Production Overview

ShipWeight is a weight engineering software tool useful for weight estimation as well as weight monitoring and tracking. ShipWeight can be used from the early conceptual design work, based upon parametric regression of historical data, and all the way through production until the vessel is launched.

In addition to weight estimation and weight monitoring, ShipWeight features weight distribution curves, calculation of gyration values, center of gravity sanity checks, uncertainty calculation and more.

The weight reports and reporting system are very powerful and may be tailored to meet each customer's desire, both on layout and graphics as well as the data to be presented.
ShipWeight can be set up in a multi-user environment with permission control and login, running on an SQL database. It is also highly adaptable to any organization with regards to work breakdown structures, and customized import and export of information between ShipWeight and other software tools within the user organization.

Shipweight Benefits

In a low-margin market, reduced margins must be met with higher confidence in preliminary weight estimation and better weight control
during construction of the vessel.

Yet, many ship designers and ship builders does not appreciate this point and use old methods and tools, treating weight and center of gravity in a random and unstructured way. ShipWeight may help getting this important activity organized and under control.

Combine the structure of a database with the calculation power of a spreadsheet
Systematic approach through work breakdown structure (SWBS) makes structuring and reuse of weight data as easy as possible Same system for weight estimation and weight tracking.

Shipweight Concept

The ShipWeight concept is based upon the realization that in an early stage of the design process, weight and center of gravity must be estimated on the basis of past ship data.
This requires a tool which to the greatest extent can structure and make reuse of weight data as easy as possible.

Using breakdown structures, ShipWeight divides the ship into weight groups containing information on weight, center of gravity and other relevant information.
A specific formula for weight estimation is attached to each weight group.

ShipWeight Estimation

Estimation of weight and center of gravity is done according to the breakdown structure. In every weight group an estimation method of the form
Weight = coefficient * parameters is attached.

To obtain the right coefficient for an estimation method the coefficients from relevant ships are plotted in a graph. By setting parameter criteria only relevant coefficients are plotted in the graph. A regression line is inserted according to a plot parameter to help the user select the right coefficient. When a coefficient is selected, the weight is estimated.

ShipWeight Monitoring

Monitoring means first and foremost to fill in weight and weight relevant information into the weight groups of ShipWeight. The user can use the work breakdown structure in any extent he wants and, of course, fill any number of items into the weight group. As well as entering weights for each weight group it is important to enter specific parameters for that weight group to obtain the estimation coefficient for use in later estimation.

ShipWeight Reports

Combined with Crystal Reports, ShipWeight gives you the opportunity to design, explore, visualize, and deliver reports via the web or embedded in enterprise applications. it enables users to create reports with stunning visualizations, conduct on-report business modeling, and execute decisions instantly from the report itself.

ShipWeight Navisworks Plugin

With the ShipWeight Navisworks plugin you can do visual sanity checks during estimation and monitoring. The plugin displays center of gravity and extension in 3D for all parts of a project contained in a ShipWeight database.

You can select a particular item by clicking on it or by selecting it from a tree-view. The item is then highlighted and information about it is displayed in Navisworks' 'Properties'- window.

ShipWeight Rhino Plugin

With the ShipWeight Rhino plug-in you can do visual sanity checks during estimation and monitoring. The plug-in displays center of gravity and extension in 3D for all parts of a ship contained in a ShipWeight database. There are two modes of display: Line-display and box- display. Line-display shows center of gravity and extension of all items in each direction, box-display shows center of gravity and a 'bounding-box' defined by mm and max values of LCG,TCG and VCG (if available).

You can select a particular item by clicking on it or by selecting it from a tree-view. The item is then highlighted and information about it is displayed in a window. By filtering on weight classes or individual items you can choose which items to display when rendering.

To use the Rhino Plugin you just need Rhinoceros 3D installed. Download an evaluation version here -just add your email and country.

ShipWeight Features

Some of the ShipWeight features besides general weight/CoG estimation
and monitoring are:
- Weight distribution curve
Distribution data can be exported to file formats for import to other design systems (NAPA, GHS, AutoShip).
- Gyradius key values
Values for roll, pitch and yaw as well as combined motion values
- Comparing projects
Any project can be compared on a weight group level. This is valuable when analyzing the deviation between estimate and monitoring projects.
- Uncertainty and successive calculation
Taking uncertainty into account when estimating
- Equipment database
ShipWeight is shipped with an equipment database which the user can edit to obtain a relevant equipment database for putting equipment weights into an estimation project.