The results of an experimental study to determine the noise attenuation characteristics of aircraft type fuselage structural panels were presented. Of particular interest was noise attenuation at low frequencies, below the fundamental resonances of the panels. All panels were flightweight structures for transport type aircraft in the 34,050 to 45,400 kg (75,000 to 100,000 pounds) gross weight range. Test data include the results of vibration and acoustic transmission loss tests on seven types of isotropic and orthotropically stiffened, flat and curved panels. The results show that stiffness controlled acoustically integrated structures can provide very high noise reductions at low frequencies without significantly affecting their high frequency noise reduction capabilities.
Low-frequency noise reduction of lightweight airframe structures
1976-08-01
Report
No indication
English
Interior Noise Reduction in Composite Airframe Structures
British Library Conference Proceedings | 1995
|Airframe Noise Reduction Challenge
NTIS | 2004
|The Airframe Noise Reduction Challenge
NTRS | 2004
|Progress in Airframe Noise Reduction
British Library Conference Proceedings | 2001
|