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: 2026
: .., .. // . - 2026. - . 119. - .39-60.
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(.): optimal control, mathematical model of propagation of damped waves in shallow water, Sobolev type equations, projection method
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(.): Combining the methods of the theory of high-order Sobolev-type equations, the methods of monotone operators and compactness, it was possible to prove the existence of a unique solution to the initial-boundary value problem for the inhomogeneous equation of the complete semilinear second-order Sobolev-type equationfor the case of self-adjoint and non-negative definite operators in the linear part and an s-monotone, p-coetitive and homogeneous nonlinear operator with a symmetric Frechet derivative. The extendability of the local solution to an arbitrary time interval is shown, which made it possible to formulate and solve the optimal control problem. In the optimal control problem, the optimality criterion is the balance (classical) functional, the norms used in it are determined by the theorem of existence of a solution to the initial-boundary value problem. The abstract results are then applied to an initial-boundary value problem for the Boussinesq Love equation with a nonlinear power-law term characterizing convection in the medium, which models the propagation of decaying waves in shallow water. The mathematical model also takes capillary forces into account, so the operator at the highest time derivative may be irreversible, making the equation a Sobolev-type equation. Furthermore, the Boussinesq Love equation models longitudinal oscillations in a thin elastic rod. *-weak convergence of approximate solutions constructed on the basis of the projection method (Galerkin method) for the system of eigenfunctions of the operator -Delta is proved. The initial conditions of Cauchy and Showalter Sidorov are considered.
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