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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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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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Wheatstone Bridge01:29

Wheatstone Bridge

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An ohmmeter is a resistance-measuring device. It works by applying a voltage to a resistor of unknown resistance and measuring the current across the resistor. The resistance value is deduced using Ohm's law. Usually, the standard configuration of an ohmmeter comprises a voltmeter or an ammeter. However, such configurations are limited in accuracy because the meters alter the voltage applied to the resistor and the current that flows through it.
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Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Development of a Reference-Free Indirect Bridge Displacement Sensing System.

Jongbin Won1, Jong-Woong Park1, Junyoung Park1

  • 1Department of Civil and Environmental Engineering, Chung-Ang University, Dongjak, Seoul 06974, Korea.

Sensors (Basel, Switzerland)
|August 28, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel reference-free system for measuring bridge displacement using strain and accelerometers. The innovative method accurately assesses structural health, even on challenging bridges like those over water or highways.

Keywords:
accelerationdisplacement measurementreference-free displacementstrainwireless sensor

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Area of Science:

  • Structural Engineering
  • Geotechnical Engineering
  • Sensor Technology

Background:

  • Bridge displacement monitoring is crucial for structural health assessment and load capacity evaluation.
  • Conventional methods like linear variable differential transformers (LVDTs) require stable reference points, limiting their application on bridges over large bodies of water or highways.
  • Existing systems face challenges in monitoring tall bridges due to reference point limitations.

Purpose of the Study:

  • To propose and develop a reference-free, indirect bridge displacement sensing system.
  • To optimize an indirect displacement estimation method for structural monitoring.
  • To evaluate the performance and applicability of the developed system on various bridge types.

Main Methods:

  • Utilized a multichannel sensor board with strain and accelerometer sensors integrated with a commercial wireless sensor platform (Xnode).
  • Developed and optimized a reference-free indirect displacement estimation algorithm.
  • Conducted experimental evaluations on concrete and steel box girder bridges.

Main Results:

  • The proposed system achieved a maximum displacement error of 2.17% compared to reference LVDT data.
  • Successfully demonstrated application in displacement monitoring of a 20m tall bridge, overcoming limitations of existing systems.
  • The system proved effective for indirect displacement measurement and structural health evaluation.

Conclusions:

  • The developed reference-free indirect bridge displacement sensing system offers a viable alternative to conventional methods.
  • The system demonstrates high accuracy and adaptability for monitoring diverse bridge structures, including challenging environments and tall bridges.
  • This technology enhances the capability for continuous structural health monitoring and load-carrying capacity assessment of bridges.