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Related Concept Videos

Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

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The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Related Experiment Video

Updated: Aug 5, 2025

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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Serially Connected Cantilever Beam-Based FBG Accelerometers: Design, Optimization and Testing.

Aarathy Ezhuthupally Reghuprasad1, Chiara Colombero1, Alberto Godio1

  • 1Department of Environment, Land, and Infrastructure Engineering (DIATI), Politecnico di Torino, 10129 Turin, Italy.

Sensors (Basel, Switzerland)
|March 30, 2023
PubMed
Summary
This summary is machine-generated.

Fiber Bragg grating (FBG) accelerometers were designed and optimized for seismic vibration measurement. Field tests confirmed their suitability for recording seismic traces and identifying arrival times, showing promise for seismic acquisition applications.

Keywords:
cantilever-based accelerometerfiber Bragg gratingsgeophonesseismograms

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Area of Science:

  • Geophysics
  • Sensor Technology
  • Materials Science

Background:

  • Fiber Bragg gratings (FBGs) offer advantages like multiplexing and electromagnetic immunity for sensor applications.
  • Cantilever beam designs are explored for enhanced sensitivity in vibration measurement.
  • Active seismic sources require robust and sensitive accelerometers for environmental monitoring.

Purpose of the Study:

  • To design, optimize, fabricate, and test fiber Bragg grating (FBG) cantilever beam-based accelerometers for measuring vibrations from active seismic sources.
  • To evaluate the influence of cantilever beam parameters on accelerometer performance using simulations and calibration.
  • To compare the performance of the developed FBG accelerometer with standard geophones in a field test.

Main Methods:

  • Finite Element Method (FEM) simulations were employed to analyze cantilever beam parameters and their effect on natural frequency and sensitivity.
  • Laboratory calibration using a vibration exciter was performed to validate simulation results.
  • Fabrication and packaging of polylactic acid (PLA)-based FBG accelerometers were conducted.
  • Field testing involved comparing the FBG accelerometer with a 4.5-Hz vertical geophone using active-source seismic shots.

Main Results:

  • FEM simulations and laboratory calibration demonstrated the influence of cantilever beam parameters on natural frequency and sensitivity.
  • The optimized FBG accelerometer achieved a resonance frequency of 75 Hz within a 5-55 Hz measuring range.
  • High sensitivity of ±433.7 pm/g was recorded for the optimized system.
  • Field tests showed the FBG accelerometer successfully recorded seismic traces and identified first arrival times, comparable to geophones.

Conclusions:

  • The designed FBG cantilever beam-based accelerometers are suitable for seismic acquisition and vibration measurement.
  • Optimization of cantilever beam parameters enhances accelerometer sensitivity and performance.
  • FBG accelerometers present a promising alternative to traditional geophones for active seismic surveys.
  • Further system optimization and implementation hold significant potential for advancing seismic data acquisition.