Analysis of electrostatic levitation control system and oscillation method for material properties measurement

Area of Science:

• Materials Science
• Control Engineering

Background:

• Electrostatic levitation (ESL) is crucial for containerless material property studies.
• Sample charge uncertainty during ESL start-up and laser-melting causes instability.
• Traditional methods for measuring surface tension and viscosity in ESL require extra hardware.

Purpose of the Study:

• To develop a robust control strategy for electrostatic levitation systems.
• To introduce a novel, hardware-independent method for measuring material properties.
• To enhance the stability and accuracy of ESL experiments.

Main Methods:

• A two-step adaptive control strategy incorporating charge estimation and feed-forward control was designed.
• An innovative software-based method for superimposing oscillation signals was developed to measure surface tension and viscosity.
• A control system model with an accurate electric field model was established for simulation.
• Experiments utilized a high-speed vision-servo system for validation.

Main Results:

• The adaptive control strategy effectively mitigates disturbances caused by charge uncertainty.
• The software-based oscillation method provides flexible and accurate measurements of surface tension and viscosity without additional hardware.
• Simulations and experiments validated the enhanced stability and measurement capabilities of the proposed control strategies.

Conclusions:

• The designed adaptive control strategy significantly improves electrostatic levitation system performance.
• The novel oscillation superposition method offers a flexible and efficient approach to material property characterization in ESL.
• This research advances electrostatic levitation technology for more reliable material science investigations.