Wind induced noise in microphone cavity of two way radio
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Date
2019-06
Authors
Nur Syuhadah Binti Husein
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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.