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Record W2609308336

Tow Forces in Waves for Canadian Navy Vessels

2009· article· en· W2609308336 on OpenAlexaboutno aff
Kevin McTaggart, Eric Thornhill

Bibliographic record

Venuenot available
Typearticle
Languageen
FieldEngineering
TopicShip Hydrodynamics and Maneuverability
Canadian institutionsnot available
Fundersnot available
KeywordsTowingMarine engineeringDragPropellerNavyHullEngineeringRopeSea stateAeronauticsStructural engineeringAerospace engineeringGeologyOceanography
DOInot available

Abstract

fetched live from OpenAlex

Abstract : Towing operations are often conducted by the Canadian Navy. Evaluation of associated forces is required to determine whether towing can safely occur without breakage of rope. This report examines forces that can influence towing operations in a seaway. Ship hydrodynamic resistance and air resistance are evaluated using drag coefficients. For a vessel being towed, additional resistance arises from propeller parasitic drag, which will vary greatly depending on whether a propeller is freewheeling or locked. The presence of a seaway introduces added resistance, and also dynamic forces due to surge excitation acting on the two vessels in a towing operation. A frequency domain method has been developed for predicting dynamic forces during towing. Towing force predictions in sea state 5 show that the presence of a seaway can contribute greatly to total towing forces. It is recommended that propellers on a towed vessel be allowed to freewheel during towing operations, and that towing speeds be reduced in higher sea states.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: Simulation or modeling
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.416
Threshold uncertainty score0.994

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.007
GPT teacher head0.212
Teacher spread0.205 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one teacher head, not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designSimulation or modeling
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations0
Published2009
Admission routes1
Has abstractyes

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