Accession Number : AD0777668

Title :   A Correlation Study of In-Flight Vibration Measurements for Patrol-Type Aircraft.

Descriptive Note : Technical rept. no. 1, 15 Oct 68-30 Jun 71,


Personal Author(s) : Tan,P. ; Ordway,D. E. ; Iwan,L. S.

Report Date : DEC 1973

Pagination or Media Count : 51

Abstract : A correlation study of vibration data for patrol-type and similarly-configured aircraft in turbulence-free, straight and level flight is presented. All of the known existing measurements for six planes are examined. A free-free uniform beam with a single lumped mass at midspan for the fuselage, together with an approximate representation of the exciting forces, is proposed as a mathematical model. The expression for the vibrational response is derived by the second form of the Ritz method. Computed results for the double displacement amplitude spectrums are compared with the measured data and found to agree very well. A simple correlation formula is also developed. (Author)

Descriptors :   *Antisubmarine aircraft, *Patrol aircraft, Vibration, Airframes, Flight testing, Mathematical models, Computerized simulation

Subject Categories : Aerodynamics
      Patrol and Reconnaissance Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE