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Related Concept Videos

Standing Waves in a Cavity01:28

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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:
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Sound Waves: Interference00:53

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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 Waves: Resonance01:14

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Design Example01:23

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Meta-Structure Hull Design with Periodic Layered Phononic Crystals Theory for Wide-Band Low-Frequency Sound

Fuxi Zhang1, Xinyi Sun1, Wei Tao1

  • 1College of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201306, China.

Materials (Basel, Switzerland)
|June 28, 2023
PubMed
Summary

Marine vehicle hulls can now mitigate low-frequency noise using novel meta-structure designs. This research introduces phononic crystal hulls for enhanced acoustic insulation, significantly reducing sound transmission.

Keywords:
Periodic Strato-Shaped Phononic Crystals (PSPC)acoustic metamateriallow-frequency isolationselective frequency tunneling

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Area of Science:

  • Marine Engineering
  • Acoustics
  • Materials Science

Background:

  • Conventional marine vehicle hulls effectively reduce airborne noise but struggle with low-frequency sound.
  • Low-frequency noise poses a challenge for acoustic insulation in marine applications.

Purpose of the Study:

  • To propose and evaluate a novel meta-structure laminar hull concept for enhanced sound insulation.
  • To optimize sound insulation performance on the air-solid interface of marine structures.

Main Methods:

  • Utilizing periodic layered phononic crystals in a meta-structure design.
  • Employing transfer matrix and acoustic transmittance analysis.
  • Experimental validation using 3D-printed samples.

Main Results:

  • Demonstrated ultra-low sound transmission between 50-800 Hz in a solid-air-solid meta-structure.
  • Identified two sharp tunneling peaks at 189 Hz and 538 Hz with low transmission magnitudes.
  • Experimental validation confirmed predicted tunneling peaks and wide-band mitigation.

Conclusions:

  • The proposed meta-structure laminar hull offers an effective solution for low-frequency acoustic mitigation in marine engineering.
  • The design provides a simple yet powerful method for acoustic band filtering.
  • This technique significantly enhances the acoustic insulation performance of marine structures.