Related Experiment Video
Updated: Aug 30, 2025
09:10
Fabrication and Testing of Microfluidic Optomechanical Oscillators
Published on: May 29, 2014
12.3K
Structural Design and Testing of a Micromechanical Resonant Accelerometer.
Heng Liu1, Yu Zhang1, Jiale Wu1
1School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Micromachines
|August 26, 2022
Summary
Researchers developed a tunable micro-mechanical resonant accelerometer. They established a dynamic model and fabricated silicon microstructures, achieving high sensitivity tunable by voltage, crucial for microstructure design.
Area of Science:
- MEMS (Micro-Electro-Mechanical Systems)
- Solid-state physics
- Mechanical engineering
Background:
- Micromechanical resonant accelerometers offer adjustable sensitivity via detection voltage.
- High-order nonlinearities between output frequency and acceleration complicate microstructure design.
Purpose of the Study:
- Establish a dynamic equation for electrostatic stiffness-based accelerometers.
- Investigate the relationship between design parameters, sensitivity, and voltage.
- Develop a numerical simulation model for improved accelerometer design.
Main Methods:
- Derived the dynamic equation considering beam stiffness ratios.
- Fabricated silicon microstructures with vacuum packaging.
- Conducted experimental tests to measure sensitivity and observe voltage-dependent phenomena.
Main Results:
- Achieved a sensitivity of 44.5 Hz/g at 1V detection voltage, increasing to over 300 Hz/g at 3V.
- Observed coupling between vibration amplitude and frequency with increased voltages.
- Identified structural failure of the double-stage folded beam above 10V detection voltage.
Conclusions:
- The dynamic model provides a theoretical basis for designing electrostatic stiffness-based accelerometers.
- Sensitivity is effectively tunable with detection voltage, but higher voltages introduce coupling and potential failure.
- A validated numerical simulation model supports closed-loop control circuit design.
