1. The Research Problem
In one microactuator concept, bubbles of gas are formed at a Platinum Electrode.
Bubbles sticking to the electrode are expected to be a problem.
How can we get rid of bubbles?

2. A Possible Solution
Inducing vibrations, mechanically or electromagnetically, is a possible solution.
Resonant excitation is the most efficient technique to achieve large accelerations at the electrode surface.
What are the resonant modes and associated frequencies? FEM to the rescue.

3. Solution Process COMSOL Simulation Environment
Undamped Eigenfrequency Analysis
Pt electrode was modeled as a helix with a single fixed endpoint.

4. Eigenfrequency Analysis Results
Electrode Parameters
Pure Pt Wire
24AWG (F0.50mm)
Helix has centerline diameter F1.90mm
38 Revolutions
Length 26.1mm
One fixed end, one free end
Mode
Frequency (Hz) 1 2
20.894
20.913 3 4
129.86
129.96 5
353.47 6 7
358.83
360.11 8
392.83 9 10
690.37
690.62

5. Normal Modes 1 and 2

6. Normal Modes 3 and 4

7. Normal Mode 5

8. Normal Mode 8

12. Close Eigenstates