Accession Number : ADA117665

Title :   Establishment of a Rotor Model Basis.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : McFarland,R E

PDF Url : ADA117665

Report Date : Jun 1982

Pagination or Media Count : 93

Abstract : Radial-dimension computations in the RSRA's blade-element model are modified for both the acquisition of extensive baseline data and for real-time simulation use. The baseline data, which are for the evaluation of model changes, use very small increments and are of high quality. The modifications to the real-time simulation model are for accuracy improvement, especially when a minimal number of blade segments is required for real-time synchronization. An accurate technique for handling tip loss in discrete balde models is developed. The mathematical consistency and convergence properties of summation algorithms for blade forces and moments are examined and generalized integration coefficients are applied to equal-annuli midpoint spacing. Rotor conditions identified as constrained and balanced are used and the propagation of error is analyzed. (Author)

Descriptors :   *Rotor blades(Rotary wings), *Mathematical models, Rotary wing aircraft, Data acquisition, Angle of attack, Computations, Modification, Real time, Computerized simulation, Accuracy, Synchronism, Segmented, Aerodynamic drag, Lift, Convergence, Algorithms, Moments, Coefficients, Integration, Error analysis, Azimuth

Subject Categories : Helicopters
      Theoretical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE