Propeller Hydrodynamic Loads and Blade Stresses and Deflections During Backing and Crashback Operations Available to Purchase

An efficient and user-friendly analysis package (approach) has been developed to assess commercial skewed propeller loading and blade stresses and deflections during steady backing and crashback operations. Predictions of backing and crashback pressure distributions on blade surfaces are estimated from a modified propeller steady force computer program, MIT-PSF. A finite element computer program, NASTRAN, is used to predict blade stresses and elastic deflections. An interface computer program provides the data linkage between the hydrodynamic loading and structural response computer programs. This paper describes the approach to integrate MIT-PSF and NASTRAN computer codes to iteratively determine blade loading and deflection during steady backing operations and the modification of MIT-PSF code to account for flow separation during steady crashback operations. The computed results are compared with limited open water experimental data for one skewed and one conventional propeller tested in steady backing and crashback conditions.