A closed, elastic cylindrical shell is used as a simple model of the aircraft’s fuselage. For reducing the vibration of the fuselage and the subsequent interior sound pressure due to the propellers, several dynamic absorbers are attached to the shell. In the paper, we analytically derive the vibration and the interior sound pressure of the shell by employing the techniques of subsystem synthesis and modal expansion where the external distributed pressures are chosen according to experimental data of an actual aircraft. The absorbers are successful for attenuating the vibration and the noise. The effects of altering various parameters of the shell, the external pressures, and the absorbers, are also studied and discussed. Finally, some general guidelines of absorber design for vibration and noise control of the fuselage are presented.

Issue Section:
Research Papers
Topics:
Noise control, Vibration, Shells, Sound pressure, Aircraft, Design, External pressure, Noise (Sound), Pipes, Propellers
1.
Berry
A.
, and
Nicolas
J.
,
1994
, “
Structural Acoustics and Vibration Behavior of Complex Panels
,”
Applied Acoustics
, Vol.
43
, pp.
185
–
215
.
2.
Bullmore
A. J.
,
Nelson
P. A.
, and
Elliott
S. J.
,
1990
, “
Theoretical Studies of the Active Control of the Propeller-Induced Cabin Noise
,”
Journal of Sound and Vibration
, Vol.
140
, pp.
191
–
271
.
3.
Fahy, F., 1985, Sound and Structural Vibration: Radiation, Transmission and Response, Academic Press, London, Britain.
4.
Fuller, C. R., 1985, “Mechanisms of Transmission and Control of Low-Frequency Sound in Aircraft Interior,” AIAA Paper 85–0879.
5.
Fuller
C. R.
, and
Jones
J. D.
,
1987
, “
Experiments on Reduction of Propeller Induced Interior Noise by Active Control of Cylinder Vibration
,”
Journal of Sound and Vibration
, Vol.
112
, pp.
389
–
395
.
6.
Fuller, C. R., Maillard, J. P., von Flotow, A. H., and Mercadal, M., 1995, “Control of Aircraft Interior Noise Using Globally Mis-tuned Vibration Absorbers,” Proceedings of First Joint CEAS/AIAA Aeroacoustics Conference, Germany.
7.
Halvorsen, W. G., and Emborg, U., 1989, “Interior Noise Control of the SAAB 340 Aircraft,” SAE Paper 891080.
8.
Huang
Y. M.
, and
Fuller
C. R.
,
1997
, “
Effects of Dynamic Absorbers on the Forced Vibration of Cylindrical Shell and Its Coupled Interior Sound Field
,”
Journal of Sound and Vibration
, Vol.
200
, pp.
401
–
418
.
9.
Inman, D. J., 1994, Engineering Vibration, Prentice-Hill, NJ.
10.
Jones, J. D., and Fuller, C. R., 1983, “Reduction of Interior Sound Fields in Flexible Cylinders by Active Vibration Control,” Proceedings of the 6th IMAC Conference, Florida.
11.
Leigh
B.
, and
Garcea
R.
,
1994
, “
The Use of Tuned Absorbers to Reduce Cabin Noise in Regional Turboprop Aircraft
,”
Canadian Aeronautics and Space Journal
, Vol.
40
, pp.
62
–
67
.
12.
Leissa, A. W., 1973, Vibration of Shell, NASA, Washington, D.C.
13.
Mathur, G. P., and Tran, B. N., 1993, “Aircraft Cabin Noise Reduction Tests Using Active Structural Acoustic Control,” AIAA Paper 93–4437.
14.
Silcox
R. J.
,
Lester
H. C.
, and
Abler
S. B.
,
1989
, “
An Evaluation of Active Noise Control in a Cylindrical Shell
,”
ASME JOURNAL OF VIBRATION, ACOUSTICS, STRESS, AND RELIABILITY IN DESIGN
, Vol.
111
, pp.
337
–
342
.
15.
Simpson, M. A., and Tran, B. N., 1993, “Aircraft Cabin Active Noise Control Performance Sensitivity Tests,” AIAA Paper 93–4436.
16.
Thomas
D. R.
,
Nelson
P. A.
, and
Elliott
S. J.
,
1993
a, “
Active Control of the Transmission of Sound through a Thin Cylindrical Shell, Part I: the Minimization of Vibration Energy
,”
Journal of Sound and Vibration
, Vol.
167
, pp.
91
–
111
.
17.
Thomas
D. R.
,
Nelson
P. A.
, and
Elliott
S. J.
,
1993
b, “
Active Control of the Transmission of Sound through a Thin Cylindrical Shell, Part II: the Minimization of Acoustic Potential Energy
,”
Journal of Sound and Vibration
, Vol.
167
, pp.
112
–
128
.
18.
von Flotow, A. H., Beard, A., and Bailey, D., 1994, “Adaptive Tuned Vibration Absorbers: Tuned Laws, Tracking Agility, Sizing, and Physical Implementations,” Proceedings of Noise Conference 94, Florida, U.S.A., pp. 389–394.
19.
Waterman, E. H., Kaptein, D., and Sarin, S. L., 1983, “Fokker’s Activities in Cabin Noise Control for Propeller Aircraft,” SAE Paper 830736.
This content is only available via PDF.
Copyright © 1998
 by The American Society of Mechanical Engineers
You do not currently have access to this content.