An Aerospace Requirements Setting Model to Improve System Design

Centrich, X. Tomas; Shehab, Essam; Sydor, Piotr; Mackley, Tim; John, Philip; Harrison, Andrew J.

doi:10.1016/j.procir.2014.07.127

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Fourteen different case studies were identified in the literature review (Agostinho et al, 2014, Büyüközkan and Berkol, 2011, Centrich et al, 2014, Crowder et al, 2012, Geng et al, 2011, Harrington and Srai, 2012, Kim et al, 2011, Maussang et al, 2009, McKay and Kundu, 2015, Peruzzini et al, 2014, Song et al, 2013, Trappey et al, 2011, Vezzoli and Sciama, 2006, Wong et al, 2008. The type of sector each case was applied in and some additional details can be found in Paper 1 (Nilsson and Lindahl, 2016).…”

Section: Verification Of Newly Developed Toolsmentioning

confidence: 99%

How requirements development could support design of effective and resource-efficient offerings

Nilsson¹

2017

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What a company offers its customers has to fulfil several different needs, desires, constraints, which can originate from multiple different sources that affect the offering throughout its life cycle. All these criteria have to come together and be translated into statements that can support the designer's understanding of the offering's purpose. This translation is done through a requirements development process to provide a controlled process to define statements that describe what the offering is supposed to fulfil.This research provides insights on key challenges and success factors in requirements development to support the design of effective and resource-efficient offerings. Namely, it identifies crucial sources and aspects to be considered, and a requirements development process demonstrating how to overcome identified challenges. By getting the requirements right from the beginning, sub-optimisation and unnecessary time and risks can be avoided.The consideration of accurate sources and aspects is considered to be one of the most important factors for the successful design of offerings. It is also in the earliest phases of design, that is to say requirements development, where one has the greatest possibility to affect the environmental impact of the offering. What is missing, however, is sufficient and appropriate support in industry on how to do so. VIII IX APPENDED PAPERSThe following papers were written during the research and set the foundation for this thesis: Contributions in the papers:Paper 1: The author of this thesis solely carried out this review (Systematic Literature Review 1), and the paper was to about 95% written by her. The co-author supported in the research process and supported with background knowledge in the area, framing and scope.Paper 2: This paper was prepared in collaboration between the authors, from idea to submission. Each author contributed with cases as well as knowledge from their own expertise. The author of this thesis contributed specifically with the idea to focus on SMEs, and also added the sustainability aspects of providing integrated offerings. The author of this thesis also contributed with one of the use cases (that originated from Interview Study 1), and wrote about 30% of the text in the paper. Paper 3:The literature review and the company cases were based on results from Systematic Literature Review 2 and Interview Study 1. The author of this thesis wrote the main draft of the manuscript. Co-authors supported the work along its process, and especially with rewriting and reworking when revising the paper after the first submission.

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Section: Verification Of Newly Developed Toolsmentioning

confidence: 99%

How requirements development could support design of effective and resource-efficient offerings

Nilsson¹

2017

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“…Although, it is specified in this work [4] that typical fastener loading occurs through either static overloadin tension, bend or shearor dynamic fatigue caused by cyclical loading conditions, or corrosion. Additional consideration must be given to in-service expected operating temperatures and conditions, for sensible material selection [5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Ti-6Al-4V Bar for Aerospace Fastener Pin Axial Forging

Turner,

Smith,

Zneimer

et al. 2024

Mater. Plus

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Ti-6Al-4V warm forged fasteners are a critical part of the aerospace industry, as they are used in vast quantities for mechanical joining of components for the fuselage, wing-skin and aero-engine. These components are produced in vast quantities at rapid production rates through multi-blow axial forging However the rate that they are manufactured means that manufacturers rely upon periodic part conformance testing to understand if the part is within tolerance or if any undesirable manufacturing defects such as cracks or underfilling are present. Thus, a right-first-time manufacturing approach is essential to minimize non-conformant scrap. An analysis of the Ti-6Al-4V supplied raw material for axial forging, in a variety of different bar diameter sizes and from different industrial suppliers, was conducted. This was to attempt to understand whether material property variation or operator variation was the root cause for some material behaving differently during the manufacture route. Experimental testing was performed through microstructure characterization and mechanical testing methods. The volume fraction of the β-phase was noted to be marginally higher in material with good forgeability. The hardness of the inner core of the bar appears to be a critical material property for the Ti-6Al4V bar, with an overly hard bar-core hindering forgeability of the bar. This is believed to be due to the hotter central region malleability being key for forgeability. Micro-void porosity was also noted which could lead to stress concentration locations, or crack initiation, and as such is a deleterious property for forgeability. The experienced forgeability of the Ti-6Al-4V bars have been demonstrated to be sensitive to rather small variation in measured microstructure and mechanical property. It is believed that cumulative impacts of small differences, 1% variation in α-phase volume fraction, small variations in elongation to failure, 1% variation in elastic modulus and microhardness profile variation at the center of the bar of less than 10 HV0.3, can combine to significantly impact the forgeability of Ti-6Al-4V bar.

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“…For these reasons, FBGs find their application in various sectors, for example, automotive, civil engineering, and aerospace [3]. The broad temperature range in aerospace environments is specifically challenging for sensor development, as they can range from −55°C externally over 600°C near the brakes and over 1500°C in the engines [4,5]. Depending on the grating type, the FBGs can withstand temperatures up to and over 1000°C.…”

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confidence: 99%

Thermal approach to classifying sequentially written fiber Bragg gratings

et al. 2019

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We demonstrate thermal classification of sequentially written fiber Bragg gratings. This Letter presents a process to determine the type of fiber Bragg grating written in SMF28 and GF4A by introducing the gratings to thermal treatment. This technique can be applied to several approaches based on sequential writing, including the small spot direct ultraviolet writing technique. Four different types of gratings have been identified, which are dependent on the fiber type and fluence used during the writing process.

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An Aerospace Requirements Setting Model to Improve System Design

Cited by 8 publications

References 4 publications

How requirements development could support design of effective and resource-efficient offerings

How requirements development could support design of effective and resource-efficient offerings

Characterization of Ti-6Al-4V Bar for Aerospace Fastener Pin Axial Forging

Thermal approach to classifying sequentially written fiber Bragg gratings

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