Tri-directional piezoelectric energy harvester based on U-shaped beam-pendulum structure

Area of Science:

• Mechanical Engineering
• Materials Science
• Energy Harvesting

Background:

• Piezoelectric energy harvesting is crucial for powering low-power electronic devices.
• Existing harvesters often struggle with low-frequency vibrations and directional limitations.
• There is a need for devices capable of capturing ambient vibrational energy efficiently.

Purpose of the Study:

• To propose and validate a multi-direction piezoelectric energy harvester.
• To achieve a wide bandwidth and low working frequency for enhanced energy capture.
• To demonstrate adaptability in collecting energy from arbitrary ambient vibrations.

Main Methods:

• Utilizing a U-shaped beam with multiple working modes.
• Incorporating a pendulum for efficient collection of arbitrary vibrations.
• Employing finite element simulation for structural evaluation.
• Conducting experimental verification of the design's performance.

Main Results:

• The harvester demonstrates at least three distinct voltage peaks within the 0 Hz-25 Hz frequency range.
• Favorable energy harvesting consistency is achieved across different vibration directions.
• The device exhibits adaptability in capturing energy from diverse ambient vibrational sources.

Conclusions:

• The proposed multi-direction piezoelectric energy harvester effectively captures ambient vibrations.
• The design's unique structure enables wide bandwidth and low-frequency operation.
• This technology holds promise for self-powered sensors and portable electronics.