Experimental and computational fluid dynamics (cfd) analysis of wind-induced noise in two-way radio
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Date
2016-09-01
Authors
Ummi Masyitah Mohd Fisol
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Abstract
This research investigated the wind flow and formation of vortex shedding inside cavities to understand the relationship of those to the occurrence of noise during communication using two-way radio device. Noise measurement due to wind flow of a two-way radio and its bigger scale model (specimen) was conducted inside an open-loop wind tunnel. A Computational Fluid Dynamics (CFD) analysis was also performed. The effect of wind flow direction, wind velocity of 2, 6 and 10 m/s, Reynolds Number of 8694, 26083 and 43471, respectively and angle of attack (0-45 degrees) were presented in wind noise measurement for a two-way radio. Measurement of Sound Pressure Level (SPL) inside cavities with five different wind velocities and distances from wind source has been conducted on the specimen. CFD was used to simulate wind flow over a model to observe the formation of vortex shedding inside cavities with different cavity positions and wind velocity. Validation has been done by comparing CFD simulation with experimental work of Koschatzky et al. (2011) using the same geometry of cavity for wind velocity of 12 and 15 m/s. The result shows that the wind velocity has increased the wind noise for both direction of wind flow with stronger effect for the left-to-right flow. The SPL is also increased with the increased of wind velocity and the further position from wind source, the stronger SPL has been encountered. The CFD simulation shows a stronger vortex shedding has been formed at the edge, wall and floor of the cavity. The vortex shedding formation is increased at further cavity position and higher wind velocity. CFD simulation agrees with the finding of the experimental work with Root-Mean-Square Error (RMSE). The result from this research is very significant for the improvement of a two-way radio design in reducing noise during communication.