Component Lifing Decisions and Maintenance Strategies in the Context of Aeroengine Product-Service Systems Design

2015 ◽  
Author(s):  
Benjamin Thomsen ◽  
Michael Kokkolaras ◽  
Tomas Månsson ◽  
Ola Isaksson
Keyword(s):  
Low Cycle Fatigue ◽  
Systems Design ◽  
Technical Failure ◽  
Maintenance Strategies ◽  
Component Design ◽  
Product Service ◽  
Engine Components ◽  
The Impact ◽  
Product Service Systems ◽  
Repair Techniques

Static structural engine components are typically designed for full lifetime operation. Efforts to reduce weight in order to improve performance result in structural designs associated with higher lifing uncertainty: Maintaining reliability levels may necessitate expensive manufacturing and maintenance solutions. In practice, repair techniques for such structures are available; however, they are not planned for during the design process. The objective of the research presented in this paper is to model and optimize component lifecycle costs with respect to lifing decisions, demonstrated by means of an aeroengine component design example. Both technical (failure) and legislative (certification) implications are considered. The impact of maintenance strategies (repair and/or replace) on lifing design decisions is quantified. It is shown that, under different conditions, it may not be prudent to design for full life but rather accept shorter life and then repair or replace the component. This is especially evident if volumetric effects on low cycle fatigue life are taken into account. It is possible that failure rates based on legacy engines do not translate necessarily to weight-optimized components. Such an analysis can play a significant supporting role in engine component design in a product-service system context.

Quantitative Assessment of the Impact of Alternative Manufacturing Methods on Aeroengine Component Lifing Decisions

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Benjamin Thomsen ◽  
Michael Kokkolaras ◽  
Tomas Månsson ◽  
Ola Isaksson
Keyword(s):  
Net Present Value ◽  
Service System ◽  
Low Cycle Fatigue ◽  
High Reliability ◽  
Cost Model ◽  
Product Service System ◽  
Component Design ◽  
Product Service ◽  
The Impact ◽  
System Context

Static structural aeroengine components are typically designed for full lifetime operation. Under this assumption, efforts to reduce weight in order to improve the performance result in structural designs that necessitate proven yet expensive manufacturing solutions to ensure high reliability. However, rapid developments in fabrication technologies such as additive manufacturing may offer viable alternatives for manufacturing and/or repair, in which case different component lifing decisions may be preferable. The research presented in this paper proposes a value-maximizing design framework that models and optimizes component lifing decisions in an aeroengine product–service system context by considering manufacturing and maintenance alternatives. To that end, a lifecycle cost model is developed as a proxy of value creation. Component lifing decisions are made to minimize net present value of lifecycle costs. The impact of manufacturing (represented by associated intial defects) and maintenance strategies (repair and/or replace) on lifing design decisions is quantified by means of failure models whose output is an input to the lifecycle cost model. It is shown that, under different conditions, it may not be prudent to design for full life but rather accept shorter life and then repair or replace the component. This is especially evident if volumetric effects on low cycle fatigue life are taken into account. It is possible that failure rates based on legacy engines do not translate necessarily to weight-optimized components. Such an analysis can play a significant supporting role in engine component design in a product–service system context.

scholarly journals Systems Design Perspective of Healthcare Provision in Humanitarian Aid

2014 ◽  
Vol 7 (3) ◽  
Author(s):  
Ana Laura Santos ◽  
Linda S.G.L. Wauben
Keyword(s):  
Medical Equipment ◽  
Systems Design ◽  
Healthcare Provision ◽  
Emergency Relief ◽  
Systems Perspective ◽  
Product Service ◽  
And Performance ◽  
Relief Organizations ◽  
Product Service Systems

This study focuses on the role of Systems Design in addressing the challenges of healthcare provision by international emergency relief organizations in developing countries. More specifically the challenges related to the safety and performance of medical equipment that is transferred in the aftermath of a humanitarian crisis. The aim of this paper is to describe the transfer of medical equipment and its associated challenges from a systems perspective and to reflect on the value of Systems Design as an approach to humanitarian innovation, addressing the identified systemic challenges. The concepts of Human Factors and Ergonomics, and Product-Service Systems will be presented as valuable contributions to support designers in handling a larger degree of complexity throughout the design process and to support them to make informed choices regarding this particular context.

Value-Driven Modeling of Tactical and Operational Decisions in Support of Aerospace Product-Service Systems Design

2015 ◽  
Author(s):  
Cassio D. Goncalves ◽  
Michael Kokkolaras
Keyword(s):  
Quality Function Deployment ◽  
Systems Design ◽  
Service Systems ◽  
Business Strategies ◽  
Functional Requirements ◽  
Operational Decisions ◽  
Design Engineers ◽  
Design Variables ◽  
Product Service ◽  
Product Service Systems

Competitive markets and complex business-to-business environments compel manufacturers to provide innovative service offerings along with their products. This necessitates effective methodologires for developing and implementing sucessful new business strategies. This article presents an approach to model tactical and operational decisions to support the design and development of Product-Service Systems (PSSs). A combination of Quality Function Deployment and Design-to-Cost techniques is proposed as the first step of a PSS design framework that aids design engineers to determine the relations among value to customer, functional requirements, design variables and cost. The objective is to identify PSS design alternatives that deliver value to customer while respecting cost targets. An aerospace software case study is conducted to demonstrate the proposed approach.

scholarly journals Exploring product–service systems in the digital era: a socio-technical systems perspective

2020 ◽  
Vol 32 (4) ◽  
pp. 897-913 ◽  
Author(s):  
Ai Qiang Li ◽  
Nicholas Rich ◽  
Pauline Found ◽  
Maneesh Kumar ◽  
Steve Brown
Keyword(s):  
Digital Technologies ◽  
Service Systems ◽  
Content Type ◽  
Digital Era ◽  
Main Challenge ◽  
Product Service ◽  
Human Skills ◽  
Technical Systems ◽  
The Impact ◽  
Product Service Systems

PurposeIn the age of Industry 4.0, digital advancement is reshaping manufacturing models towards product–service systems (PSS). The drivers, readiness and challenges to move to a PSS model are not well understood, and the exploitation of the digital era presents the gap of this research.Design/methodology/approachThe research was conducted using semi-structured interviews in six manufacturers. Two forum debates were also conducted to supplement and validate the findings.FindingsSocial and economic motivations rather than environmental considerations were driving the change to PSS. Digital technologies could be an important driver if manufacturers reached a certain PSS maturity level. A high level of technical readiness was offset by a low level of social investments and the strategic development of human resources. Value co-creation was a main challenge though manufacturers had the advantage of digital connectivity, which indicated new human requirements; the greater the enabling power of digital technologies, the greater the need for advanced human skills.Practical implicationsHuman resource management has underpinned lean models; yet, the role of employees within PSS is underdeveloped despite the impact of staff in exploiting digitalisation and value co-creation. A “learning organisation” and socio-technical fit are required for the “diffusion of innovation” of PSS.Originality/valueThis research attempted to explore drivers, readiness and challenges for PSS from a socio-technical systems (STS) perspective. Three levels of PSS maturity with STS features were derived from the research, providing guidance for manufacturers.

scholarly journals A manufacturing framework for capability-based product-service systems design

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Annamalai Vasantha Gokula Vijaykumar ◽  
Hitoshi Komoto ◽  
Romana Hussain ◽  
Rajkumar Roy ◽  
Tetsuo Tomiyama ◽  
...  
Keyword(s):  
Systems Design ◽  
Service Systems ◽  
Product Service ◽  
Product Service Systems

scholarly journals A knowledge management framework to support product-service systems design

2009 ◽  
Vol 22 (12) ◽  
pp. 1073-1088 ◽  
Author(s):  
David Baxter ◽  
Rajkumar Roy ◽  
Athanasia Doultsinou ◽  
James Gao ◽  
Mohamad Kalta
Keyword(s):  
Knowledge Management ◽  
Systems Design ◽  
Service Systems ◽  
Management Framework ◽  
Product Service ◽  
Product Service Systems
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