Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Impedances and Admittance

Impedances and Admittance

In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...

Propagation of Waves

Propagation of Waves

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Homogenization of resonant bubble screens: Influence of bubble shape and lattice arrangement.

The Journal of the Acoustical Society of America·2026

Same author

Experimental characterization of the freezing of the transmitted pattern in a periodic waveguide.

The Journal of the Acoustical Society of America·2025

Same author

Broadband-omnidirectional absorption using inclined wiremesh gratingsa).

JASA express letters·2025

Same author

A nonreciprocal and tunable active acoustic scatterera).

The Journal of the Acoustical Society of America·2025

Same author

Invariance of the speckle pattern of the transmitted wave in periodic waveguides.

Scientific reports·2025

Same author

Loss-induced modal selection by a resistive wiremesh.

The Journal of the Acoustical Society of America·2024

Search research articles

Related Experiment Video

Updated: May 1, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Improved multimodal admittance method in varying cross section waveguides.

Agnès Maurel¹, Jean-François Mercier², Vincent Pagneux³

¹Institut Langevin, 1 rue Jussieu 75005 Paris, France.

Proceedings. Mathematical, Physical, and Engineering Sciences

|April 9, 2014

Summary

This study introduces an improved multimodal admittance method for acoustic waveguides. The enhanced approach uses a boundary mode for better convergence and superconvergence of scattered fields.

Keywords:

boundary mode impedance matrix multimodal method waveguide

More Related Videos

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Published on: March 19, 2016

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Related Experiment Videos

Last Updated: May 1, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Published on: March 19, 2016

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Area of Science:

Acoustics
Waveguide Theory
Computational Physics

Background:

Acoustic waveguides with varying cross sections present challenges for traditional analysis methods.
Accurate modeling of wave propagation is crucial for designing acoustic devices.
Convergence issues arise when using a limited number of transverse modes.

Purpose of the Study:

To present an improved multimodal admittance method for acoustic waveguides with varying cross sections.
To enhance the convergence rate with respect to the number of transverse modes considered.
To achieve superconvergence of the scattered acoustic field.

Main Methods:

An enriched modal expansion of the pressure field is employed.
The expansion includes N local transverse modes and one supplementary boundary mode.
The method utilizes the Riccati equation on the admittance matrix (Dirichlet-to-Neumann operator).

Main Results:

The improved method demonstrates enhanced convergence for the pressure field.
A superconvergence of the scattered field is observed outside the varying cross-section region.
The boundary mode component exhibits evanescent character in the coupled mode equations.

Conclusions:

The enhanced multimodal admittance method offers superior accuracy and efficiency for acoustic waveguide analysis.
The introduction of a boundary mode significantly improves convergence properties.
This method provides a robust framework for studying complex acoustic wave phenomena.