Automatic control of propeller pitch

Download
Author
Flanagan, David B.
Date
1962-06Advisor
Powell, S. Curtis
Metadata
Show full item recordAbstract
The object of this study was to determine the feasibility of automatically controlling propeller pitch to reduce RPM fluctuations caused by variations in propeller speed of advance. The investigation was made ignoring the reduced frequency effect and power plant governing. A Victory Ship (AP2) was chosen as a prototype and a feedback system controlling the pitch of a controllable pitch propeller was developed. A non-linear analogue computer program approximating the system and the propeller characteristics is presented. Electronic difficulties prevented obtaining total system response from this program. The computer study indicated that a linear analysis would be useful. The linear analysis indicated that, for the prototype, in order to achieve a reduction in RPM fluctuation of 10% of that present in the fixed pitch case, a hydraulic pump consuming over 300 HP would be needed. Systems utilizing RPM, shaft torque, and thrust are analyzed. Thrust sensing provided the poorest response and in fact increased the RPM fluctuation for lower frequencies. RPM governing by automatic control of propeller pitch was found to be inadvisable unless major design changes are made to reduce the spindle torque of presently available controllable pitch propellers.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
ASYMMETRIC INFLUENCE OF SINGLE PROPELLER UUV OPERATIONS ON ENTANGLEMENT WITH MARINE VEGETATION
Dubyoski, James M. (Monterey, CA; Naval Postgraduate School, 2022-06);This thesis continues previous work conducted on the interactions between a single propeller unmanned underwater vehicle (UUV) and marine vegetation. It attempts to define the asymmetric behavior of entanglement between a ... -
Predicting naval aviator attrition using economic data
Bookheimer, William R. (Monterey, California. Naval Postgraduate School, 1995-12);Understanding and accurately predicting attrition is vital to correctly managing the retention of naval aviators. This thesis investigates the ability of models incorporating a number of economic measures to predict naval ... -
A computational tool for the rapid design and prototyping of propellers for underwater vehicles
D'Epagnier, Kathryn Port. (Cambridge Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution,, 2007-09);An open source, MATLAB (trademarked)-based propeller design code MPVL was improved to include rapid prototyping capabilities as well as other upgrades as part of this effort. The resulting code, OpenPVL is described in ...