scholarly journals NEW DESIGN FOR INSTALLATION (DFI) METHODOLOGY FOR LARGE SIZE AND LONG LIFE CYCLE PRODUCTS: APPLICATION TO AN ELEVATOR

2021 ◽  
Vol 1 ◽  
pp. 2237-2246
Author(s):  
Iban Retolaza ◽  
Izaro Zulaika ◽  
Adrian Remirez ◽  
Mario Javier Cabello ◽  
Mikel Alberto Campos ◽  
...  
Keyword(s):  
Life Cycle ◽  
Design Methodology ◽  
Real Case ◽  
Assembly Process ◽  
New Approach ◽  
Potential Reduction ◽  
Large Size ◽  
Long Life ◽  
Machine Room

AbstractThis paper presents a new design methodology for improving the installation of large size and long life cycle goods that need to be assembled in the field. The approach integrates a modified design for assembly (DfA) methodology. A new approach is proposed for integrating different DfA methodologies and tested in a real case study of a machine room-less (MRL) elevator. A tool for analyzing and quantifying the proposed solutions is developed. Improvements of approximately 20 pp are achieved during the elevator installation and on-site assembly process, which could mean a potential reduction in assembly time of 11 h or 6%. Additional extensions and guidelines are recommended to improve the methodology and the tool.

Identification of asset life cycle stage: case study in heavy-duty truck fleet

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oscar Daniel Rivera Baena ◽  
Maria Valentina Clavijo Mesa ◽  
Carmen Elena Patino Rodriguez ◽  
Fernando Jesus Guevara Carazas
Keyword(s):  
Life Cycle ◽  
Design Methodology ◽  
Life Cycle Stage ◽  
Waste Collection ◽  
Content Type ◽  
Heavy Duty Truck ◽  
Maintenance Work ◽  
Operational Decision Making ◽  
The Moment

PurposeThis paper aims to determine the stage of the life cycle where the trucks of a waste collection fleet from a Colombian city are located through a reliability approach. The reliability analysis and the evaluation of curve of operational costs allow to know the moment in which it is necessary to make decisions regarding an asset, its maintenance or possible replacement.Design/methodology/approachFor a dataset presented as maintenance work orders, the time to failures (TTFs) for each vehicle in the fleet were calculated. Then, a probability density function for those TTFs was fitted to locate each vehicle in a region of the bathtub curve and to calculate the reliability of the whole fleet. A general functional analysis was also developed to understand the function of the vehicles.FindingsIt was possible to determine that the largest proportion of the fleet was in the final stage of the life cycle, in this sense, the entire fleet represent critical assets which in most of cases could be worth replacement or overhaul.Originality/valueIn this study, an address is exposed for the identification of critical equipment by reliability and statistical analysis. This analysis is also integrated with the maintenance management process. This is a broadly interested topic since it allows to support the maintenance and operational decision-making process, indicating the focus of resource allocation all over the entire asset life cycle.

scholarly journals DEVELOPMENT OF A NEW DESIGN METHODOLOGY FOR LARGE SIZE PRODUCTS BASED ON DSM AND DFMA

2020 ◽  
Vol 1 ◽  
pp. 2315-2324
Author(s):  
B. Mora ◽  
I. Retolaza ◽  
M. A. Campos ◽  
A. Remirez ◽  
M. J. Cabello ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Design Methodology ◽  
Design For Manufacturing ◽  
Design Structure Matrix ◽  
Structure Matrix ◽  
Large Size ◽  
Design Structure ◽  
Long Life

AbstractA new design methodology for long life and large size (Ll-Ls) products called Design for Installation (DfI) is proposed. Ll-Ls products are usually made up of large parts that need to be assembled on field. The proposed methodology, based on adapted Design Structure Matrix (DSM) and Design for Manufacturing and Assembly (DfMA) methods, enables to optimize the design of a Ll-Ls product in order to reduce time and cost of the installation process. The new methodology works with a conceptual design of the product and the weight and size restrictions given by logistic factors as inputs.

Optimizing Part Sourcing Strategies for Low-Volume, Long Life Cycle Products Using Second Sourcing and Part Hoarding

2013 ◽  
Author(s):  
Varun J. Prabhakar ◽  
Hannah Allison ◽  
Peter Sandborn ◽  
Bo Eriksson
Keyword(s):  
Supply Chain ◽  
Life Cycle ◽  
Mitigation Strategies ◽  
Supply Chain Disruptions ◽  
Sourcing Strategies ◽  
Study Results ◽  
Future Time Period ◽  
Long Life ◽  
The Impact

Long life cycle products, commonly found in aviation, medical and critical infrastructure applications, are often fielded and supported for long periods of time (20 years or more). The manufacture and support of long life cycle products rely on the availability of suitable parts, which over long periods of time, leaves the parts susceptible to supply chain disruptions such as suppliers exiting the market, allocation issues, counterfeit part risks, and part obsolescence. Proactive mitigation strategies exist that can reduce the impact of supply chain disruptions. One solution to mitigating the supply chain risk is the strategic formulation of part sourcing strategies (optimally selecting one or more suppliers from which to purchase parts over the life of the part’s use within a product or organization). Strategic sourcing offers a way of avoiding the risk of part unavailability (and its associated penalties), but at the expense of qualification and support costs for multiple suppliers. An alternative disruption mitigation strategy is hoarding. Hoarding involves stocking enough parts in inventory to satisfy the forecasted part demand (for both manufacturing and maintenance requirements) of a fixed future time period. This excess inventory provides a buffer that reduces the effect of supply chain disruptions on the part total cost of ownership (TCO), but increases the total holding cost. This paper presents a method of performing tradeoff analyses and identifying the optimal combination of second sourcing and hoarding for a specific part and product scenario. A case study was performed to examine the effects of hoarding on both single and second sourced parts. The case study results show that hoarding can contribute to a decrease in the cumulative TCO and a decrease in its variance.

A life-cycle approach for multi-objective optimisation in building design: methodology and application to a case study

2018 ◽  
Vol 35 (1-4) ◽  
pp. 158-179
Author(s):  
Emanuele Bonamente ◽  
Cristina Brunelli ◽  
Francesco Castellani ◽  
Alberto Garinei ◽  
Lorenzo Biondi ◽  
...  
Keyword(s):  
Life Cycle ◽  
Design Methodology ◽  
Building Design ◽  
Life Cycle Approach ◽  
Multi Objective

scholarly journals Setting Thresholds to Define Indifferences and Preferences in PROMETHEE for Life Cycle Sustainability Assessment of European Hydrogen Production

2021 ◽  
Vol 13 (13) ◽  
pp. 7009
Author(s):  
Christina Wulf ◽  
Petra Zapp ◽  
Andrea Schreiber ◽  
Wilhelm Kuckshinrichs
Keyword(s):  
Life Cycle ◽  
Hydrogen Production ◽  
Sustainability Assessment ◽  
Preference Ranking ◽  
Life Cycle Sustainability Assessment ◽  
New Approach ◽  
Outranking Methods ◽  
Proven Method ◽  
Clear Solution

The Life Cycle Sustainability Assessment (LCSA) is a proven method for sustainability assessment. However, the interpretation phase of an LCSA is challenging because many different single results are obtained. Additionally, performing a Multi-Criteria Decision Analysis (MCDA) is one way—not only for LCSA—to gain clarity about how to interpret the results. One common form of MCDAs are outranking methods. For these type of methods it becomes of utmost importance to clarify when results become preferable. Thus, thresholds are commonly used to prevent decisions based on results that are actually indifferent between the analyzed options. In this paper, a new approach is presented to identify and quantify such thresholds for Preference Ranking Organization METHod for Enrichment Evaluation (PROMETHEE) based on uncertainty of Life Cycle Impact Assessment (LCIA) methods. Common thresholds and this new approach are discussed using a case study on finding a preferred location for sustainable industrial hydrogen production, comparing three locations in European countries. The single LCSA results indicated different preferences for the environmental, economic and social assessment. The application of PROMETHEE helped to find a clear solution. The comparison of the newly-specified thresholds based on LCIA uncertainty with default thresholds provided important insights of how to interpret the LCSA results regarding industrial hydrogen production.

scholarly journals La recualificación a través del decrecimiento. Bilbao ante el urbanismo circular

2018 ◽  
pp. 169
Author(s):  
Gorka Cubes San Salvador del Valle
Keyword(s):  
Land Use ◽  
Life Cycle ◽  
Circular Economy ◽  
Urban Regeneration ◽  
Parallel Process ◽  
Urban Transformation ◽  
Real Case ◽  
New Approach ◽  
New Model ◽  
The City

El modelo expansivo imperante, no funciona cuando se enfrenta a la necesaria regeneración urbana. Mientras la ciudad siga clasificando nuevo suelo virgen donde centrar su crecimiento, se limita la oportunidad para que la ciudad pueda iniciar el proceso de regeneración de una forma endógena. Es necesario un cambio sistémico. El presente artículo reflexiona sobre un nuevo modelo, que no sólo limita el crecimiento, sino que sugiere un decrecimiento programado, como método para catalizar los procesos de regeneración urbana. El decrecimiento como fenómeno en sí mismo resiliente, que de acuerdo con el paradigma de la economía circular, pueda entender el desperdicio como alimento de un nuevo proceso paralelo. Si aceptamos el principio de que la basura es comida, tal y como apuntaron en 2002 Michael Braungart y William McDonough; entonces el decrecimiento genera valor. Este nuevo enfoque es el primer paso hacia el urbanismo circular, nuevo concepto acuñado en el presente artículo, entendido como el cierre del ciclo de vida en el uso del suelo. La investigación se adentra en la búsqueda de una aproximación a la verificación de la hipótesis, a través de un caso real de estudio: Bilbao y su próximo paso de transformación urbana.AbstractThe current expansive model does not work when faces with the needed urban regeneration. As long as the city continues to offer new soil, the opportunity so that the city can initiate the process of urban regeneration in an endogenous way is limited. A systemic shift is necessary. This article reflects on a new model, which not only limits growth, but also suggests a programmed decrease, as a method to catalyze the processes of urban regeneration. Degrowth as a resilient phenomenon itself, which, according to the circular economy paradigm, can understand waste as food for a new parallel process. If we accept the principle that garbage is food, as in 2002 by Michael Braungart and William McDonough pointed out; then the decrease generates value. This new approach is the first step towards circular urbanism, a new concept coined in this article, understood as the closure of the life cycle in land use. The investigation goes into the search of an approach to the verification of this hypothesis, through a real case of study: Bilbao and its next step of urban transformation.

LONG LIFE CYCLES IN INSECTS

1992 ◽  
Vol 124 (1) ◽  
pp. 167-187 ◽  
Author(s):  
H.V. Danks
Keyword(s):  
Community Structure ◽  
Life Cycle ◽  
Natural Enemies ◽  
Slow Growth ◽  
Life Cycles ◽  
Insect Species ◽  
Quality Food ◽  
Large Size ◽  
Long Life ◽  
Prolonged Dormancy

AbstractSeveral insect species have life cycles that last more than 1 year, because of very slow growth, repeated or prolonged dormancies, or very long lived adults. These long life cycles are correlated with environmental adversities, such as cold or unpredictable temperatures, patchy, unreliable or low quality food supplies, and natural enemies, as well as with some other properties such as large size. Long life cycles are most prevalent when several of these factors are present simultaneously. Adversities tend to prolong the life cycle of all individuals in the population, whereas unpredictability tends to extend the life cycle of only some individuals. Extreme extensions, such as diapause for more than 10 years, usually affect only a very small fraction of the population. Modest extensions, such as development over 2 years, prolonged dormancy for one additional adverse season, cohort-splitting between 1- and 2-year life cycles, and oviposition over two seasons, are relatively common. Insects with long life cycles provide insights into the nature of adaptations to adverse and unpredictable conditions, and also provide useful material for the analysis of questions related to population and community structure.

How Infrastructure Public–Private Partnership Projects Change Over Project Development Phases

2018 ◽  
Vol 49 (4) ◽  
pp. 62-80 ◽  
Author(s):  
Andrew South ◽  
Kent Eriksson ◽  
Raymond Levitt
Keyword(s):  
Life Cycle ◽  
Public Private Partnership ◽  
Institutional Logic ◽  
Private Partnership ◽  
Highway Transportation ◽  
Development Phases ◽  
Long Life ◽  
Stakeholder Network ◽  
Developmental Phases

This research adds to work on the development of infrastructure public–private partnership projects (P3s), which is a rapidly growing mode of infrastructure service delivery. Infrastructure P3 projects typically have a long life cycle, but little is understood about the nature of the changes that such a project goes through over the phases of its life cycle. This article contributes to project research as it studies the changes that an infrastructure P3 project goes through over its life cycle and suggests how those changes can be governed over the life cycle of the project. The research is empirically informed from an in-depth case study of a highway transportation P3 in California over a 20-year period. This research shows that the developmental phases of P3s differ by dramatic changes in the composition of stakeholder networks and the use of institutional logic. First, employing social network analysis (SNA), we map the network of stakeholders in the P3 case and show how the stakeholder network changes over four phases. Second, we identify how different stakeholders use formal and informal institutional logic in their interactions, and demonstrate that the dominant institutional logic employed in the P3 changes from informal to formal over the P3’s life cycle. We further show how this change in the P3’s dominant institutional logic corresponds to the dynamism in the stakeholder network. We propose that infrastructure P3s should be analyzed and governed as the dynamic arrangements they are—constellations of stakeholders that change individually and undergo change collectively over a long life cycle of different phases.

Data Warehouse Testing

2013 ◽  
pp. 91-108
Author(s):  
Matteo Golfarelli ◽  
Stefano Rizzi
Keyword(s):  
Life Cycle ◽  
Data Warehouse ◽  
Design Method ◽  
Real Case ◽  
Data Mart ◽  
Design Life ◽  
Software Product ◽  
Reference Design ◽  
Warehouse Design

Testing is an essential part of the design life-cycle of a software product. Although most phases of data warehouse design have received considerable attention in the literature, not much research has been conducted concerning data warehouse testing. In this paper, the authors introduce a number of data mart-specific testing activities, classify them in terms of what is tested and how it is tested, and show how they can be framed within a reference design method to devise a comprehensive and scalable approach. Finally, the authors discuss some practical evidences emerging from a real case study.

Exploring the life cycle of family-owned tourism businesses in maturity

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Beatriz Adriana López-Chávez ◽  
César Maldonado-Alcudia
Keyword(s):  
Life Cycle ◽  
Design Methodology ◽  
Multiple Case Study ◽  
Theoretical Models ◽  
Tourism Industry ◽  
Family Ownership ◽  
Content Type ◽  
The Family ◽  
Multiple Case

PurposeThe aim of this paper is to analyze the life cycle of family-owned hotels in the maturity phase from the integration of theoretical models for family-owned tourism businesses.Design/methodology/approachA qualitative multiple case study was used to analyze four mature family-owned hotels through eight interviews and four observation guides with an abductive method. Three axes were analyzed; the ownership with the Gersick model, the family with the Tobak and Nábradí model and the business with the Butler tourist areas model to identify whether they are going through the consolidation stage, stagnation, rejuvenation or decline within its maturity.FindingsThe cases studied evolve in the three axes. In the business axes, two go through the stagnation stage, another in decline and the last in consolidation; all remain under controlling owners. In the family, there are different generations in charge. The boost to the destination plays a key role as a force for deterministic change in the internal transformation of these organizations, and to remain in consolidation, discontinuous changes and voluntaristic actions are necessary.Originality/valueFamily businesses seek longevity, although a low percentage reaches maturity. This research proposes the integration of life cycle models to understand its development in the axes of family, ownership and business, where aspects of the tourism industry are considered and allow the stage identification through which it passes in maturity, supporting internal decision making.

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