POSEIDON ND Tutorial

Sujets

• Sizing Up
• Aspirant
• Valuese Sao Taliu
• Bulkhead
• Arrangement avec répétition
• GLUT

Informations

• Publié par: Naphong
• Nombre de lectures: 746
• Langue: English
• Poids de l'ouvrage: 1 Mo

Extrait

Contents POSEIDON ND POSEIDON ND Tutorial 1 Introduction 3 2 A Midship Section - from Concept to Sizing 6 2.1 Design Parameters and Concept Sketch 7 2.2 Principal Dimensions and Material 9 2.2.1 Input of the Principal Dimensions 9 2.2.2 Material definition 10 2.2.3 Storing the Project 11 2.3 Frame Table 12 2.3.1 Generation of a Frame Table 12 2.3.2 Changes in the Frame Table 14 2.4 The Wizards of POSEIDON 15 2.5 Modeling of Longitudinal Members 17 2.5.1 Definition of the Frame Table (Y and Z Dir) 17 2.5.2 Defi Geometry and Topology 18 2.5.3 Plates, Stiffeners and Holes of Longitudinal Members 23 2.5.4 Arrangement of Transverse Stiffeners on Longitudinal Members 36 2.5.5 Arr Transverse Girdersbers 38 2.6 Modeling of Transverse Members 40 2.6.1 Cells 40 2.6.2 Transverse Members 46 2.7 Design Criteria or Loads 53 2.7.1 Tanks 53 2.7.2 Design Criteria Stillwater Bending Moments and Shear Forces 57 2.8 Sizing of a Transverse Section 59 2.8.1 Sizing of all Members at Frame 154 in accordance with the GL Rules 59 2.9 Permissible Stillwater Values 62 2.9.1 Stresses for Deck and Bottom Structures 62 2.10 Assessment of the results of a Transverse Section 63 2.10.1 Correction of the Transverse Section 63 2.10.2 Duplicate calculations in the GL Rules program 66 POSEIDON Tutorial 1 Contents POSEIDON ND 3 Generation of a Further Transverse Section 68 3.1 New shell description at Frame 68 and 76 68 3.2 Automatically generated Frame Shapes 69 3.3 Definition of a cross section with new structural information 70 3.4 Fitting the Plate and Stiffener Arrangement to the changed cross section 72 4 A Transverse Bulkhead at Frame 76 75 4.1 Description of Bulkhead components 75 4.2 Geometry of Cells for Bulkheads 77 4.3 Plate Arrangement 78 4.4 Stiffener definition on a bulkhead 79 4.5 Definition of girders on a bulkhead 81 5 Generation of a FE - Model 82 5.1 Abstract 82 5.2 Parameters of mesh generation 83 5.3 Boundary conditions 84 5.4 Definition of the loads to generate 85 5.5 Mesh generation in longitudinal direction 86 5.6 Start the model generation 87 6 A Bulker example 89 6.1 The Wizard for Bulk Carrier 89 6.2 Built-up Web Frames and Transverse Girders 90 6.3 Decks with cargo. 93 7 Input of a Transverse Sections without a Frame Table 94 2 POSEIDON Tutorial Introduction POSEIDON ND 1 Introduction The purpose of this tutorial is to present a method of using POSEIDON ND accompanied by examples. To this end, the individual work steps and inputs to complete the given tasks are presented. The user is led through the individual program sections and can easily understand the solution to the tasks. There are many cross references to the Reference Manual and to the Online Help function that clarify the various input alternatives. At the beginning of each section of the tutorial the problem to be solved is described. Furthermore the prerequisites from previous sections which are necessary for its solution are presented. The POSEIDON ND TreeView reflect, in its order, the fundamental work steps. General Please follow the advice for the configuration of the POSEIDON ND program, which is to be found in the POSEIDON ND User's Guide, in order to print PON ND files, properly install the example files onto your hard disk and to use the individual settings for colors, typefaces, etc. POSEIDON ND’s Online Help may be invoked at any point within the program using the F1 function key or the 'Help for active view'-Button . The help description, which corresponds to the current display, will be shown. Printing For a direct printout of the actual window, please use the Print-Button . The print command can be used in all POSEIDON ND displays. Note: If you use the Print Preview Button ,the printer output will be displayed on the screen. Here you can set your own individual settings for printer-and page layout. Graphical output An active preview plot window is available in most POSEIDON sections. Note: By clicking the right mouse button on the plot preview window, you can choose the print command or the print preview command. Use the plot button to view all graphics on the screen in a separate window. By pressing 'p' on the keypad, the actual content of the plot window will be send to the printer. Plot all plates and profiles, for example, in Section Hull Structure, Longitudinal Members: Plate Arrangement. There, you have additional control over determining what is to be plotted. Input TMPOSEIDON ND is using Windows standard functions. It is possible to use the commands cut, copy, paste in all child windows by clicking the right mouse button or using the corresponding buttons of the toolbar. A star in the left column of the input grids marks a new input line, containing proposals. A pencil marks a line in edit mode. A plus marks a line of a 'Super-Grid'. By clicking the plus you get the second input level of this grid. (see: definition of 'Functional Elements' for example) POSEIDON Tutorial 3 Introduction POSEIDON ND How to use this manual The experienced user may possibly find the descriptions in the individual chapters to be too detailed. Therefore, a short instruction of the work steps to be followed is given in the text lines marked with an ⇒. Several definitions and conventions, which are frequently used within the tutorial, follow: Definition: Section. The sections of POSEIDON ND are shown by folders in the TreeView on the left part of the main window. A selection has to be made in order to reach the actual input display. This process is described with the help of sections. So the example: Switch to Section 2.1.1 ' Wizards ! Transverse Section ! Container Ship' ' means the selection of folder no 2 in the main-tree and, following that, the choice of folder no 1 in the sub-tree. Conventions: Italics Inputs, which the user has to make, are printed in italics. Frame No Name of a column or input field ⇒ Summary of the inputs described in the following section. Figure 1: TreeView The tutorial describes the typical procedure for sizing a container ship in accordance to the GL Rules with the help of POSEIDON ND. The generation mechanism of POSEIDON and the various input techniques are introduced. It is shown how the sizing can be accelerated considerably by working efficiently with POSEIDON. It is recommended that the users themselves practice using the computer and follow the work steps, which are given in the tutorial. 4 POSEIDON Tutorial Introduction POSEIDON ND Figure 2: POSEIDON ND main window POSEIDON Tutorial 5 A Midship Section - from Concept to Sizing POSEIDON ND 2 A Midship Section - from Concept to Sizing This chapter describes the modeling and the sizing process of a midship section. The process is subdivided into the following individual steps: • concept sketch for a midship section, • input of the characteristic ship data / principal dimensions, • generation of a frame table in the ship’s longitudinal direction (X axis), • geometric and topologic description of the shell, inner bottom, bulkheads, decks, girders, transverse members, etc. for various frames, • arrangement of plates, stiffeners and holes on these Functional Elements, • input of the design-loads, which have an influence on the sizing of plates and stiffeners in accordance with the GL Rules (cargo static, dynamic, tanks with corresponding medium etc.), • input of the permissible design bending moments and shear stresses, • iterative sizing in accordance with the GL Rules, varying loads and corrections on members. The complete input described in this tutorial is also contained in the file TUTOR_ND.POX that is loaded on the POSEIDON ND CD-Rom. 6 POSEIDON Tutorial A Midship Section - from Concept to Sizing POSEIDON ND 2.1 Design Parameters and Concept Sketch Problem Collection of the characteristic ship’s data, which are necessary for the sizing of the transverse section. Requirements This step does not require the prior completion of any POSEIDON ND program section. In this example the ship’s characteristic dimensions and design parameters are as follows: Ship Type: Container Ship „CONTEST“ Class: 100 A5 Germanischer Lloyd Lpp: 230 m LwL: 234 m B: 32,25 m H: 18,3 m T: 13,5 m T : 6,6 m B c : 0,65 B V : 23 kn 0 Floor spacing: 3.060 mm Transverse frame spacing: 765 mm The abbreviations conform to the syntax in the Germanischer Lloyd Rules, Part 1 Chapter 1. For more information call the Online Help for this section. POSEIDON Tutorial 7 A Midship Section - from Concept to Sizing POSEIDON ND For the first pictorial representation of the midship section, a concept sketch has been made up. Figure 3: Concept Sketch of a Ship design 8 POSEIDON Tutorial A Midship Section - from Concept to Sizing POSEIDON ND 2.2 Principal Dimensions and Material Problem Input of the principal dimensions, allocation of a project name, saving of the input in a file. Requirements POSEIDON is individually configured (see the Installation Manual). 2.2.1 Input of the Principal Dimensions ⇒ Switch to Section 1 'General' and enter a project name, project description and the Principal Dimensions according to the values given above. After starting POSEIDON, choose in the TreeView Section 1.1 General Data. You see a tabbed form for project data, principal dimensions, additional principal dimensions in case of ice class and a description of the waterline in damage condition. Please enter a project name and the authors name. The description field makes it possible to give a detailed description of the project. Choose the second tab 'Principal Dimensions' and enter the values given above(see Figure 4). POSEIDON ND automatically calculates the GL scantling length L. In our example inputs for ice class and for waterline of damage are not necessary her