The objective for SIC Hydrostatic Analysis application is to provide naval architects who are doing ship conceptual design with CATIA V5, with a set of basic tools directly available from within their native CATIA design environment to perform most common hydrostatic analysis calculations. In this way, naval architects are able to easily get the most frequently required naval calculations, thus enabling them to quickly validate a new ship concept design, directly from within the native design environment. No need for cumbersome interfaces to get these simple, common naval calculations done.

Naval architects would only need to interface with standard naval architecture packages (such as Napa, Tribon Initial Design, Proteus, or MaxSurf) at the end of a design cycle, when a new ship concept is approaching maturity, and requires approval by some external authority.

End User Benefits

The main capability of Hydro Static Analysis product is calculation of HydroStatics Properties and Stability of ship. The product will help to designer to analyze HydroStatics properties, define compartments length in proper way, perform weight and damage modeling, define operating environment and analyze stability and longitudinal strength of ship.

CATIA Application Product

SIC HydroStatics Analysis - This poduct is developed by Digital Shipbuilding Innovation Center(DSIC or SIC). SIC was created by The State Marine Technical University of Saint-Petersburg, Russia, with participation of Dassault Systemes, IBM EEA Ltd. and IBM World Trade Corparation.

Purpose

SIC HydroStatics Analysis product performs calculations used by naval architects to predict the stability of a ship under a wide range of loads and external forces both when it intact and when partially flooded or damaged.

The product improves the entire ship prelimenary design process by helping naval architects quickly analyse HydroStatics properties, define compartments length in proper way, perform weight and damage modeling, define operating environment and analyze stability and longitudinal strength of ship.

Type

Being CAA product, SIC HydroStatics Analysis has strong integration with CATIA V5. SIC HydroStatics Analysis can be used in cooperation with other CATIA V5 products such as Generative Shape Design, Strucure Preliminary Layout and Knowledge Advisor.

CATIA Prerequisites

CATIA V5R14 SP3.

Operating System Requirements

SIC HydroStatics Analysis product has the same operating system sequirements as CATIA V5. currently the porduct exists for Windows operating system only.

Technical Description

Input and Output Data Description

To start work with HydroStatics, the end user needs to have ship's complete hull form definition represented by surface elements created with Generative Shape Design features. The Wrapping Surfaces created with Strucure Preliminary Layout can be used also.

The output results of HydroStatics analyses are represented by specific features that can be used for visualisation of analyses, can be used indise Knowledge Advisor rules and checks, and for diagrams generation.

Typical User Scenario

The following figure outlines the typical scenario that user can perform using existing CATIA V5 and Hydro Static Analysis capabilities.

Functional Specifications

• Volume displacement
• Length between perpendiculars
• Length of waterline
• Breadth of waterline
• draft at midship
• Center of buoyancy
• Block Coeff
• Midship Section Coeff
• Waterplane Coeff

Floodable length calculation

Once user has defined hull form, it is possible to begin general arrangement design. The core task is to define position of main bulkheads. Solving this task, designer use a lot of different information and among the most important things is Floodable Lengths Diagram. The Floodable Lengths Diagram examines the effects of single compartment flooding, and allows to identify maximum compartment length at given compartments center position. This will help to user find out right positions of bulkheads from sinkage resistance point of view. Making Floodable Lengths calculations, user has to provide inputs as follows:

• The wrapping surfaces
• Vessel's margin line

As the result user will get:

• The size of compartment which will sink the vessel until its waterline is a tangent to the margin line.
• For each longitudinal position of compartment center, the compartment length, draft, trim, and initial stability can be calculated.

Results may be obtained at multiple compartment permeabilities per run. The results may be represented on drawings.

Load Cases

Weight modeling is absolutely necessary for assessment of ship stability. Without the gravity force being taken into account there can be no assessment of stability. User can define as many load cases as he wants, but at least Load Case must exist. This Load Case can be very simple. With increasing functionality and availability the kinds of Load Cases can be specified as follows:

• Explicit input magnitude and center of gravity.
• Import a table of weight distribution along length.

Floatation Position

Floatation Position takes as input "Reference Elements" and "Load Case" and has output properties

• Center of buoyancy
• Drafts
• Trim and heel

Longitudinal Strength

"Longitudinal Strength" takes as input "Reference Elements" and "Weight Distribution Load Case" and has output properties

• Maximum Bending Moment
• Maximum Shear Force
• Graphic represhentaion of diagrams

Righting Arm Diagram

Righting Arm Diagram takes as input "Reference Elements" and "Load Case" and has output properties

• Maximum arm
• Angle of Maximum arm
• Angle of Deck Immersion
• Angle of Vanishing
• Square of Diagram for given Trim angle
• Graphic represhentaion of diagram

Data architecture scheme

SIC HydroStatics Analysis integrated with CATIA Product structure. All HydroStatics features and extentions are stored in dedicated applicative container in CATProduct and/or CATPart documents.