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General HydroStatics
Ship Stability Software |
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Command of the Week
(New or interesting aspects of GHS that you may not know about) |
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Towboat_Criterion Wizard
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| GHS comes with many wizards, each of which is tailored for a specific task. The Towboat_Criterion wizard deals specifically with 46 CFR 173.095, a US regulation that applies to towing vessels. Part B contains a formula for required GM which is calculated directly from vessel parameters shown below. |
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The wizard supports calculation of maximum VCG for a series of displacements as well as for the current condition. It can also evaluate a condition without altering the weight center.
Part C of this regulation is a more typical criterion with a residual righting energy requirement and a formula for the towing heeling arm. Calculation of Parts B and C can be performed individually or together. Both the GM in Part B and the heeling arm in Part C depend on the displacement, so the wizard updates these values for each displacement in the MAXVCG series. Some sample MAXVCG results are shown below. |
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Whenever possible, wizards are developed as two separate files. One file is the "front-end" which address input, output options, and data storage. This file is typically named with a .WIZxx extension where xx is a suffix that sorts the wizards into categories in the Wizard drop-down menu. The *.WIZ files are comprised primarily of template and macro commands.
The second file, a library file (*.LIB), is responsible for all the calculations performed by the wizard. The library file is maintained as a separate file so that it can be called directly from a run file. If the wizard is designed to support run file use, it will leave behind a LibInfo template after it is run. You can execute the LibInfo template to see the variables which allow you to direct the wizard library to perform the tasks you need. |
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| This wizard deals only with the CFR towing criterion. If you would be interested in a wizard for another criterion, please let us know. |
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Questions, comments, or requests?
Contact Creative Systems, Inc. USA phone: 360-385-6212 Fax: 360-385-6213 Office hours: 7:00 am - 4:00 pm Pacific Time, Monday - Friday Mailing address: PO Box 1910 Port Townsend, WA 98368 USA Click here for an index to this and previous COWs |