Calculated and Measured Blade Structural Response on a Full-Scale Rotor
Abstract
The restricted problem of calculating the bending-moment response of a full-scale rotor to measured airloads is studied. Data are used from separate tests of an articulated rotor in flight and in a wind tunnel. Linear equations to represent the blade mass and structure are used, and the solution is obtained by numerically solving the resulting two-point boundary problem. The measured aerodynamic loads include effects caused by both rigid blade motion and elastic deformation and hence, represent an exact aerodynamic model. By comparing the calculated blade-bending and torsional-moment response with measurement, it is possible to assess the adequacy of the structural model for the calculation of calculating vibratory loads. These comparisons are good for the flap- and torsional-moments at the lower harmonics. Calculations for the chord-bending moments are less satisfactory and reveal problems with the method of deriving the chord airloads from the measured normal forces, or the representation of the nonlinear lead-lag damper.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1986
- Accession Number
- ADA174261
Entities
People
- Jacques Esculier
- William G. Bousman