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2000 Vol. 30, No. 4

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2000, 30(4): . doi: 10.6052/1000-0992-2000-4-J2000-086
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2000, 30(4): . doi: 10.6052/1000-0992-2000-4-J2000-089
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ADVANCES IN THEORY OF STOCHASTICALLY EXCITED AND DISSIPATED HAMILTONIAN SYSTEMS
2000, 30(4): 481-494. doi: 10.6052/1000-0992-2000-4-J1998-038
Abstract(1911) PDF(1052)
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In recent years, the functional form and solution method of the exact stationary solution for multi-degree-of-freedom nonlinear stochastic oscillatory systems under Gaussian white noise excitation were proposed by the present authors using the concepts of integrability and resonance and the property of Poisson bracket in Hamiltonian dynamics. Based on the exact stationary solution, an equivalent nonlinear system method was developed for similar systems. The stochastic averaging method for quasi-Hamiltoni...
REVIEW ON STRUCTURAL CONTROL METHOD
2000, 30(4): 495-505. doi: 10.6052/1000-0992-2000-4-J1998-039
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The basic concepts and basic theories of structural control in civil engineering are introduced in this paper. The development and applications of structural control are discussed, together with limitations and problems in the models that should be solved in the future.
VIBRATORY LOCALIZATION OF MISTUNED BLADED DISK ASSEMBLIES ──A REVIEW
2000, 30(4): 517-528. doi: 10.6052/1000-0992-2000-4-J1998-041
Abstract(1885) PDF(954)
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This paper reviews the state of the art in the vibratory localization of mistuned bladed disks in the past three decades with regard to modal localization and response localization. Blade-to-blade variations (called as mistunings) in their geometry and structural properties occur during the manufacturing process and/or as a consequence of in-service wear. Although small under certain conditions they may localize the vibratory mode and confine the response to a region near the source. Since mistunings can re...
ADVANCES IN OPTIMAL PLACEMENT OF ACTUATORS AND SENSORS
2000, 30(4): 526-516. doi: 10.6052/1000-0992-2000-4-J1998-040
Abstract(2510) PDF(1231)
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A survey on the development on the optimal placement of actuators/sensors for active vibration control and modal tests is given in the paper. The mathematical formulation for optimal placement of actuators/sensors is discussed. Then the correlation between optimal actuator/sensor placement for active vibration control and modal tests is reviewed. Some problems are proposed for further research.
TABOR NUMBER, ADHESION PARAMETER AND ELASTIC THEORY OF MICROSCALE ADHESIVE CONTACT
2000, 30(4): 529-537. doi: 10.6052/1000-0992-2000-4-J1998-042
Abstract(2398) PDF(1128)
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The rapid development of micro-electro-mechanical systems (MEMS) and some other related fields allows us to venture into a research area in which the surface effects dominate most of the phenomena. This paper introduces the microscale elastic theory of adhesive contact, which is often encountered in MEMS fabrication. By analyzing two dimensionless parameters, Tabor number and adhesion parameter, and their influence on adhesive forces, we point out the scale effect that is implicit in the existing adhesive e...
A REVIEW OF THE EVALUATION METHODS OF FATIGUE FRACTURE RELIABILITY OF STRVCTURAL ELEMENTS
2000, 30(4): 538-545. doi: 10.6052/1000-0992-2000-4-J1998-043
Abstract(1875) PDF(1095)
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A detailed review of the evaluation methods of fracture reliability of structural elements under cyclic loading has been made, and based on it, some discussions have been done. All the models for the fracture reliability evaluation are classified into three types according to the status equations, that is, crack length model, fatigue life model and fracture strength model. Every model can find its own position in the engineering application, and with some limits. Some discussions on the further development...
ADVANCE OF THE STUDY OF CRACK PREVENTION BY THE ELECTROMAGNETIC HEAT EFFECT
2000, 30(4): 546-557. doi: 10.6052/1000-0992-2000-4-J1998-044
Abstract(1784) PDF(1069)
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The crack prevention for a conductor with a crack by the heat effect of the electromagnetic field is effective, in extending its service life and improving its security and reliability. The theoretical calculations and experimental studies show that a small welded joint can be formed at a small sphere near the tip of a crack inside, the conductor by smelting as the result of heat concentration effect. The curvature of the crack front will be increased in several orders of magnitude instantly and the stres...
OVERVIEW ON DESCRIPTION METHODS FOR THE SPATIAL DISTRIBUTION OF THE SECOND PHASE IN MULTI-PHASE MATERIALS
2000, 30(4): 558-570. doi: 10.6052/1000-0992-2000-4-J1998-045
Abstract(1709) PDF(1260)
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This paper presents a comprehensive review of description methods for the spatial distribution of the second phase in multi-phase materials. Stereological methods, especially, some new methods developed lately for description of three-dimensional distribution, are discussed. In order to get quantitative relationships between the spatial distribution of the second phase and material properties, it is necessary to select proper spatial scales and description methods to evaluate the distribution, according to ...
PROGRESS OF THE STUDY ON THERMAL STRESS OF HEAT-RESISTING FUNCTIONALLY GRADIENT MATERIALS
2000, 30(4): 571-580. doi: 10.6052/1000-0992-2000-4-J1998-046
Abstract(1617) PDF(2498)
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The concept and the development background of functionally gradient materials (FGM) are introduced in the paper. The thermal stress research results of FGM are reviewed and the development trends in the area are discussed. The current status of the research and the application prospects of thermal stress analysis of FGM are reviewed.
FRACTAL NATURE IN TURBULENCE
2000, 30(4): 581-596. doi: 10.6052/1000-0992-2000-4-J1998-047
Abstract(2689) PDF(1619)
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The recent progresses in the measurement of fractal dimension of turbulent flows and its applications were reviewed in this paper, including the traditional evidences, measurement methods, the findings on fractal dimension of turbulent flows. The author discussed in detail various measurement methods and its application restrictions, the findings on fractal measurement by several researchers especially K.R. Sreenivasan and offered the author's newest measurement findings. The related research fields such as...
RESEARCH DEVELOPMENT OF SOILS CONSTITUTIVE RELATION INVOLVING PRINCIPAL STRESS AXES ROTATION
2000, 30(4): 597-604. doi: 10.6052/1000-0992-2000-4-J1998-048
Abstract(1716) PDF(1155)
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The influences of principal stress axes rotation.on geotechnical engineering attract more and more attention. In this paper, the basic deformation characteristics of soils involving pure principal stress axes rotation, pure variation of stress Lode angle, multiple-factor variation, drained and undrained, are discussed. The influential soil constitutive models involving principal stress axes rotation, such as Matsuoka's model, kinematic hardening model, bounding surface model and the complete stress incremen...
ADVANCE IN THE RESEARCH OF RECEPTOR- LIGAND BINDING KINETICS
2000, 30(4): 605-612. doi: 10.6052/1000-0992-2000-4-J1998-049
Abstract(2567) PDF(1175)
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The interaction between receptor and ligand is specific and reversible. κf, κr andκa, which represent forward rate constant, reverse rate constant and affinity constant, respectively, can be used to describe the characters of the reaction kinetics. Many studies on three-dimensional binding kinetics have been done when either receptor or ligand is in a dissolved state. Another case is that the binding of receptor to ligand is two-dimentional when both of receptor and ligand locate on the surface of cell memb...
MODERN CLASSICAL PHYSICS THROUGH THE WORK OF G.Ⅰ. TAYLOR
2000, 30(4): 613-621. doi: 10.6052/1000-0992-2000-4-J1998-050
Abstract(2341) PDF(994)
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One scientist's work provides material for an entire course, covering topics ranging from hydrodynamic stability and turbulence to electrohydrodynamics and the locomotion of small orgamsms.
2000, 30(4): 622-622. doi: 10.6052/1000-0992-2000-4-J1998-262
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2000, 30(4): 627-629. doi: 10.6052/1000-0992-2000-4-J1998-263
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2000, 30(4): 630-630. doi: 10.6052/1000-0992-2000-4-J1998-264
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2000, 30(4): 631-632. doi: 10.6052/1000-0992-2000-4-J1998-265
Abstract(1227) PDF(781)
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2000, 30(4): 633-633. doi: 10.6052/1000-0992-2000-4-J1998-266
Abstract(1180) PDF(829)
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