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Related Concept Videos

Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within the...
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Curvilinear Motion: Rectangular Components

Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...

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Bundle Block Adjustment with 3D Natural Cubic Splines.

Won Hee Lee1, Kiyun Yu

  • 1Department of Civil and Environmental Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea;

Sensors (Basel, Switzerland)
|February 4, 2012
PubMed
Summary
This summary is machine-generated.

Traditional photogrammetry relies on human operators and points. Digital photogrammetry requires advanced techniques using linear features for autonomous aerial triangulation, improving accuracy and geometric analysis.

Keywords:
3D natural cubic splinesarc-length parameterizationbundle block adjustmentline photogrammetrylinear features

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Area of Science:

  • Photogrammetry and Geomatics
  • Computer Vision
  • Geospatial Analysis

Background:

  • Traditional photogrammetry heavily relies on manual point-based methods, which are unsuitable for autonomous digital photogrammetry.
  • Existing autonomous systems face challenges with complex linear features in aerial triangulation.

Purpose of the Study:

  • To explore the use of higher-level linear features beyond discrete points for autonomous aerial triangulation.
  • To enhance the reliability and accuracy of digital photogrammetry techniques.

Main Methods:

  • Investigated the adoption of linear features (e.g., curves) for aerial triangulation in digital photogrammetry.
  • Utilized control points and break points for feature extraction and analysis.

Main Results:

  • Advanced algorithms enable accurate linear feature extraction, though complex curves present challenges.
  • The use of linear features facilitates the incorporation of geometric information.

Conclusions:

  • Employing higher-level features like linear elements increases the feasibility of geometric information utilization.
  • This approach provides access to analytical solutions suitable for advanced computer technology in autonomous photogrammetry.