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1995 Vol. 27, No. 5

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NUMERICAL STUDY OF THE CONERENT STKUCTURES IN WALL REGION OF A CHANNEL FLOW
This paper aims to investigate the single coherent structure in the wall regionof a channel fiow by minimal flow unit of direct numerical simulation using psendospectralmethod. The mechanism for the formation and evolution of the coherent structure wasstudied by using the idea of resonant triad of the theory of hydrodynamic stability Theresults compared reasonally well with experirnental observations。Meanwhile,it is foundthat collocation method has higher precision than Chebyshev-τmethod。
1995, 27(5): 513-522. doi: 10.6052/0459-1879-1995-5-1995-462
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PASSIVE CONTROL OF INTERACTION BETWEEN SHOCK WAVE AND BOUNDARY LAYER IN TRANSONIC FLOW
This work has been done in a shock tunnel,in the range M_∞=0.732 ～ 0.817and Re_∞=3 × 10￣7,on different half models:circular arc aerofoils with 12%thickness ratioand supercritical aerofoils with 14%thickness ratio。 The results show that:in comparisonwith solid wall of the model,the porous walls with cavity deepness 1mm or 3mm,and thewall with conduit tubes can reduce the peak of Much Number,adverse pressure gradient, andthe strength of shock wave That means passive control can reduce the drag of an aircrafta...
1995, 27(5): 523-535. doi: 10.6052/0459-1879-1995-5-1995-463
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ESSAY ON CONSTITUTIVE RELATION OF WAVE PROPAGATION IN SATURATED POROUS MEDIA
The present paper, based on the mixture theory of continum mechanics,hasdiscussed general equation of wave propagation in saturated porous media。 The effect ofcoupling mass,initial pressure and its buoyancy have been taken into account.The paperis of importance to detail some concepts of this subject and perfect the theory system。
1995, 27(5): 536-543. doi: 10.6052/0459-1879-1995-5-1995-464
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THE COUPLED SOLUTION OF A RIGID LINE INCLUSION AND A CRACK IN ANISOTROPIC PIEZOELECTRIC SOLIDS
, Jiecai Han
The Stroh formalism in anisotropic elasticity is used to analyze the coupledelastic and electric fields for an iufinite , anisotropic electroelastic medium with a rigid lineinclusion and a crack,The explicit real-form solution on the boundary of the inclusion andmatrlx is given and the classical type of singularity for the elastic and electric fieldcomp onents in the neighborhood of the crack tip is also obtained。
1995, 27(5): 544-550. doi: 10.6052/0459-1879-1995-5-1995-465
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A NEW BOUNDARY ELEMENTMETHOD FOR REISSNER’S PLATE WITH NEW BOUNDARY VALUES
A new boundary element formulation for Reissner’s plate bending is pressented.This form of BEM has an advantage in that the bending stresses on the bonndary can becalculated directly from the numerical solution, and avoids the use of tangential derivativesof displacement to find plate bending st resses on the boundary,The effectiveness of theapproach is also discussed through some test examples。In the present BEM formulation,the singular orders of the two kernels are same ais that in the standard BEM formul...
1995, 27(5): 551-559. doi: 10.6052/0459-1879-1995-5-1995-466
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THE FEASIBILITY OF THE DETERMINATION OF RIGID/ELASTIC IMPACT LOADS BETWEEN STRUCTURES WITH THE METHOD OF MODE SUPERPOSITION
In this paper,the problem of both the lateral and the logitudinal impactof bars is investigated.The feasibility of the dertermination of rigid / elastic impact loadsbetween structures with the method of mode superposition is verified。A numerical integra-tion method is developed to evaluate the time history of the impaact load , and the obtainedresults are analyzed and interpreted through the use of the theories of wave propagation,elastic contact and vibration modes。The accuracy and utility of the given me...
1995, 27(5): 560-566. doi: 10.6052/0459-1879-1995-5-1995-467
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STRUCTURAL RESPONSES TO NONSTATIONARY MULTI-POINT RANDOM SEISMIC EXCITATIONS
A highly efficient, convenient and accurate method,i.e。the pseudo-excitationmethod for analyzing the nonstationary responses of structures subjected to multi-piontevolutionary random seismic excitations is established.Both the traveiling wave effect cansedby limited earthquake wave speed and the arbitrary coherency between the structural groundjoints are taken into account.The cross-correlation items between the participant modes andbetween the excitations have been both included,so that this is a complete ...
1995, 27(5): 567-576. doi: 10.6052/0459-1879-1995-5-1995-468
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ASYMPTOTIC METHOD FOR PRIMARY RESONANCE OF A STRONGLY NONLINEAR VIBRATION SYSTEM WITH MANY DEGREES OF FREEDOM
In this paper,an asymptotic method is presented for the analysis of a class ofstrongly nonlinear autonomous vibrating systems with many degrees of freedom。It can beviwed as a generalization of the new asymptotic method￣[1].This method is suitable for thesystems in which primary resonance may occur。Using the present method the equationsgoverning the amplitudes and the phase factors are established.Two numerical examplesare presented which served to demonstrate the effectiveness of the present method。
1995, 27(5): 577-586. doi: 10.6052/0459-1879-1995-5-1995-469
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EXPERIMENTAL STUDY OF MECHANICAL BEHAVIOUR OF TiTi SHAPE MEMORYALLOY
This paper presents experimental results of uniaxial tension-compression de-formation,cyclic tensile loading-unloading deformation, shape memory effect, recovery force,transformation plastic deformation and proportional and nonproportional tension/compressio-torsion deformation for a TiNi polycrystalline shape memory alloy。 The results shows thatthe mechanical behaviour of the shape memory alloy is very different from the ordinaryelastic-plastic materials in many aspects. For example, the“Bauschinger”effect...
1995, 27(5): 587-596. doi: 10.6052/0459-1879-1995-5-1995-470
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INTERACTION OF VORTICES WITH THE SEA-WATER SURFACE
he finite-difference solutions of Navier-Stokes equations are employed to inves-tigate the inetraction between a submerged vortex pair and the sea-water surface。The initialstate of the vortex model is Oseen vortex。Numerical simulations describe the evolution ofthe seawater surface and vorticity field in the interaction process。The effects of Reynoldsnumber,Koude number,and weber number on the surface deformation are discussed。
1995, 27(5): 597-602. doi: 10.6052/0459-1879-1995-5-1995-471
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SECOND ODER LOW-FREQUENCY WAVE FORCES OF AN ARIICULAED CYLINDER IN BICHROMATIC WAVWS
The second order low-frequency wave force of a cylinder art icdated on the seabed in bichromatic waves is given analytically。 It mainly depends on the interaction of thefirst order potential. The effect of the second order response of a cylinder and the secondorder incident potential on the low-frequency wave force can be neglected。
1995, 27(5): 603-608. doi: 10.6052/0459-1879-1995-5-1995-472
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THE FUNDAMENTAL SOLUTIONS FOR THE EQUAL-PARAMETER ORTHOTROPIC PLATE CONTAINING AN ELLIPTICAL HOLE OR A CRACK
The fundamental solutions of complex stress functions or stress intensity factorsfor the equal-parameter orthotrpic plate containing an elliptical hole or a crack are derivedwith the Cauchy integral method,those fundamental solutions are very useful to solve someproblems in elastic mechanics and fracture mechanics by BEM。
1995, 27(5): 609-613. doi: 10.6052/0459-1879-1995-5-1995-473
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BIFURCATION AND LOCALIZATION PHENOMENA OF NONLINEA RMODES IN A NONLINEAR SYSTEM
A 2 degree of freedom system with cubic nonlinear stiffnesses is investigatedby use of the matching method and the method of multiple scales. The nonlinear modesare obtained according to their defiultion。The bifurcation and localization phenomena ofnonlinear modes in the system are analysed in detail.It is shown that the basic mechanismfor nonlinear mode localization is not nonlinear asvmmetries ais concluded by C。 Pierre et al.,but the properties of nonlinear system,i.e., the dependence of the frequency of...
1995, 27(5): 614-618. doi: 10.6052/0459-1879-1995-5-1995-474
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A FINITE-ELEMENT ANALYSIS OF TOUGHENTING AND REINFORCING EFFECTS ON PARTICLE-FILLED MAIERIALS
The microscopic stress distribution in particle-filled material is studied byarisymmetric finite-element method.In this work, the second-phase particle in the formof spheres is modelled as elastic with or without a ducticle interphase between matrix andinclusion。 Detail parametric analysis of the effects of the Young′s modulus of particles andthe thickness of interfacial layer on the stress distribution are discussed。The results of numerical calculation indicate that debonding has a strong tendencyto be ini...
1995, 27(5): 619-623. doi: 10.6052/0459-1879-1995-5-1995-475
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NONLINEAR ANALYSIS OF DYNAMIC STABILITY FOR GENERALLY LAMIN-ARED CIRCULAR CYLINDRICAL THICK SHELLS
Based on Timoshenko-Mindlin hypotheses and Hamilton’s principle,a systemof equations of nonlinear vibration is set up for laminated circular cylindrical thick shellswith parametric excitation。Using a multi-mode approach and the incremebltal harmonicbalance method, a solution for nonlinear dynamic stability of these shells is obtained.Theeffects of the transverse shear deformation,support conditions etc。on the dynamic stabilityof these shells are discussed。
1995, 27(5): 624-630. doi: 10.6052/0459-1879-1995-5-1995-476
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THE COMPLEX GENERALIZED MATRIX EIGENVALUE PROBLEM IN NUMERICAL SOLVER FOR ORR-SOMMERFELD EQUATION
The problem of solving Orr-Sommerfeld equation can usually be transformedinto a complex generalized matrix eigenvalue problem AX=ωBX。 This paper reduces A,Bto upper Hessenberg matrix and upper triangular matrix respectively by U-transformation,then uses Muller′s rootfinding method to obtain all eigenvalues,where the value of charac-teristic polynomial is given by Hyman′s indirect method.When only a judgement of whetherany mode is unstable is needee,the problem can be transformed into a dominant eigenvaluepr...
1995, 27(5): 631-635. doi: 10.6052/0459-1879-1995-5-1995-477
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THE INFRARED TELEMETERING OF STRESS-STRAIN FIELD OF HIGH SPEED TURNING PART
This paper presents a new method of measuring the stress-strain field of highspeed turning part-the infrared telemetering method. The basic elements of the method,the sketch of the meter structure and the parameter are explained, and the measuringpractice example is also provided。
1995, 27(5): 636-640. doi: 10.6052/0459-1879-1995-5-1995-478
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