Considerations for an Extended Framework for Interactive Epoch-Era Analysis

Curry, Michael L.; Ross, Adam M.

doi:10.1016/j.procs.2015.03.029

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…Tradespace Exploration (TSE) [24] is good at predictively modeling cost and performance of candidate systems at a specific point in time under a specific set of assumptions or context variables. It, however, offers no direct means to evaluate the system under examination across time, other than making abstract assumptions about future world conditions set through the means of exogenous context parameters and re-computing a utility function (when this is done, it is called Epoch-Era analysis [25]). Thus, it specifically natively lacks the ability to predictively model changes over time.…”

Section: Development Of the Methodologymentioning

confidence: 99%

An economic analysis of disaggregation of space assets: Application to GPS

Hastings

Tour

2017

Acta Astronautica

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New ideas, technologies and architectural concepts are emerging with the potential to reshape the space enterprise. One of those new architectural concepts is the idea that rather than aggregating payloads onto large very high performance buses, space architectures should be disaggregated with smaller numbers of payloads (as small as one) per bus and the space capabilities spread across a correspondingly larger number of systems. The primary rationale is increased survivability and resilience. The concept of disaggregation is examined from an acquisition cost perspective. A mixed system dynamics and trade space exploration model is developed to look at long-term trends in the space acquisition business. The model is used to examine the question of how different disaggregated GPS architectures compare in cost to the well-known current GPS architecture. A generation-over-generation examination of policy choices is made possible through the application of soft systems modeling of experience and learning effects. The assumptions that are allowed to vary are: design lives, production quantities, nonrecurring engineering and time between generations. The model shows that there is always a premium in the first generation to be paid to disaggregate the GPS payloads. However, it is

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Section: Development Of the Methodologymentioning

confidence: 99%

An economic analysis of disaggregation of space assets: Application to GPS

Hastings

Tour

2017

Acta Astronautica

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“…Different techniques have been applied across research domains to address perceptual complexity. For example, Bertoni et al (2013) used color-coded CAD models to enhance the awareness of stakeholders concerning a particular component of PSS, Curry & Ross (2015) used interactive tradespaces for visualizing complex simulation data and assisting design decision-making, He et al (2020) used parallel coordinates plots for mapping Pareto-optimal solutions and choosing a compromised solution, Toller et al (2022) used network graphs for understanding the complexities associated with linking value and data to bring consensus amongst the stakeholders regarding the importance of operational data, and so forth. Idrissov, Škec & Maier (2020) listed several such techniques and related them to the addressed feature of a system.…”

Section: Perceptual Complexitymentioning

confidence: 99%

“…On the other hand, Aziz et al (2016) considered changeable modules as a crucial part of the PSS lifecycle that enables superior customer satisfaction and longer operational life, reflecting active value robustness. However, the critical challenge in resolving temporal complexity is to involve many relevant external factors across the operational phase, understand contextual drifts and extract actionable information to support design decisions (Curry & Ross 2015; Bertoni & Bertoni 2019).…”

Section: Findings: Complexity Aspects In Design Decision-makingmentioning

confidence: 99%

Incorporating changeability for value-robust product-service systems: an integrative review

Machchhar,

Bertoni,

Wall

et al. 2024

Des. Sci.

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The ongoing servitization journey of the manufacturing industries instills a through-life perspective of value, where a combination of products and services is delivered to meet expectations. Often described as a product-service system (PSS), these systems are poised with many complexity aspects, introducing uncertainties during the design phase. Incorporating changeability is one of the known strategies to deal with such uncertainties, where the system changes in the face of uncertainty to sustain value, thereby achieving value robustness. While the theme of dealing with multiple uncertainties has been discussed since the inception of PSS, changeability is still poorly addressed. To bridge this gap, an integrative literature review is performed to outline various complexities aspects and their link to uncertainty from a PSS perspective. Also, the state-of-the-art approach to achieving value robustness is presented via changeability incorporation. Subsequently, a reference framework is proposed to guide decision-makers in changeability incorporation in PSS, especially during the early design stages.

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“…Furthermore, it also facilitates understanding underlying conflicting objectives during requirement elicitation and conceptual design [Salado and Nilchiani, 2015] and can support the planning of technology portfolios [Davison, Cameron, and Crawley, 2015]. In addition, the capabilities of tradespace exploration are being steadily evolved to incorporate for example uncertainty in the determination of the Pareto front [Mattson and Messac, 2005], change over time in the tradespace configuration and location of the Pareto front Lewis and Mattson, 2012;Curry and Ross, 2015], value robustness [Ross, Rhodes, and Hastings, 2009], or framing and visualization effects for facilitating negotiation [Fitzgerald and Ross, 2014].…”

Section: Tradespace Exploration and Pareto Frontiersmentioning

confidence: 99%

Defining Better Test Strategies with Tradespace Exploration Techniques and Pareto Fronts: Application in an Industrial Project

Salado

2015

Syst. Engin.

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Test strategies are usually defined following a point-design like method. Starting with a set of verification requirements and programmatic constraints, and usually with a generic test sequence, a baseline test approach is defined. Then, the baseline is optimized until an acceptable strategy is found. Academia has consistently shown however the benefits of using tradespace exploration techniques instead of pointbased designs. Some industrial applications seem to corroborate such findings. Yet, both academia and industry have limited the use of tradespace exploration techniques to selecting design concepts. This paper proposes that broadening the use of tradespace exploration techniques and Pareto frontiers to other activities in the field of systems engineering domain yields similar benefits. In particular, this paper presents the actual application of tradespace exploration techniques and Pareto frontiers in an industrial context to select a test strategy for a system. This paper provides thus three main contributions. First, the paper demonstrates that tradespace exploration and Pareto frontiers can be beneficial beyond concept selection. Second, the paper presents a process to use tradespace exploration techniques and Pareto frontiers for selecting test strategies. Finally, the paper showcases the application of the proposed technique and process in a real industrial setup, which yielded a number of lessons learnt. C⃝ 2016 Wiley Periodicals, Inc. Syst Eng 18: 639-658, 2015

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Considerations for an Extended Framework for Interactive Epoch-Era Analysis

Cited by 12 publications

References 14 publications

An economic analysis of disaggregation of space assets: Application to GPS

An economic analysis of disaggregation of space assets: Application to GPS

Incorporating changeability for value-robust product-service systems: an integrative review

Defining Better Test Strategies with Tradespace Exploration Techniques and Pareto Fronts: Application in an Industrial Project

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