The vibration behavior of a resonant system can be modified dramatically by the additional of one or more relatively small resonant substructures. The simplest example is a tuned mass damper, in which a single small element is added with a resonant frequency tuned to match that of the primary system. We consider the case of multiple elements added with prescribed distributions of properties (mass, stiffness, damping) to achieve a variety of effects in frequency or time domain. For example, the array of added elements can be designed to achieve bandpass or bandstop filter characteristics, or to create apparent damping by rapidly drawing energy from the primary system. Applications include vibration damping, radio frequency filtering, energy harvesting, and mass sensing. We explore the consequences of manufacturing imprecision on the effect(s) created by the substructure array.
Dr. John Judge was recently appointed as Dean of Engineering at the Catholic University of America, where he has been a faculty member in Mechanical Engineering for the past 13 years. Prior to that, he held a National Research Council postdoctoral fellowship at the Naval Research Laboratory. Dr. Judge earned his Bachelor of Science at Cornell University (1996) and his Master of Science (1998) and Ph.D. (2002) from the University of Michigan. His expertise is in vibration and dynamics of complex systems, in particular near-periodic structures such as mistuned turbomachinery stages and arrays of micromechanical resonators used for signal processing or ultrasensitive mass detection. He has also conducted research in seismic/acoustic detection of landmines and improvised explosives, acoustic imaging and acoustic propagation, and experimental characterization of structures and systems using acoustics and vibration measurements. His work has been funded by the Office of Naval Research, the Army Research Office, the U.S. Department of State, and a CAREER award from the National Science Foundation. He has won several awards for teaching including the Catholic University of America Provost’s Award for Teaching Excellence. He is a fellow of the ASME.
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