The aim of this paper is to discuss the modelling and optimization of condition-based maintenance policies for systems is submitted to usage profile changes. The considered system undergoes a monotone deterioration (gamma process) and its is impacted by the usage conditions (covariates) via the proportional hazards model. Four different policies are proposed and the optimal maintenance paramete...

Reliability analysis for liquefied natural gas (LNG) pipeline network brings researchers huge challenges because the system experience multiple dependent competing failure processes. Based on system reliability R(t) and time to failure distribution f(t) analyzed from system failure modes and mechanisms, we can generate LNG pipeline life data. Different maintenance policies can be considered as ...

In this paper, we will present an approach for assessment and ranking of maintenance process performance indicators using the fuzzy set approach and genetic algorithms. Weight values of maintenance process indicators are defined using the experience of decision makers from analysed SMEs and calculated using the fuzzy set approach. In the second step, a model for ranking and optimization of main...

Implementation of a Distributed Control System (DCS) provides for significant regulatory control benefits through improved control capabilities, increased system reliability, and in reducing overall maintenance costs. The DCS control and economic benefits are commonly supplemented through commissioning of advanced control applications, model-based predictive controllers, unit optimization, and ...

This paper presents a dynamic maintenance grouping strategy for multi-component systems with both “positive” and “negative” economic dependencies. Positive dependencies are commonly due to setup cost whereas negative dependencies are related to shutdown cost. Actually, grouping maintenance activities can save part of the setup cost, but can also in the same time increase the shutdown cost. Unti...

Shop floor level operations planning significantly affect the production system performance. Traditionally, in a production system, maintenance planning and production scheduling have been considered and optimized independently. However, these two aspects of operations planning do have an interaction effect on each other and hence need to be considered jointly for improving the system performan...

The purpose of this work is to minimize off-grid Diesel generation costs by best choosing the number, size and dispatch schedule of the generators comprising the power plant. The mathematical formulation of the optimization problem takes into account: sizedependent full-and part-load fuel consumption; size dependent investment costs; sizeand dispatch-dependent operational and maintenance costs....

Software Testing is continuous process of development and maintenance in life of software. In maintenance phase, regression testing gets exercisedwith additional resources/time for performance. The prioritization of test cases helps to reduce the cost-time of regression testing. Hence, completing Regression Testing effectively and on schedule is challenge for software tester. In this research p...

An optimization method for condition based maintenance (CBM) of aircraft fleet considering prognostics uncertainty is proposed. The CBM and dispatch process of aircraft fleet is analyzed first, and the alternative strategy sets for single aircraft are given. Then, the optimization problem of fleet CBM with lower maintenance cost and dispatch risk is translated to the combinatorial optimization ...