Longitudinal Motions and Stability of Two Hydrofoil Systems Free to Heave and Pitch in Regular Waves

Loading...
Thumbnail Image

View/Download File

Persistent link to this item

Statistics
View Statistics

Journal Title

Journal ISSN

Volume Title

Title

Longitudinal Motions and Stability of Two Hydrofoil Systems Free to Heave and Pitch in Regular Waves

Alternative title

Published Date

1961-12

Publisher

St. Anthony Falls Hydraulic Laboratory

Type

Working Paper

Abstract

Experimental measurements were made of the motions of two hydrofoil configurations free to heave and pitch in regular waves. The two configurations consisted of 1) a dihedral (V) foil forward, flat foil aft, and 2) dihedral (V) foils both fore and aft, and a flat foil near the center of gravity. The motions were measured in both head and following seas for a variety of wave characteristics and two towing velocities. The experimental results were compared with quasi-steady linear and nonlinear theory, and also unsteady linear theory. In general, agreement with the quasi-steady linear theory was satisfactory, although some improvement in the correlation was obtained by considering the effects of unsteadiness. Nonlinearities had little effect on the amplitudes of the oscillatory motions. The major effect of the nonlinearities was to produce a steady downward component of heave. The measured component was in most cases greater than that derived from analog computer solutions of the nonlinear equations. Experimental investigation of the inherent stability of both configurations in smooth water indicated that the damping was greater than predicted by the quasi-steady linear theory.

Keywords

Description

Bureau of Ships Fundamental Hydromechanics Research Program SR-009-01-01; Office of Naval Research Contract Nonr 710(30)

Related to

Replaces

License

Collections

Series/Report Number

Technical Paper Series B
37

Funding information

David Taylor Model Basin Department of the Navy

Isbn identifier

Doi identifier

Previously Published Citation

Other identifiers

Suggested citation

Wetzel, J. M.; Maxwell, W. H. C.. (1961). Longitudinal Motions and Stability of Two Hydrofoil Systems Free to Heave and Pitch in Regular Waves. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/108049.

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.