Sound transmission through double-walls

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Table of contents

1 INTRODUCTION 
1.1 Industrial context
1.2 Objectives
1.3 Literature review
1.3.1 Aircraft interior noise: sources and control treatments
1.3.2 Vibroacoustics of aircraft panels
1.3.3 Sound transmission through double-walls
1.3.4 Compression effects on the acoustic performance of porous materials
1.3.5 Vibration isolating mounts
1.4 Summary and methodology
2 INFLUENCE OF FIBROUS MATERIAL COMPRESSION ON THE SOUND TRANSMISSION OF COVERED PANELS 
2.1 Chapter introduction
2.2 Résumé de l’article publié dans le journal Applied Acoustics
2.3 Paper published on the Applied Acoustics Journal – Introduction
2.4 Theory
2.4.1 Modelling sound absorbing materials
2.4.2 Effects of compression on porous physical parameters
2.4.3 Sound transmission through multilayer structures
2.5 Description of the experiment
2.6 Results and discussion
2.6.1 Influence of compression on the TL response
2.6.2 Influence of fibrous properties on the TL
2.6.3 Influence of compression on the radiation efficiency
2.7 Conclusion
2.8 Appendix: Modelling sound absorbing materials (complementary theory) .
3 MODELLING OF COUPLING LOSS FACTOR OF AIRCRAFT DOUBLEWALLS COUPLED VIA VIBRATION ISOLATORS 
3.1 Chapter introduction
3.2 Résumé de l’article publié dans le journal NCEJ
3.3 Paper published on the NCEJ Journal – Introduction
3.4 Theory
3.4.1 SEA modelling of a double-wall
3.4.2 Isolator modelling and structural coupling loss factor determination
3.5 Description of the experiments
3.5.1 Measurement of isolator’s dynamic stiffness
3.5.2 SEA measurements on a double-wall
3.6 Results and discussion
3.6.1 Isolator dynamic stiffness
3.6.2 Results in configuration 1
3.6.3 Results in configuration 2
3.7 Conclusion
4 SOUND TRANSMISSION THROUGH UNCOUPLED AIRCRAFT DOUBLEWALLS
4.1 Chapter introduction
4.2 Résumé de l’article soumis au journal Acta Acustica united with Acustica .
4.3 Paper submitted to Acta Acustica United with Acustica Journal – Introduction
4.4 Theory
4.4.1 Transfer matrix method (TMM)
4.4.2 Statistical energy analysis (SEA)
4.5 Description of the measurements
4.5.1 Description of the systems
4.5.2 Damping loss factor
4.5.3 Modal density
4.5.4 Radiation efficiency
4.5.5 Transmission loss
4.6 Results and discussion
4.6.1 Modal density
4.6.2 Radiation efficiency
4.6.3 Transmission loss comparisons between TMM, SEA and measurements
4.7 Conclusion
4.8 Supplementary analysis on academic double-walls
5 SOUND TRANSMISSION THROUGH MECHANICALLY COUPLED AIRCRAFT DOUBLE-WALLS 
5.1 Chapter introduction
5.2 Double-wall SEA modelling under acoustic excitation (diffuse field)
5.2.1 Résumé de l’article à être soumis au Journal of the Acoustic society of America
5.2.2 Paper to be submitted to the Journal of the Acoustical Society of America – Introduction
5.2.3 Theory
5.2.4 Description of the experiments
5.2.5 Results and discussion
5.2.6 Conclusion
5.3 Double-wall SEA modelling under structural excitation (uncorrelated point forces)
6 GENERAL CONCLUSION AND FUTURE WORK 
A Principles for double-wall SEA modelling under aerodynamic excitation (turbulent boundary layer)
LIST OF REFERENCES