Active Tuning Of Dynamic Vibration Absorber (DVA) For Suppresing Structural Vibration

The dynamic vibration absorber (DVA), also called the tuned vibration absorber (TVA), is commonly used in engineering applications. It can be used to suppress vibrations of structures, either globally for rigid structures or locally for flexible structures. DVAs can be divided into passive DVAs, active DVAs and semi-active DVAs. The passive DVA consists of a mass, a spring, and a damper. The mechanical simplicity of the passive DVA gives it good stability and it can suppress undesired vibrations of primary structures excited by harmonic forces. However, the passive DVA is only effective over a very narrow frequency range. To increase the effective frequency range, there is the invention of active DVA. The active DVA is also called the active–passive vibration absorber. It can be considered as a DVA with an active element attached. By controlling the activation force, the vibration reduction performance of the active DVA can be improved. In this project report, active tuning of dynamic vibration absorber on suppressing the structural vibration was studied. An active dynamic vibration absorber system was constructed. Frequency detection method was discussed. An electric motor was used as the active element to the system. The vibration amplitude of the primary system can reduce effectively when active vibration absorber is added to the system.