Husein, Nur Syuhadah
(2019)
Wind Induced Noise In Microphone Cavity Of Two Way Radio.
Project Report.
Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Aeroangkasa.
(Submitted)
Abstract
This research investigated the relationship of occurrence of wind noise during the operation of using two-way radio for communication purpose. It is done by visualizing the wind flow and the formation of vortex shedding inside cavities. Noise measurement due to wind flow of a two-way radio and its bigger scale model (specimen) was referred to a study that was conducted inside an open-loop wind tunnel. A Computational Fluid Dynamics (CFD) analysis was performed based on the noise measurement wind speed. The effect of wind flow direction, wind velocity of 2 and 4 m/s, and Reynolds Number of 8694 and 17879 were presented in wind noise measurement for a two-way radio. The wind velocity that was used for CFD simulation is calculated by using Reynold Number formula. CFD was used to simulate wind flow over a model to observe the formation of vortex shedding inside cavities with different cavity shape, positions and wind velocity. CFD was used to simulate the velocity magnitude, static pressure and vorticity contour. The result shows that the wind velocity has increased the wind noise for the left-to-right direction of wind flow. The CFD simulation shows a stronger vortex shedding has been formed at the opening edge of the cavity. The velocity contour of cavity at higher wind velocity and higher position is smaller than the velocity contour at nearer cavity position. The result from this research is very significant for the improvement of a two-way radio design in reducing noise during communication.
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