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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

662
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...
662
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

545
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...
545
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

398
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.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

534
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...
534
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

538
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.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
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Gyroscope: Precession01:24

Gyroscope: Precession

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Related Experiment Video

Updated: Nov 19, 2025

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

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Head motion classification using thread-based sensor and machine learning algorithm.

Yiwen Jiang1, Aydin Sadeqi1,2, Eric L Miller3

  • 1Department of Electrical and Computer Engineering, Tufts University, 161 College Ave, Medford, MA, 02155, USA.

Scientific Reports
|January 30, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel head motion tracking system using neck-worn strain sensing threads. The flexible, cost-effective interface achieves 92% accuracy for classifying nine head orientations, aiding rehabilitation and virtual reality applications.

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Area of Science:

  • Biomedical Engineering
  • Human-Computer Interaction
  • Wearable Technology

Background:

  • Human-machine interfaces (HMIs) are crucial for advancements in physical rehabilitation, augmented reality (AR), virtual reality (VR), and behavioral studies.
  • Accurate and unobtrusive head motion tracking is essential for these applications.

Purpose of the Study:

  • To develop and evaluate a novel head position monitoring and classification system.
  • To assess the system's accuracy, flexibility, ease of use, and cost-effectiveness.

Main Methods:

  • Utilized thin, flexible strain sensing threads placed on the neck.
  • Integrated a wireless circuit module for impedance readout and Bluetooth transmission.
  • Developed a data processing algorithm for near real-time motion recognition, including filtering, normalization, and feature extraction.
  • Employed nine classifiers (e.g., Support Vector Machine, Naive Bayes, KNN) for head orientation prediction.

Main Results:

  • Achieved a testing accuracy of approximately 92% for classifying nine distinct head orientations.
  • Demonstrated the system's capability for near real-time quantification of head position.

Conclusions:

  • The developed human-machine interface platform is accurate, flexible, user-friendly, and cost-effective.
  • This system shows significant potential for enhancing physical rehabilitation, AR/VR experiences, and human behavior research.