Dynamic Analysis of a Micro Beam-Based Tactile Sensor Actuated by Fringing Electrostatic Fields.

Area of Science:

• Microelectromechanical Systems (MEMS)
• Nonlinear Dynamics
• Electrostatic Actuation

Background:

• Fringing electrostatic forces are crucial in MEMS device operation.
• Understanding nonlinear dynamics is essential for precise micro-actuator design.
• Existing actuation modes may lack sensitivity or require complex analysis.

Purpose of the Study:

• To develop and analyze a new fringing electrostatic actuation mode.
• To investigate the nonlinear dynamic behaviors of a micro-actuated structure.
• To explore the application of this mode in micro tactile sensors for displacement measurement.

Main Methods:

• Derivation of fringing electrostatic force expression for the new mode.
• Nonlinear dynamic analysis using the Method of Multiple Scales.
• Experimental observation of dynamic behaviors and resonance characteristics.

Main Results:

• Resonance frequency increases with initial displacement and decreases with slit gap.
• Vibration amplitude shows a linear relationship with initial displacement.
• Fringing electrostatic force significantly impacts frequency response with larger initial displacement, beam length, and voltage.

Conclusions:

• The developed actuation mode is suitable for micro tactile sensors.
• Dynamic analysis results support the design of sensors based on this mode.
• Three distinct methods (resonance frequency, amplitude, jump phenomenon) are proposed for initial displacement measurement.