Presented By: Aerospace Engineering
AE585 Graduate Seminar Series - Metastructures for Vibration Suppression
Professor Dan Inman, Department Chair, Aerospace Engineering, University of Michigan
Daniel J. Inman, Clarence "Kelly" Johnson Professor
Aerospace Engineering Professor and Department Chair
University of Michigan
Metastructures, as used here, refers to a metamaterial inspired concept, and are structures with distributed vibration absorbers arranged in a repeated lattice type arrangement. In aerospace applications, it is critical to have low levels of vibrations while also using lightweight materials and metastructure approach provides the potential for adding damping and absorption to structural systems without adding a lot of added mass. Several issues will be discussed. First is the issue of weight. The second issue is the classic issue resolving the difference between damping and absorption. This issue arises because many of the metastructures reported in the literature are 3D printed with polymers, which of can be heavily damped. Thus it is not clear in some reported results whether the energy is dissipating through damping or is the result of vibration absorption. The last issue considered is one of adding feedback control to a metastructure design by using the piezoelectric effect. Once control is added to the structure a totally temperature independent highly, damped structure can be designed which is both lightweight and has excellent vibration suppression properties across a wide range of temperatures.
About the speaker...
Daniel J. Inman received his Ph.D. from Michigan State University in Mechanical Engineering in 1980 and is Chair of the Department of Aerospace Engineering at the University of Michigan, as well as the C. L. “Kelly” Johnson Collegiate Professor. Since 1980, he has published eight books (on vibration, energy harvesting, control, statics, and dynamics), eight software manuals, 20 book chapters, over 350 journal papers and 600 proceedings papers, given 62 keynote or plenary lectures, graduated 62 Ph.D. students and supervised more than 75 MS degrees. He works in the area of applying smart structures to solve aerospace engineering problems including energy harvesting, structural health monitoring, vibration suppression and morphing aircraft. He is a Fellow of AIAA, ASME, IIAV, SEM and AAM.
Aerospace Engineering Professor and Department Chair
University of Michigan
Metastructures, as used here, refers to a metamaterial inspired concept, and are structures with distributed vibration absorbers arranged in a repeated lattice type arrangement. In aerospace applications, it is critical to have low levels of vibrations while also using lightweight materials and metastructure approach provides the potential for adding damping and absorption to structural systems without adding a lot of added mass. Several issues will be discussed. First is the issue of weight. The second issue is the classic issue resolving the difference between damping and absorption. This issue arises because many of the metastructures reported in the literature are 3D printed with polymers, which of can be heavily damped. Thus it is not clear in some reported results whether the energy is dissipating through damping or is the result of vibration absorption. The last issue considered is one of adding feedback control to a metastructure design by using the piezoelectric effect. Once control is added to the structure a totally temperature independent highly, damped structure can be designed which is both lightweight and has excellent vibration suppression properties across a wide range of temperatures.
About the speaker...
Daniel J. Inman received his Ph.D. from Michigan State University in Mechanical Engineering in 1980 and is Chair of the Department of Aerospace Engineering at the University of Michigan, as well as the C. L. “Kelly” Johnson Collegiate Professor. Since 1980, he has published eight books (on vibration, energy harvesting, control, statics, and dynamics), eight software manuals, 20 book chapters, over 350 journal papers and 600 proceedings papers, given 62 keynote or plenary lectures, graduated 62 Ph.D. students and supervised more than 75 MS degrees. He works in the area of applying smart structures to solve aerospace engineering problems including energy harvesting, structural health monitoring, vibration suppression and morphing aircraft. He is a Fellow of AIAA, ASME, IIAV, SEM and AAM.
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