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Parametric Resonance Of A Repulsive Force Mems Electrostatic Mirror, Mehmet Ozdogan, Meysam Daeichin, Abdallah H. Ramini, Shahrzad Towfighian
Parametric Resonance Of A Repulsive Force Mems Electrostatic Mirror, Mehmet Ozdogan, Meysam Daeichin, Abdallah H. Ramini, Shahrzad Towfighian
Mechanical Engineering Faculty Scholarship
We investigate the nonlinear dynamic behavior of an electrostatic MEMS mirror. The MEMS mirror is driven by repulsive force actuators, which avoid pull-in instability and enable large travel ranges. In parallel-plate actuators, the force on the structure is toward the substrate limiting the range of motion to the capacitor gap. Unlike parallel-plate, repulsive force actuators push the mirror away from the substrate not limiting the motion. The highly nonlinear nature of the repulsive force and the large motions create unique characteristics that dier from parallel-plate actuators. Repulsive force actuators show linear natural frequency hardening with increased DC voltages unlike parallel-plate …
A Hybrid Nonlinear Vibration Energy Harvester, Wei Yang, Shahrzad Towfighian
A Hybrid Nonlinear Vibration Energy Harvester, Wei Yang, Shahrzad Towfighian
Mechanical Engineering Faculty Scholarship
Vibration energy harvesting converts mechanical energy from ambient sources to electricity to power remote sensors. Compared to linear resonators that have poor performance away from their natural frequency, nonlinear vibration energy harvesters perform better because they use vibration energy over a broader spectrum. We present a hybrid nonlinear energy harvester that combines bi-stability with internal resonance to increase the frequency bandwidth. A two-fold increase in the frequency bandwidth can be obtained compared to a bi-stable system with fixed magnets. The harvester consists of a piezoelectric cantilever beam carrying a movable magnet facing a fixed magnet. A spring allows the magnet …