Active Control of Sound Transmission through Orthogonally Rib Stiffened Double-Panel Structure: Mechanism Analysis

Xiyue Ma,Kean Chen,Jian Xu

doi:10.3390/app9163286

Xiyue Ma, Kean Chen + Show 1 more

Open Access

https://doi.org/10.3390/app9163286

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Journal: Applied Sciences	Publication Date: Aug 10, 2019
Citations: 8	License type: CC BY 4.0

Affiliation: Northwestern Polytechnical University

Abstract

Physical mechanisms of active control of sound transmission through orthogonally two ribs stiffened double-panel structure are investigated. This is the continued work of the single rib stiffened case. For the orthogonally two ribs stiffened case, four different cluster mode groups can be coupled with each other, due to the interlaced coupling effects of the horizontal and vertical ribs. One cavity mode can couple with and transmit sound energy to any type of base plate mode of the radiating ribbed plate. Consequently, the main differences of the control mechanism, when compared with the single ribbed case, lie in two aspects. One is that a novel mechanism appears. That is, suppressing and rearranging the cavity modes simultaneously achieves the suppression of the base plate modes. The other is that rearrangement of the cavity modes to rearrange the base plate modes for achieving sound radiation cancellation almost does not appear. The reason is that all types of cavity mode can couple with any one of the base plate modes due to the coupling effects of the two ribs. There is only a need to rearrange several important cavity modes to achieve suppressing the base plate mode of the radiating ribbed plate.

Highlights

The rib stiffened double-panel structure is the most common form of bulkhead structure used in aviation and navigation [1]
In order to fill these theoretical gaps, Ma [8] presents an analytical investigation on the physical mechanism of active control of sound transmission through a single rib stiffened double-panel system, using the cavity control approach
The aim of this paper is to further explore the active control mechanisms of such a structure, which may support engineering application of this technique in the future

Summary

Introduction

The rib stiffened double-panel structure is the most common form of bulkhead structure used in aviation and navigation [1]. In order to fill these theoretical gaps, Ma [8] presents an analytical investigation on the physical mechanism of active control of sound transmission through a single rib stiffened double-panel system, using the cavity control approach. Ma [8] further applies modal expansion and vibro-acoustic coupling methods to model the single rib stiffened double-panel structure It provides a good understanding of the rule of sound energy transmission between the cavity and radiating ribbed plate, and the original mechanisms of active control triggered by the coupling effects of the rib. Compared with the unribbed double-panel system [4,5,6,19,20,21], the physical mechanism of active control of noise transmission presents additional prominent differences for the single ribbed case.

Theoretical Modeling Approach

Model Parameters Assignment and Model Validation

The Resonant Characteristics of the Ribbed Plate

Physical Mechanism Analysis

Many of the base plate

Conclusions