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Awards

Brian R. Mace Kai Tao

Biography Biography

Brian R. Mace is Professor of Mechatronics in the Department of Kai Tao (M’16) received the B.Eng. degree in microelectronics from Central
Mechanical Engineering, University of Auckland, which he re-joined in South University in 2009, the M.Eng. degree in microelectronics from
2011. Prior to that he was Professor of Structural Dynamics at the Institute Shanghai Jiao Tong University in 2012, and the Ph.D. degree from
of Sound and Vibration Research (ISVR), University of Southampton. He Nanyang Technological University in 2016. He was a Post-Doctoral
graduated MA (Hons) and DPhil (1977) in Engineering Science from the Research Associate/Fellow for the Singapore-MIT Alliance for Research
University of Oxford. Following that he was Research Fellow at the ISVR and Technology Project from 2015 to 2017. He is currently an Associate
(1977–1980), Lecturer in the Department of Civil and Structural Professor with the Department of Mechanical Engineering, Northwestern
Engineering, University College, Cardiff, Wales (1980–1983) and then Polytechnical University. His research interest includes NEMS/MEMS
moved to the University of Auckland, returning in 2000 to the ISVR. His fabrication, micro energy harvesting, and self-powered MEMS devices.
research interests concern structural dynamics, vibrations, acoustics,
smart structures and dynamics. including uncertainty modelling and Lihua Tang
wave-based approaches. Interests outside work include fishing, bridge,
golf and walking.

2019 MATERIALS AND SYSTEMS BEST PAPER AWARDS Biography

Investigation of Multimodal Electret-Based MEMS Energy Harvester Lihua Tang received the B.Eng. degree in engineering mechanics and the
With Impact Induced Nonlinearity M.Eng. degree in solid mechanics from Shanghai Jiao Tong University,
China, in 2005 and 2008, respectively, and the Ph.D. degree in structures
Journal of Microelectromechanical Systems, Vol. 27, No. 2, April, 2018 and mechanics from Nanyang Technological University, Singapore, in
2012. He is currently a Senior Lecturer with the Department of Mechanical
Abstract Engineering, University of Auckland, New Zealand. He has published over
70 peer-reviewed journal and conference papers. His research interests
This paper presents an electret-based MEMS energy harvester include energy harvesting, smart materials and structures, vibration and
synergizing the advantages of multi-modal structure and impact noise control, nonlinear dynamics, acoustic metamaterials, and MEMS. He
mechanism for broad operating bandwidth. The device with a volume of currently serves on the ASME Energy Harvesting Technical Committee
295 mm³ comprises an electret-based primary subsystem for power and the ASME Adaptive Structures and Material Systems Technical
generation and an electrode-free auxiliary subsystem for frequency Branch.
tuning. The tiny auxiliary subsystem helps to induce close resonances with
comparable outputs at low excitations, as well as introduces impact-based
nonlinearity to drive the first resonant peak upward and further approach
the second one at elevated excitations. The experimental results
demonstrate that at an excitation of 12.8 m/s², the 3-dB bandwidth of the
first peak is increased from 20.4 to 60.4 Hz and a low frequency ratio of
1.15 between the two peaks is achieved. The two degree-of-freedom
resonant structure with impact-based nonlinearity is systematically
investigated through an equivalent circuit representation. An electrical
equivalent circuit model of the proposed device with impact mechanism is
derived. The circuit simulation confirms the nonlinear behavior of the
system, and reveals the mechanism of peak shifting and bandwidth
enhancing dynamics.

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