Investigation of Vibration Characteristics of Stir Cast Aluminum Reinforced SiC Composite Beam

In various applications such as plant mines or mechanical systems, machines in operation generate significant vibrations which are transmitted from the foundation to the surrounding environment and precision instruments.In order to minimize these vibrations, they must be either isolated, absorbed, or damped.The current study investigates the effects of an oil damper, passive vibration isolator, and absorbers (single and double) on the vibration frequency of a composite beam made of Al6061 (with 90% weight fraction) and SiC (with 10% weight fraction) produced through the stir casting process.Experimental analysis was conducted on the fabricated composite beam to investigate the frequencies of the fundamental vibration modes under hinged-hinged, fixed-free, and fixed-hinged boundary conditions.Results indicate that the absorber, damper, and isolator have a significant effect in reducing the amplitude of vibrations, resulting in lower frequencies compared to the main frequency.Furthermore, as the number of holes in the beam increases, the frequencies decrease due to a decrease in stiffness.The frequencies are higher for fixed-free end conditions without holes compared to other conditions.The oil damper was found to be more effective in reducing vibrations compared to absorbers and isolators.