

作者： Jingwei Hao hongwei gao Xinqing Sheng School of Information and Electronics Beijing Institute of Technology Beijing 100081 China

Current surface integral equations used for computing scattering from targets with negative impedance boundary condition（IBC）are not efficient.A modified surface dual integral equation（M-SDIE）for targets with negative IBC is presented.A pure imaginary number is used to balance the *** is proved that the M-SDIE is accurate and efficient with three numerical *** first numerical example shows that the M-SDIE is accurate compared with *** second example shows that the presented SIE is *** the third example,a missile head is selected to present the computing power of the *** the examples show that the M-SDIE is an efficient algorithm for negative IBC.

关键词： electromagnetic scattering impedance boundary condition (IBC) method of moments(MoM) surface integral equation

Analysis of Large Slotted-Waveguide Antenna Arrays Using the Parallel DDA-FE-BI-MLFMA

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2017年第1期26卷 84-89页

作者： Xumin Sun Minglin Yang hongwei gao Xinqing Sheng Center for Electromagnetic Simulation School of Information and Electronics Beijing Institute of Technology Beijing 100081 China

An efficient analyzing approach is presented for large slotted-waveguide antenna arrays by using hybrid finite element-boundary integral-multilevel fast multipole algorithm（FE-BI-MLFMA）in this paper.A simple computation model for slotted-waveguide antenna is presented by using thin current probe excitation and perfectly matched layer（PML）*** each slotted-waveguide antenna can be considered as a single sub-domain,the domain decomposition algorithm（DDA）can be applied to FE-BI-MLFMA to greatly reduce the computation resources and achieve high *** DDA-FE-BI-MLMFA is parallelized to further strength its *** comparisons of the computed radiation patterns with measured data and results from the commercial software show that our method has good accuracy for slottedwaveguide *** the influence of mutual coupling between adjacent slotted-waveguides is *** demonstrate capability of the presented method,a carefully designed large X-band slotted-waveguide antenna array containing eighteen waveguides with Taylor amplitude and inverse phase excitation distribution are analyzed in the paper.

关键词： large slotted-waveguide antenna array perfectly matched layer domain decompositionalgorithm parallel FE-BI-MLFMA

Strategically supported cooperation in dynamic games with coalition structures

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2016年第5期59卷 1015-1028页

作者： WANG Lei gao hongwei PETROSYAN Leon QIAO Han SEDAKOV Artem School of Mathematics and Statistics Qingdao University Qingdao 266071 China institute of Applied Mathematics of Shandong Qingdao 266071 China Faculty of Applied Mathematics and Control Processes Saint Petersburg State University Saint Petersburg 198504 Russia School of Economics and Management University of Chinese Academy of Sciences Beijing 100190 China

The problem of strategic stability of long-range cooperative agreements in dynamic games with coalition structures is investigated. Based on imputation distribution procedures, a general theoretical framework of the differential game with a coalition structure is proposed. A few assumptions about the deviation instant for a coalition are made concerning the behavior of a group of many individuals in certain dynamic *** these, the time-consistent cooperative agreement can be strategically supported by ε-Nash or strong ε-Nash equilibria. While in games in the extensive form with perfect information, it is somewhat surprising that without the assumptions of deviation instant for a coalition, Nash or strong Nash equilibria can be constructed.

关键词： cooperative game theory coalition structure strategic stability imputation distribution procedure deviation instant ε-Nash equilibrium strong ε-Nash equilibrium