Scope of Application
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General Hydrostatics/stability/strength
-- applies to all ships of any size, type and any floating structure
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Vessel design
-- easy model building and modification; simulation-oriented calculations
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Trim and Stability book preparation
-- all required calculations and graphs
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Onboard Loading Computer
-- customized and packaged to support on-board vessel operations; configurable by GHS user
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Drilling unit stability
-- rig wizard for finding critical axis, automated max VCG intact and damaged
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Hopper dredge stability
-- mud lag and water-over-cargo
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Salvage applications
-- accurate simulation with grounding, pulling, pressurized tanks; multiple bodies
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Oil-spill calculations
-- amount of oil spilled based on observed condition of vessel
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Tonnage
-- Component volume reports for International Tonnage
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Launching calculations
-- ship interaction with ways and water, automated sequencing of launching steps through the macro command language
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Grain loading
-- treats grain shift either in specially-constructed bulk holds or general cargo holds
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Drydocking calculations
-- easily-combined ship and dock geometry; graving dock grounding, block crushing force; multi-body application
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Submarines
-- critical GM vs tank load (optional AF module); resolving load imbalances
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General-purpose task automation
-- many file and text processing operations can be automated using GHS -- this html page is GHS output!
Geometric Modeling Tools
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Hull modeling tools
-- digitizing and offset input/editing
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Tank modeling
-- parametric - powerful and efficient
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Complex models
-- multi-level geometry structure facilitates complex modeling
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Model detailing support
-- deck camber, shell thickness, appendages, deductions, sounding tubes, etc.
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Deck edge and margin definition
-- automatic and editable deck edge; linear or parabolic margin distances
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Wind drag details
-- shape and effectiveness coefficients at component level
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Import/export
-- several formats supported: DXF, IDF, SHCP, etc.
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Geometry viewing and editing
-- various views, complete detail
Calculating Essentials
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Standard curves
-- curves of hydrostatic properties, cross curves, righting-arm curves, max VCG curves, etc.
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Load condition reports
-- flexible status reports displaying all information at various levels
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Condition Graphics
-- flexible plan, profile, body views showing current loads and waterplanes (optional CG module)
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Free surface treatment
-- actual CG shifts or free surface moments (FSM)
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Free surface moments
-- True, maximum or user-specified; also FSM floors
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Deflection
-- hog and sag derived from given drafts; or bending analysis (with optional LS module)
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Inclining
-- complete displacement and CG calculation from inclining data; inclining wizard
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Intact stability
-- righting arm curves for load cases
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Damage stability
-- lost buoyancy -- otherwise same as intact
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Probabilistic damage
-- Several versions including latest cargo and passenger rules with user-supplied PS methods (optional AF module)
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Stability criteria
-- flexible and comprehensive
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Roll angles
-- direct input or by IMO formula
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Critical points
-- flooding and weathertight, one side or symmetrical
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Freeboard
-- minimum distance to deck edge with and without margin
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Lateral plane and Wind plane
-- heeling moment derivations
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Heeling moments, wind
-- wind forces derived from geometry -- lateral plane or projection in any direction (respecting heel, trim draft and axis)
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Heeling moments, tank
-- simulating water on deck, grain shift
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Heeling moments, other
-- from turning, CG shift, direct input
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Water on deck
-- several methods address various regulations
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Waves
-- several types, adjustable height, length, phase and encounter
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Maximum VCG
-- curves or individual condition; also import of Max VCG/min GM
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Intermediate flooding
-- Support for flooding in stages using added weight in tanks
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Grounding
-- Up to 400 ground points allowing detailed ground models
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Adjustable heeling axis
-- supports finding most critical axis of drilling units
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Floodable lengths
-- Compartment lengths limited by margin line or GM (optional FL module)
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Longitudinal Strength
-- shear, bending moment, deflection, torque (optional LS module)
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Tank characteristics
-- Tables and plots of tank properties
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Tank Soundings
-- several flexible formats - soundings, ullages (optional TS module)
Special Calculations
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Dynamic Stability
-- Dynamic stability evaluations according to IMO Second Generation Intact Stability.
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Seakeeping
-- Seakeeping and hydrodynamic analyses.
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Variable axis mode
-- RA curves and max VCG with variable axis for structures without a definite critical axis.
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Grain loading
-- using girder depth and distance
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Grain Shifting
-- volumetric heeling moments from complex grain shift (optional GS module)
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Damage control
-- simulation of effects of counter flooding, etc.
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Multi-body interactions
-- several floating bodies with points of interaction, latched or free to lift off (optional MB module)
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Multiple tank modes
-- intact, flooding, spilling, damaged, bubble, WDF, deck water, frozen
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Tank calibration
-- using tank property tables from an external source
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Tank gauging
-- interface to tank instrumentation - several protocols available
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Expansion of oil
-- volume expansion due to temperature changes
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API petroleum density
-- density via API degrees and temperature - gross and net volumes
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Trimming moment
-- direct input, various functions
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Thruster simulation
-- side thrusts contributing to heeling moments and weight/buoyancy forces
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Pull simulation
-- arbitrary force in any direction contributes to heeling and trimming moments as well as weight/buoyancy forces
Input Faculties
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Command language
-- powerful, efficient macro language
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User variables
-- allowing complete control of run and special calculations
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Templates
-- user-programmable dialog boxes and wizards
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Load Editor
-- interactive tank and nonliquid load changing with graphical displays
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Project system
-- project folder management
Output - Reporting
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Flexibility
-- user-controlled report sequences and variations
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Annotation
-- includes user-formatted calculations and reports
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Optional styles
-- plain and fancy
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Graphs in reports
-- automatic graph generation
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User-designed graphs
-- plotting curves from any data -- unlimited possibilities
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Report preview
-- on-screen preview of report with graphs
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Report exporting
-- copy-and-paste text and graphs, PDF-Machine compatible
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Report sharing
-- GHS reports with graphics can be viewed and printed from any computer using the free GHSPublicPrint.exe program
Support
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Documentation
-- complete, accurate, usable - printed and on screen
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Support
-- fast and knowledgeable
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Training
-- Available as needed
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Recognition
-- widely accepted; excellent reputation for accuracy
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Endorsement
-- ABS, Lloyds, DNV and others
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Programming Interface
-- Allows user-developed plug-ins (optional PI module)
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GHSCOM
-- allows any program using Microsoft COM technology to interact with the GHS engine (optional GHSCOM module)
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Operating system
-- Windows, any recent version; Apple adaptation; versions for older OS available
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Security
-- USB, parallel-port and server dongles
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Companion software
-- midship section calculator by VSW
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CAD direct to GHS
-- Rhino exporter to GHS Geometry
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