Accession Number:

ADA021770

Title:

Ice Impact Loads on the Rudder of an Icebreaking Tugboat.

Descriptive Note:

Final rept.,

Corporate Author:

ARCTEC INC COLUMBIA MD

Personal Author(s):

• Peter,J. J.
• Lecourt,E. J.

Report Date:

1976-01-01

Pagination or Media Count:

99.0

Abstract:

During the winter of 1974-75 measurements were made of ice impact loads on the rudder of the USCGC NAUGATUCK during icebreaking maneuvers at Sault Ste. Marie, Michigan. The report shows the relative frequency versus magnitude of the rudderstock torque produced by ice impact in various maneuvers, including backing through pressure ridges. The results of similar tests conducted earlier on a sister ship are included. The measurements were made by strain gaging the rudder-stock and by substituting specially designed pintles which were strain gaged to measure forces in orthogonal planes. The report explains the instrumentation system, the procedures used to gather the data, and the method by which the rudder was calibrated. Basic calculations of the rudder hydrodynamic loads are also presented.

Descriptors:

• *MARINE RUDDERS
• *TUGBOATS
• IMPACT
• STRESS ANALYSIS
• LOADS(FORCES)
• ICE
• STRAIN GAGES
• MANEUVERS
• TORQUE
• PINTLES
• ICEBREAKERS
• COAST GUARD SHIPS
• INLAND WATERWAYS

Subject Categories:

• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE