SKEWOPT: PROPELLER SKEW OPTIMIZATION PROGRAM USER'S AND PROGRAMMER'S DOCUMENTATION
The SKEWOPT propeller skew optimization program is presented. This program models skew distribution as a piecewise cubic or quadratic function of radius. The skew distribution is then optimized using constrained, non-linear mathematical programming to minimize a user-specified weighted, linear combination of the amplitudes of the six unsteady forces and moments acting at the propeller hub. Forces and moments may be evaluated by either a two-dimensional, sinusoidal gust technique or by a three-dimensional, lifting-line approach. The program is highly interactive and incorporates a number of options in an attempt to provide an effective, moderate cost design tool. Skew distribution modeling, optimization technique, and program organization are discussed. Derivations used in the problem formulation are summarized in Appendix A. Use of the program on the Michigan Terminal System (MTS) time-sharing network and examples of program use are given in Appendix B. Appendices C and D cover programmer's documentation and provide a source listing, respectively.
University of Michigan, Ann ArborDepartment of Naval Architects and Marine Engineers
Ann Arbor, MI USA 48109
Washington, DC USA 20590
- Greenblatt, J E
- Publication Date: 1978-8
- Pagination: 167 p.
- TRT Terms: Computer programs; Design; Force; Mathematical models; Nonlinear programming; Optimization; Propellers; Skewed structures; Theses; Vehicle design; Vibration
- Uncontrolled Terms: Skewness
- Old TRIS Terms: Computer programs (Propellers); Marine propellers; Marine surface propulsion; Propeller design; Propeller forces; Skewed propellers
- Subject Areas: Design; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00198666
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: MA-RD-940-79022 Intrm Rpt.
- Contract Numbers: MA-7-38077
- Files: TRIS, USDOT
- Created Date: Oct 17 1979 12:00AM