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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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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

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Adjusting a Traverse01:12

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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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Leveling Equipment01:18

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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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Related Experiment Video

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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Automatic Guidance Method for Laser Tracker Based on Rotary-Laser Scanning Angle Measurement.

Linghui Yang1, Yuanlin Pan1, Jiarui Lin1

  • 1State Key Laboratory of Precision Measuring Technology and Instruments, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China.

Sensors (Basel, Switzerland)
|July 31, 2020
PubMed
Summary

This study introduces an automatic guidance method for laser trackers using rotary-laser scanning angle measurement. It enables precise, operator-independent target acquisition across a 360° field, improving efficiency in 3D coordinate measurements.

Keywords:
automatic guidancelaser trackerrotary-laser scanning

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Area of Science:

  • Metrology
  • Optical Engineering
  • Robotics

Background:

  • Laser trackers are crucial for large-scale 3D high-precision coordinate measurement.
  • Current visual guidance systems for laser trackers suffer from operator dependence, limited fields of view, and time-consuming processes.

Purpose of the Study:

  • To develop an automatic guidance method for laser trackers.
  • To overcome the limitations of existing operator-dependent visual guidance systems.

Main Methods:

  • A novel automatic guidance method based on rotary-laser scanning angle measurement technology is proposed.
  • A specialized target with six photoelectric receivers and a retroreflector is integrated with the laser scanning transmitter.
  • Real-time coordinate calculations provide target guidance within the laser tracker's system.

Main Results:

  • The experimental results confirm the successful automatic re-establishment of sightline.
  • The method achieves guidance within a horizontal 360° angle field with accuracy of tens of arc-seconds.
  • The proposed automatic guidance system demonstrates robustness against rapid target movement.

Conclusions:

  • The developed method enables automatic guidance for laser trackers, enhancing precision and efficiency.
  • This technology significantly reduces operator dependence and expands the operational field of view.
  • The system offers a robust solution for real-time 3D coordinate measurement applications.