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On stabilization of the cbs algorithm: Internal and external time steps

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2000年第6期48卷 875-880页

作者： Nithiarasu, P Zienkiewicz, OC Univ Wales Swansea Inst Numer Methods Engn Swansea SA2 8PP W Glam Wales

The use of stabilization techniques for incompressibility and convective acceleration is currently an active area of research in the finite element analysis. A related issue on the topic of stabilization is addressed in this paper. The procedure discussed here is demonstrated using the cbs algorithm for Stokes flow in a lid-driven cavity. Copyright (C) 2000 John Wiley & Sons, Ltd.

关键词： cbs algorithm incompressibility stabilization finite elements

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Characteristic-based split (cbs) algorithm finite element modelling for shallow waters in the Venice lagoon

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2006年第10期66卷 1641-1657页

作者： Morandi-Cecchi, M. Venturin, M. Univ Padua Dipartimento Matemat Pura & Applicata I-35131 Padua Italy

In this paper, the characteristic-based split (cbs) algorithm is presented to solve water motion problem due to tides in the Venice lagoon. The basic equations are the well-known vertically integrated shallow-water equations expressed in terms of total water depth and horizontal velocities. The approximation of any additional scalar variables, such as temperature, concentration or pollutant dispersion from the appropriate advection-diffusion governing equations is also outlined. Numerical results illustrate the performance of the proposed algorithm on both advection-diffusion and shallow-water problems. Copyright (c) 2006 John Wiley & Sons, Ltd.

关键词： shallow-water equations shallow-water problems cbs algorithm fluid dynamics finite element method

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On boundary conditions of the characteristic based split (cbs) algorithm for fluid dynamics

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2002年第4期54卷 523-536页

作者： Nithiarasu, P Univ Coll Swansea Dept Civil Engn Inst Numer Methods Engn Swansea SA2 8PP W Glam Wales

This paper discusses alternative procedures which can be used in the application of boundary conditions for the cbs algorithm. Attention is focused on the problem of application of prescribed velocity and traction conditions. The paper is illustrated with some incompressible flow problems. Although previously logical and correct boundary condition specifications were introduced, the procedures outlined in this paper simplify calculations and generally make it more accurate. Copyright (C) 2002 John Wiley Sons, Ltd.

关键词： boundary conditions cbs algorithm fluid dynamics finite elements

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Method of Multi-agent Path Planning for Lunar Robots Swarm Based on Improved cbs algorithm

Method of Multi-agent Path Planning for Lunar Robots Swarm B...

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第43届中国控制会议

作者： Haolong Feng Songtai Wu Shengyang Liu Ting Song Fei Han Shanghai Aerospace Control Technology Institute Shanghai Key Laboratory of Aerospace Intelligent Control Technology Northwestern Polytechnical University

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

As lunar missions become increasingly complex, the mission terrain will vary depending on different operating *** the future, there may be multiple lunar rovers working together, a more flexible and efficient algorithm to generate mission paths for lunar rover clusters is required. To address the path planning problem of lunar rover groups in large-scale and complex lunar terrain, this paper constructs a gridded map based on lunar image information and the actual lunar surface image is woven into a ring map. Path planning algorithms are modeled on this map, and the actual paths are projected onto the original lunar surface and into missions for implementing multi-lunar rover path planning tasks based on the conflict based search(cbs)algorithm. As the key to cbs algorithm is to resolve conflicts among agents, this paper combines the Deep Q Network with the cbs algorithm to propose a cbs algorithm based on a DQN conflict choice strategy to solve the multi-agent path planning problem for lunar rover clusters. The DQN can learn the policy of an agent, enabling it to better select paths. By integrating DQN with the cbs algorithm, path planning can become more intelligent and efficient. Finally, the simulation verifies that the cbs algorithm can effectively solve the multi-agent path planning problem and the improved cbs algorithm proposed has a certain degree of improvement in terms of solution efficiency.

关键词： lunar robots swarm multi-agent systems path planning cbs algorithm

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Achievements and some unsolved problems of the finite element method

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2000年第1-3期47卷 9-28页

作者： Zienkiwicz, OC Univ Coll Swansea Dept Civil Engn Inst Numer Methods Engn Swansea SA2 8PP W Glam Wales

After outlining the early history of the finite element method the paper concentrates on to (1) some important achievements of the last decade and (2) presents an outline of some problems still requiring treatement. In the first part, the developments of the patch test for assessment of elements, new developments of adaptive refinement and the principles of the general cbs algorithm for fluid dynamics are presented. Copyright (C) 2000 John Wiley & Sons, Ltd.

关键词： finite element method patch test adaptive refinement cbs algorithm fluid dynamics

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Multi-antenna Compressed Wideband Spectrum Sensing for Cognitive Radio

Multi-antenna Compressed Wideband Spectrum Sensing for Cogni...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Yang, Xianjun Cui, Qimei Yang, Rui Tao, Xiaofeng Guo, Xin Beijing Univ Posts & Telecommun Wireless Technol Innovat Inst Key Lab Universal Wireless Commun Minist Educ Beijing 100088 Peoples R China Sony China Res Lab Beijing Peoples R China

ISBN: (纸本)9781612842547

This paper proposes a novel wideband spectrum sensing (WSS) scheme, termed multi-antenna compressed wideband spectrum sensing (MCWSS) scheme, which utilizes compressed sensing (CS) to reduce the extremely high sampling rate of wideband signal. Although there are studies on compressed wideband spectrum sensing, they only focus on single antenna signal. Since multi-antenna technology can enhance the detection performance, this paper investigates the multi-antenna scenario. However, existing CS recovery algorithms are designed only for single antenna signal and are not suitable for recovering multi-antenna signals. Therefore, the paper proposes two novel CS recovery algorithms from different angles, namely CRL2 (combining relevance via L-2 norm) algorithm and cbs (combining before sampling) algorithm. The CRL2 algorithm jointly recovers the multi-antenna signals and performs better than single antenna scenario. Whereas, cbs algorithm can significantly improves the recovery performance with an additional analog combining operation. Since existing WSS algorithms are too complicated, we devise a novel WSS algorithm, i.e. DA (divided-averaged) algorithm, which has good performance with low complexity. Simulation results show that the MCWSS scheme performs well at low sampling rate.

关键词： algorithm design and analysis Antennas cbs algorithm CRL2 algorithm CS recovery algorithms DA algorithm MCWSS scheme Sensors Signal to noise ratio Simulation Wideband antenna arrays cognitive radio cognitive radio combining before sampling algorithm divided-averaged algorithm multiantenna compressed wideband spectrum sensing single antenna signal

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The characteristic-based-split procedure:: An efficient and accurate algorithm for fluid problems

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS 1999年第1期31卷 359-+页

作者： Zienkiewicz, OC Nithiarasu, P Codina, R Vázquez, M Ortiz, P Univ Wales Swansea Dept Civil Engn Inst Numer Methods Engn Swansea SA2 8PP W Glam Wales Univ Politecn Catalunya Int Ctr Numer Methods Engn Barcelona Spain Ctr Estudios Tecn Aplicadas E-28014 Madrid Spain

In 1995 the two senior authors of the present paper introduced a new algorithm designed to replace the Taylor-Galerkin (or Lax-Wendroff) methods, used by them so far in the solution of compressible flow problems. The new algorithm was applicable to a wide variety of situations, including fully incompressible flows and shallow water equations, as well as supersonic and hypersonic situations, and has proved to be always at least as accurate as other algorithms currently used. The algorithm is based on the solution of conservation equations of fluid mechanics to avoid any possibility of spurious solutions that may otherwise result. The main aspect of the procedure is to split the equations into two parts, (I) a part that is a set of simple scalar equations of convective-diffusion type for which it is well known that the characteristic Galerkin procedure yields an optimal solution;and (2) the part where the equations are self-adjoint and therefore discretized optimally by the Galerkin procedure. It is possible to solve both the first and second parts of the system explicitly, retaining there the time step limitations of the Taylor-Galerkin procedure. But it is also possible to use semi-implicit processes where in the first part we use a much bigger time step generally governed by the Peclet number of the system while the second part is solved implicitly and is unconditionally stable. It turns out that the characteristic-based-split (cbs) process allows equal interpolation to be used for all system variables without difficulties when the incompressible or nearly incompressible stage is reached. It is hoped that the paper will help to make the algorithm more widely available and understood by the profession and that its advantages can be widely realised. Copyright (C) 1999 John Wiley & Sons, Ltd.

关键词： cbs algorithm fluid problems convective-diffusion-type

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ZigBee-Based Architecture Design of Imperceptible Smart Home System

ZigBee-Based Architecture Design of Imperceptible Smart Home...

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作者： Juanli Kuang Lang Li College of Computer Science and Technology Hengyang Normal University

The smart home has been an emerging industry which combines wireless sensor technology and computer *** order to meet the current requirements of "automation,comfortableness,energy-saving and safety" in intelligent home life,we introduce the conception of imperceptibility into smart home system and design the architecture model based on ZigBee's imperceptible smart home system which based on the ZigBee protocol and the basic architecture of 'Sea-Net-Cloud'.The ‘Sea' means that has a huge number of terminal applications and we design it by combining perception terminal and mobile terminal in this *** ‘Net' is a data transmission channel and this paper focuses on imperceptible network scheme based on ***‘Cloud' is for cloud data ***' data are processed through cbs algorithm of private cloud to gradually optimize the users' habits model and the system could adjust itself according to the users' habits to provide service initiatively and make smart home finally smart.

关键词： Smart home ZigBee Imperception cbs algorithm

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NUMERICAL BIFURCATION ANALYSIS OF STATIC AND DYNAMIC STALLS OF AIRRFOIL

NUMERICAL BIFURCATION ANALYSIS OF STATIC AND DYNAMIC STALLS ...

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The Third International Conference on Dynamics, Vibration and Control

作者： J.Z.Zhang,K.L.Li School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China

The stall-incidence of the airfoil is an important parameter for the characteristics of aerodynamics,and large-scale flow separation of the static stall on the airfoil surface could cause sharp drop of lift coefficient and sudden increase of drag *** this phenomenon can be delayed effectively by the dynamic stall caused by the unsteady *** stall incidence of the airfoil can increase lift and reduce drag *** an unsteady aerodynamic behavior of high angle of attack,there exists a rich variety of nonlinear phenomena,which should be investigated from viewpoint of nonlinear *** explicit characteristic based split scheme(cbs) is presented in the study to approach incompressible Navier-Stokes equations without turbulent *** flows around a stationary and a sinusoidally pitching airfoil are carried out to simulate static stall and dynamic stall behavior,***,the natures of the static stall of airfoil are studied based on bifurcation theories.

关键词： Arodynamics Static stall Dynamic stall cbs algorithm Saddle-node bifurcation Fixed-point bifurcation

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