Multifrequency operation of microelectromechanical vibration energy harvesting by accessing principal and higher order parametric resonance Seminar
- Time:
- 16:00
- Date:
- 21 February 2017
- Venue:
- University of Southampton, Highfield Campus, 13/3017
For more information regarding this seminar, please email Rameen Mustafa at R.Mustafa@soton.ac.uk .
Event details
EngEnv - ISVR Seminar Series
The mechanical amplification effect of parametric resonance has the potential to outperform direct resonance by over an order of magnitude in terms of power output. However, the excitation must first overcome the damping-dependent initiation threshold amplitude prior to accessing this more profitable region. In addition to activating the principal (1st order) parametric resonance at twice the natural frequency ω_0, higher orders of parametric resonance may also be accessed when the excitation frequency is in the vicinity of 2ω_0/n for integer n. This is especially true when the concept is realised in micro-scales through microelectromechanical system (MEMS) technology, where up to 28 orders of parametric resonance have been observed to date.
By combining novel passive design topologies and vacuum packaging to minimise air damping, the initiation threshold is reduced to more practical levels and higher orders can be revealed. Additionally, unlike direct resonance, both the amplitude and the frequency bandwidth of the parametric resonant regimes increase with lower damping. Therefore, this alternative resonant approach provides a fundamentally superior vibratory approach to accumulate ambient kinetic energy.
Speaker information
Yu Jia, University of Chester. Yu Jia received a First Class (Honours) in MEng Electromechanical Engineering from the University of Southampton in 2010, and PhD in Engineering from the University of Cambridge in 2014. He was then a Research Associate at Cambridge for a year. He is currently a Lecturer in Mechanical Engineering at the University of Chester, leads the Smart Microsystems Research Group and is a Visiting Academic at the University of Cambridge. His research interests include vibration energy harvesting, micro-electromechanical systems, nonlinear vibration dynamics and smart integrated systems. He is a co-founder of 8power Ltd. and is a steering board member of the Energy Harvesting Network.