Journal ArticleDOI
Noise transmission from a curved panel into a cylindrical enclosure: Analysis of structural acoustic coupling
James K. Henry,Robert L. Clark +1 more
TLDR
Results indicate that predominately axial structural modes couple most efficiently to the acoustic modes of the enclosure, while structural acoustic coupling is found to not be significantly affected by varying panel position.Abstract:
Much of the research on sound transmission through the aircraft fuselage into the interior of aircraft has considered coupling of the entire cylinder to the acoustic modes of the enclosure. Yet, much of the work on structural acoustic control of sound radiation has focused on reducing sound radiation from individual panels into an acoustic space. Research by the authors seeks to bridge this gap by considering the transmission of sound from individual panels on the fuselage to the interior of the aircraft. As part of this research, an analytical model of a curved panel, with attached piezoelectric actuators, subjected to a static pressure load was previously developed. In the present work, the analytical model is extended to consider the coupling of a curved panel to the interior acoustics of a rigid-walled cylinder. Insight gained from an accurate analytical model of the dynamics of the noise transmission from the curved panels of the fuselage into the cylindrical enclosure of an aircraft is essential to the development of feedback control systems for the control of stochastic inputs, such as turbulent boundary layer excitation. The criteria for maximal structural acoustic coupling between the modes of the curved panel and the modes of the cylindrical enclosure are studied. For panels with aspect ratios typical of those found in aircraft, results indicate that predominately axial structural modes couple most efficiently to the acoustic modes of the enclosure. The effects of the position of the curved panel on the cylinder are also studied. Structural acoustic coupling is found to not be significantly affected by varying panel position. The impact of the findings of this study on structural acoustic control design is discussed.read more
Citations
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Journal ArticleDOI
A modified Fourier solution for sound-vibration analysis for composite laminated thin sector plate-cavity coupled system
TL;DR: In this paper, the authors applied the modified Fourier series method to investigate the sound-vibration characteristics by establishing a composite laminated thin sector plate-cavity coupled model for the first time based on the classical plate theory (CPT) and Rayleigh-Ritz energy technique.
Journal ArticleDOI
The vibro-acoustic response and analysis of a full-scale aircraft fuselage section for interior noise reduction.
TL;DR: A high degree-of-freedom finite element model of the fuselage section was developed as a predictive tool, yielding a general model development methodology for accurate prediction of structures with moderate to high complexity.
Journal ArticleDOI
Vibro-acoustic analysis of the annular segment flexible plate coupled with an impedance walled enclosure
TL;DR: In this paper, a structural-acoustic coupling model is proposed which is composed of an annular segment thin plate with various elastic boundary constraints and an acoustic enclosure with rigid-wall or various impedance-wall boundary conditions.
Journal ArticleDOI
Active structural–acoustic control of laminated cylindrical panels using smart damping treatment
M. C. Ray,R. Balaji +1 more
TL;DR: In this paper, the performance of active constrained layer damping (ACLD) treatment for active structural-acoustic control of a vibrating thin laminated cylindrical panel has been investigated.
Journal ArticleDOI
Noise reduction in a launch vehicle fairing using actively tuned loudspeakers.
Jonathan D. Kemp,Robert L. Clark +1 more
TL;DR: Experimental results indicate that a tuned loudspeaker placed in the nose cone of the fairing significantly reduces acoustic energy and verifies results calculated from the simulation.
References
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Journal ArticleDOI
Acoustoelasticity - General theory, acoustic natural modes and forced response to sinusoidal excitation, including comparisons with experiment
TL;DR: In this paper, a comprehensive theoretical model has been developed for interior sound fields which are created by flexible wall motion resulting from exterior sound fields, and an efficient computational method is used to determine acoustic natural frequencies of multiply connected cavities.
Journal ArticleDOI
Experiments on active control of structurally radiated sound using multiple piezoceramic actuators
Robert L. Clark,Chris R. Fuller +1 more
TL;DR: In this paper, the adaptive least-mean-squares (lms) algorithm was used to attenuate sound radiation from a vibrating rectangular plate excited by a steady-state harmonic point force disturbance.
Journal ArticleDOI
Noise reduction of rectangular enclosures with one flexible wall
TL;DR: In this article, the noise reduction produced by a small rigid enclosure with one flexible wall is computed for very low frequencies where both wall and enclosed volume are stiffness controlled, for frequencies where the wall is resonant and the volume is stiff, and for frequency where both the wall and the acoustic space have resonant behavior.
Journal ArticleDOI
Optimal placement of piezoelectric actuators and polyvinylidene fluoride error sensors in active structural acoustic control approaches
Robert L. Clark,Chris R. Fuller +1 more
TL;DR: Results from this study indicate that optimization of control actuators and error sensors provided a method for realizing ‘‘smart’’ structures for active structural acoustic control (ASAC), rivaling in importance the performance increase gain when acoustic control is achieved with microphone error sensors and multiple control actuator.