Magnetic Tunable Vibration Absorber

Technology #2812


Two researchers from the College of Mechanical Engineering, Kenneth A. Cunefare and Anne-Marie Albanese Lerner, at the Georgia Institute of Technology have explored vibration absorbers. There are three kinds of vibration absorbers:  the tuned vibration absorber (TVA), the active vibration controller (AVC), and the adaptive vibration absorber (AVA). The goal of a vibration absorber is generally is to reduce vibration in a structure where the effects of the vibration are negative. A tuned vibration absorber (TVA) is used in many applications for the suppression of a specific vibration frequency. TVAs are used in many applications because of their relative low cost and well-established vibration absorption capabilities. TVAs, however, suffer the drawbacks of being passive devices and of being effective only for a relatively narrow bandwidth. The active vibration controller (AVC). An AVC typically includes real-time, property-changing characteristics and therefore can be highly effective. But uses of AVCs vibration control mechanisms have been limited because AVCs are generally costly to implement. Another problem that may arise in the use of AVC is that of an AVC adding energy to the system (and possibly driving the system into instability) in the event of an unanticipated excitation or improper control of the AVC.

Thus, there is a need for a vibration absorber that includes the advantages, but does not suffer the drawbacks of the TVAs nor the limitations of the AVCs. There is a need for a vibration absorber that effectively and essentially eliminates vibration in structures and that is available at low cost with well-established vibration absorption capabilities. There is a need for a vibration absorber that may adaptively operate over a frequency range without the problems associated with adding energy to the system. Further, there is a need for a vibration absorber that is lightweight and compact.


The invention discussed is an adaptive vibration absorber (AVA) and variation thereof. This includes variations in methods and systems of usage. An exemplary AVA may operate adaptively over an appropriate relatively wide bandwidth or frequency range in vibration absorption without adding energy to the system and the problems associated with such energy addition. Further, the exemplary AVA may be of low cost as well as lightweight and compact.


·  Eliminates Vibration

·  Low cost

·  Wide bandwidth and frequency range

·  Lightweight

·  Compact

·  Low/no energy addition to the system


·  Vibration absorption

·  Aerospace

·  Automobile industry

·  Acoustics


·  Kenneth A. Cunefare

·  Anne-Marie Albanese Lerner