By K. Abe (auth.), S. Kobayashi, N. Nishimura (eds.)

The Boundary point tools (BEM) has turn into the most effective instruments for fixing several types of difficulties in engineering technology. The overseas organization for Boundary point equipment (IABEM) used to be demonstrated so as to advertise and facilitate the alternate of clinical principles relating to the idea and purposes of boundary aspect equipment. the purpose of this symposium is to supply a discussion board for researchers in boundary aspect tools and boundary-integral formulations mostly to give modern techniques and methods resulting in the development of services and knowing of this com putational method. the subjects coated during this symposium contain mathematical and computational points, functions to reliable mechanics, fluid mechanics, acoustics, electromagnetics, warmth move, optimization, regulate, inverse difficulties and different interdisciplinary difficulties. Papers deal ing with the coupling of the boundary aspect procedure with different computational equipment also are incorporated. The editors wish that this quantity provides a few cutting edge strategies and helpful knowl side for the advance of the boundary aspect equipment. February, 1992 S. Kobayashi N. Nishimura Contents Abe, K.

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REFERENCES Aoki, S. Kishimoto {1989}. Prediction of galvanic corrosion rate by the boundary element method. ComPut. Math. Appl. G. Schechter (1970). qptimization: Theor,y and Practice, McGraw-Hill, New York. A. (1978). The Boundary Element Method for Engineers. Pentech Press, London. G. (1986). Corrosion Engineering. 3rd Edition. McGraw-Hill, New York. Vibrations of Reissner Plates by BEM and D/BEM: A Comparison H. Antes and W. Cheng Institut fur Angewandte Mechanik, Technische Universitat Carolo Wilhelmina, D-3300 Braunschweig, Germany Summary During the last decade, the Boundary Element Method (BEM) has emerged as an accurate and efficient numerical method for plate dynamic analysis (for a survey, see [1]).

Analytical boundary integral expressions for random variations of displacements, stresses and natural frequencies are derived and boundary elements are used in computational procedures. Introduction Models and solutions widely used in classical boundary value problems are too idealized and can not reflect the complexity of real physical phenomena. Therefore one can obtain a more adequate description by replacing deterministic function, which describes boundary conditions, material properties or shape of the boundary, by stochastic functions.

Then u(x) can be 42 represented by the weak form of the Poincare identity [1]: = grad¢(x) + rotA(x) u(x) A(x) = ~(x) L y)~(y)dy + L G(x, - ,x E 0' (1) V(n /\ u)(x) g(x,y)Q(y)dy - V(n· u)(x) where n is the inner normal to 0' ,~ = rotu is the vorticity, Q = divu is the expansion, G(x, y) = 1/(41Tlx - yD, and V is the simple layer operator [7] V(J)(x) = 1r G(x,y)f(y)ds lI X EO' or its weak extension when x E r [7], and /\ denotes the exterior (cross) product in R3. This identity holds for u(x) square summable in 0', with Q and ~ square summable and with compact support D in 0', so that u(x) is harmonic in R3 - D and u(x) = O(1/lxI2) for x (2) -+ 00 Thus the normal and the tangential traces u .