Guest editorial: Life-cycle of structural systems: design, assessment, maintenance and management

2018 ◽  
pp. 1-1
Author(s):  
Hitoshi Furuta ◽  
Mitsuyoshi Akiyama
Author(s):  
Brian Chell ◽  
Steven Hoffenson ◽  
Benjamin Kruse ◽  
Mark R. Blackburn

Abstract Mission engineering is a growing field with many practical opportunities and challenges. The goal of mission engineering is to increase system effectiveness, reduce life cycle costs, and aid in communicating system capabilities to key stakeholders. Optimizing system designs for their mission context is important to achieving these goals. However, system optimization is generally done using multiple key performance indicators (KPIs), which are not always directly representative of, nor easily translatable to, mission success. This paper introduces, motivates, and proposes a new approach for performing mission-level optimization (MLO), where the objective is to design systems that maximize the probability of mission success over the system life cycle. This builds on previous literature related to mission engineering, modeling, and analysis, as well as optimization under uncertainty. MLO problems are unique in their high levels of design, operational, and environmental uncertainty, as well as the single binary objective representing mission success or failure. By optimizing for mission success, designers can account for large numbers of KPIs and external factors when determining the best possible system design.


Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4311
Author(s):  
J.F. Luna-Tintos ◽  
Carlos Cobreros ◽  
Álvaro López-Escamilla ◽  
Rafael Herrera-Limones ◽  
Miguel Torres-García

The construction industry is responsible for a high percentage of the energy consumed on the planet and the emission of greenhouse gases, therefore it is considered necessary to rethink many of the processes that this industry carries out in order to reduce its environmental impact. For this, one of the paths could take into account the Life Cycle Assessment of the used materials, for which it is necessary to evaluate this aspect through indicators that allow the qualification and quantification of the weight of these environmental impacts. In this context, this article presents a methodological proposal for the quantitative evaluation of the embodied primary energy and CO2 production at each stage of the life cycle of prefabricated structural systems, taking as case studies eight prototypes from the “Solar Decathlon” competition in its editions of Europe (2014), United States (2015) and Latin America (2015), through a Simplified Life Cycle Analysis, using the Eco Audit tool from CES Edupack. Through this analysis, conclusions are drawn about the optimization of a structural system with lower environmental demand and the possibilities of transferring knowledge from this competition to be applied in innovative systems of new housing models.


Author(s):  
JORGE MENDOZA ◽  
JOCHEN KÖHLER ◽  
ELIZABETH BISMUT ◽  
DANIEL STRAUB

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