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Related Concept Videos

Impact Strength of Concrete01:21

Impact Strength of Concrete

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Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Impact: Problem Solving01:26

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
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Impact01:30

Impact

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Sound radiation from impact-driven raked piles.

Daniel R Wilkes1, Alexander N Gavrilov1

  • 1Centre for Marine Science and Technology, Department of Imaging and Applied Physics, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.

The Journal of the Acoustical Society of America
|August 3, 2017
PubMed
Summary
This summary is machine-generated.

Sound emissions from raked piles show directional dependence. An equivalent axisymmetric model accurately predicts this sound field, simplifying acoustic modeling for impact pile driving.

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Area of Science:

  • Acoustics
  • Environmental Engineering
  • Computational Mechanics

Background:

  • Impact pile driving generates sound with directional characteristics.
  • Raked piles, due to their angled orientation, introduce azimuthal dependence in radiated sound fields.
  • Accurate prediction of underwater noise is crucial for environmental impact assessments.

Purpose of the Study:

  • To model and predict the sound radiation from impact pile driving of raked piles.
  • To investigate the azimuthal dependence of the sound field.
  • To develop an efficient modeling approach that avoids computationally expensive 3D models.

Main Methods:

  • Utilized a finite element method (FEM) model for the pile and near-field sound.
  • Employed a normal mode model to predict far-field sound radiation.
  • Developed an equivalent axisymmetric FEM model by matching radiated fields to phased point sources and offsetting locations.

Main Results:

  • The equivalent axisymmetric FEM model accurately predicted the azimuthal dependence of the radiated sound field.
  • This simplified model closely matched predictions from a fully 3D FEM model.
  • Numerical results were validated against acoustic measurements from Western Australia.

Conclusions:

  • An equivalent axisymmetric FEM model is an efficient and accurate method for predicting sound radiation from raked piles.
  • This approach simplifies complex acoustic modeling for underwater noise from pile driving.
  • The findings support improved environmental monitoring and mitigation strategies for marine construction.