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Related Concept Videos

Equation of Motion: General Plane motion01:22

Equation of Motion: General Plane motion

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In the context of a rigid body's movement within a general plane, it is important to understand that this motion is typically triggered by external forces or couple moments exerted onto it. This principle can be explained through Newton's second law, which stipulates the translational motion of the body's center of mass along each axis.
Moreover, the body's center of mass experiences a rotational effect as a result of these couple moments. This rotation can be articulated as the...
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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.
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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Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

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Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
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Projectile Motion: Example01:18

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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on...
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Simple Harmonic Motion and Uniform Circular Motion01:42

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While simple harmonic motion and uniform circular motion may be two separate concepts, they correlate and interlink with each other. Simple harmonic motion is an oscillatory motion in a system where the net force can be described by Hooke's law, while uniform circular motion is the motion of an object in a circular path at constant speed.
There is an easy way to produce simple harmonic motion by using uniform circular motion. For instance, consider a ball attached to a uniformly rotating...
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Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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A Wearable Human Motion Tracking Device Using Micro Flow Sensor Incorporating a Micro Accelerometer.

Shi Qiang Liu, Jun Chang Zhang, Rong Zhu

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    Summary
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    This study introduces a wearable motion tracking device using a micro flow sensor and accelerometer to detect human limb postures during dynamic movements. The system accurately tracks motion and posture without cumulative errors, benefiting rehabilitation and training.

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    Area of Science:

    • Biomedical Engineering
    • Wearable Technology
    • Sensor Fusion

    Background:

    • Accurate human motion tracking is crucial for rehabilitation and athletic performance analysis.
    • Existing methods often face limitations in wearability, environmental restrictions, or error accumulation.

    Purpose of the Study:

    • To propose and validate a novel wearable human motion tracking device.
    • To enable accurate detection of limb postures during dynamic activities using micro flow sensors and accelerometers.

    Main Methods:

    • Integration of a micro flow sensor and micro accelerometer in a watch-type wearable device.
    • Estimation of motion acceleration from micro flow sensor velocity data.
    • Calculation of limb postures by subtracting estimated motion accelerations from accelerometer outputs.
    • Implementation of sensor data fusion using a Kalman filter.

    Main Results:

    • The device effectively detects motion velocity, motion acceleration, and human limb postures.
    • Experimental validation confirms the feasibility of human limb motion and posture measurements.
    • Measurements demonstrated to be free of accumulative errors.

    Conclusions:

    • The proposed flow-aid motion tracking device offers a practical and accurate solution for human motion analysis.
    • It is wearable, environment-independent, and suitable for long-term monitoring.
    • Potential applications include physical rehabilitation, intelligent prosthetics, and personal athletic training.