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Related Concept Videos

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...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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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 Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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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. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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Relative Motion Analysis - Acceleration01:10

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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Absolute Motion Analysis- General Plane Motion01:24

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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Modal Analysis Using Digital Image Correlation Technique.

Peter Frankovský1, Ingrid Delyová1, Peter Sivák1

  • 1Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia.

Materials (Basel, Switzerland)
|August 26, 2022
PubMed
Summary

This study introduces a novel method using digital image correlation (DIC) to determine modal parameters. The developed software module accurately calculates resonant frequencies and modal shapes for experimental modal analysis.

Keywords:
digital image correlation (DIC)experimental modal analysisfrequency response functionoperational modal analysis

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Area of Science:

  • Mechanical Engineering
  • Vibration Analysis
  • Optical Measurement Techniques

Background:

  • Accurate determination of modal parameters is crucial for structural health monitoring and performance optimization.
  • Traditional experimental modal analysis methods can be time-consuming and require physical contact.
  • Non-contact optical methods offer a promising alternative for precise displacement measurements.

Purpose of the Study:

  • To present a new experimental approach for determining modal parameters (resonant frequencies, modal shapes, damping coefficients).
  • To develop a practical software module for constructing frequency response functions (FRFs) from measured displacement data.
  • To validate the accuracy of the developed method against numerical simulations.

Main Methods:

  • Utilized digital image correlation (DIC) for non-contact, high-resolution displacement measurements.
  • Developed a Scilab application module to process 3D displacement data and generate FRFs.
  • Employed impact hammer excitation on a steel plate for experimental modal analysis.
  • Validated results using finite element analysis in Abaqus software.

Main Results:

  • Successfully constructed FRFs from DIC-measured displacement data.
  • Accurately determined modal parameters, including resonant frequencies and modal shapes.
  • Demonstrated high agreement between experimental results from the developed module and Abaqus simulations.
  • The developed application module provides a practical tool for experimental modal analysis.

Conclusions:

  • The proposed DIC-based approach offers an accurate and efficient method for experimental modal analysis.
  • The developed Scilab module effectively processes optical measurement data to extract critical modal parameters.
  • This technique provides a reliable alternative for modal parameter determination, validated by numerical simulations.