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An automated computational tool for offshore supply vesselsrsquo; structural preliminary design

Richard D. Schachter¹ Ricardo S. Gomes Jr.¹

Received: 9 January 2019 / Accepted: 26 July 2019 / Published online: 21 August 2019 copy; Sociedade Brasileira de Engenharia Naval 2019

Abstract

This work presents the application of the rules of the Classification Society American Bureau of Shipping (ABS) for steel vessels in a development of an Excel computational tool that allows to speed up the preliminary structural design calculation process, from several days to minutes, with no precision loss, based on the main particulars and a few structural characteristics, automating everything that does not depend on decision-making. This tool is intended to be a first of a few to perform the required calculations for the preliminary structural design, in this case, applied to Offshore Support Vessels. Once the frame type, the selection of the commercial steel type, and manufacturer are prescribed by the user, all the rules are automatically calculated, all the thicknesses are computed and presented, and rounded up to the commercial values and which reinforcements need to be dimensioned are defined. The user then should dimension these structural elements by selecting the profile type, thickness and height of the web, and thickness and length of the flange, such as stiffeners and/or girders of the bottom, double bottom, sides, double sides, decks, and bulkheads; solid and open floor, side stringers, frames, bottom and deck girders, deck transverses, bulkhead girders, and webs. Besides verifying if the structural strength values are in accordance with the classification society rules in each and every step of the dimensioning process, the program also shows a sketch of the Midship Section that is redrawn at each decision change of the user. The program also verifies the global structural resistance; calculates the steel area, the hull girder section modulus, and moment of inertia; compares these values with the minimum rules requirements; and analyzes if the ship fulfills the longitudinal resistance. Soon after, based on the midship section, the sectional area and the transverse bulkheads positions, the program estimates the steel weight, and center of gravity of the ship. Finally, the user can generate a detailed Report that contains all the information produced by the program, as well as the calculation memory. An application example is presented.

Keywords：Structural preliminary design；Offshore supply vessels；Computational tool

近海供应船结构初步设计的计算程序研究

理查德D.沙赫特¹ 里卡多S.戈麦斯Jr.¹

接收日期：2019年1月9日/接受日期：2019年7月26日/在线发布日期：2019年8月21日copy;巴西海军工程学会2019

摘要

本文介绍了美国船级社对钢制船舶的规范在开发Excel计算程序中的应用，该计算程序基于主要资料和一些结构特征，可以将初步结构设计计算过程从几天缩短到几分钟，而无需进行任何操作，自动化除决策过程外的所有流程。该计算程序是为数不多的适用于海洋供应船初步结构设计计算的程序之一。用户确定了骨架型式、工程钢型号和制造商后，将依照规范自动计算，计算并显示所有厚度，并四舍五入为工程值，并定义需要标注尺寸的钢材。然后，用户应通过选择剖面类型，腹板的厚度和高度以及翼板的厚度和长度来确定这些结构构件的尺寸，例如底部、双层底、舷侧、双舷侧、甲板和舱壁的加强筋和/或纵桁；空架肋板和实肋板、舷侧肋骨、肋板、底纵桁和甲板纵桁，甲板横梁、舱壁横梁和腹板。除了在尺寸标注过程的每个步骤中验证结构强度值是否符合船级社规范外，该程序还显示了船中剖面草图，该草图在用户每次选项更改时都会重新绘制。该程序还验证了结构总阻力；计算了钢材剖面面积，船体梁剖面模量和惯性矩；比较了计算值与规范最低要求值；并分析船舶是否满足总纵强度。随后，程序将基于船中剖面、横剖面面积和横向舱壁位置来估算钢料重量以及船的重心。最后，用户可以生成详细的报告，其中包含程序产生的所有信息以及计算存档。给出了一个应用示例。

关键词：结构初步设计，近海供应船，计算程序

目录

Abstract 2

摘要 4

1 Introduction 7

2 State of art 8

2.1 Software comparison 10

3 Rules implemented in the structural model 14

3.1 Programmed rules 16

3.1.1 Hull girder longitudinal resistance 16

3.1.2 Shell plating 16

3.1.3 Stiffeners and girders resistance 17

3.2 Manufacturers 18

4 Program description 20

4.1 Main particulars of the vessel 20

4.2 Calculation of the ABS rules and plate sizing 21

4.3 Detailing of structural elements 21

4.4 Section modulus 22

4.5 Midship section drawing 23

4.6 Steel weight 24

4.7 Case studies 27

5 Use of the program 30

5.1 Ergonomics of tabs 30

5.2 Program processing 32

5.2.1 Insert general particulars 32

5.2.2 Insert structural topology 33

5.2.3 Check bending moment and shear force curves 34

5.2.4 Insert steel particulars 35

5.2.5 Structural elements sizing 35

5.3 Main limitation of the program 37

6 Application examples 39

7 Conclusions 40

References 41

1 Introduction

This work aims to present the development of a tool capable of determining the structural topology as well as the preliminary structural design of any Offshore Supply Vessel, according to the ABS rules for this type of vessel. The program uses commercial steel pl

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