Related Experiment Video
Updated: Jun 18, 2025
06:51
Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
7.0K
Broadband surface wave manipulation by periodic barriers in unsaturated soil
1Institute of Smart Materials and Structures, School of Civil Engineering, Beijing Jiaotong University , Beijing 100044, People's Republic of China.
Summary
Periodic wave barriers effectively mitigate surface waves in unsaturated soils by creating attenuation zones. This study reveals their mechanism and parameter effects, offering insights for vibration control in complex soil conditions.
Area of Science:
- Geophysics
- Soil Mechanics
- Acoustic Metamaterials
Background:
- Periodic wave barriers are established for elastic wave manipulation in saturated soils.
- Unsaturated soils present challenges for periodic barrier applications due to complex constitutive relationships.
Purpose of the Study:
- To investigate the manipulation of surface waves using periodic in-filled trench barriers in unsaturated soils.
- To determine dispersion relations and reveal the attenuation mechanism of evanescent surface waves.
Main Methods:
- Application of periodic theory to analyze surface wave propagation in unsaturated soils.
- Comprehensive analysis of key unsaturated soil parameters influencing barrier performance.
- Time-domain analysis to compare barrier performance in unsaturated and saturated soils.
Main Results:
- Dispersion relations for surface waves in unsaturated soils were determined.
- The attenuation mechanism of evanescent surface waves was elucidated.
- Viscosity of fluid can cause surface wave attenuation across the entire frequency range for specific material parameters.
Conclusions:
- Periodic in-filled trench barriers show promise for mitigating surface waves in unsaturated soils.
- The study provides a new understanding of surface wave manipulation using periodic barriers.
- Designed barrier performance was validated against field test data for train-induced vibrations.
Related Concept Videos
01:07Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K
01:28Standing Waves in a Cavity
897
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
897
01:10Wave Parameters
7.7K
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
7.7K
01:07Reflection of Waves
3.7K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
3.7K
01:04Travelling Waves
5.2K
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
5.2K
00:53Sound Waves: Interference
3.7K
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...
3.7K