Comparison of Predicted and Measured Towline Tensions

The extreme towline tension prediction methods used by the U.S. Navy are based on analytical models developed by Milgram, Triantafyllou, Frimm and Anagnostou. The analysis of the test results for an instrumented offshore tow conducted in 1989 indicated that the analytical model underpredicted extrem...

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Bibliographic Details
Main Author: Thomas, Gregory R
Format: Report
Language:English
Subjects:
ATM(AUTOMATIC TOWING MACHINE)
COMPARISON
CORRECTIONS
LOW FREQUENCY
MATHEMATICAL MODELS
MATHEMATICAL PREDICTION
Mechanics
NUCLEAR POWERED SUBMARINES
OCEANS
OFFSHORE
SEA TESTING
SHIP MOTION
Submarine Engineering
SURGES
TENSION
TEST AND EVALUATION
THESES
TOWING CABLES
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Summary:The extreme towline tension prediction methods used by the U.S. Navy are based on analytical models developed by Milgram, Triantafyllou, Frimm and Anagnostou. The analysis of the test results for an instrumented offshore tow conducted in 1989 indicated that the analytical model underpredicted extreme tension. The reason for the underprediction of the extreme tension was the analytical model did not account for the second order ship surge motions and resulting low frequency tension fluctuations. Frimm and Milgram proposed a semi- empirical correction to the extreme tension model based on an analysis of the at sea test results.