Optimization of Design Margins Allocation When Making Use of Additive Remanufacturing

2021 ◽  
pp. 1-18
Author(s):  
Khalil Alhandawi ◽  
Massimo Panarotto ◽  
Petter Andersson ◽  
Ola Isaksson ◽  
Michael Kokkolaras
Keyword(s):  
Cost Effective ◽  
Problem Formulation ◽  
Optimization Method ◽  
Structure Design ◽  
Design Decisions ◽  
Robust Designs ◽  
Effective Manner ◽  
Different Types ◽  
Temperature Loads

Abstract Coping with changing requirements by means of introducing design margins may result in overdesign. In this paper, we present a design optimization method for minimizing overdesign by exploiting additive remanufacturing. Our problem formulation makes use of recently defined constituents of design margins: buffer and excess. The proposed method can be used to obtain a set of design decisions for different changing requirement scenarios. We demonstrate it using a turbine rear structure design problem where changes in the temperature loads are met by depositing different types of stiffeners on the outer casing. The results of the case study are visualized in a tradespace, which allows for comparison between sets of optimal, flexible, and robust designs. Results show that the optimized set of design decisions balances flexibility and robustness in a cost-effective manner.

Optimal Allocation of Design Margins in Additive Remanufacturing

2021 ◽  
Author(s):  
Khalil Al Handawi ◽  
Massimo Panarotto ◽  
Petter Andersson ◽  
Ola Isaksson ◽  
Michael Kokkolaras
Keyword(s):  
Additive Manufacturing ◽  
Design Optimization ◽  
Optimization Problem ◽  
Optimal Allocation ◽  
Optimization Method ◽  
Structure Design ◽  
Design Decisions ◽  
Optimal Decisions ◽  
Different Types ◽  
Temperature Loads

Abstract Often, coping with changing requirements results in substantial overdesign, because of the ways in which design margins are allocated at the beginning of the design process. In this paper, we present a design optimization method for minimizing overdesign using additive manufacturing. We use recently defined constituents of design margins (buffer and excess) as metrics in a design optimization problem to minimize overdesign. The method can be used to obtain optimal design decisions for changing requirements. We demonstrate our method by means of a turbine rear structure design problem where changes in the temperature loads are met by depositing different types of stiffeners on the outer casing. The optimal decisions obtained by optimization minimize overdesign but ensure that requirements are met throughout the product’s lifecycle.

scholarly journals Coordination mechanisms in the store opening process

2014 ◽  
Vol 42 (6) ◽  
pp. 482-499 ◽  
Author(s):  
Erik Sandberg
Keyword(s):  
Coordination Mechanisms ◽  
Content Type ◽  
Organic Growth ◽  
Effective Manner ◽  
Different Types ◽  
Multiple Case ◽  
Research Questions ◽  
A Company ◽  
Opening Process

Purpose – For many retailers organic growth through the opening of new stores is a crucial cornerstone of the business model. The purpose of this paper is to explore the store opening process conducted by retail companies. The research questions cover: first, the role and organisation of the establishment function in charge of the process; second, the activities and functions involved in the process; and third, the coordination mechanisms applied during the process. Design/methodology/approach – This research considers the store opening process as a company-wide project, managed by an establishment function, in which internal functions as well as external suppliers need to be coordinated. A multiple case study of eight retail companies is presented, focusing on the organisation of the establishment function, a mapping of the store opening process and the application of coordination mechanisms. Findings – The role and organisation of the establishment function is described and the store opening process is summarised into 11 main activities to be conducted by either the establishment function or other involved functions. During the store opening process six different coordination mechanisms are utilised, including mutual adjustments and direct supervision, as well as different types of standardisation. Originality/value – This research seeks to improve our understanding for the store opening process and how it can be managed and controlled in an effective manner.

scholarly journals The implementation of Cost-Effective in Spanish local governments: Analysis of institutional work in a case study

2020 ◽  
Vol 23 (1) ◽  
pp. 75-90
Author(s):  
José María González-González ◽  
Manuel Jesús García-Fénix
Keyword(s):  
Local Government ◽  
Local Governments ◽  
Public Management ◽  
Central Government ◽  
Theoretical Perspective ◽  
Cost Effective ◽  
Longitudinal Case Study ◽  
Institutional Work ◽  
Different Types

Este trabajo se propone analizar las formas de trabajo institucional desarrolladas por distintos actores para la emergencia e implantación del Coste Efectivo de los Servicios de las Entidades Locales (CESEL). Los resultados del estudio de caso longitudinal realizado ponen de manifiesto que los principales actores, Gobierno Central y Ayuntamiento, llevaron a cabo diferentes formas de trabajo institucional (político, cultural y técnico), surgiendo conflictos durante su desarrollo debido a las distintas lógicas institucionales en las que se apoyaron: eficiencia económica e interés social, respectivamente. Este trabajo contribuye a la perspectiva teórica adoptada evidenciando que las formas en las que se desarrolla el trabajo institucional por distintos actores determinan la configuración final de la nueva institución que quiere crearse. Así, aunque la regulación estableció como finalidad del CESEL profundizar en el cumplimiento de los principios de eficiencia y de transparencia de la gestión pública local, las formas en las que se ha desarrollado el trabajo institucional durante su implantación lo han configurado como un instrumento de transparencia, presentando además serias limitaciones para que ésta sea efectiva. This paper aims to analyze the forms of institutional work carried out by different actors with regard to the emergence and implementation of Cost-Effective of Local Government Services (CESEL, Coste Efectivo de los Servicios de las Entidades Locales). The results of the longitudinal case study evidence that the main actors, Central Government and Local Government, carried out different types of institutional work (political, cultural and technical), by arising conflicts during their development due to the different institutional logics in which they were supported: economic efficiency and social interest, respectively. This work contributes to the theoretical perspective adopted by evidencing that the ways in which institutional work is developed by different actors determine the final configuration of the new institution that is to be created. Thus, although the regulation established that the purpose of CESEL is to deepen on compliance with the principles of efficiency and transparency of local public management, the ways in which the institutional work has been developed during its implementation have configured it as an instrument for transparency and also it presents serious limitations so that transparency is effective.

scholarly journals PROPOSING A MULTI-CRITERIA PATH OPTIMIZATION METHOD IN ORDER TO PROVIDE A UBIQUITOUS PEDESTRIAN WAYFINDING SERVICE

2015 ◽  
Vol XL-1-W5 ◽  
pp. 639-644 ◽  
Author(s):  
M. Sahelgozin ◽  
A. Sadeghi-Niaraki ◽  
S. Dareshiri
Keyword(s):  
Mathematical Model ◽  
Mobile Devices ◽  
Environmental Conditions ◽  
Context Awareness ◽  
Optimization Method ◽  
Path Optimization ◽  
Navigation Systems ◽  
Different Types ◽  
Novel Applications

A myriad of novel applications have emerged nowadays for different types of navigation systems. One of their most frequent applications is <i>Wayfinding</i>. Since there are significant differences between the nature of the pedestrian wayfinding problems and of those of the vehicles, navigation services which are designed for vehicles are not appropriate for pedestrian wayfinding purposes. In addition, diversity in environmental conditions of the users and in their preferences affects the process of pedestrian wayfinding with mobile devices. Therefore, a method is necessary that performs an intelligent pedestrian routing with regard to this diversity. This intelligence can be achieved by the help of a <i>Ubiquitous</i> service that is adapted to the <i>Contexts</i>. Such a service possesses both the <i>Context-Awareness</i> and the <i>User-Awareness</i> capabilities. These capabilities are the main features of the ubiquitous services that make them flexible in response to any user in any situation. In this paper, it is attempted to propose a multi-criteria path optimization method that provides a Ubiquitous Pedestrian Way Finding Service (UPWFS). The proposed method considers four criteria that are summarized in <i>Length, Safety, Difficulty</i> and <i>Attraction</i> of the path. A conceptual framework is proposed to show the influencing factors that have effects on the criteria. Then, a mathematical model is developed on which the proposed path optimization method is based. Finally, data of a local district in Tehran is chosen as the case study in order to evaluate performance of the proposed method in real situations. Results of the study shows that the proposed method was successful to understand effects of the contexts in the wayfinding procedure. This demonstrates efficiency of the proposed method in providing a ubiquitous pedestrian wayfinding service.

Lattice Structure Design for Additive Manufacturing: Unit Cell Topology Optimization

2019 ◽  
Author(s):  
Bradley Hanks ◽  
Mary Frecker
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Lattice Structure ◽  
Optimization Method ◽  
Structure Design ◽  
Unit Cell ◽  
Lattice Structures ◽  
Design For Additive Manufacturing ◽  
Structure Topology

Abstract Additive manufacturing is a developing technology that enhances design freedom at multiple length scales, from the macroscale, or bulk geometry, to the mesoscale, such as lattice structures, and even down to tailored microstructure. At the mesoscale, lattice structures are often used to replace solid sections of material and are typically patterned after generic topologies. The mechanical properties and performance of generic unit cell topologies are being explored by many researchers but there is a lack of development of custom lattice structures, optimized for their application, with considerations for design for additive manufacturing. This work proposes a ground structure topology optimization method for systematic unit cell optimization. Two case studies are presented to demonstrate the approach. Case Study 1 results in a range of unit cell designs that transition from maximum thermal conductivity to minimization of compliance. Case Study 2 shows the opportunity for constitutive matching of the bulk lattice properties to a target constitutive matrix. Future work will include validation of unit cell modeling, testing of optimized solutions, and further development of the approach through expansion to 3D and refinement of objective, penalty, and constraint functions.

Problem Discovery With Many-Objective Visual Analytics

2016 ◽  
Author(s):  
Matthew Woodruff ◽  
Timothy W. Simpson
Keyword(s):  
Visual Analytics ◽  
Design Problem ◽  
Problem Formulation ◽  
Design Problems ◽  
Design Decisions ◽  
Detailed Design ◽  
Default State ◽  
State Of Affairs

Problem discovery is messy. It involves many mistakes, which may be regarded as a failure to address a design problem correctly. Mistakes, however, are inevitable, and misunderstanding the problems we are working on is the natural, default state of affairs. Only through engaging in a series of mistakes can we learn important things about our design problems. This study provides a case study in Many-Objective Visual Analytics (MOVA), as applied to the problem of problem discovery. It demonstrates the process of continually correcting and improving a problem formulation while visualizing its optimization results. This process produces a new, clearer understanding of the problem and puts the designer in a position to proceed with more-detailed design decisions.

scholarly journals The Future as a Design Problem

Design Issues ◽  
2016 ◽  
Vol 32 (3) ◽  
pp. 6-17 ◽  
Author(s):  
Stuart Reeves ◽  
Murray Goulden ◽  
Robert Dingwall
Keyword(s):  
Structure Design ◽  
Design Practice ◽  
Design Decisions ◽  
Social Legitimacy ◽  
The Past ◽  
The Social ◽  
The Future ◽  
Grand Vision ◽  
Foundational Problem

An often unacknowledged yet foundational problem for design is how ‘futures‘ are recruited for design practice. This problem saturates considerations of what could or should be designed. We distinguish two intertwined approaches to this: ‘pragmatic projection’, which tries to tie the future to the past, and ‘grand vision’, which ties the present to the future. We examine ubiquitous computing as a case study of how pragmatic projection and grand vision are practically expressed to direct and structure design decisions. We assess their implications and conclude by arguing that the social legitimacy of design futures should be increasingly integral to their construction.

Steel Lazy Wave Riser Configuration for Turret Moored FPSO With Disconnectable Turret in Deepwater

2015 ◽  
Author(s):  
Daniel Karunakaran ◽  
Sankar Subramanian ◽  
Rolf Baarholm
Keyword(s):  
Deep Water ◽  
Cost Effective ◽  
Attractive Alternative ◽  
Harsh Environment ◽  
Detailed Case ◽  
Effective Manner ◽  
Water Developments ◽  
Pros And Cons ◽  
Steel Catenary Risers

Recently turret-Moored FPSOs have been used in many deep water developments worldwide, with consideration of disconnectable turrets for harsh environment applications. This trend makes the interactions between FPSO and risers system more important. Further, Steel Lazy Wave Risers (SLWR), which is a compliant variant of the mostly commonly used Steel Catenary Risers (SCR), is becoming an attractive riser option. The paper provides a review of the various riser systems that can be considered for turret-moored FPSOs, and specific emphasis on Steel Lazy Wave Risers. A detailed case study of Steel Lazy Wave Risers for a typical turret moored FPSO with disconnectable turret is presented. This system is described in terms of design and functionalities, the fabrication and installation methods are presented. The case study shows clearly that SLWR are an attractive alternative to be used for FPSO with disconnectable turret and is very efficient to fabricate and install in a very cost effective manner. Pros and Cons for SLWR are discussed, with consideration of the particular challenges of turret-moored FPSOs with large floater motions, hang-off geometry constraints at turret, hang-off loads, riser interferences, risers pre-installation, and turret disconnection constraints.

scholarly journals Assessment of Organizational Agility in Software Projects

Webology ◽  
2021 ◽  
Vol 18 (Special Issue 01) ◽  
pp. 149-163
Author(s):  
Prabha Masilamani ◽  
M. Suresh
Keyword(s):  
Cost Effective ◽  
Software Project ◽  
Organizational Agility ◽  
Software Projects ◽  
Project Organization ◽  
Business Agility ◽  
Effective Manner ◽  
Current Context ◽  
Case Organization

In the current context of business, agility refers to the dynamic capability of an organization to adapt itself to market and industry demands in a productive and cost-effective manner. Organizational Agility focuses on both stability and dynamism, is more people centric in its approach towards efficient output through faster decision cycles and leveraging technology to manage risks and produce the desired output for its customers. This paper aims at evaluating the organizational agility level from the perspective of people and culture in a software project organization using the multi-grade fuzzy approach. Findings from the case study indicate that the case organization agility index is 6.79 which specifies as ‘agile’. Importance Performance Analysis is used to identify the weaker attributes of case organization. Furthermore, recommendations for the improvisation of weaker attributes of the case organization are discussed.

Design and Optimization of Core Assembly Line for Turbo Charger

2016 ◽  
Vol 852 ◽  
pp. 852-858
Author(s):  
Sa. Paveethrun ◽  
R. Bakthavachalam ◽  
S. Kannan
Keyword(s):  
Assembly Line ◽  
Operation Time ◽  
Cost Effective ◽  
Labor Cost ◽  
Design And Optimization ◽  
Effective Manner ◽  
Turbo Charger ◽  
Operational Improvement ◽  
Dual Arm Robot

This study investigates ‘Manufacturing design for productivity’ surveying a case study of an existing assembly line for Turbo charger Core. The main aim is to investigate the possibilities of operational improvement by reducing number of stations in assembly line in a cost-effective manner by reducing the number of grippers used in complete assembly layout. An assembly line is selected for the case study. An existing assembly is redesigned by using the concepts of methods engineering. Then both cases are analyzed and discussed in terms of their output ability and manufacturing time. After the analysis of redesigned assembly layout it is observed that we can reduce average Operation time by 15 % at the end of this study. At the end of this project, we increased the production quantity from 824 to 955 products. Because efficiency of station work has increased with the redesigned assembly line with aid of dual arm robot. The new assembly line reduces the station idle time and increases its efficiency in operation. The existing assembly line was covering 8 m2 it got reduced to 4 m2 approximately in optimized layout. It is observed 15.89% productivity increased for the same period of time. By the standardization and the elimination of the station operations, and reducing the labor cost the company could increase its competitive strength through the optimized layout design.

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