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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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A vision-based dynamic rotational angle measurement system for large civil structures.

Jong-Jae Lee1, Hoai-Nam Ho, Jong-Han Lee

  • 1Department of Civil and Environmental Engineering, Sejong University, Seoul 143-747, Korea. jongjae@sejong.ac.kr

Sensors (Basel, Switzerland)
|September 13, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a cost-effective vision-based system for measuring rotational angles in large civil structures. The new system utilizes commercial components and image processing, achieving high accuracy with less than 1.0% error.

Keywords:
displacement measurementflexible structuresrotation anglevision-based system

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Area of Science:

  • Structural Engineering
  • Computer Vision
  • Measurement Systems

Background:

  • Existing rotational angle measurement systems for large structures are often complex and expensive.
  • There is a significant demand for high-resolution, cost-effective alternatives.

Purpose of the Study:

  • To develop and validate a novel vision-based rotational angle measurement system for civil structures.
  • To offer an affordable, high-resolution solution compared to traditional methods.

Main Methods:

  • The system employs commercial PCs, camcorders, low-cost frame grabbers, and a wireless LAN router.
  • Image processing techniques and pre-measured calibration parameters are used for angle calculation.

Main Results:

  • Laboratory tests demonstrated excellent agreement with commercial systems, showing an error of less than 1.0%.
  • Feasibility was experimentally verified on a five-story modal testing tower with a hybrid mass damper.

Conclusions:

  • The proposed vision-based system is a feasible, accurate, and cost-effective solution for monitoring rotational angles in large civil structures.
  • This technology offers a promising alternative for structural health monitoring applications.