Control of vibration by using dynamic vibration absorber

Abstract

Vibration is one of the most important problems that engineering systems and suspension systems which negatively affected the performance of the system as it leads to energy loss, equipment damage, mechanical parts erosion, low product cost and quality. Therefore, many methods have been studied to reduce the vibrations, and the most important of these methods is the use of a vibration absorbent. Several different technologies have been used to improve the performance of adaptation, and the important one from these technologies is the use of smart materials. The present invention relates to a vibration absorber which an absorber end mass is coupled to a primary mass from two degrees of freedom, with shape memory alloy (SMA) springs. Preferably, the end mass is coupled to the primary mass with several discrete SMA springs, which may be individually heated. When each of the SMA spring is heat above a predetermined temperature, the SMA material undergoes a phase change that results in a change in the stiffness of the SMA spring. Experimental and theoretical results have shown that the SMA-based dynamic vibration absorption is more effective in reducing the vibration amplitude for a wider frequency range. The range of error does not exceed 20% approximately. Therefore, good agreements between theoretical and experimental results in 2DOF system are obtained.