EVALUATION OF A FINITE DIFFERENCE HELICOIDAL SHELL ANALYSIS BY COMPARISON WITH TEST RESULTS FOR A MARINE PROPELLER
The ability to predict the blade natural frequencies and the stresses under operating conditions is a necessary requirement of the blade design process. This requires an accurate definition of the steady and cyclic pressure loads over the blade surface. It also requires an appropriate structural model and analytic procedure for solving the structural response of the blade. This paper presents the results achieved by application of a finite difference helicoidal shell analysis computer program to a supercavitating marine propeller blade. The natural frequencies, mode shapes, steady stress and cyclic stress are evaluated, and the results are compared to measured values. Comparison with test results is made using both analytically derived and measured pressure distributions. Correlation of measured and calculated "in air" natural frequencies and mode shapes is quite good particularly for the higher modes. The calculated stresses agree well when compared to calculations based upon measured pressures.
- Paper presented at Propellers 75, Philadelphia, Pa., July 22-23, 1975.
Society of Naval Architects and Marine Engineers601 Pavonia Avenue
Jersey City, NJ USA 07306-2907
- Westervelt, W W
- Publication Date: 1975-7
- Features: References;
- Pagination: 10 p.
- TRT Terms: Blades (Machinery); Finite differences; Propellers; Stresses; Supercavitating propellers; Vibration
- Old TRIS Terms: Blade frequency vibration; Propeller stresses
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00099344
- Record Type: Publication
- Source Agency: Society of Naval Architects and Marine Engineers
- Report/Paper Numbers: #3
- Files: TRIS
- Created Date: Sep 30 1975 12:00AM