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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
422
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
854
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

675
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.
Here, in order to determine the magnitude of velocity and acceleration for point...
675
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

343
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

813
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
813
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

678
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
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A UAV Vision-Based Deformation Monitoring Method with 3D Scale Constraints.

Jianlin Liu1,2, Jun Wu3, Wujiao Dai2

  • 1National Engineering Research Center of High-Speed Railway Construction Technology, Changsha 410075, China.

Sensors (Basel, Switzerland)
|December 31, 2025
PubMed
Summary

This study introduces a 3D scale constraint method for Unmanned Aerial Vehicle (UAV) vision-based deformation monitoring, enhancing accuracy in large areas. The new approach significantly improves horizontal, elevation, and overall 3D deformation monitoring precision.

Keywords:
3D scaleUAVdeformation monitoringvision measurement

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Area of Science:

  • Geomatics Engineering
  • Photogrammetry
  • Geodetic Monitoring

Background:

  • UAV vision-based 3D deformation monitoring faces accuracy challenges due to low-quality imagery and imprecise control points, causing scale discrepancies.
  • Existing methods struggle with scale differences between survey models and real-world conditions, impacting large-scale monitoring precision.

Purpose of the Study:

  • To develop a spatial 3D scale for high-precision scale information in UAV monitoring.
  • To propose a UAV vision-based deformation monitoring method incorporating 3D scale constraints to improve accuracy.

Main Methods:

  • Development of a novel spatial 3D scale to provide accurate scale references.
  • Implementation of a UAV vision-based monitoring technique integrating these 3D scale constraints.

Main Results:

  • The proposed method demonstrated significant accuracy improvements over traditional control point methods.
  • Achieved RMSE improvement rates of 38.6% (horizontal) and 48.1% (elevation) across four UAV operation phases.
  • Maintained an approximate 42.3% improvement in 3D deformation accuracy (RMSE) over seven phases.

Conclusions:

  • The developed 3D scale constraint method effectively enhances the accuracy of UAV vision-based 3D deformation monitoring.
  • The method proves reliable for large-scale survey areas, overcoming limitations of low-quality images and control points.