Session: VIB-04-01

Paper Number: 141260

141260 - Mass-Conserved Bandgap Engineering of Metastructures for Vibration Control 

Metastructures are a type of architected material that have shown to be effective for passive, low frequency vibration control. The vibration attenuation characteristics for metastructures is achieved using bandgap mechanisms of Bragg scattering resulting from structural periodicity and local resonance effects from the addition of a local resonator. Existing methods of design for metastructures for vibration control, especially methods utilizing local resonators, add mass to the system which is undesirable for many engineering applications, including those in the automotive and aerospace industries where mass considerations directly impact the efficiency of the system. This leads us to the motivation for this work, which is to develop metastructures for the purpose of vibration suppression without adding additional mass to the system, and this study investigates the conditions required to design mass-conserved, rod-type metastructure systems with tailored bandgap regions. The bandgap performance of the mass-conserved system is compared to a traditional, added-mass metastructure system, and results show that bandgap regions can be designed without adding mass to the overall system and identifies critical design parameters in order to achieve effective mass-conserved bandgap engineering compared to existing metastructures designs. The developed method of mass-conserved metastructure design is also shown to be effective when applied to additional methods of bandgap tuning that further enhance the bandgap regions, including the use of  multiple-degree-of-freedom resonators. For each mass-conserved metastructure design, the resulting bandgap regions are analyzed and design considerations are discussed.

Presenting Author: Greta Colford University of Michigan

Presenting Author Biography: Greta Colford is PhD Candidate at the University of Michigan in the Mechanical Engineering Department. She is advised by Dr. Kon-Well Wang of the Structural Dynamics and Controls Lab (SDCL), and Dr. Dan Inman of the Adaptive, Intelligent, and Multifunctional Structures (AIMS) Lab. Her research work focuses on designing mechanical metamaterials for vibration control applications.

Authors:

Greta Colford University of Michigan
Kon-Well Wang University of Michigan
Daniel Inman University of Michigan