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Stability　Criteria　for　Large－Scale　Linear　Systems　with　Structured　Uncertainties

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Journal of Modern Transportation 1996年第2期13卷 46-53页

作者： cao dengqing institute of applied mechanics,southwest jiaotong university,chengdu 610031,china

The robust stability analysis for large scale linear systems with structured time varying uncertainties is investigated in this *** using the scalar Lyapun... 详细信息

The robust stability analysis for large scale linear systems with structured time varying uncertainties is investigated in this *** using the scalar Lyapunov functions and the properties of M matrix and nonnegative matrix,stability robustness measures are *** robust stability criteria obtained are applied to derive an algebric criterion which is expressed directly in terms of plant parameters and is shown to be less conservative than the existing ones.A numerical example is given to demonstrate the stability criteria obtained and to compare them with the previous ones.

关键词： large scale system robust stability structured uncertainty Lyapunov method decentralized control

STABILITY ROBUSTNESS MEASURES OF LINEAR STATE-SMCE MODELS WITH STRUCTURED PERTURBATIONS

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Systems Science and Mathematical Sciences 1998年第1期11卷 32-38页

作者： (institute of applied mechanics, southwest jiaotong university, chengdu 610031, china)

This paper considers the robust stability of state-space models of linear systemssubject to real structured perturbations. The "Zero exclusion principle ", which is basedon the properties of the Kronecker product and the bialternate product, is employed toderive the new robust stability bounds for time-invariant perturbations. Vaious examplesare presented to demonstrate the merit of the method proposed. The examples show thatthe new bounds are easy to compute numerically and can expect an arbitrary degree ofimprovement over the previous ones reported by the Lyapunov stability method and thefrequency domain approach.

关键词： Robust stability linear uncertain systems structured perturbations matrisapproach.

EXPERIMENTAL INVESTIGATION ON HISTORY-DEPENDENCEOF PLASTIC BEHAVIOR OF TYPE 302 STAINLESS STEELUNDER COMBINED AXIAL-TORSIONAL LOADS

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Acta Metallurgica Sinica(English Letters) 1997年第1期10卷 65-70页

作者： S.X. Zhao X.F. Sun and Z.B. Kuang (institute of applied mechanics, southwestern jiaotong university, chengdu 610031, china)(institute of Engineering mechanics, Xi’an jiaotong university, Xi’an 710049, china) southwestern jiaotong Univ Chengdu China

Experimental investigations were pedermed on the plastic deformation along bilinear strain paths with various values of corner-angle by subjecting thin-walled tubular specimens of type 302 stainless steel to combined axial and torsional loads. Variations of scalar and vectorial behavior of the stress response are discnssed in the vector space of plastic strain. It is found that the intrinsic geometry of loading path, the plastic strain history and the coapled effect among strain components effect effectively the stress response of the material. The experimental results also show that these effects will disappear gradually with increasing strain.

关键词： complex loading plastic delay angle history-dependence of plastic deformation

NumericalAnalysisforBucklingandPost─BucklingBehaviorofPlanarFrames

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Journal of Modern Transportation 1996年第1期13卷 68-78页

作者： Wang Xiaochun institute of applied mechanics, southwest jiaotong university, chengdu 610031, china

Research on the problem of buckling and post buckling for structures is one of noticed directions in the field of engineering mechanics at present. Whether from the aspect of theory or from the aspect of numerical method, it is necessary to have a deep research on the problem. In this paper, a new geometrical nonlinear element and numerical implementation were presented. By some examples, the problem of buckling and post bukling for planar frames subjected to given loads was discussed in detail.

关键词： planar frame buckling post buckling finite element numerical analysis

Numerical Simulation for Prediction of Wind Loads on Building Surfaces

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Journal of Modern Transportation 1997年第1期14卷 56-62页

作者： Zhang Xiaogang institute of applied mechanics, southwest jiaotong university, chengdu 610031, china

The reliability of the numerical K ε model for determining wind pressure on building surfaces is evaluated. The solution algorithm is based on a body fitted non orthogonal curvilinear coordinate system and a staggered grid arrangement. The covariant velocity components are chosen as dependent variables. Convective fluxes are described by the Power Law Scheme. The grids are generated with an elliptic grid generator using control functions. The results compare favorably with those by Oxford wind tunnel measurements.

关键词： numerical simulation wind loads building

On　Probabilistic　Distribution　of　Fatigue　Strength

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Journal of Modern Transportation 1997年第1期14卷 21-26页

作者： Feng Zhenyu Gao Qing institute of applied mechanics, southwest jiaotong university, chengdu 610031, china

In this paper, a probabilistic distribution of fatigue strength as a function of fatigue life is discussed. The transformation method between fatigue life and fatigue strength developed in the past by other methods did not deal with the fact that the scatter factor of fatigue life increases at a low stress level. A modified model of fatigue strength distribution based on the fatigue scatter investigation is presented in this paper. The results of the statistical inferences from a large sample fatigue test indicate that the proposed model can be accepted at a 10% level of significance.

关键词： reliability fatigue strength probabilistic distribution statistical inference

The Molecular Structure and Potential Energy Function for Ne-HF System

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原子与分子物理学报 1999年第3期16卷 36-41页

作者： HUANG Zheng a, RAN Ming b, ZHU Zheng he b (a. Department of applied Physics southwest jiaotong university, chengdu 610031, china b. institute of Atomic and Molecular Physics, Sichuan university, chengdu 610065, china) Department of applied Physics southwest jiaotong university Chengdu 610031 China Department of Chemistry Sichuan Normal University Chengd 610066 China institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China

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关键词： Ne-HF ab initio Many-body expansion theory Analytical potential energy function

On the Spontaneous Electric Field in a Ferroelectric Body

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Journal of Modern Transportation 1998年第2期15卷 39-49页

作者：张颖

The incompatibility of the spontaneous polarization across the interface between two grains may induce internal stress and electric fields in a ferroelectric body. The built up of stresses and electric fields may seriously affect the functioning of ferroelectric materials. In this article, the effects of the incompatibility of the spontaneous polarization for various types of interfaces on the electric fields are discussed. Numerical results indicate that the incompatibility of the spontaneous polarization may result in the electric field being unbounded when the interface does not have a continuous normal.

关键词： ferroelectrics spontaneous polarization electric field

Object─OrientedFiniteElementProgramminginC＋＋

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Journal of Modern Transportation 1996年第1期13卷 79-90页

作者： cao Zhongqing Zhou Benkuan institute of Computational Engineering Science, southwest jiaotong university, chengdu 610031, china

The problems with traditional finite element program (FEP) can be solved by object oriented programming (OOP). This paper describes the application of OOP to finite element programming. The classes of object oriented FEP are given, and several class hierarhies are illustrated. The features of object oriented languages such as inheritance, encapsulation, and ploymorphism are fully applied in the FEP developed by the authors. Compared with the traditional FEP (usually in Fortran), our object oriented FEP in Borland C++ is more structured, more easily to be written, maintained and expanded. An outstanding feature of our FEP is that it can include not only displacement type elements but also hybrid stress elements. To demonstrate reusability and extensibility on the object oriented FEP, examples of adding new types of elements are given.

关键词： finite element method OOP class reusability extensibility