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1998 Vol. 28, No. 3

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ADVANCES IN MECHANICS
1998, 28(3): . doi: 10.6052/1000-0992-1998-3-J1998-158
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ADVANCES IN MECHANICS
1998, 28(3): . doi: 10.6052/1000-0992-1998-3-J1998-159
Abstract(1258) PDF(723)
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THE ROLE OF MECHANICS IN AGRICULTURAL MODERNIZATION
1998, 28(3): 289-298. doi: 10.6052/1000-0992-1998-3-J1998-145
Abstract(1665) PDF(960)
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Many problems in agricultural modernization are closely related to mechanics. This paper reviews the research of these problems, including tillage, properties of agricultural materials, drying of agricultural products, production of fruits and vegetables, agricultural bioenvironment, water saving irrigation, control of agricutural soil and water resources, and growing of plants, and so on.
SUPPRESSION OF CHAOS: A SURVEY
1998, 28(3): 299-309. doi: 10.6052/1000-0992-1998-3-J1998-146
Abstract(1388) PDF(1141)
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The main methods of to suppressing chaos, including those by random noise, by periodic perturbations, by a dynamical absorber, and by system variable feedback, are summarized. The general forms of those approaches are outlined. Some examples of the applications are presented. The problems to be investigated are pointed out.
RESEARCH ON CONVEX SET THEORY OF UNCERTAIN VIBRATION
1998, 28(3): 310-322. doi: 10.6052/1000-0992-1998-3-J1998-147
Abstract(1641) PDF(984)
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In this paper, an outline on vibration convex-set theory, including its research area, common concepts, existing methods,applications and the development trend, is reviewed.
SIMILARITY METHOD IN FRACTURE MECHANICS
1998, 28(3): 323-338. doi: 10.6052/1000-0992-1998-3-J1998-148
Abstract(1859) PDF(1355)
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The “scale effect” exists for either fracture strength of materials or carrying capabilities of structures.The aim of this paper is to summarize systematically the similarity method, dimensionless numbers and scaling laws in fracture mechanics, together with some author′s point of views.
VEHICLE/TRACK INTERACTIONS: THE STATE-OF-THE-ART
1998, 28(3): 339-348. doi: 10.6052/1000-0992-1998-3-J1998-149
Abstract(1395) PDF(1286)
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Vehicle/track dynamic interaction is very important for the wheel/rail system. A review is here briefly presented of the historical background of the wheel/rail interaction.Recent advances are reviewed on the research in this domain. And recommendations are made for the future research on the vehicle/track dynamic interactions.
ADVANCES IN RESEARCH FOR STATIC AND DYNAMIC BUCKLING OF STRUCTURES
1998, 28(3): 349-360. doi: 10.6052/1000-0992-1998-3-J1998-150
Abstract(2056) PDF(1526)
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In recent years, the study of static and dynamic buckling is a very active research field. In this paper some fundamental problems such as buckling classification, characteristic of dynamic buckling and its characteristic parameters are summarized, the recent advances and the methodology are introduced, other related problems to be concerned about such as dynamic buckling criterion, model analysis and experimental technology are briefly discussed and reviewed.
THE RESEARCH STATE AND SOME PROGRESS ON INVERSE PROBLEM OF FLAW IDENTIFICATION
1998, 28(3): 361-373. doi: 10.6052/1000-0992-1998-3-J1998-151
Abstract(1442) PDF(942)
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This paper gives a brief overview of the development on the inverse problem of flaw detection. Several typical identification methods are discussed, such as, the electric method based on the potential principle, the boundary element method with optimization iterative technique, the theory of diffraction, the translation matrix method, the Born approximation theory, the boundary integration equation and the boundary element method. Some of the author'[KG-*2/3〗s new contributions in this field is introduced a...
FORCED SOLITON IN FLUID MECHANICS
1998, 28(3): 374-382. doi: 10.6052/1000-0992-1998-3-J1998-152
Abstract(2059) PDF(999)
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Forced solitons in fluid mechanics representing by precursor solitons and nonpropagating solitons found in the 1980s are briefly discussed in this paper. Production methods, mechanical models,governing equations, the-state-of-art and the problems to be solved on these solitons are discussed.
ADVANCES IN STUDIES OF INTERNAL SOLITARY WAVES IN STRATIFIED FLUIDS: A REVIEW
1998, 28(3): 383-391. doi: 10.6052/1000-0992-1998-3-J1998-153
Abstract(1605) PDF(992)
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In this paper, a review is presented for the development in the theoretical analysis and symbolic computation of internal solitary waves in stratified fluids, including their application background, experimental reports and results in the theoretical analysis and symbolical computation as well as unsolved problems for future investigations.
PROGRESS FOR FLOW IN MANIFOLDS
1998, 28(3): 392-401. doi: 10.6052/1000-0992-1998-3-J1998-154
Abstract(1826) PDF(1431)
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The flow manifold has various industrial applications and theoretical values. In this paper some basic data,such as friction factor, momentum regain factor, were analyzed systematically for multiple-hole pipes. The theoretical models,calculative methods and the main problems were reviewed, together with some new progresses.
THEORETICAL MODELS OF DROPLET DEFORMATION FOR POLYMER BLEND SYSTEMS IN FLOW FIELDS
1998, 28(3): 402-413. doi: 10.6052/1000-0992-1998-3-J1998-155
Abstract(1470) PDF(1006)
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For two-phase polymer blending systems, the development of theoretical models on the deformation of Newtonian(or viscoelastical)droplet suspended in another Newtonian(viscoelastical)medium is discussed. The dominating factors which influence the droplet deformation include composition, viscosity and elasticity ratios, dynamic interfacial tension, critical capillary number, and flow field type and its intensity. For the systems in which both of the two phases are Newtonian liquids, the theoretical prediction...
TISSUE REINFORCEMENT BY COLLAGEN
1998, 28(3): 414-419. doi: 10.6052/1000-0992-1998-3-J1998-156
Abstract(1937) PDF(748)
Abstract:
Collagen fibres provide tensile reinforcement in the tissues of the body. Their function is illustrated by the properties of three tissues: tendon, articular cartilage and intervertebral disc.Tendons join muscles to bones around the joints of the body. Articular cartilage covers the ends of the bones in most joints. Intervertebral discs join the bones of the spine making it a flexible structure. The degree of reinforcement, β, is given by the volume fraction of collagen in the tissues. The efficienc...
ON THE POINCARE ′-CHETAEV EQUATIONS
1998, 28(3): 420-426. doi: 10.6052/1000-0992-1998-3-J1998-157
Abstract(1715) PDF(955)
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This paper proves that the canonical equations of Poincarè-Chtaev are more general Hamilton equations in terms of noncanonical variables. This shows that the generalized Lagrange equations and the generalized Hamilton equations in terms of remainder coordinates, as well as the Euler-Lagrange equations in terms of quasi-coordinates are particular cases of the Poincarè-Chtaev equations. And then, the theory is extended to the above systems. The application of Poincarè-Chetaev equations in dynamics of nonholo...
ADVANCES IN MECHANICS
1998, 28(3): 431-431. doi: 10.6052/1000-0992-1998-3-J1998-160
Abstract(1530) PDF(881)
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