Sound Transmission Across a Finite Simply Supported Double-Laminated Composite Plate With Enclosed Air Cavity

Abstract

Vibro-acoustic analysis of a finite orthotropic laminated double-composite plate with enclosed air cavity on an infinite acoustic rigid baffle is investigated analytically. Using the acoustic velocity potential to describe the acoustic vibration performance of a simple supported structure, the sound transmission loss (STL) is calculated from the ratio of incident to transmitted acoustic powers. Specifically, the focus is placed on the effects of several key system parameters on sound transmission including the plate dimensions, the laminate configurations, the boundary conditions and the composite materials are systematically examined.

Sound Transmission Loss Across a Finite Clamped Double-Laminated Composite Plate With Poroelastic Material

“…The vibro-acoustic response of an orthotropic symmetric composite double-plate with poroelastic materials (Fig. 1) induced by sound excitation is governed by [7,8]:…”

“…Considering the relation (19) and the velocity potential definitions (16) and (17), the sound power of incident and transmitted are determined by [7,8]   The sound transmission loss (STL) is calculated in decibel scale via [7]    …”

“…where τ is the transmission coefficient and is defined as the ratio of the transmitted and incident sound power by [8,10]…”

“…The aim of the present work is hence to develop an analytical model to address this problem by combining the approach of Lu and Xin [7] and the model of Bolton et al on sandwich panels with poroelastic cores [1]. Thanh and Thinh [8] studied vibro-acoustic of a finite orthotropic laminated double-composite plate with enclosed air cavity using the acoustic velocity potential to describe the acoustic vibration performance of a simple supported structure. Approach of Panneton et al [9] applied to the sound transmission loss through multilayer structures made from a combination of elastic, air, and poroelastic materials.…”

Sound Transmission Loss Across a Finite Clamped Double-Laminated Composite Plate With Poroelastic Material

“…These acoustic velocity potentials are related to the acoustic pressure p and the normal acoustic particle velocity * z v in the fluid and solid field [8,11]:…”