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Related Concept Videos

Accelerators01:17

Accelerators

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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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Acceleration is in the direction of the change in velocity, but it is not always in the direction of motion. When an object slows down, its acceleration is opposite to the direction of its motion. Although commonly referred to as deceleration, this causes confusion in our analysis as deceleration is not a vector, and does not point to a specific direction with respect to a coordinate system. Therefore, the term deceleration is not used. For example, when a subway train slows down, it...
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In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the greater the acceleration, the greater the change in velocity over a given time. Since velocity is a vector, it can change in magnitude, direction, or both. Thus acceleration is a change in speed or direction, or both. For example, if a runner traveling at 10 km/h due east slows to a stop, reverses direction, and continues their run at 10 km/h...
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Design and Optimization Strategies of a High-Performance Vented Box
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Design Optimization of Bulk Piezoelectric Acceleration Sensor for Enhanced Performance.

Min-Ku Lee1, Seung-Ho Han1, Kyu-Hyun Park1

  • 1Sensor System Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Korea.

Sensors (Basel, Switzerland)
|August 3, 2019
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Summary

Optimizing piezoelectric acceleration sensor design involves balancing electric voltage and resonant frequency. Key design changes improved performance by over 46% in simulations.

Keywords:
accelerometerdesignfinite-element methodmetamodelpieoelectric sensorpiezoelectric analysis

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Area of Science:

  • Engineering
  • Materials Science
  • Physics

Background:

  • Bulk piezoelectric acceleration sensors are crucial for high-performance applications.
  • Optimizing sensor design is essential for enhancing performance metrics like electric voltage and resonant frequency.

Purpose of the Study:

  • To investigate design variables for bulk piezoelectric acceleration sensors.
  • To optimize sensor design using numerical simulations and metamodeling for improved performance.

Main Methods:

  • Numerical simulation incorporating piezoelectric analysis and metamodeling.
  • Investigation of design variables including base height, epoxy thickness, piezo element inner diameter, and head dimensions.

Main Results:

  • An exponential trade-off relationship was found between electric voltage and resonant frequency.
  • Decreasing base height and epoxy thickness, and increasing piezo element inner diameter positively impacted performance.
  • Head dimensions negatively affected both electric voltage and resonant frequency.

Conclusions:

  • Optimal sensor designs were proposed within a specific resonant frequency range (25-47.5 kHz).
  • Redesign of a commercial sensor yielded significant improvements: 13.2% in resonant frequency and 46.1% in electric voltage.