Vibration and Acoustic Characteristics of Aluminium Silicon Carbide Metal Matrix Composite Under Uniform and Non Uniform Thermal Environment

Abstract

Vibration and acoustic characteristics of metal matrix composite - (MMC) of aluminium Silicon carbide is compared with aluminium in lower frequencies. The free and forced vibration responses of different percentage of silicon carbide are examined for different percentage of buckling temperature under uniform and non uniform temperature distribution. The results show that temperature field at higher % of buckling temperature influences the acoustic response significantly. Also it is noticed that uniform temperature field, (T(x) = Tmax) and Increase and decrease temperature fields modelled by heating at the middle of the panel ( $T(x)= T_{max}[1-abs (1-\frac {2x}{L})^{2}]$ )) temperature field affects the response significantly. Further, it is noticed in all the aspects high % of silicon carbide contributes in high stiffness and there by reduces noises at low frequencies even under different temperature field. Also from the results obtained in lower frequencies, it is found that nearly 5 to 15 dB of noise is reduced for high stiffness associated mixture of silicon carbide reinforcement in aluminium matrix.