Self-Powered Z-Shaped Hybrid Triboelectric-Electromagnetic Vibration Sensor for Coal Mine Fracturing Condition...

Area of Science:

• Engineering
• Materials Science
• Geophysics

Background:

• Real-time vibration monitoring is essential for coal mine fracturing operations, but traditional sensors require external power, limiting their use.
• The harsh underground environment poses challenges for sensor reliability and operational efficiency.

Purpose of the Study:

• To develop a self-powered vibration sensor for monitoring coal mine fracturing drilling.
• To enable simultaneous vibration monitoring and energy harvesting in underground mining environments.

Main Methods:

• A Z-shaped sensor was designed using hybrid triboelectric (TENG) and electromagnetic (EMG) mechanisms.
• The sensor converts drilling tool vibrations into electrical signals for frequency analysis and energy generation.
• Performance was tested under high temperature (150 °C) and humidity (90% RH).

Main Results:

• The sensor demonstrated stable performance in extreme conditions.
• It accurately measured vibration frequencies from 0 to 11 Hz with <5% deviation.
• The TENG unit provided high-amplitude voltage signals for frequency identification, while the EMG unit harvested energy (peak power 110.5 mW).

Conclusions:

• The hybrid self-powered sensor effectively monitors vibration frequency during coal mine fracturing.
• It offers a reliable, self-sufficient solution for downhole equipment safety and operational optimization in underground mining.