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Title: Applying a Step Approach Method in Solving the Multi-Frequency Radiation From a Complex Obstacle
Authors: Jui-Hsiang Kao
Contributors: 國立臺灣海洋大學:系統工程暨造船學系
Keywords: Step approach method
Time domain
Radiated waves
Multiple frequencies
Boundary integral equation
Neumann boundary condition
Date: 2016-12
Issue Date: 2018-10-05T01:00:01Z
Publisher: CMES-Computer Modeling in Engineering & Sciences (SCI)
Abstract: Abstract: In this paper, a step approach method in the time domain is developed
to calculate the radiated waves from an arbitrary obstacle pulsating with multiple
frequencies. The computing scheme is based on the Boundary Integral Equation
and derived in the time domain; thus, the time-harmonic Neumann boundary condition
can be imposed. By the present method, the values of the initial conditions
are set to zero, and the approach process is carried forward in a loop from the first
time step to the last. At each time step, the radiated pressure on each element is
updated. After several loops, the correct radiated pressures can be obtained.
A sphere pulsating with a monopole frequency in an infinite acoustic domain is calculated
first. This result is compared with the analytical solution, and both of them
are in good agreement. Then, a complex-shaped radiator is taken as the studied
case. The pulsating frequency of this case is multiple, and the waves propagate in
half space. It is shown that the present method can treat multiple-frequency pulsation
well, even when the radiator is a complex shape, and a robust convergence can
be attained quickly.
Relation: 112(1) pp.59-73
Appears in Collections:[Department of Systems Engineering and Naval Architecture] Periodical Articles

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