Related Experiment Video
Updated: Jun 7, 2026
09:53
Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
Published on: May 13, 2018
Analytical prediction of break-out noise from a reactive rectangular plenum with four flexible walls
B Venkatesham1, Mayank Tiwari, M L Munjal
1Department of Mechanical Engineering, Facility for Research in Technical Acoustics, Indian Institute of Science, Bangalore-560012, India.
The Journal of the Acoustical Society of America
|October 26, 2010
Summary
This study presents an analytical method for predicting breakout noise from flexible-walled plenums. It incorporates acoustic-structural wave coupling for accurate transverse transmission loss prediction.
Area of Science:
- Acoustics
- Structural Dynamics
- Noise Control Engineering
Background:
- Breakout noise from rectangular plenums is a significant concern.
- Predicting noise transmission requires understanding acoustic-structural wave coupling in flexible walls.
Purpose of the Study:
- To develop an analytical calculation for breakout noise from a rectangular plenum with four flexible walls.
- To incorporate three-dimensional effects and acoustic-structural wave coupling phenomena.
Main Methods:
- Utilized an impedance-mobility approach for calculating plenum pressure and wall vibration.
- Modeled flexible walls as an unfolded plate for structural analysis.
- Employed the Kirchhoff-Helmholtz integral formulation to calculate radiated sound power.
Main Results:
- Developed a compact matrix formulation for coupled acoustic-structural response.
- Analytical results were validated against finite element and boundary element (FEM-BEM) models.
Conclusions:
- The impedance-mobility compact matrix (IMCM) approach effectively models coupled acoustic and structural subsystems.
- The study provides a validated analytical method for breakout noise prediction in flexible plenums.
Related Concept Videos
01:19Members Made of Elastoplastic Material
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
01:14Parallel RLC Circuits
Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
01:17Steady, Laminar Flow Between Parallel Plates
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
01:21Plastic Deformations of Members with a Single Plane of Symmetry
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
01:19Expansion and Contraction in Masonry Walls
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
To...
01:12Mesh Analysis for AC Circuits
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...