An integrated simulation model for opportunistic maintenance

2019-01-01
Maintenance policies embody various work packages with different intention of implementation. When and how to perform these work packages for which equipment is always a problem that needs to be solved specific to the machine itself. Since a surface mining operation is carried out generally in demanding working conditions and multiple equipment hold an operational dependency to accomplish a production cycle, it may be tough to constitute the scope and content of the related maintenance policy. Although the literature on maintenance modelling commonly concentrates on corrective repairing and preventive replacement, opportunistic maintenance that investigates whether an opportunity exists for the proactive maintenance of a running component in case of failure of another dependent component is not discussed as required. Indeed, opportunistic maintenance is practically observed at mine sites. In this basis, the current study aims to develop an integrated simulation model that considers mathematical interaction of corrective, preventive and opportunistic maintenance, and their effects on stochastic uptime and downtime behavior of systems. A numerical example applied for multiple shovels is also provided to highlight the outcomes of the developed model

Suggestions

A certificate based, context aware access control model for multi domain environments
Yortanlı, Ahmet; Koçyiğit, Altan; Department of Information Systems (2010)
A certificate based approach is proposed for access control operations of context aware systems for multi domain environments. New model deals with the removal of inter-domain communication requirement in access request evaluation process. The study is applied on a prototype implementation with configuration for two di erent cases to show the applicability of the proposed certificate based, context aware access control model for multi domain environments. The outputs for the cases show that proposed access ...
A logic programming framework for modeling temporal objects
Çiçekli, Fehime Nihan; Sergot, M (1996-10-01)
We present a general approach for modeling temporal aspects of objects in a logic programming framework. Change is formulated in the context of a database which stores explicitly a record of all changes that have occurred to objects and thus (implicitly) all states of objects in the database. A snapshot of the database at any given time is an object-oriented database, in the sense that it supports an object-based data model. An object is viewed as a collection of simple atomic formulas, with support for an ...
An automated system repair framework with signal temporal logic
Ergurtuna, Mert; Yalcinkaya, Beyazit; Aydın Göl, Ebru (2021-01-01)
We present an automated system repair framework for cyber-physical systems. The proposed framework consists of three main steps: (1) system simulation and fault detection to generate a labeled dataset, (2) identification of the repairable temporal properties leading to the faulty behavior and (3) repairing the system to avoid the occurrence of the cause identified in the second step. We express the cause as a past time signal temporal logic (ptSTL) formula and present an efficient monotonicity-based method ...
A cost-effective simulation algorithm for inspection interval optimization: An application to mining equipment
Gölbaşı, Onur; Demirel, Nuray (2017-11-01)
In machinery maintenance policies, regular inspection intervals should be specified in such a way that the cumulative of direct and indirect financial consequences of maintenance activities should be minimized while supporting the functional health of system components. This study aims to develop a simulation algorithm, called the time-counter, to optimize inspection intervals. In the algorithm, uptime and downtime behaviors of the system components and production losses in the corrective repairs are consid...
An intelligent process planning system for prismatic parts using STEP features
Amaitik, Saleh M.; Kilic, S. Engin (Springer Science and Business Media LLC, 2007-01-01)
This paper presents an intelligent process planning system using STEP features (ST-FeatCAPP) for prismatic parts. The system maps a STEP AP224 XML data file, without using a complex feature recognition process, and produces the corresponding machining operations to generate the process plan and corresponding STEP-NC in XML format. It carries out several stages of process planning such as operations selection, tool selection, machining parameters determination, machine tools selection and setup planning. A h...
Citation Formats
O. Gölbaşı and C. Karpuz, “An integrated simulation model for opportunistic maintenance,” 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51999.