EXPERIMENTAL STUDY OF THE RANDOM VIBRATIONS OF AN AIRCRAFT STRUCTURE EXCITED BY JET NOISE.
Abstract
Recordings were made of the strains induced in a full scale rear fuselage test structure of the Caravelle airliner when one jet engine is running at maximum take-off thrust. The structure is a conventional sheet-stringer combination attached to pressed out frames. The analysis was concentrated on the strains in the centres of panels. Correlation measurements indicated that the lower frequencies (up to 500 c.p.s.) are associated with overall vibration modes and have low strain amplitude. The larger panel strains occur at higher frequencies with the frames acting as boundaries. In these measurements the main resonance peak in each panel occurs at about 600-700 c.p.s. and was identified with the fundamental stringer twisting mode (i.e., adjacent panels 180 degrees out of phase). There are generally two smaller peaks in the 800 - 1000 c.p.s. range but the modes of vibration have not been completely identified due to lack of information. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1960
- Accession Number
- AD0638142
Entities
People
- B. L. Clarkson
- R. D. Ford
Organizations
- University of Southampton