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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.
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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 Axes - Acceleration01:22

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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.
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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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Principle of Linear Impulse and Momentum for a Single Particle: Problem Solving01:23

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Relative Motion Analysis - Velocity01:24

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Movement Coordination during Forward and Backward Rope Jumping: A Relative Phase Study.

Tianyi Wang, Daisuke Goto, Masanobu Manno

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 11, 2021
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    Summary

    Backward rope jumping shows worse movement coordination than forward jumping. This study used relative phase analysis to assess coordination in 78 students during forward and backward rope jumps.

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    Area of Science:

    • Biomechanics
    • Kinesiology
    • Sports Science

    Background:

    • Rope jumping is a common training method in athletics, fitness, and physical education.
    • Forward and backward rope jumping are used to assess athletic performance, requiring upper and lower limb coordination.
    • Previous research has not specifically investigated movement coordination during forward versus backward rope jumping.

    Purpose of the Study:

    • To investigate and compare movement coordination during forward and backward rope jumping using relative phase (RP) analysis.
    • To evaluate movement stability and phase trends (in-phase vs. out-of-phase) during different rope jumping techniques.

    Main Methods:

    • 78 elementary and junior high school students participated in the study.
    • iPhone video recordings of 30-second forward and backward rope jumping sessions were captured.
    • Pose estimation software tracked jump motions, and relative phase (RP) analysis was applied to quantify movement coordination.

    Main Results:

    • A significant difference in movement coordination was observed between forward and backward rope jumping.
    • Backward rope jumping demonstrated poorer movement coordination, a tendency towards out-of-phase movements, and reduced stability compared to forward jumping.
    • Analysis included 3994 forward and 3961 backward jumps, assessing metrics like absolute maximum RP and mean absolute RP.

    Conclusions:

    • This study provides the first analysis of movement coordination specifically during rope jumping.
    • Findings suggest that backward rope jumping requires more complex coordination and is less stable than forward jumping.
    • Further research into rope jumping coordination can inform athlete performance management, fitness programs, and physical education strategies.