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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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Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
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Measurements of Strain01:27

Measurements of Strain

617
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Stress-Strain Diagram01:10

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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Analysis of Stability and Variability in Sensor Readings from a Vehicle Weigh-in-Motion Station.

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Strain Gauge Calibration for High Speed Weight-in-Motion Station.

Agnieszka Socha1, Jacek Izydorczyk2

  • 1APM PRO sp. z o.o., 43-300 Bielsko-Biała, Poland.

Sensors (Basel, Switzerland)
|August 10, 2024
PubMed
Summary

High-speed weight-in-motion (HSWIM) systems can now automatically enforce regulations. Replacing calibration coefficients with functions improved accuracy for direct enforcement, requiring only algorithm changes.

Keywords:
calibration functioncalibration of weigh-in-motion stationsdirect enforcementhigh speed weigh-in-motion (HSWIM)strain gauges

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Area of Science:

  • Engineering
  • Transportation Science
  • Metrology

Background:

  • Automatic enforcement of traffic regulations requires accurate vehicle weighing systems.
  • High-speed weight-in-motion (HSWIM) systems offer non-disruptive traffic monitoring.
  • Strain gauge sensors are commonly used for measuring vehicle weight in motion.

Purpose of the Study:

  • To enhance the calibration of HSWIM systems for improved accuracy in vehicle weight measurement.
  • To propose a novel calibration method using functions instead of coefficients.
  • To evaluate the impact of different wheel load determination methods on weighing accuracy.

Main Methods:

  • Developed and applied calibration functions to replace traditional calibration coefficients for HSWIM systems.
  • Analyzed two methods for determining wheel loads: signal maximum and area under the signal combined with vehicle speed.
  • Determined calibration functions both collectively for all vehicles and individually for specific vehicle types.

Main Results:

  • Utilizing vehicle-specific calibration functions significantly improved the accuracy of wheel pressure and gross weight determination.
  • The enhanced calibration method allowed HSWIM stations to meet the accuracy requirements for direct enforcement systems.
  • No physical modifications to the weighing station were necessary; only algorithmic adjustments were required.

Conclusions:

  • The proposed calibration function approach offers a more accurate method for HSWIM systems.
  • This method enables HSWIM systems to be classified as direct enforcement systems.
  • Algorithmic improvements in load determination are key to enhancing HSWIM accuracy without hardware changes.