Transmission loss prediction on SIDO and DISO expansion-chamber mufflers with rectangular section by using the collocation approach

2007 ◽  
Vol 49 (7) ◽  
pp. 872-877 ◽  
Author(s):  
C.J. Wu ◽  
X.J. Wang ◽  
H.B. Tang
Keyword(s):  
Transmission Loss ◽  
Expansion Chamber ◽  
Rectangular Section ◽  
Loss Prediction ◽  
Collocation Approach

scholarly journals 3D Global Weak-Form Mesh-Free Method for Acoustic Attenuation Analysis of Expansion Chambers

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Chun-Hui Fang ◽  
Cheng-Yang Liu ◽  
Zhi Fang
Keyword(s):  
Transmission Loss ◽  
Interpolation Method ◽  
Weak Form ◽  
Computational Accuracy ◽  
Acoustic Attenuation ◽  
Expansion Chamber ◽  
Acoustic Characteristics ◽  
Acoustic Modes ◽  
Mesh Free ◽  
Mesh Free Method

In order to avoid the dependence of mesh method on grids, a 3D global weak-form mesh-free method (MFM) is applied to study the three-dimensional acoustic characteristics of silencers. For the expansion chamber silencers, the 3D acoustic modes are extracted and the transmission loss results are computed by using the 3D global weak-form (MFM), which is based on the radial basis function point interpolation method (RPIM) for calculating the shape functions and Galerkin method for discretizing the system equation. The first 15 order 3D acoustic modes and TL results of a special expansion chamber silencer are presented to validate the computational accuracy of the proposed technique, and the relative errors are controlled within 0.5% by comparing with the 3D finite element method (FEF) calculations. Additionally, the effects of axial modes on the acoustic characteristics are investigated, and the pass through frequencies can be eliminated to enhance the acoustic attenuation performance by locating the side branch outlet on the nodal lines of axial modes.

Environmentally adaptive acoustic transmission loss prediction with neural networks

2005 ◽  
Author(s):  
Gordon Wichern ◽  
Mahmood R. Azimi-Sadjadi ◽  
Michael Mungiole
Keyword(s):  
Neural Networks ◽  
Transmission Loss ◽  
Acoustic Transmission ◽  
Loss Prediction
Sign in / Sign up

Export Citation Format

Share Document