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Variable stiffness type magnetic vibration absorber to control the vibration of beam structure

Vibration absorbers are frequently used to control and minimize excess vibration in structural systems. Dynamic vibration absorbers are used to reduce undesirable vibration in many applications such as pumps, gas turbines, engines, bridges, electrical generators, etc. To reduce the vibration of the system, the frequency of the absorber should be equal to the excitation frequency. The aim of this paper is to investigate the use of a variable stiffness type magnetic vibration absorber to control the vibration of beam structure. This study will aim to develop variable stiffness of a magnetic vibration absorber to adapt to the change in a vibratory system; its stiffness can be varied by changing the distance between magnets. The absorber system is mounted on a cantilever beam acting as primary system. The objective is to suppress the vibration of the primary system subjected to a harmonic excitation whose frequencies vary. This can be achieved by varying the stiffness by changing the distance between the magnets. The advantage of a magnetic vibration absorber is that it can be easily tuned to the excitation frequency, so it can be used to reduce the vibration of a system subjected to variable excitation frequency.