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1996 Vol. 26, No. 4

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RAPIDLY DEVELOPING NON-LINEAR MECHANICS OF CONTINUOUS MEDIA
1996, 26(4): 433-436. doi: 10.6052/1000-0992-1996-4-J1996-040
Abstract(1710) PDF(752)
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1996, 26(4): 437-452. doi: 10.6052/1000-0992-1996-4-J1996-041
Abstract(2243) PDF(2171)
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Stochastic bifurcation---noise induced transition is a special nonlinear complicated phenomehon which is different from deterministic bifurcations and general chaos. In this paper, a comprehensiye review of the history, elementary ideas and main results of the studies on stability problem, exit problem,bifurcation behavior and dynamical theory of nonlinear stochastic system is presented.
ACTIVE CONTROL OF CHAOS OF MECHANICAL SYSTEMS
1996, 26(4): 453-463. doi: 10.6052/1000-0992-1996-4-J1996-042
Abstract(1517) PDF(848)
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Controlling chaos is a new research field focusing on the application to nonlinear science in engineering. This paper begins with surveying various strategies of controlling chaos of mechanical systems. Then, it presents key problems in experiments and outlines successful paradigms. The paper finally addresses a number of open problems in the field.
THE ADVANCES OF MODAL THEORY
1996, 26(4): 464-472. doi: 10.6052/1000-0992-1996-4-J1996-043
Abstract(2071) PDF(1591)
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in recent years the classic modal theory for linear dynamic systems is in a continuous development and has also been extended to nonlinear structural vibrating systems and strain/stress field vibration analysis. Many important results have been obtained. This paper gives a brief review on the research on displacement real, complex and generalized modal theories of linear vibrating systems, nonlinear modal analysis of structural vibrating systems, strain/stress modal analysis. A list of references is present...
1996, 26(4): 473-481. doi: 10.6052/1000-0992-1996-4-J1996-044
Abstract(1555) PDF(964)
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A review on the experimental studies of dynamical behavior of nonlinear oscillating systems in recent years is given. The emphasis is laid on mechanical model experiments. Analysis methods for dealing with experimenta-ldata are discussed in detail. Finally, some suggestions arc given to the future studies on nonlinear vibration experiments.
SEEPAGE FLOW AND MOVEMENT OF CONTAMINANTS IN KARSTIFIED CARBONATE ROCKS
1996, 26(4): 482-492. doi: 10.6052/1000-0992-1996-4-J1996-045
Abstract(1533) PDF(696)
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in this paper, the dynamic flow systems and transport of contaminants in karstic aquifers are presented. Some conclusions are reached from the analysis of physical and chemical processes involving aqueous systems containing certain contaminants, Pertinent mathematical and chemical equations for these complicated processes are discussed. Contaminant transport in Karstic aquifers can be mathematically expressed by the basic equations evaluated primarily for the flow in porous, highly permeable aquifers. The e...
SOME INVERSE PROBLEMS IN SHIP HYDRODYNAMICS
1996, 26(4): 493-499. doi: 10.6052/1000-0992-1996-4-J1996-046
Abstract(1825) PDF(979)
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in ship hydrodynamics, the determination of performances (such asresistance, motion characteristics etc.) of a given ohject or the flow field around the object under various running conditions and environmental conditions is known as the direct problem. On the contrary, in some case, we will have to find a suitable object having given performances or given flow field characteristics, which is the so called the inverse problem.The aim of the present paper is to make some comments on the special features and ...
A REVIEW OF RESEARCH ON FATIGUE RELIABILITY OF STRUCTURAL SYSTEMS
1996, 26(4): 500-509. doi: 10.6052/1000-0992-1996-4-J1996-047
Abstract(1939) PDF(1106)
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Due to the effect of a large amount of uncertainties, fatigue reliability analysis should be used for safety assessment with respect to fatigue of structures. For large complex structures such as offshore platforms, fatigue reliability should be studied from a view point of the overall structural system.The progress and the state of the art of the research on fatigue reliability of structural systems are reviewed in this paper. Suggestions for further researches are also made.
STUDY ON CONVECTION IN POROUS MEDIA
1996, 26(4): 510-520. doi: 10.6052/1000-0992-1996-4-J1996-048
Abstract(1768) PDF(954)
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The conviction of porous media concerns chiefly with flow of fluid through porous media due to temperature difference. In this paper, the importance of this problem and its development in the last fifty years are reviewed.Particularly, studies on convective oscillatory instability, hifurcation and chaos in the last ten years are discussed.
STUDIES ON THE PROPERTIES OF ELECTRO RHEOLOGICAL FLUID AND ITS APPLICATIONS
1996, 26(4): 521-531. doi: 10.6052/1000-0992-1996-4-J1996-049
Abstract(1920) PDF(1191)
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Electro-Rheological (ER) fluid is a kind of new smart material which is very useful to industrial applications as its mechanical properties canbe changed very quickly and also reversely by applied electric field.In this paper, the research advances in the materials and the characteristics of ER fluid are reviewed at first, the applications of ER fluid to the vibration control of rotating machineries and to the engine mount and suspensionsystem of vehicles are reviewed in detail. The applications of ER fluid...
A REVIEW ON THE MECHANICAL ANALYSIS OF HUMAN HEAD UNDER DIRECT IMPACT
1996, 26(4): 532-540. doi: 10.6052/1000-0992-1996-4-J1996-050
Abstract(1641) PDF(966)
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The present paper gives a historical summary of the mechanical analysis of human head under direct impact in recent years. Three kinds of biomechanical mechanisms of brain injury are introduced and follows a detail review on some ideal models that have been employed in the researches. And the research trends in this field are discussed.
ULTRASONIC TECHNIQUE FOR ELASTIC CONSTANT MEASUREMENT IN COMPOSITE MATERIALS
1996, 26(4): 541-547. doi: 10.6052/1000-0992-1996-4-J1996-051
Abstract(1831) PDF(710)
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This paper reviews tho history of ultrasonic impulse technique in measuring elastic constants of composite materials and describes the present state and basic principles and methods, and offers some comments on the direction of study in the future.
CAE SYSTEM FOR SHEET FORMING
1996, 26(4): 548-557. doi: 10.6052/1000-0992-1996-4-J1996-052
Abstract(1453) PDF(969)
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The sheet forming is complicated due to the simultaneous existence of high order nonlinearities of geometry, materials, contact and friction. A CAE system composed of the finite element simulation and computer graphics can be established to investigate this complicated processes of sheet forming. Useful information can be obtained for the dersign and manufacturing of the sheet forming. The components of the CAB system, the finite element algorithms and the methods for the simulation of contact, friction, dr...
1996, 26(4): 558-558. doi: 10.6052/1000-0992-1996-4-J1996-053
Abstract(1140) PDF(649)
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1996, 26(4): 559-560. doi: 10.6052/1000-0992-1996-4-J1996-054
Abstract(1528) PDF(735)
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1996, 26(4): 561-562. doi: 10.6052/1000-0992-1996-4-J1996-055
Abstract(1246) PDF(616)
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1996, 26(4): 563-569. doi: 10.6052/1000-0992-1996-4-J1996-056
Abstract(1081) PDF(677)
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