Autohydro

Hydrostatics and Stability Program

Autohydro the state of the art hydrostatics/stability program, performs intact and damaged analyses and produces customized stability reports which are accepted by all major governing approval bodies.

Autohydro Key Features

• 32 bit code, resulting in faster processing
• Extensive model building capabilities
• Display of current attitude in three views Interactive user interface
• Command line or run file operation
• Exact free surface correction
• User-defined stability criteria
• macros and menu structures
• Generation of fully editable report with graphs
• Supports digitizers with Wintab drivers
• Automatic report generation including
        - Hydrostatics, cross curves and righting arms
        - Longitudinal strength calculations
        - Floodable length calculations
        - Tank capacities, sounding/ullage tables
        - MaxVCG
        - IMO probabilistic damage calculations
• input either distributed or point load weights in user-defined groups
• calculate torsion moments for all ship loading conditions
• calculate moments of inertia (about all three axes) are calculated for all tank loading conditions and displays information in the tank dialog window
• user can define moments of inertia(about all three axes) for the lightship
• user can define moments of inertia (about all three axes) for the added weights
• vessel total moments of inertia(about all three axes), radii of gyration(about all three axes), and rolling and pitching periods are calculated and displayed
• input, delete and select a maxvcg curve to accomplish quick maxvcg margin checks. In a damaged case, the maxvcg margin will be based on the relevant intact condition
• calculate constant weight by new draft comparison routine
• view the section in the body view on any specified longitudinal location on the profile view
• read data from draft and tank sensors
• handle geometry files with more than 32,767 points

Autohydro is a complete hydrostatics and stability calculations program for naval architects, ship designers and marine engineers. A true 'floating simulator', Autohydro reports the reaction of the model to various conditions, such as a loading configuration, a damage situation, conditions involving outside forces, wind or high speed turning momentum or some combination of these. Autohydro can also be used to obtain hull form characteristics and capacities. Vessel attitude is displayed graphically and in text on the screen. Report information, text and graphs, can be shown on the screen, edited, printed, saved or exported to other Windows applications.

Vessel Model

Entire vessel models may be generated in Autohydro or the user can import hull shapes from Autoship and then add geometry such as tanks, compartments and superstructure. Vessel models are defined by transverse sections, which can be entered by using a digitizer or by typing in offsets, or defined by creating a combination of primitive shapes such as cones, boxes or surfaces of rotation. These objects can be fit or joined to the hull or to each other. Tank contents, effectiveness and specific gravity relating to each component as well as sounding tubes and margin lines can also be defined.

Interactive & Run File Modes

The user has 3 methods for performing calculations. The pull down menu system can be used for most loading condition set-ups and simple calculations. Individual commands can be typed in for more complex calculations. Or the run file editor can be used to organize many commands for lengthy calculations and to generate in-depth reports. The run file editor has a built-in error checker to verify all commands. Users can develop a library of run files for future use and modification.

Windows

Autohydro operates under Windows and provides a graphic, intuitive interface. The main screen shows Profile, Plan and Body View plus a full report of current vessel attitude including Draft, VCG and GM with FSM.

Conditions

Autohydro will calculate using tanks, cargo spaces and compartments in intact, damaged, frozen or spilling conditions. Waves and wind velocity and direction may be specified. As well, Autohydro calculates for high speed turning and grounding situations.

Output

Full reports and graphs of loading, longitudinal strength, stability, righting arms and hull parameters can be produced, edited and saved or sent to the printer. As well, Autohydro can evaluate stability with regard to published stability criteria and a warning is issued if the limit is not met. Output from Autohydro has been accepted by all major governing bodies such as Lloyds, Det Norske Veritas, ABS and the U.S. and Canadian Coast Guard.

Custom Reports

Edit reports off-line either using Autoship Report Editor or MS Excel. Format Reports and use Excel marcos to automate report formatting. Calculate additional values from results produced by program. Generate reports in either A4 or 8 1/2" X 11" format.

Autohydro: Standard version: Intact stability, handles up to 25 tanks.

Autohydro Pro: Advanced version: Intact and damage stability for unlimited number of tanks, longitudinal strength calculations and IMO Subdivision Index for cargo vessels.

Hardware required: For optimum performance we recommend a fast Pentium with 16 MB of RAM, 10 MB free disk space, 1 MB graphics card and an SVGA monitor.