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E-raamat: Generalized Point Models in Structural Mechanics illustrated edition [World Scientific e-raamat]

(St Petersburg Univ, Russia)
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Teised raamatud teemal:
This book presents the idea of zero-range potentials and shows the limitations of the point models used in structural mechanics. It also offers specific examples from the theory of generalized functions, regularization of super-singular integral equations and other specifics of the boundary value problems for partial differential operators of the fourth order.
Preface v
Vibrations of Thin Elastic Plates and Classical Point Models
1(62)
Kirchhoff model for flexural waves
1(8)
Fundamentals of elasticity
1(1)
Flexural deformations of thin plates
2(4)
Differential operator and boundary conditions
6(1)
Flexural waves
7(2)
Fluid loaded plates
9(3)
Scattering problems and general properties of solutions
12(22)
Problem formulation
12(2)
Green's function of unperturbed problem
14(5)
Integral representation
19(3)
Optical theorem
22(6)
Uniqueness of the solution
28(4)
Flexural wave concentrated near a circular hole
32(2)
Classical point models
34(19)
Point models in two dimensions
34(11)
Scattering by crack at oblique incidence
45(4)
Point models in three dimensions
49(4)
Scattering problems for plates with infinite crack
53(10)
General properties of boundary value problems
53(1)
Scattering problems in isolated plates
54(6)
Scattering by pointwise joint
60(3)
Operator Methods in Diffraction
63(44)
Abstract operator theory
63(13)
Hilbert space
63(4)
Operators
67(1)
Adjoint, symmetric and selfadjoint operators
68(3)
Extension theory
71(5)
Space L2 and differential operators
76(6)
Hilbert space L2
76(4)
Generalized derivatives
80(1)
Sobolev spaces and embedding theorems
81(1)
Problems of scattering
82(8)
Harmonic operator
82(2)
Bi-harmonic operator
84(1)
Operator of fluid loaded plate
85(4)
Another operator model of fluid loaded plate
89(1)
Extensions theory for differential operators
90(17)
Zero range potentials for harmonic operator
91(3)
Zero range potentials for bi-harmonic operator
94(4)
Zero range potentials for fluid loaded plates
98(6)
Zero range potentials for the plate with infinite crack
104(3)
Generalized Point Models
107(90)
Shortages of classical point models and the general procedure of generalized models construction
107(5)
Model of narrow crack
112(25)
Introduction
112(1)
The case of absolutely rigid plate
113(2)
The case of isolated plate
115(1)
Generalized point model of narrow crack
115(2)
Scattering by point model of narrow crack
117(6)
Diffraction by a crack of finite width in fluid loaded elastic plate
123(9)
Discussion and numerical results
132(5)
Model of a short crack
137(29)
Diffraction by a short crack in isolated plate
138(14)
Generalized point model of short crack
152(5)
Scattering by the generalized point model of short crack
157(4)
Diffraction by a short crack in fluid loaded plate
161(4)
Discussion
165(1)
Model of small circular hole
166(11)
The case of absolutely rigid plate
166(2)
The case of isolated plate
168(5)
Generalized point model
173(3)
Other models of circular holes
176(1)
Model of narrow joint of two semi-infinite plates
177(20)
Problem formulation
177(3)
Isolated plate
180(7)
Generalized model
187(3)
Scattering by the generalized model of narrow joint
190(7)
Discussions and Recommendations for Future Research
197(32)
General properties of models
197(8)
Generalized models in two dimensions
198(5)
Structure of generalized models in three dimensions
203(2)
Generalized models in the plate with infinite crack
205(1)
Extending of the model of narrow crack to oblique incidence and edge wave analysis
205(7)
Reformulation of the model
205(2)
Edge waves propagating along a narrow crack
207(5)
Further generalizations and unsolved problems
212(5)
Models with internal structure
212(1)
Restrictions of accuracy
213(3)
Other basic geometry
216(1)
Other approximate theories of vibrations
216(1)
Model of protruding stiffener in elastic plate
217(12)
Introduction
217(1)
Classical formulation
217(1)
Zero-range potentials
218(4)
Scattering by the zero-range potential
222(2)
Choice of parameters in the model
224(3)
Generalized model of protruding stiffener in fluid loaded plate
227(2)
Appendix A Regularization and Analysis of Boundary-Contact Integrals 229(10)
A.1 Boundary-contact integrals in two dimensional problems
229(3)
A.2 Boundary-contact integrals for oblique incidence
232(1)
A.3 Low frequency asymptotics
233(1)
A.4 Boundary-contact integrals in three dimensions
234(2)
A.5 Boundary-contact integrals for the plate with infinite crack
236(3)
Appendix B Integral Equations of Convolution on a Finite Interval 239(12)
B.1 Integral equations of convolution
239(1)
B.2 Logarithmic singularity of the kernel
240(5)
B.3 Supersingular kernels
245(3)
B.4 Smooth kernels
248(3)
Appendix C Models Used for Numerical Analysis 251(2)
Bibliography 253(6)
Index 259