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Vibration in ducting system has a trivial role in both industrial and domestic applications. Vibration is resulted on duct wall or surface when there is pressure which induced by fluid flowing inside the duct. The duct has ability to withstand vibration. However, extreme level of vibration can lead to excessive deflection or deformation of the duct body and increases maintenance cost. Hence, the objective of this paper is to study the effect of type of material and thickness of air duct on the vibration. ANSYS Workbench software has been used to run the simulation. The flowing fluid which used in this paper is Refrigerant 134a (R-134a) as air conditioning gas with fixed 3 m/s velocity. Besides, this paper also investigated the fluid flow analysis, static structural analysis, modal analysis and harmonic response. For the fluid (FLUENT) the pressure distribution, velocity streamline and fluid structure interaction (FSI) are same for all materials and thickness due to fixed velocity. Those obtained data were transferred into static structural. In structural analysis, study of total deformation has been simulated and the analysed result has been transferred to modal analysis in order to investigate the natural frequencies of the duct. Different type of materials and thickness provide different natural frequencies of the air duct. The results obtained shows that the vibration level on 0.02 m thickness is the least compared to 0.01 and 0.015 m. Among all materials, it is found that Aluminium experiences least vibration due to lowest average amplitude. |
