Nonlinear Targeted Energy Transfer in Mechanical and Structural Systems

This monograph evolved over a period of nine years from a series of papers and presentations addressing the subject of passive vibration control of mechanical s- tems subjected to broadband, transient inputs. The unifying theme is Targeted - ergy Transfer - TET, which represents a new and unique approach to the passive control problem, in which a strongly nonlinear, fully passive, local attachment, the Nonlinear Energy Sink - NES, is employed to drastically alter the dynamics of the primary system to which it is attached. The intrinsic capacity of the properly - signed NES to promote rapid localization of externally applied (narrowband) - bration or (broadband) shock energy to itself, where it can be captured and dis- pated, provides a powerful strategy for vibration control and the opens the pos- bility for a wide range of applications of TET, such as, vibration and shock i- lation, passive energy harvesting, aeroelastic instability (?utter) suppression, se- mic mitigation, vortex shedding control, enhanced reliability designs (for ex- ple in power grids) and others. The monograph is intended to provide a thorough explanation of the analytical, computational and experimental methods needed to formulate and study TET in mechanical and structural systems. Several prac- cal engineering applications are examined in detail, and experimental veri?cation and validation of the theoretical predictions are provided as well. The authors also suggest a number of possible future applications where application of TET seems promising. The authors are indebted to a number of sponsoring agencies.

This monograph presents theoretical methods, computational results and experimental demonstrations of this concept applied to discrete and continuous coupled nonlinear oscillators. It demonstrates the wide applicability of targeted nonlinear energy transfer.

The introduction to the International literature of the new concept of targeted nonlinear energy transfer, whereby unwanted vibration energy is transferred to preferential directions within a system, or to structural modes that are compatible to a set of requirements or design objectives

Preliminary Concepts, Methodologies and Techniques.- Nonlinear Targeted Energy Transfer in Discrete Linear Oscillators with Single-DOF Nonlinear Energy Sinks.- Targeted Energy Transfer in Discrete Linear Oscillators with Multi-DOF NESs.- Targeted Energy Transfer in Linear Continuous Systems with Single- and Multi-DOF NESs.- Targeted Energy Transfer in Systems with Periodic Excitations.- NESs with Non-Smooth Stiffness Characteristics.- Experimental Verification of Targeted Energy Transfer.- Suppression of Aeroelastic Instabilities through Passive Targeted Energy Transfer.- Seismic Mitigation by Targeted Energy Transfer.- Suppression of Instabilities in Drilling Operations through Targeted Energy Transfer.- Postscript.