Faculty of Engineering and Natural Sciences
Vibration Absorption with Nearly Irreversible Energy Sinks
İlker Murat Koç
This study describes and demonstrates the concept of “linear energy sinks” as an alternative to conventional methods of vibration absorption and damping. Linear energy sinks do not rely on dissipation of energy as heat. Instead they are undamped linear substructures which can be attached to or an integral part of a vibrating structure (primary structure). This study shows that even though energy recurrence is a general characteristic of undamped linear systems, a set of linear oscillators that make up an energy sink absorbs and retains most of the vibratory energy without the need of a dissipative mechanism when oscillators have a particular frequency distribution. The approach to obtain such a frequency distribution is based on an optimization that minimizes the energy retained by the structure as a function of frequency distribution of the oscillators in the set. Linear energy sinks function not only under transient excitation but also harmonic and random noise excitation, and, thus, find broad range of applications. Experimental results demonstrate the viability of the concept of linear energy sinks.
İlker Murat Koç received his BSc and MSc degrees in Mechanical Engineering from
Turkey in 1996 and1998, respectively. He worked in a Mobile Spherical Robot Project for NASA at
University for a year in 2000. He completed his PhD in August 2006 at
University in which he worked as a Post Doctoral Researcher following his degree. Dr. Koç joined the Department of Mechanical Engineering at
University in April 2007 and he is currently working as an Assistant Professor in System Dynamics and Control division.
March 11, 2009, 13:40, FENS L055