Event Date
Speaker
Daniel J. Inman, Professor, University of Michigan
Abstract
Vibration mitigation permeates most aerospace structures. Current mitigation solutions involve adding mass to the structure an undesirable aspect for aerospace systems. Metastructures have excellent vibration mitigation and control properties. Here we investigate the use of a mass conserved concept of using metastructures for reducing vibrations and, in the case of aircraft, provide flow control. The mass conserved concept is to essentially redistribute the structural mass of an aerospace system to form a metamaterial array. Mechanical metamaterials, also known as metastructures, consist of a grouping of resonators, or vibration absorbers, in a repeated arrangement. Each resonator is called a unit cell. Tuning the frequencies of the unit cell can create gaps in the frequency spectrum, which in turn can be used to manipulate vibration and flow properties. Two applications are considered. The first is suppression of reaction-wheel-induced micro-vibration in CubeSat optical payloads. The second application is to vibration suppression and flow control of an aircraft wing.
Bio
Daniel J. Inman received his Ph.D. from Michigan State University in Mechanical Engineering in 1980 and is the Harm Buning Collegiate Professor and former Chair of the Department of Aerospace Engineering at the University of Michigan. Since 1980, he has published eight books (on vibration, energy harvesting, control, statics, and dynamics), eight software manuals, 20 book chapters, over 425 journal papers and 690 proceedings papers, given 79 keynote or plenary lectures, graduated 71 Ph.D. students, and supervised more than 75 MS degrees. He works in the areas of applying smart materials and structures to solve aerospace engineering problems including energy harvesting, structural health monitoring, vibration suppression and morphing aircraft. He is a Fellow of the American Institute of Aeronautics and Astronautics, American Society of Mechanical Engineers, International Instituted for Acoustics and Vibrations, Society of Experimental Mechanics and American Academy of Mechanics. He holds the 2000 ASME Adaptive Structures Award, the 2003 SPIE Smart Structures and Materials Lifetime Achievement Award, the ASME Den Hartog Award for lifetime achievement in teaching and research in vibration, the 2009 Lifetime Achievement award in Structural Health Monitoring, the 2014 AIAA Structures, Structural Dynamics, and Materials Award and elected to Honorary Member of ASME in 2026. He served as the Editor-in-Chief of the Journal of Intelligent Material Systems and Structures (1999-2024) and the Journal of Vibration and Acoustics (1989-1999).