New algorithms for approximation of Bessel transforms with high frequency parameter
Zaman, Sakhi 1Siraj-ul-Islam 1Khan, Muhammad Munib 1Ahmad, Imtiaz2
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作者信息
1. Univ Engn & Technol Peshawar
2. Univ Swabi
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Abstract
Accurate algorithms are proposed for approximation of integrals involving highly oscillatory Bessel function of the first kind over finite and infinite domains. Accordingly, Bessel oscillatory integrals having high oscillatory behavior are transformed into oscillatory integrals with Fourier kernel by using complex line integration technique. The transformed integrals contain an inner non-oscillatory improper integral and an outer highly oscillatory integral. A modified meshfree collocation method with Levin approach is considered to evaluate the transformed oscillatory type integrals numerically. The inner improper complex integrals are evaluated by either Gauss-Laguerre or multi-resolution quadrature. Inherited singularity of the meshfree collocation method at x = 0 is treated by a splitting technique. Error estimates of the proposed algorithms are derived theoretically in the inverse powers of omega and verified numerically. (C) 2021 Elsevier B.V. All rights reserved.
Key words
Bessel integral transforms/Complex line integration/Meshfree collocation method/Gauss-Laguerre and multi-resolution quadratures/GENERALIZED QUADRATURE-RULES/OSCILLATORY BESSEL/FAST INTEGRATION/COMPUTATION/SCATTERING
NSTL
Elsevier