Low-Cost Piezoelectric Sensors for Time Domain Load Monitoring of Metallic Structures During Operational and...

Area of Science:

• Materials Science
• Mechanical Engineering
• Sensor Technology

Background:

• Piezoelectric sensors are gaining interest for structural and manufacturing monitoring due to their versatility.
• They offer advantages over strain gauges, including a wide operational temperature range, high accuracy, low power consumption, and cost-effectiveness.
• Integration into wireless sensor networks allows for direct embedding into machinery, fixtures, and tools.

Purpose of the Study:

• To investigate the application of piezoelectric sensors for real-time monitoring of mechanical strength in metallic structures.
• To assess the performance of piezoelectric sensors in the operational control of machinery components.
• To evaluate the ability of piezoelectric sensors to distinguish between different material types and thicknesses under flexural stress.

Main Methods:

• Utilized piezoelectric sensors, specifically lead zirconium titanate (PZT) sensors, to study aluminum and steel structures under flexural strength.
• Measured variations in structural behavior and geometry, quantifying load and microstrains in the time domain at specific frequencies.
• Explored frequency selection and optimization from 20 Hz to 300 kHz, assessing the influence of applied PZT voltage on power consumption and signal integrity.

Main Results:

• PZT sensors successfully distinguished between different material types and thicknesses of metallic structures.
• Significant differences in optimal operating frequencies and sensitivity were observed between aluminum and steel structures.
• Calibration to microstrains and loads was performed, demonstrating the sensors' quantitative measurement capabilities.

Conclusions:

• Piezoelectric sensors are effective for real-time mechanical strength monitoring of metallic structures in operational machinery.
• Optimized frequency selection and voltage control enhance sensor performance and reduce power consumption.
• The study validates piezoelectric sensors as a competitive alternative to traditional strain gauges for structural health monitoring.