PARAMETRIC FORMULATION OF THE FLOODABLE LENGTH CURVE: APPLICATION CASE TO OFFSHORE PATROL VESSELS

2021 ◽  
Vol 162 (A1) ◽  
Author(s):  
P Gualeni ◽  
G Balanzoni ◽  
V Bocola ◽  
G A Di Mare
Keyword(s):  
Design Phase ◽  
Acquisition Process ◽  
Efficient Approach ◽  
Wide Domain ◽  
Parametric Expression ◽  
Automated Processes

The residual buoyancy of vessels after damage has a fundamental role in their survivability and it is implemented through adequate ship internal subdivision. Traditionally the number and the position of transverse watertight bulkheads are selected for most ships early in the design phase by means of the “floodable length curve” coupled with the concept of “margin line”. However, for naval vessels, it is more and more common during the acquisition process to explore a wide domain of feasible ships, identified with the assistance of automated processes and assessed also in terms of capabilities, among which is survivability. The generation and the comparison of a considerable number of different ship configurations is very time consuming. Therefore recourse to a parametric expression of the floodable length curve is considered to be a very efficient approach and would thus enable characterisation of the ship, in terms of survivability performance. In this paper such an approach is presented, using an offshore patrol vessel (OPV) as the case study.

Parametric Formulation of the Floodable Length Curve: Application Case to Offshore Patrol Vessels

2020 ◽  
Vol 162 (A1) ◽  
Author(s):  
P Gualeni ◽  
G Balanzoni ◽  
V Bocola ◽  
G A Di Mare
Keyword(s):  
Design Phase ◽  
Acquisition Process ◽  
Efficient Approach ◽  
Wide Domain ◽  
Parametric Expression ◽  
Automated Processes

The residual buoyancy of vessels after damage has a fundamental role in their survivability and it is implemented through adequate ship internal subdivision. Traditionally the number and the position of transverse watertight bulkheads are selected for most ships early in the design phase by means of the “floodable length curve” coupled with the concept of “margin line”. However, for naval vessels, it is more and more common during the acquisition process to explore a wide domain of feasible ships, identified with the assistance of automated processes and assessed also in terms of capabilities, among which is survivability. The generation and the comparison of a considerable number of different ship configurations is very time consuming. Therefore recourse to a parametric expression of the floodable length curve is considered to be a very efficient approach and would thus enable characterisation of the ship, in terms of survivability performance. In this paper such an approach is presented, using an offshore patrol vessel (OPV) as the case study.

scholarly journals An Optimization Workflow in Design for Additive Manufacturing

2021 ◽  
Vol 11 (6) ◽  
pp. 2572
Author(s):  
Stefano Rosso ◽  
Federico Uriati ◽  
Luca Grigolato ◽  
Roberto Meneghello ◽  
Gianmaria Concheri ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Structural Optimization ◽  
Geometric Model ◽  
Complex Geometries ◽  
Design Phase ◽  
Design For Additive Manufacturing ◽  
Engineering Software ◽  
Embodiment Design ◽  
Pros And Cons

Additive Manufacturing (AM) brought a revolution in parts design and production. It enables the possibility to obtain objects with complex geometries and to exploit structural optimization algorithms. Nevertheless, AM is far from being a mature technology and advances are still needed from different perspectives. Among these, the literature highlights the need of improving the frameworks that describe the design process and taking full advantage of the possibilities offered by AM. This work aims to propose a workflow for AM guiding the designer during the embodiment design phase, from the engineering requirements to the production of the final part. The main aspects are the optimization of the dimensions and the topology of the parts, to take into consideration functional and manufacturing requirements, and to validate the geometric model by computer-aided engineering software. Moreover, a case study dealing with the redesign of a piston rod is presented, in which the proposed workflow is adopted. Results show the effectiveness of the workflow when applied to cases in which structural optimization could bring an advantage in the design of a part and the pros and cons of the choices made during the design phases were highlighted.

scholarly journals Qualitative analysis of Request For Information to identify design flaws in steel construction projects

2020 ◽  
Vol 12 (1) ◽  
pp. 2083-2094
Author(s):  
Mathieu Fokwa Soh ◽  
Daniel Barbeau ◽  
Sylvie Doré ◽  
Daniel Forgues
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Qualitative Content Analysis ◽  
Analysis Tool ◽  
Design Phase ◽  
Essential Step ◽  
Steel Construction ◽  
Structured Information ◽  
Design Documents

AbstractRequest for information (RFI) is a formal process used in the Architecture, Engineering and Construction industry to address design flaws that affect communication between designers and contractors. A large number of RFIs are a sign of a lack of precision or coordination in the design documents. However, RFIs produce rich, precise, and structured information. Analyzing their content can help to identify recurring problems between designers and construction teams and better tailor future projects to the working context of the contractors. This article presents a method for identifying recurring issues during the design phase of steel construction projects through the analysis of the contents of RFIs. It is original in using a qualitative content analysis tool that can analyze large quantities of RFIs rapidly. Identifying the recurrent problems of contractors will allow the establishment of rules to be taken into consideration during the design phase of future steel construction projects. A case study of 26 steel construction projects demonstrates the feasibility of this method. This case study shows that, given the same designers and construction teams, recurring problems shown in RFIs do not differ according to the scale of the projects. In this case, the main issue between designers and contractors is the lack and inadequate presentation of information related to the connection of steel components. Identifying these problems can pave the way for initiatives to improve the design phase and can be an essential step in making contractors’ knowledge available to designers early in the projects.

scholarly journals Design for and from Recycling: A Circular Ecodesign Approach to Improve the Circular Economy

2020 ◽  
Vol 12 (23) ◽  
pp. 9861
Author(s):  
Jorge Martínez Leal ◽  
Stéphane Pompidou ◽  
Carole Charbuillet ◽  
Nicolas Perry
Keyword(s):  
Product Design ◽  
End Of Life ◽  
Circular Economy ◽  
Raw Materials ◽  
Time Lag ◽  
Design Guidelines ◽  
Design Phase ◽  
Design For Recycling ◽  
Circular Design

In the context of a circular economy, one can observe that (i) recycling chains are not adapted enough to the end-of-life products they have to process and that (ii) products are not sufficiently well designed either to integrate at best their target recycling chain. Therefore, a synergy between product designers and recycling-chains stakeholders is lacking, mainly due to their weak communication and the time-lag between the product design phase and its end-of-life treatment. Many Design for Recycling approaches coexist in the literature. However, to fully develop a circular economy, Design from Recycling also has to be taken into account. Thus Re-Cycling, a complete circular design approach, is proposed. First, a design for recycling methodology linking recyclability assessment to product design guidelines is proposed. Then, a design from recycling methodology is developed to assess the convenience of using secondary raw materials in the design phase. The recyclability of a smartphone and the convenience of using recycled materials in a new cycle are both analyzed to demonstrate our proposal. The Fairphone 2® and its treatment by the WEEE French takeback scheme are used as a case study.

Framework for metaphor-based spatial configuration design: a case study of Japanese rock gardens

2019 ◽  
Vol 34 (2) ◽  
pp. 223-232
Author(s):  
Yuval Kahlon ◽  
Haruyuki Fujii
Keyword(s):  
Design Process ◽  
Spatial Configuration ◽  
Configuration Design ◽  
Design Phase ◽  
Rock Composition ◽  
Conceptual Design Phase ◽  
Spatial Configurations ◽  
Visual Potential ◽  
Alternative Designs

AbstractMetaphors are powerful tools for design, enabling designers to encapsulate sets of properties and relations as short verbal descriptions. This paper aims to clarify how simple spatial configurations may emerge from concise metaphoric descriptions at the conceptual design phase. To this aim, we propose a framework for a metaphor-based design process. As a basis for the framework, we introduce the concept of “complementary visual potential” – a property which ties the spatial configuration of the objects in the composition with their metaphoric roles. The framework is developed by studying the practice of metaphor-based spatial configuration design in Japanese rock gardens. Accordingly, it is implemented and tested in this context by attempting to generate alternative designs for an existing rock composition in the famous garden of Ryōan-ji. This is followed by a discussion of its possible implications and potential for generalization to other areas of design.

Simulation-Supported Early Stage Design Optimisation for a Case Study of Life Cycle Oriented Buildings

2019 ◽  
Vol 887 ◽  
pp. 353-360 ◽  
Author(s):  
Sören Eikemeier ◽  
Ardeshir Mahdavi ◽  
Robert Wimmer
Keyword(s):  
Life Cycle ◽  
Architectural Design ◽  
Early Stage ◽  
Preliminary Design ◽  
Design Phase ◽  
Design Optimisation ◽  
Stage Design ◽  
Simulation Based ◽  
Early Stage Design

To reduce the energy and resource consumption in the building sector this study is focusing on a design optimisation of life cycle oriented buildings. In order to optimise the performance of the buildings and in consequence also to achieve improved results for the mandatory Austrian energy certificate a simulation-based rapid design approach is used for the early stage design phase of the buildings, in particular for the architectural design of the buildings.Methods like the Window to Wall Ratio, at the very beginning of the design process, a parametric simulation with EnergyPlus or a more detailed optimisation approach with GenOpt are integrated in this study applied to example buildings. The results are showing that the method can be used in a circular approach for improving the heating demand of the Austrian energy certificate for this case study by more than 25 % compared to the preliminary design

The Application of FOOM Methodology to IFIP Conference Case Study

2003 ◽  
pp. 82-95
Author(s):  
Judith Kabeli ◽  
Peretz Shoval
Keyword(s):  
Functional Analysis ◽  
Information Systems ◽  
Object Oriented ◽  
Class Diagram ◽  
Design Phase ◽  
Complete Class ◽  
Analysis And Design ◽  
Systems Analysis And Design ◽  
Flow Diagrams

FOOM (Functional and Object-Oriented Methodology) is an integrated methodology for information systems’ analysis and design, which combines two essential software-engineering paradigms: the functional/data approach (or process-oriented) and the object-oriented (OO) approach. Having applied FOOM in a variety of domains, this chapter presents the application of the methodology to the specification of the IFIP Conference system. We focus on the analysis and design phases. FOOM-analysis phase includes data modeling and functional analysis activities and produces an initial Class Diagram and a hierarchy of OO data flow diagrams (OO-DFDs). The products of the design phase include: (a) a complete class diagram; (b) object classes for the menus, forms and reports and (c) a behavior schema, which consists of detailed descriptions of the methods and the application transactions, expressed in pseudocode and message diagrams.

scholarly journals Parametric design of a complex part in a FEM environment

2019 ◽  
Vol 299 ◽  
pp. 03005
Author(s):  
Mădălina Ioana Blaj ◽  
Gheorghe Oancea
Keyword(s):  
Parametric Design ◽  
Complex Geometry ◽  
Visual Basic ◽  
Design Phase ◽  
Advantages And Disadvantages ◽  
Complex Part ◽  
Accelerated Evolution ◽  
Programming Software ◽  
Programming Solution

In the recent years, the industry tends to an accelerated evolution in order to maintain the competitiveness on the profile market. As a response to this challenge, engineers and researchers have started to combine multidisciplinary knowledge with solutions provided by programming software so as to obtain immediate and reliable results on each step of a product development. The main advantage is highlighted especially for the optimization phases, when the using of the parametric tools is less time-consuming and the majority of issues of the developed product are solved from the first version of the project. This paper aims to present a case study of a parametric design and meshing in MSC Patran environment, using a programming solution in Visual Basic, of a part with a complex geometry from aerospaceindustry and also to accentuate the minimized risks from the design phase to manufacturing, with a review of the advantages and disadvantages.

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