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Related Concept Videos

Harmonic Mean01:09

Harmonic Mean

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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Energy in Simple Harmonic Motion01:23

Energy in Simple Harmonic Motion

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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Simple Harmonic Motion01:21

Simple Harmonic Motion

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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Relative Risk01:12

Relative Risk

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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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Characteristics of Simple Harmonic Motion01:17

Characteristics of Simple Harmonic Motion

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The key characteristic of the simple harmonic motion is that the acceleration of the system and, therefore, the net force are proportional to the displacement and act in the opposite direction to the displacement. Additionally, the period and frequency of a simple harmonic oscillator are independent of its amplitude. For example, diving boards move faster or slower based on their thickness. A stiff, thick diving board has a large force constant, which causes it to have a smaller period, while a...
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Simple Harmonic Motion and Uniform Circular Motion01:42

Simple Harmonic Motion and Uniform Circular Motion

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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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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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A vehicle speed harmonization strategy for minimizing inter-vehicle crash risks.

Hyunjin Park1, Cheol Oh2

  • 1Transportation Research Division, Korea Expressway Corporation Institute, 208-96, Dongbu-daero 922beon-gil, Dongtan-myeon, Hwaseong-si, Gyeonggi-do 18489, Republic of Korea.

Accident; Analysis and Prevention
|May 10, 2019
PubMed
Summary

This study introduces a new speed control strategy for connected and automated vehicles (CAV) to reduce crash risks. The method uses a risk map to harmonize speeds, achieving a 50% crash potential reduction without impacting traffic flow.

Keywords:
Risk estimationRisk mapRisk minimizationSpeed controlVehicle trajectory data

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Area of Science:

  • Intelligent Transportation Systems
  • Automotive Engineering
  • Control Theory

Background:

  • Technological advancements in sensors, communication, and control systems enable speed harmonization for crash prevention.
  • Connected and automated vehicles (CAV) are central to developing advanced road safety measures.
  • Trajectory-level vehicle control is gaining importance in automated driving.

Purpose of the Study:

  • To propose a novel vehicle speed control strategy to minimize inter-vehicle crash risks in automated driving environments.
  • To develop a method for speed harmonization that enhances road safety.
  • To provide a foundation for future vehicle control systems aimed at crash prevention.

Main Methods:

  • A three-component methodology: risk estimation, risk map construction, and vehicle speed control.
  • Crash risks quantified using Fault Tree Analysis (FTA) to integrate occurrence potential and severity.
  • A crash risk map created by projecting integrated risk onto relative speed and relative spacing.

Main Results:

  • The proposed methodology effectively reduces inter-vehicle crash risks.
  • A significant reduction in crash potential (approximately 50%) was observed under specific conditions.
  • Operational performance of the traffic stream was maintained without loss.

Conclusions:

  • The developed speed control strategy enables effective speed harmonization for crash prevention in automated driving.
  • The methodology offers a comprehensive approach to analyzing and mitigating inter-vehicle risks.
  • The study's findings are valuable for advancing vehicle control systems in automated driving environments.