ABSORBER GEOMETRY SIZE OPTIMIZATION FOR ACOUSTIC ANECHOIC CHAMBER DESIGN USING GENETIC ALGORITHM Joel Christian (a*), Suprayogi (b), Nurwulan Fitriyanti (b)
a) Engineering Pyhsics, School of Electrical Engineering, Telkom University
Jl. Telekomunikasi No. 1, Terusan Buahbatu - Bojongsoang, Sukapura, Kec. Dayeuhkolot, Bandung, Jawa Barat 40257
*
b) Engineering Pyhsics, School of Electrical Engineering, Telkom University
Jalan Ganesha 10, Bandung 40132, Indonesia
Jl. Telekomunikasi No. 1, Terusan Buahbatu - Bojongsoang, Sukapura, Kec. Dayeuhkolot, Bandung, Jawa Barat 40257
Abstract
Anechoic chamber is a room that is made to resemble the condition of empty space. This room has an absorption rate of 99%. Absorber is an important part while manufacturing an anechoic chamber. In an anechoic chamber, absorber affects in terms of absorption and frequency range. Specification of the absorber used depends on the specification of the anechoic chamber to be made. The optimum absorber geometry size is required to maximize net volume of the anechoic chamber. Maximum measurable object size is 0.05x net volume of anechoic chamber. To overcome the problems, it is necessary to optimize the size of the absorber geometry. The size optimization of the absorber geometry has been carried out using a genetic algorithm with MATLAB as the programming software. Incidence angle of the wave and the width of the absorber are used as input parameters for absorber optimization. Optimization results in optimum peak angle and absorber length. The width of the absorber used in this optimization is 0.2 m. The peak angle obtained is 12.2 degree with a length of 0.936 m. The average absorption coefficient obtained is 0.886041.
