High speed displacement measurement based on electro-magnetic induction applied to electromagnetically driven ring...

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Electromagnetic forming (EMF) is a rapidly developing metal forming technology.
• Capturing high-speed deformation processes (up to 200 m/s) in EMF presents significant measurement challenges.
• Accurate displacement measurement is crucial for understanding EMF mechanisms and process optimization.

Purpose of the Study:

• To develop and validate a novel, high-speed displacement measurement method for electromagnetic forming.
• To address the limitations of existing techniques in capturing rapid transient events.
• To provide a practical and precise tool for analyzing the dynamics of EMF processes.

Main Methods:

• A new measurement system based on electromagnetic induction was designed, incorporating a printed circuit board (PCB) with eleven annular detecting probes.
• A Rogowski probe was utilized to simultaneously measure the current in the driving coil.
• The displacement of an expanding metal ring, a fundamental EMF process, was determined by analyzing induced voltages and coil current.

Main Results:

• The developed system demonstrated a high-speed response with adequate precision for measuring displacement.
• Induced voltages from the PCB probes and coil current from the Rogowski probe were effectively correlated with the ring's movement.
• Experimental validation confirmed the method's feasibility by comparing results with simultaneous high-speed camera recordings.

Conclusions:

• The novel electromagnetic induction-based method offers a viable solution for high-speed displacement measurement in electromagnetic forming.
• This technique provides a practical and precise approach to studying the complex dynamics of EMF.
• The findings contribute to a better understanding of EMF mechanisms and facilitate process optimization.