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ShipWeight presentation

ShipWeight presentation. BAS engineering AS. BAS engineering. Located in Ålesund, on the western coast of Norway Developing and selling ShipWeight and other marine software since 1996 Developing NAPA macros for the ship industry

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ShipWeight presentation

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  1. ShipWeight presentation BAS engineering AS

  2. BAS engineering • Located in Ålesund, on the western coast of Norway • Developing and selling ShipWeight and other marine software since 1996 • Developing NAPA macros for the ship industry • Participating in weight projects in the Norwegian oil offshore industry • Consulting work on weight control and historical data aquisition. ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  3. The purpose of ShipWeight

  4. Weight control • The main purpose of ShipWeight is weight control: • Weight estimation/weight budgeting • Weight monitoring/weight tracking • Structuring of asbuilt ship data • Optimizing the resources used on weight control ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  5. Why weight control? • Avoid contract claims • Fulfill general vessel specifications • Cost control • Documentation (change orders) • Input for operations • Improve future weight estimation • Sale and promotion advantage • ”Insurance” ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  6. Concept and system architecture

  7. System goals • Combine the structure of a database with the calculation power of a spreadsheet • Make structuring and reuse of weight data as easy as possible • Same system for all weight tasks • The user is always in control • Consistency in historical data • Flexibility to be used on a macroscopic as well as a microscopic level ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  8. ShipWeight concept • Divide the vessel into weight groups. A work breakdown structure (hierarchy) is used for this purpose. • Apply an estimation formula (method) to each weight group. Allow the user to compose the total (cumulative) estimation formula by selecting the weight groups to be calculated. • In each weight group, estimate weight and center of gravity based on past ship data. ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  9. The work breakdown structure • The ShipWeight work breakdown structure is a hierarchy of weight groups • More than 300 weight groups are structured into 6 levels ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  10. Example - Steel methods: Level 3-4 Methods based on main particulars Level 5 Methods based on volume Level 6 Methods based on area, length, and density Main hull (Level 3) Weight = k•Lpp•B•D•Cb0.5 LCG = k•Lpp VCG = k•Dud Cargo area (Level 4) Weight = k•V Deck (Level 5) Weight = k•p•A•t Estimation formulas ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  11. Technical solution • ShipWeight contains 2 applications... • AsbuiltWeight; for monitoring and tracking of weights for ships under construction (or already built ships) • DesignWeight; for estimating weight of new ships • …and a common database where data from AsbuiltWeight is made available for estimation in DesignWeight ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  12. Database structure DESIGN AS-BUILT application application compare project databases filter Common database ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  13. Work flow • Design data exported to Asbuilt when entering contract • During construction, Asbuilt data is compared to Design • Asbuilt project is exported to common database upon completion ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  14. Continue ”estimation” during construction Right Wrong ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  15. Estimation

  16. Estimation concept • When estimating a weight group for a new vessel, all coefficients k from a custom selected set of reference ships are plotted in a graph • A trendline appears in the graph based on regression analysis. • The graph and trendline are tools to select an appropriate coefficient k for the new vessel ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  17. Estimation concept • The selected coefficient k is used to calculate the weight of the specific weight group ( e.g. W = k * L*B*D ) • The sum of all weight groups gives the estimation for the total weight of the vessel ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  18. Estimation basics • Select reference ships • Prepare past ship database (common database) • Select vessel-type (default = main type) • Apply screening criteria in graph • Select ratio coefficient • Execute estimation for weight group ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  19. Prepare common ship database Ship-database of previous projects ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  20. Selection of shiptype • Filtering the ship-database with regard to shiptype ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  21. The Estimation dialog box The Estimation dialog box consists of graph-, method- and comparison-areas ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  22. Limiting values of the plot  The Comparison-area ofthe estimation dialog box ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  23. The coefficient-line control box  The Graph-area of theestimation dialog box ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  24. The Methods-area of theestimation dialog box ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  25. Uncertainty calculation • A quantification of the uncertainty can be assigned to each estimation • Parameters in the estimation method gets subject values from the user • The uncertainty value of the coefficient can be (but does not have to be) calculated by the program • The total uncertainty for each weight group and for the total weight is calculated by using successive calculation ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  26. Monitoring

  27. Monitoring basics • Weight items are entered into corresponding weight groups in the WBS and summarized to give the total weight of the group (W). • Calculation method parameter values are entered. ( e.g. W = k * L*B*D ) • ShipWeight calculates the coefficient k when exporting to the common ship database ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  28. Entering Experience Data • Weight items can be entered in by hand or imported from various file formats • It is important to: • To establish as many weight groups with 100% weight (CoG) as possible • Obtain estimation parameters for the methods belonging to the complete weight groups ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  29. Entering weight andcenter of gravity by hand • The items dialog box • The sum of weight items forms a weight group ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  30. Entering ship parameters • The Methods dialog box • Estimation-, Plot- and Comparison- parameters ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  31. Overview of parameters • The numerical value indicate the number of missing parameters • Estimation- and Plot-parameters must be 0 prior to export ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  32. The imported data must be in correct order Import of data • Data can be imported from ASCII files • Spreadsheets can easily be converted to ASCII format ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  33. Utilizing project-codes • Possible project-codes: • Section • Area • Functional • Module • Discipline • Installation • Weight status • Phase ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  34. Defining code-structures • Codes can be defined as a hierarchical structure • Weights are tagged to code-structures either as single weight items in the Items dialog box • …or as groups of weight items in the Codes dialog box ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  35. Code structure features • Lists and reports can be produced according to codes • Area limits can be attached to codes generating visual error checks (code envelopes) • Custom code mapping between the different codes ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  36. Additional features

  37. Additional ShipWeight features • Auto estimation • Weight distribution curve • Move center of gravity (bulk moving weights) • Gyration values • Equipment database • Control against budget • Reporting ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  38. Auto estimation • Auto-estimation is a jump-start estimation by extracting coefficients automatically according to settings from the user • An auto-estimation can be adjusted after the automatic estimation ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  39. Weight distribution curve • To obtain the weight distribution curve, aft and fore values must have been entered for the weight items • The curve can be exported to a number of formats ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  40. Move CoG • Bulk moving of weight items is easy • Selections can be made according to codes and/or limit restrictions • Longitudinal extent is handled by users choice ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  41. Gyration values • Gyration values are calculated from using the Steiner’s theorem, but neglecting the inertia around the single weight item itself ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  42. Equipment database ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  43. Check against the weight budget ShipWeight 6.0 presentation – BAS engineering Runar Aasen

  44. Reporting • A number of standard reports are available from the menu • Reports can be exported to MS Word, MS Excel or ASCII (text) format ShipWeight 6.0 presentation – BAS engineering Runar Aasen

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