A Linear Piezoelectric Actuator Using "A-Shaped" Structure.

Area of Science:

• Mechanical Engineering
• Materials Science
• Electrical Engineering

Background:

• Traditional piezoelectric actuators often require complex frequency degeneration mechanisms.
• Existing designs may lack adaptability for diverse application conditions.
• There is a need for compact, high-performance linear piezoelectric actuators.

Purpose of the Study:

• To propose, design, fabricate, and test a novel linear piezoelectric actuator with an "A-shaped" structure.
• To demonstrate an actuator design that utilizes the first bending vibration of a piezoelectric transducer.
• To evaluate the performance of the actuator under varying preload conditions.

Main Methods:

• A fusion design approach integrating piezoelectric transducer and mechanical structure was employed.
• The actuator operates by stimulating the first bending vibration of the center piezoelectric transducer.
• Experimental testing was conducted under a 120 N vertical preload.

Main Results:

• The "A-shaped" actuator achieved a maximum thrust force of 9.8 N and maximum output power of 0.62 W.
• The actuator exhibits high thrust density (160.6 N/kg) and power density (10.2 W/kg) relative to its 0.061 kg weight.
• The design eliminates the need for frequency degeneration, allowing for parameter adjustment.

Conclusions:

• The proposed "A-shaped" linear piezoelectric actuator offers a simplified and effective design.
• The actuator demonstrates excellent performance metrics, including high thrust and power density.
• This design provides enhanced adaptability for various application requirements.