The Concept of Active Voice Reduction using Multipole Secondary Source: Case Study of C-150 Aircraft

Muhammad Kusni

doi:10.56741/jnest.v1i01.68

The Concept of Active Voice Reduction using Multipole Secondary Source: Case Study of C-150 Aircraft

Authors

Muhammad Kusni Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Indonesia

DOI:

https://doi.org/10.56741/jnest.v1i01.68

Keywords:

active voice reduction, multipole secondary source, aircraft

Abstract

In order to protect residents living around the airport from aircraft noise disturbance, regulations have been set for the maximum permissible noise level limit. One of the international regulations that regulate the limits of aircraft exterior noise levels is the Federal Aviation Regulation (FAR) part 36 of the United States Regulatory Agency, or the Civil Aviation Safety Regulation (CASR) part 36 of the national regulatory agency. In addition, for military purposes, observer planes are also needed with the lowest possible sound level such that they will not attract the enemy's attention. This paper contains the concept of active exterior sound control/elimination with an unconventional secondary source method (anti-noise), using the multipole secondary source method. Multipole secondary sources are developed based on Taylor series expansion to obtain higher order secondary sources, such as dipoles, quadrupoles, octopoles, and so on, which are used for noise canceling. A significant noise reduction can be obtained by using a high-order secondary source and by optimizing the power of the secondary source. Numerical simulation of noise reduction in the free field was carried out by this method. The simulation results show that noise reduction reaches 50 dB at 200 Hz. The method, which is still a concept, was then used to simulate noise reduction on a Cessna-150 aircraft.

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Author Biography

Muhammad Kusni, Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Indonesia

Muhammad Kusni is a lecturer at the Faculty of Mechanical and Aerospace Engineering, Bandung Institute of Technology (ITB). He got his bachelor and his master degree from the Department of Aerospace Engineering, ITB. His areas of expertise are Lightweight Structures, Numerical Analysis, and Computer Simmulation. He has handled many projects in the field of aircraft development

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