Daneshkhah, Alireza, Stocks, Nigel G. and Jeffrey, Paul (2017) Probabilistic sensitivity analysis of optimised preventive maintenance strategies for deteriorating infrastructure assets. Reliability Engineering & System Safety, 163 . pp. 33-45. doi:10.1016/j.ress.2017.02.002

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Abstract

Efficient life-cycle management of civil infrastructure systems under continuous deterioration can be improved by studying the sensitivity of optimised preventive maintenance decisions with respect to changes in model parameters. Sensitivity analysis in maintenance optimisation problems is important because if the calculation of the cost of preventive maintenance strategies is not sufficiently robust, the use of the maintenance model can generate optimised maintenances strategies that are not cost-effective. Probabilistic sensitivity analysis methods (particularly variance based ones), only partially respond to this issue and their use is limited to evaluating the extent to which uncertainty in each input contributes to the overall output's variance. These methods do not take account of the decision-making problem in a straightforward manner. To address this issue, we use the concept of the Expected Value of Perfect Information (EVPI) to perform decision-informed sensitivity analysis: to identify the key parameters of the problem and quantify the value of learning about certain aspects of the life-cycle management of civil infrastructure system. This approach allows us to quantify the benefits of the maintenance strategies in terms of expected costs and in the light of accumulated information about the model parameters and aspects of the system, such as the ageing process. We use a Gamma process model to represent the uncertainty associated with asset deterioration, illustrating the use of EVPI to perform sensitivity analysis on the optimisation problem for age-based and condition-based preventive maintenance strategies. The evaluation of EVPI indices is computationally demanding and Markov Chain Monte Carlo techniques would not be helpful. To overcome this computational difficulty, we approximate the EVPI indices using Gaussian process emulators. The implications of the worked numerical examples discussed in the context of analytical efficiency and organisational learning.

Item Type:	Journal Article
Subjects:	H Social Sciences > HC Economic History and Conditions T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Infrastructure (Economics) -- Maintenance and repair -- Cost effectiveness -- Mathematical models
Journal or Publication Title:	Reliability Engineering & System Safety
Publisher:	Elsevier Ltd.
ISSN:	0951-8320
Official Date:	July 2017
Dates:	Date Event July 2017 Published 21 February 2017 Available 18 February 2017 Accepted 4 January 2016 Submitted
Volume:	163
Page Range:	pp. 33-45
DOI:	10.1016/j.ress.2017.02.002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), European Commission (EC)
Grant number:	EP/K012347/1, EP/L027682/1 (EPSRC), TRUST Project-Grant 265122 (EC)
Adapted As:
Related URLs:	http://dx.doi.org/10.1016/j.ress.2017.02...

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