Abstract
In this paper we study the existence and uniqueness of a solution and propose an iterative method for solving a beam problem which is described by the fully fourth order equation
associated with the Dirichlet boundary conditions. This problem was well studied by Agarwal by the reduction of it to a nonlinear operator equation for the unknown function u(x). Here we propose a novel approach by the reduction of the problem to an operator equation for the nonlinear term \(\varphi (x)=f(x,u(x),u'(x),u''(x),u'''(x))\). Under some easily verified conditions on the function f in a specified bounded domain, we prove the existence, uniqueness and positivity of a solution and the convergence of an iterative method for finding it. Some examples demonstrate the applicability of the theoretical results and the efficiency of the iterative method. The advantages of the proposed approach to the problem over the well-known approach of Agarwal is shown on examples.
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Acknowledgements
The authors would like to thank the reviewers for their helpful comments and suggestions for improving the quality of the paper. The first author, Quang A. Dang, is supported by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under the Grant number 102.01-2017.306, and the second author, Thanh Huong Nguyen, is supported by Thai Nguyen University under the project ƉH2016-TN07-02.
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Dang, Q.A., Nguyen, T.H. Solving the Dirichlet problem for fully fourth order nonlinear differential equation. Afr. Mat. 30, 623–641 (2019). https://doi.org/10.1007/s13370-019-00671-6
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DOI: https://doi.org/10.1007/s13370-019-00671-6
Keywords
- Beam equation
- Existence and uniqueness of solution
- Fully fourth order nonlinear equation
- Iterative method