力学进展

DEVELOPMENT OF MODERN THEORY OF NONLINEAR DYNAMICAL SYSTEMS WITH PARAMETRIC EXCITATIONS

1998, 28(1): 1-16. doi: 10.6052/1000-0992-1998-1-J1998-118

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In this paper we summarize the recent research situation and research methods for responses, bifurcations and chaos of nonlinear dynamical systems with parametric excitations. We discuss the recent problems and the tendency of development of these nonlinear dynamical systems with parametric excitations.

DEVELOPMENTS IN THE STUDIES OF STABILITY OF NONHOLONOMIC SYSTEMS

1998, 28(1): 17-29. doi: 10.6052/1000-0992-1998-1-J1998-119

Abstract(2122)

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This paper reviews developments in the study of stability of nonholonomic systems, including the stability of the equilibrium state with respect to all variables, the equilibrium manifold and the stationary motions, partial stability and the stabilization of nonholonomic control systems. Moreover, several important applications of the stability of nonholonomic systems are discussed , and some proposals for the study in the future are made.

ADVANCES AND TRENDS OF NONLINEAR DYNAMICS OF PIPES CONVEYING FLUID

1998, 28(1): 30-42. doi: 10.6052/1000-0992-1998-1-J1998-120

Abstract(2325)

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Some recent advances in nonlinear dynamics of pipes conveying fluid are reviewed in this paper. It focuses concentrates on nonlinear equations of motion, modern analytical method for solving such nonlinear equations, and dynamic behaviors of pipes conveying fluid with steady or unsteady flow velocity including bifurcation phenomenon and chaotic motion. Finally, the promising future development in this area is discussed.

THE MECHANICAL THEORY OF THE MICROCRACK SHIELDING MECHANISM

1998, 28(1): 43-57. doi: 10.6052/1000-0992-1998-1-J1998-121

Abstract(2326)

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This paper deals with the mechanical theory of the microcrack shielding mechanism and its major conclusions. The validity and the applicable regions are determined for the four assumptions used in two techniques in the investigation of the theory. The controversies among the previous researches are discussed. The conclusions derived by the present authors are introduced and the extensions to those for composite materials and bimaterials are treated.

REPORT OF RANDOM TEMPERATURE AND RANDOM CREEP STRESS IN MASS CONCRETE STRUCTURES

1998, 28(1): 58-70. doi: 10.6052/1000-0992-1998-1-J1998-122

Abstract(2013)

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Research of random temperature and ramdon creep stress in mass concrete structures is becoming more and more important for practical engineering. This paper discusses random environmental factors, random physical parameters, random hydration heat of concrete as well as the properties of concrete aging and creep etc., and reviews systematically various methods for the analysis of random temperature and random creep stress of concrete structures. The suitability of those methods and the key problems needed...

ADVANCES IN HYBRID TREFFTZ FINITE ELEMENT METHOD

1998, 28(1): 71-82. doi: 10.6052/1000-0992-1998-1-J1998-123

Abstract(1789)

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The paper surveys exiting HT element formulation and its applications in elasticity and heat conduction. The T elements may be used to generate highly accurate h and p extension elements, which exhibit many important advantages over the conventional ones. The applications cover fields like plane elasticity, thin and thick plates, thin shells, poisson′s equation, axisymmetric 3 D elasticity, postbuckling behavior of thin plate and transient heat conduction analysis. Future trends in the ...

REVIEW OF WAVE PROPAGATION THEORY IN SATURATED AND UNSATURATED POROUS MEDIUM AND ITS NUMERICAL METHODS

1998, 28(1): 83-92. doi: 10.6052/1000-0992-1998-1-J1998-124

Abstract(1868)

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This paper gives a brief review of wave propagation theory in saturated and unsaturated porous medium. Some advances in numerical methods of wave propagation in saturated porous medium with emphasis on the finite element methods are presented. Finally, some problems requiring future study are discussed.

THE RESEARCH OF DISPERSION SYSTEMS UNDER MICROGRAVITY CONDITIONS

1998, 28(1): 93-100. doi: 10.6052/1000-0992-1998-1-J1998-125

Abstract(1999)

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Possible influences of the gravity on dispersions system and the use of microgravity condition as a research tool for the investigation of dispersions systems are discussed and analyzed. Actual ongoing theoretical research and industrial applications are discussed as well.

APPLICATION OF FRACTAL IN PETROLEUM ENGINEERING

1998, 28(1): 101-110. doi: 10.6052/1000-0992-1998-1-J1998-126

Abstract(1769)

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The fractal used in analysis of well test data has provided a new tool of reservoir description, which makes it easy to simulate complex reservoir by numerical simulator; fractal can be used to solved some difficult questions in transient pressure analysis; when used to describe fracture and pore it can improve the technique of matrix acidizing and hydraulic fracturing; more information about fingering may be revealed by using fractal to describe multiphase flow. In brief, the development of the basic ...

PARALLEL COMPUTERS AND PARALLEL ALGORITHMS FOR CFD

1998, 28(1): 111-135. doi: 10.6052/1000-0992-1998-1-J1998-127

Abstract(2321)

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This text presents a tutorial on those aspects of parallel computing that are important for the development of efficient parallel algorithms and software for Computational Fluid Dynamics (CFD). We first review the main architectural features of parallel computers and we briefly describe some parallel systems on the market today. We introduce some important concepts concerning the development and the performance evaluation of parallel algorithms. We discuss how work load imbalance and communication costs o...

ADVANCES IN MECHANICS

1998, 28(1): 136-136. doi: 10.6052/1000-0992-1998-1-J1998-128

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ADVANCES IN MECHANICS

1998, 28(1): 140-141. doi: 10.6052/1000-0992-1998-1-J1998-129

Abstract(1503)

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ADVANCES IN MECHANICS

1998, 28(1): 142-142. doi: 10.6052/1000-0992-1998-1-J1998-130

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1998 Vol. 28, No. 1

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