scholarly journals Noise transmission loss of a rectangular plate in an infinite baffle

1984 ◽  
Vol 75 (S1) ◽  
pp. S2-S3 ◽  
Author(s):  
Louis A. Roussos
Keyword(s):  
Rectangular Plate ◽  
Transmission Loss ◽  
Noise Transmission

Analytical approach to evaluate transmission loss of finite rectangular plate considering its eigenmodes.

2017 ◽  
Vol 2017 (0) ◽  
pp. 412
Author(s):  
Takashi YAMAMOTO ◽  
Hidenori TANAKA ◽  
Hiroyuki SAWADA ◽  
Toshio ENOMOTO
Keyword(s):  
Rectangular Plate ◽  
Analytical Approach ◽  
Transmission Loss

Optimization of Noise Transmission Through Sandwich Structures

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Mohamed Guerich ◽  
Samir Assaf
Keyword(s):  
Sandwich Plate ◽  
Transmission Loss ◽  
Sandwich Structures ◽  
Acoustic Medium ◽  
Element Formulation ◽  
Sound Power ◽  
Surface Mass ◽  
Various Boundary Conditions ◽  
Design Variables ◽  
Noise Transmission

An optimization methodology to increase the noise transmission loss (TL) of damped sandwich structures is presented. The prediction of the TL uses a numerical tool based on a finite element formulation for the sandwich plate coupled to a boundary element method for the acoustic medium. This tool can be used for arbitrarily shaped three-layer sandwich plates with various boundary conditions and it is well adapted to parametric and optimization studies. First, a parametric study was conducted to choose the objective function, the constraints, and the pertinent design variables to use in the optimization problem which consist in reducing the sound power transmitted by a viscoelastically damped sandwich plate. Next, by constraining the acoustical behavior of the sandwich panel, the surface mass of the sandwich structure was minimized. It is shown that a significant reduction in the transmitted sound power can be achieved by selecting the appropriate geometric configuration and damping layer material.

Empirical prediction of traffic noise transmission loss across plenum windows

2019 ◽  
Vol 151 ◽  
pp. 45-54 ◽  
Author(s):  
Xiaolong Li ◽  
Y.G. Tong ◽  
S.K. Tang ◽  
K.K. Lau
Keyword(s):  
Transmission Loss ◽  
Traffic Noise ◽  
Empirical Prediction ◽  
Noise Transmission

Natural Vibration of a Cavity Backed Rectangular Plate Using A Receptor-Rejector System Model

1995 ◽  
Vol 117 (4) ◽  
pp. 416-423 ◽  
Author(s):  
C. Rajalingham ◽  
R. B. Bhat ◽  
G. D. Xistris
Keyword(s):  
Rectangular Plate ◽  
Natural Vibration ◽  
Coupled System ◽  
System Model ◽  
Total System ◽  
Modal Interactions ◽  
Principle Of Superposition ◽  
Noise Transmission ◽  
Modes Of Vibration ◽  
Flexible Wall

Forced vibration of a cavity backed rectangular plate is widely used to study the physics of noise transmission into an enclosure. In this context, the cavity backed plate is a dynamical system with coupled motion of the plate and the air cavity. The natural frequencies of the coupled system are the most important characteristics of the noise transmission into the cavity. This paper investigates the natural vibration of a cavity backed rectangular plate and presents numerical results for the particular case of a cavity backed simply supported plate. The natural vibration of the total system is viewed as the result of the interactions of various natural modes of vibration of its subsystems. The physics of the modal interactions is discussed using a receptor-rejector system model, and the dynamics of the cavity backed panel is investigated using the plate receptance and the cavity rejectance (inverse receptance) parameters. The modal interactions are further clarified using a cavity backed piston forming a single degree of freedom system. With the principle of superposition, the receptor-rejector system model can be used to analyze cavities with more than one flexible wall.

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