Semi-Active Vibration Controllers for Magnetorheological Fluid-Based Systems via Frequency Shaping ^†

Prof. Dr. Young Choi has served as Research Scientist in the Department of Aerospace Engineering at the University of Maryland at College Park. He received his B.S., M.S., and Ph.D. degrees in Department of Mechanical Engineering, Inha University in Korea in 1992, 1994, and 1999, respectively. He joined the Smart Structures Laboratory in the Alfred Gessow Rotorcraft Center in the University of Maryland in 1999. He has conducted the design, testing, and control of passive, semi-active, and active systems and structures with key components of smart materials such as magnetorheological fluids and piezoelectric materials. In addition, he has explored the design and analysis of novel energy harvesting devices using smart materials. He is co-inventor on 4 U.S. patents. He was awarded the ASME Adaptive Structure and Adaptive Materials Best Paper Award (2004). He was a leading member of the Boeing Rotorcraft Active Crash Protection System Development Team, which was awarded Harry T. Jensen Award (2011) from American Helicopter Society in recognition of an outstanding contribution to the improvement of helicopter reliability, maintainability or safety through improved design.

Prof. Dr. Norman M. Wereley is the Minta Martin Professor and former chair (2012-2021) of Aerospace Engineering at the University of Maryland. His research focuses on smart materials and structures, as well as composite and additively manufactured cellular materials and structures, for actuation and  occupant protection systems in aerospace and automotive applications. Dr. Wereley published extensively on these topics, including over 275 journal articles, and 22 patents. He was awarded the ASME Adaptive Structures and Material Systems Prize and the SPIE Smart Structures and Materials Lifetime Achievement Award. Dr. Wereley is a Fellow of AIAA, ASME, IOP, RAeS, SPIE and VFS, and a Lifetime Member of SAMPE. He holds the B.Eng. from McGill University, and M.S. and Ph.D. from Massachusetts Institute of Technology. He currently serves as co-Editor-in-Chief of Actuators and Editor-in-Chief of SAMPE Journal.

Dr. Gregory J. Hiemenz is a dynamic, versatile business leader with over a decade of experience in leading the development of new products and growing business. Prior to InnoVital Systems, Dr. Hiemenz served as Vice President of the Advanced Technologies Division at Techno-Sciences Inc. (TSI). During his tenure at TSI, Dr. Hiemenz spearheaded research and development of advanced technologies into military and commercial markets and was responsible for creating a new product line for protecting soldiers’ spines during IED blasts and helicopter crashes. He has worked closely with academia to evaluate and transition cutting-edge technologies into marketable products. He currently leads a highly-skilled, multi-disciplinary team of engineers while directing business development and proposal efforts, supervising personnel and staffing needs, managing intellectual property and business agreements, and performing market analyses for emerging technologies. Prior to joining TSI, Dr. Hiemenz spent several years as a major defense contractor serving as a technical specialist and integrated product team leader. Dr. Hiemenz graduated Summa Cum Laude with a B.M.E. in Mechanical Engineering at the Catholic University of America where he earned several awards for being the top-ranked student in the School of Engineering. He subsequently earned his M.S. and Ph.D. in Aerospace Engineering at UMD under a Graduate School Fellowship.