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Related Concept Videos

Projectile Motion01:20

Projectile Motion

30.7K
An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
When an object falls under gravity and has no...
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Projectile Motion: Example01:18

Projectile Motion: Example

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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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Motion of a Projectile01:23

Motion of a Projectile

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Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.
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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.
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 - 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

Relative Motion Analysis - Acceleration

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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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Function Extension Based Real-Time Wavelet De-Noising Method for Projectile Attitude Measurement.

Zhihong Deng1, Jinwen Wang1, Xinyu Liang1

  • 1School of Automation, Beijing Institute of Technology, Beijing 100081, China.

Sensors (Basel, Switzerland)
|January 8, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new real-time wavelet de-noising method for projectile attitude measurement. The technique improves signal accuracy and reduces errors, ensuring reliable guidance systems.

Keywords:
function extensionprojectile attitude measurementreal-timewavelet de-noising

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Area of Science:

  • Aerospace Engineering
  • Signal Processing
  • Guidance Systems

Background:

  • Real-time projectile attitude measurement is crucial for guidance systems.
  • Gyro signal de-noising accuracy and real-time performance are critical due to high dynamic projectile motion.
  • Conventional extension methods for wavelet de-noising suffer from nonlinear discontinuity.

Purpose of the Study:

  • To propose a novel function extension real-time wavelet de-noising method for gyro signals.
  • To address the limitations of traditional extension methods in real-time de-noising applications.
  • To enhance the accuracy and real-time performance of projectile attitude measurement.

Main Methods:

  • Established a gyro signal prediction model based on the Roggla formula.
  • Implemented a sliding window fitting approach for signal prediction.
  • Utilized the predicted signal to achieve right boundary extension for wavelet de-noising.

Main Results:

  • The proposed method significantly increased the signal-to-noise ratio (SNR) and signal smoothness.
  • Attitude Mean Absolute Error (AMAE) and Attitude Root Mean Square Error (ARMSE) were effectively reduced.
  • The time delay associated with signal de-noising was minimized, ensuring real-time performance.

Conclusions:

  • The function extension real-time wavelet de-noising method offers superior performance compared to traditional techniques.
  • This approach enhances the accuracy and reliability of projectile attitude measurement.
  • The method effectively overcomes the challenges of real-time de-noising in dynamic environments.