An inverse model for locating skin tumours in 3D using the genetic algorithm with the Dual Reciprocity Boundary Element Method

Noise generated by ships is one of the most significant noises in seas, and the propeller has a significant impact on the noise of ships, which reducing it can significantly lower the noise of vessels. In this study, a genetic algorithm was used to optimize the hydro-acoustic and hydrodynamic performance of propellers. The main objectives of this optimization were to reduce the propeller noise and increase its hydrodynamic efficiency. Modifying the propeller geometry is one of the most effective methods for optimizing a propeller performance. One of the numerical methods for calculating propeller noise is the Ffowcs Williams and Hawkings (FW-H) Model. A numerical code was developed by authors which solved these equations using the velocity and pressure distribution around the propeller and calculated its noise. To obtain flow quantities and to investigate the hydrodynamic performance of the propeller, a code was developed using a Boundary Element Method, the panel method. The geometry of DTMB 4119 propeller was selected for optimization, where geometric modifications included skew angle, rake angle, pitch to diameter (P/D) distribution, and chord to diameter (c/D) distribution. Finally, the results of geometric optimization were presented as Pareto optimal solutions. The results indicated that the optimum geometries had rake angles between 8.14 and 12.05 degrees and skew angles between 31.52 and 39.74 degrees. It was also observed that the increase in the chord up to a specific limit enhanced the efficiency and reduced the noise of the propeller.

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EFFECT OF CONDUCTIVITY IN CORROSION PROBLEM USING BOUNDARY ELEMENT METHOD AND GENETIC ALGORITHM

Knowledge-Based Engineering and Sciences ◽

10.51526/kbes.2020.1.01.58-63 ◽

2020 ◽

Vol 1 (01) ◽

pp. 58-63

Author(s):

Mohammed Aldlemy

Keyword(s):

Genetic Algorithm ◽

Boundary Element Method ◽

Boundary Element ◽

Potential Distribution ◽

Electrical Potential ◽

Matlab Program ◽

Electrolyte Surface ◽

Corrosion Problem ◽

Indirect Analysis ◽

Element Method

Boundary element method applications with inverse solution are used to apply the indirect analysis for modeling of corrosion problem. Laplace equation has been used to model the electrical potential in the electrolyte surface. In this paper a computer modeling has been developed to visualize the effect of conductivity value in corrosion problem. Genetic algorithm is used to create the conductivity value based on the mechanics of natural selection and genetics. The boundary element method is then calculating the potential value of the whole domain. FORTRAN and MATLAB program have been developed to calculate and visualize the potential distribution in the domain. Two-dimensional example problems are analyzed to demonstrate the application of the proposed boundary element modeling procedure.

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Combination of Boundary Element Method and Genetic Algorithm for Optimization of T-shape Noise Barrier

Tehnicki vjesnik - Technical Gazette ◽

10.17559/tv-20190930132137 ◽

2021 ◽

Vol 28 (1) ◽

Keyword(s):

Genetic Algorithm ◽

Boundary Element Method ◽

Boundary Element ◽

Noise Barrier ◽

Element Method

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Numerical Assessment of Plenums Intersected by Four Baffles Using the Boundary Element Method, Genetic Algorithm, and Neural Networks

Noise & Vibration Worldwide ◽

10.1260/0957-4565.44.11.25 ◽

2013 ◽

Vol 44 (11) ◽

pp. 25-44 ◽

Cited By ~ 2

Author(s):

Min-Chie Chiu ◽

Ying-Chun Chang

Keyword(s):

Genetic Algorithm ◽

Neural Networks ◽

Boundary Element Method ◽

Boundary Element ◽

Numerical Assessment ◽

Element Method

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Modification of boundary condition for the optimization of natural frequencies of plate structures with fluid loading

Advances in Mechanical Engineering ◽

10.1177/1687814018796008 ◽

2018 ◽

Vol 10 (8) ◽

pp. 168781401879600 ◽

Cited By ~ 1

Author(s):

Dayi Ou ◽

Cheuk Ming Mak

Keyword(s):

Genetic Algorithm ◽

Finite Element Method ◽

Finite Element ◽

Boundary Element Method ◽

Boundary Conditions ◽

Boundary Element ◽

Natural Frequencies ◽

Fluid Loading ◽

Loaded Plate ◽

Element Method

A finite element method, boundary element method, and genetic algorithm combined method is developed for the optimization of natural frequencies of fluid-loaded plates. In this method, the coupled finite element method–boundary element method is used for the free flexural vibration analysis of plates with arbitrary fluid loading effects and arbitrary elastic boundary conditions, and the genetic algorithm method is combined with the finite element method–boundary element method for searching the optimal values of plate’s boundary parameters. By using this method, multiple natural frequencies of a given fluid-loaded plate can be optimized simultaneously to different target values. The coupled finite element method–boundary element method is first validated by comparing with earlier published results. The proposed optimization method is then applied to the optimal boundary condition design of four different cases. The results show natural frequencies of a fluid-loaded plate are sensitive to its boundary conditions. The possibility of optimizing the natural frequencies of a fluid-loaded plate by modifying boundary conditions is demonstrated, as well as the effectiveness of the proposed method as a structural optimization tool. According to the authors’ knowledge, this study is the first attempt of optimizing fluid-loaded plate natural frequencies by considering arbitrary boundary conditions as optimization variables.

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