The Frequency-Variable Rotor-Blade-Based Two-Degree-of-Freedom Actuation Principle for Linear and Rotary Motion

Area of Science:

• Mechanical Engineering
• Materials Science
• Robotics

Background:

• Traditional piezoelectric actuators have fixed intrinsic frequencies, limiting their actuation capabilities.
• Variable frequency actuation is crucial for enhancing performance, especially near low-frequency ranges.

Purpose of the Study:

• To propose and validate a novel frequency-variable linear and rotary motion (FVLRM) principle for two-degree-of-freedom driving.
• To enable actuators to operate with adjustable frequencies for improved industrial applications.

Main Methods:

• Developed frequency-variable piezoelectric oscillators (FVPO) where base frequency and vibration modes are adjustable by changing mass block parameters.
• Utilized simulations to recognize the variable-frequency principle of FVPO and experiments to verify the FVLRM principle.
• Tested a prototype actuator with adjustable mass block positions and operating frequencies.

Main Results:

• The FVLRM principle was successfully verified through simulations and experiments.
• Maximum linear motion of 3.52 mm/s and rotary motion of 286.9 mrad/s were achieved at second-order intrinsic frequencies (42 Hz and 43 Hz) with the mass block farthest.
• The actuator operates at frequencies below 60 Hz, offers adjustable natural frequency, and provides a large working stroke (140 mm linear, 360° rotation).

Conclusions:

• The proposed FVLRM principle effectively enables variable frequency piezoelectric actuation.
• This technology offers enhanced actuation capability and a larger working stroke for industrial applications requiring precise linear and rotary motion.