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Approximation of the initial value for damped nonlinear hyperbolic equations with random Gaussian white noise on the measurements
AIMS Mathematics 2022, 7(7): 12620-12634
Published: 15 July 2022
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The main goal of this work is to study a regularization method to reconstruct the solution of the backward non-linear hyperbolic equation u t t + α Δ 2 u t + β Δ 2 u = F ( x , t , u ) come with the input data are blurred by random Gaussian white noise. We first prove that the considered problem is ill-posed (in the sense of Hadamard), i.e., the solution does not depend continuously on the data. Then we propose the Fourier truncation method for stabilizing the ill-posed problem. Base on some priori assumptions for the true solution we derive the error and a convergence rate between a mild solution and its regularized solutions. Also, a numerical example is provided to confirm the efficiency of theoretical results.

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