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THE PROGRESS OF RESEARCH ON DYNAMICS OF BIRKHOFF'S SYSTEM

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-166

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This paper presents the frame of fundamental theory of a new mechanic——dynamics of Birkhoff′s system. It cites the research results in recent years. It outlines the future directions of research.

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-184

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In this paper, the advances in spillover problems in the control for the flexible structures are summarized. First, the spillover mechanism and its effect on the system is analyzed, and some main factors, which affect the spillover, are derived. Then, based these factors, various methods for spillover suppression are surveyed. Finally, the trends of this direction are discussed in this paper. 

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-185

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 The achievement of research on dynamics and control of space manipulator in recent years is presented in this paper. The current status and development on problems of the inverse dynamics of path planning, flexible influence, adaptive and optimal control and workspace are summarized. 

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-186

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The recent years have seen exciting advances in the application of finite element techniques to the solution of biomechanic. Nowhere is this more apparent than in studies of embryo morphogenesis, where computer simulations have made significant breakthroughs in our understanding. The purpose of this paper is to outline some recent achievements in computer modelling of neurulation gastrulation. cardiac looping and cell mechanics and to take a brief look on the future of computer modelling.

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-187

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Adaptive FEM is a numerical scheme which can automatically adjust algorithms to improve the solving procedure. Based on the ordinary FEM, the key techniques of it includes the error estimation, adaptive refinement, etc. The paper presents a brief review for the advanced improvement and applications of adaptive FEM. 

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-188

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 Recent advances in collective behaviour of short fatigue cracks are surveyed and discussed, including experiments for collective behaviour of short fatigue cracks, analyses of crack number density, statistical methods, and simulations for development of short cracks.

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-189

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The interface is the separatrix between two media.It is only as an extreme in the model descriptions to be regarded as beingbilateral. There are many cases in which its another extreme, i.e., thesocalled unilateral model may possibly be more close to the reality.The propagation of elastic wave under unilateral interface are still not sufficiently investigated. It is the purpose ofthis paper to present a review on the current situations,problems and prospects in this research sphere.

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-190

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Development of research on the system of multipleimmiscible fluid layers, especially in the application of a spacecrystalgrowth process technique, is reviewed briefly. This paperdescribes the phenomena of fluid convection and heat transfer ina multilayer fluid system, and presents the results of theoreticalanalyses, experimental research and numerical simulation on the naturalconvection and thermocapillary convection in a fluid with two or threelayers.The features of hydrodynamic control of the melt enc...

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-191

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Dynamic thermalhydraulic lumped, distributed modelsand its various forms for singlephase heated tubes are summarized for power plant boiler and other heating power equipmentdynamic characteristic analysis and realtime simulation with theircharacteristic, simplified forms. Problems for further research are pointed out at theend of this paper.

1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-192

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1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-193

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1997, 27(4): . doi:10.6052/1000-0992-1997-4-J1998-194

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1997, 27(4): 433-435. doi:10.6052/1000-0992-1997-4-J1998-183

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1997 Vol. 27, No. 4

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