Impact of Machine-Failure Costs on Equipment Replacement Policies: Tunneling Company Case Study

2012 ◽  
Vol 138 (6) ◽  
pp. 767-774 ◽  
Author(s):  
Luis F. Alarcón ◽  
Andrés Rodríguez ◽  
Claudio Mourgues
Keyword(s):  
Equipment Replacement ◽  
Machine Failure

scholarly journals A Conceptual Framework for Equipment Maintenance Automation under a Pyroprocessing Automation Framework

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Jonghui Han ◽  
Dongseok Ryu ◽  
Doyeon Kim ◽  
Jongkwang Lee ◽  
Seungnam Yu ◽  
...  
Keyword(s):  
Basic Operation ◽  
Hardware In The Loop ◽  
Equipment Replacement ◽  
Remote Handling ◽  
Remote Maintenance ◽  
Maintenance Activities ◽  
In Situ Repair ◽  
Automation Framework

For most of the remote maintenance activities of equipment in a hot cell, replacing breakdown modules is preferred over in situ repair because of insufficient space in the cell and the limited operability of remote handling tools. In such cases, the maintenance operation can be decomposed into transport of the new modules to the failed equipment, replacement of the broken modules with new ones, and then transport of the broken parts to the reserved space for further repair or disposal. In this respect, transfer is the most basic operation during remote maintenance, which is also true for the maintenance of pyroprocessing equipment. Hence, this paper proposes a maintenance automation framework for automated pyroprocessing equipment from the standpoint of module transfer. For the maintenance automation framework, maintenance-related functions and events are defined, and they are integrated with the pyroprocess automation framework. The proposed framework is verified by a case study on the maintenance of a large module through a hardware-in-the-loop simulation.

An Application of Reliability Centered Maintenance Technique for Preventive Maintenance in Refinery Plant

2016 ◽  
Vol 848 ◽  
pp. 244-250
Author(s):  
Itthipol Nakamanuruck ◽  
Sompoap Talabgaew ◽  
Vichai Rungreunganun
Keyword(s):  
Preventive Maintenance ◽  
Risk Level ◽  
Reliability Engineering ◽  
Machine Maintenance ◽  
Machine Failure ◽  
Reliability Centered Maintenance ◽  
Maintenance Program ◽  
Refinery Plant ◽  
Maintenance Plan

This research aims for guidance in improving the productivity of the machines in case study of refinery plant based on the principle of preventive maintenance of machinery applications. This is to increase the availability and improve the reliability and overall equipment effectiveness (OEE) of the machines. From the data collected showed that high cost of maintenance is quite high caused by non-standard maintenance and no prioritization of machine maintenance. Therefore, the researchers proposed a maintenance program developed based on reliability engineering with failure mode and effects analysis (FMEA). FMEA was the first brought to analyze the root causes of machine failure and to evaluate the risk priority number (RPN). The data was performed preventive maintenance plan standardized the maintenance system in order to optimize maintenance task and maximize the efficiency of machinery. After applying FMEA, the result showed that the chance of failure in equipment was very low (1 time in 12 years) after the scheduled maintenance plan and opportunities to detect damage in advance was moderate to high. Therefore, the equipment with a moderate to high risk is likely more damage than the first round of maintenance (5 years). Moreover, the average of the residual risk level analysis of the machine decreased by 59.165% and overall equipment effectiveness (OEE) increased from 92.66% to 98%

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

Sociocultural memory development research drives new directions in gadgetry science

2019 ◽  
Vol 42 ◽  
Author(s):  
Penny Van Bergen ◽  
John Sutton
Keyword(s):  
Episodic Memory ◽  
Autobiographical Memory ◽  
Developmental Psychology ◽  
Cross Cultural ◽  
Memory Development ◽  
Development Research ◽  
Cultural Research ◽  
New Directions ◽  
Cross Cultural Research

Abstract Sociocultural developmental psychology can drive new directions in gadgetry science. We use autobiographical memory, a compound capacity incorporating episodic memory, as a case study. Autobiographical memory emerges late in development, supported by interactions with parents. Intervention research highlights the causal influence of these interactions, whereas cross-cultural research demonstrates culturally determined diversity. Different patterns of inheritance are discussed.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

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