Aeroacoustic Environment of a Store in an Aircraft Weapons Bay
Abstract
Flight tests were performed in which the sound pressure level distribution on the surface of a store was measured. The store was installed in the weapons bay of an F-111 aircraft and was flown at Mach numbers between 0.7 and 1.3 for altitudes of 3,000, 10,000, and 30,000 feet. Constant Mach number flights as well as accelerated ones were performed. There was a total of 21 microphones installed on the surface of the store. The resulting data from the microphones were used to determine equal level sound pressure level contours for the entire surface of the store. These contours revealed that the levels increase fairly uniformly for the first one-third of the store and then for the remainder of the surface they display areas of maximum and minimum sound pressure levels. For prediction purposes the contours were normalized and one general contour shape was developed. Also, a general spectrum shape is presented which gives the frequency distribution of the energy. Comparisons to past data showed good results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1977
- Accession Number
- ADA041263
Entities
People
- David L. Smith
- L. L. Shaw
Organizations
- Flight Dynamics Laboratory