Sound transmission loss of laminated composite sandwich structures with pyramidal truss cores

2019 ◽  
Vol 220 ◽  
pp. 19-30 ◽  
Author(s):  
Dong-Wei Wang ◽  
Li Ma ◽  
Xin-Tao Wang ◽  
Zhi-Hui Wen ◽  
Christ Glorieux
Keyword(s):  
Transmission Loss ◽  
Sandwich Structures ◽  
Sound Transmission ◽  
Laminated Composite ◽  
Sound Transmission Loss ◽  
Composite Sandwich ◽  
Composite Sandwich Structures ◽  
Pyramidal Truss

scholarly journals SOUND TRANSMISSION LOSS ACROSS A FINITE CLAMPED DOUBLE-LAMINATED COMPOSITE PLATE WITH POROELASTIC MATERIAL

2020 ◽  
Vol 57 (6A) ◽  
pp. 150
Author(s):  
Thanh Ngoc Pham
Keyword(s):  
Composite Plate ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Laminated Composite ◽  
Double Series ◽  
Composite Plates ◽  
Thin Plates ◽  
Sound Transmission Loss ◽  
Laminated Composite Plate ◽  
Poroelastic Material

A theoretical study of sound transmission loss across a clamped double-laminated composite plate filled with poroelastic material is formulated. Biot’s theory is employed to describe wave propagation in elastic porous media. The two face composite plates are modeled as classical thin plates. By using the modal superposition theory, a double series solution for the sound transmission loss of the structure is obtained with the help of the Galerkin method. The analytical model is validated against previous experimental results of a single sound wave under normal incidence. The numerical results suggest that the density of poroelastic material, the type of composite materials and the composite plies arrangement have significant effects on the sound transmission loss of considered structure.

Effect of Material and Geometry on the Sound and Vibration Transmission across a Sandwich Beam

2000 ◽  
Vol 123 (2) ◽  
pp. 205-212 ◽  
Author(s):  
Priya Thamburaj ◽  
J. Q. Sun
Keyword(s):  
Transmission Loss ◽  
Sandwich Structures ◽  
Numerical Study ◽  
Sandwich Beam ◽  
Sound Transmission ◽  
Anisotropic Materials ◽  
Sound Transmission Loss ◽  
Vibration Transmission ◽  
Isolation Performance

This paper studies sound and vibration transmission across a sandwich beam made of anisotropic materials. In our previous study, we have found that there is a significant increase in the transmission loss for the sandwich beam with anisotropic materials as compared with isotropic ones. This paper presents an extensive numerical study of the effects of damping, thickness of the laminae and density of the material on the sound transmission loss. This work may eventually lead to a new way of designing sandwich structures with high vibration and noise isolation performance.

Investigation of power transmission across laminated composite doubly curved shell in the presence of external flow considering shear deformation shallow shell theory

2017 ◽  
Vol 24 (19) ◽  
pp. 4492-4504 ◽  
Author(s):  
R Talebitooti ◽  
MR Zarastvand ◽  
HD Gohari
Keyword(s):  
Shear Deformation ◽  
Shallow Shell ◽  
Shell Theory ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Laminated Composite ◽  
Sound Transmission Loss ◽  
Effective Parameters ◽  
Mean Flow ◽  
Doubly Curved

This study applies shear deformation shallow shell theory to inspect the acoustic behavior of laminated composite infinitely long doubly curved shallow shells subject to a radiating oblique plane sound wave. Herewith, a procedure is developed to investigate sound transmission loss through this shell, clarified as a ratio of incident power to transmitted power in the existence of mean flow. In a further step, displacements are developed as a linear combination of the thickness coordinate to designate an analytical solution based on shear deformation shallow shell theory. Consequently, an exact solution for sound transmission loss is brought forward by combining acoustic wave equations as a result of wave propagation through this shell with doubly curved shell equations of motion. Afterwards, the accuracy of the present formulation (shear deformation shallow shell theory) is determined by comparing the achieved results with those available in the literature and some assumptions associated with the geometric specifications of the plate are investigated. Finally, because of the remarkable achievement of the current formulation results in reduction of noise transmission into such structures, some effective parameters on sound transmission loss are used in numerical results, to solve this problem.

scholarly journals SOUND TRANSMISSION LOSS ACROSS A FINITE CLAMPED DOUBLE-LAMINATED COMPOSITE PLATE WITH POROELASTIC MATERIAL

2020 ◽  
Vol 57 (6A) ◽  
pp. 150
Author(s):  
Thanh Ngoc Pham
Keyword(s):  
Composite Plate ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Laminated Composite ◽  
Double Series ◽  
Composite Plates ◽  
Thin Plates ◽  
Sound Transmission Loss ◽  
Laminated Composite Plate ◽  
Poroelastic Material

A theoretical study of sound transmission loss across a clamped double-laminated composite plate filled with poroelastic material is formulated. Biot’s theory is employed to describe wave propagation in elastic porous media. The two face composite plates are modeled as classical thin plates. By using the modal superposition theory, a double series solution for the sound transmission loss of the structure is obtained with the help of the Galerkin method. The analytical model is validated against previous experimental results of a single sound wave under normal incidence. The numerical results suggest that the density of poroelastic material, the type of composite materials and the composite plies arrangement have significant effects on the sound transmission loss of considered structure.

scholarly journals Investigation of Sound Transmission Loss Through Sandwich Panel with Foam Core

2018 ◽  
Vol 26 (6) ◽  
pp. 101-117 ◽  
Author(s):  
Hatem Hadi Obeid ◽  
Huda Nadhim Mohammed
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Intensity ◽  
Sound Transmission Loss ◽  
Composite Sandwich ◽  
Acoustic Insulation ◽  
Noise Characteristics ◽  
Important Research Topic ◽  
Core Thickness ◽  
Important Design

In the past years, customer and consumer request are increased for performance sound. Where vibration and noise characteristics are made of important design criteria. The vibro- acoustic behavior is considered in the composite sandwich, important research topic to provide a suitable design with consumer requirements. The sound intensity method is widely using to measure the sound transmission loss between two rooms. This method are used with a composite materials, that are consist of two steel layers between them one layer for core. This paper provides a brief description of the sound intensity method and it is depended on ISO140[1]. Finite Element Method (FEM) are used to comparison with experimental results.The core of different thickness was used to study its effect on acoustic insulation. The experimental and theoretical results are shown, that the value of sound transmission loss are increased by rates of 6dB when the core thickness is doubled .

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