Jeff A Jones

University of Warwick · Warwick Manufacturing Group

Previous studies suggest that paid employment can improve workers’ mental health status by offering a series of manifest and latent benefits (i.e., income, self-achievement and social engagement), which motivates policymakers’ ongoing promotion of labour force participation as an approach to protect women’s mental health status. This study extends...

Complex systems are expected to play a key role in the progress of Prognostics Health Management but the breadth of technologies that will highlight gaps in the dynamic regimes are expected to become more prominent and likely more challenging in the future. The design and implementation of sophisticated computational algorithms have become a critic...

Complex systems are expected to play a key role in the progress of Prognostics Health Management but the breadth of technologies that will highlight gaps in the dynamic regimes are expected to become more prominent and likely more challenging in the future. The design and implementation of sophisticated computational algorithms have become a critic...

The role of prognostics and health management is ever more prevalent with advanced techniques of estimation methods. However, data processing and remaining useful life prediction algorithms are often very different. Some difficulties in accurate prediction can be tackled by redefining raw data parameters into more meaningful and comprehensive healt...

Prognostic performance is associated with accurately estimating remaining useful life. Difficulty in accurate prognostic applications can be tackled by processing raw sensor readings into more meaningful and comprehensive health condition indicators that will then provide performance information for remaining useful life estimations. To that end, t...

In this data article, a reconstructed database, which provides information from PHM08 challenge data set, is presented. The original turbofan engine data were from the Prognostic Center of Excellence (PCoE) of NASA Ames Research Center (Saxena and Goebel, 2008), and were simulated by the Commercial Modular Aero-Propulsion System Simulation (C-MAPSS...

Over the last decade, the prognostics and health management literature has introduced many conceptual frameworks for remaining useful life predictions. However, estimating the future behavior of critical machinery systems is a challenging task due to the uncertainties and complexity involved in the multi-dimensional condition monitoring data. Even...

Prognostics is a promising approach used in condition based maintenance due to its ability to forecast complex systems' remaining useful life. In gas turbine maintenance applications,data-driven prognostic methods develop an understanding of system degradation by using regularly stored condition monitoring data, and then can automatically monitor a...

Purpose – The purpose of this paper is to test the degree of understanding of traceability concept, drivers, systems’ characteristics, benefits and barriers, and frameworks with focus on UK small and medium businesses (SMEs) that operate in the food supply chain (FSC). Design/methodology/approach – This study employs a survey strategy by means of...

In this paper the awareness and attitudes towards traceability are examined in the food supply chain (FSC) within UK Small and Medium-sized Enterprises (SMEs). The objective of this paper is to test some propositions found in the literature, and understand whether or not SMEs in the UK are aware of the main objectives of traceability and what impor...

Failure modes are an inevitable consequence of the Product Development (PD) process. They are crucial in their impact on product design since they affect product quality and costs because of the requirement for counter measures, thus potentially imposing high risks on any organization engaged in pro duct development in terms of customer dissatisfac...

Failure modes are an inevitable consequence of the Product Development (PD) process. They are crucial in their impact on product design since they affect product quality and costs because of the requirement for counter measures, thus potentially imposing high risks on any organization engaged in product development in terms of customer dissatisfact...

In order to fully understand the reliability issues around MEMS device a means of carrying out accelerated testing is required. This research investigated the use of mechanical means to actuate MEMS membranes so that lifetime estimates could be obtained. A Talysurf measurement system was adapted to allow a MEMS membrane to be cycled by moving it wi...

Not all implementations of reliability are equally effective at providing customer and user benefit. Random system failure with no prior warning or failure accommodation will have an immediate, usually adverse impact on operation. Nevertheless, this approach to reliability, implicit in measurements such as ‘failure rate’ and ‘MTBF’, is widely assum...

The REMM process is a holistic approach to reliability analysis and evaluation. It focuses on design for reliability and takes a proactive approach to reliability assessment. REMM is a collaborative UK funded research project that has spent the last 6 years investigating all aspects of design for reliability as well as reliability assessment and pr...

Weibull analysis offers considerable insight into the lifetime reliability of products. However, there are also many ways that analysis can be corrupted. Today's increased use of excellent computer software will, in many cases, simply speed the corruption. Most errors originate in the choice and application of data. Long-term experience indicates t...

Recent thinking within reliability practice has led to a move away from the specification of a set of prescriptive methods that the supplier must undertake to a co-operative approach which requires the exchange of information between the customer and the supplier in order to provide assurance that the product will meet the reliability requirements....

Over the last 50 years reliability has come a long way, this is often due to the work of many minor figures and numerous small improvements in practice but as in any human endeavour there have been, and are, major figures with much influence and large forces for change and these will cause significant, sudden changes. Work has been carried out at t...

The introduction of high reliability systems combined with new ways of operating complex systems, particularly in aircraft design and operation has received much attention. Some systems are now being introduced into service, however, justifying such systems on a financial basis is difficult and may act to limit the rate of introduction on new produ...

The ASPIRE Business Model incorporates the essential business features that will enable and foster exceptional reliability as a market differentiator. The key features are: (1) create a win-win scenario from the outset, fostering success in both manufacturer and customer objectives whilst simultaneously working within technical, business and legisl...

Reliability and maintenance are not direct customer requirements. Rather, customer requirements should be expressed in terms of the benefits reliability and maintenance can deliver. Customer requirements are generally maximisation or minimisation of scenario objectives such as safety, operational success and whole-life costs. Identification of the...

During design of a high-fidelity discrete event simulation (DES) of aircraft reliability and maintenance under realistic operational scenario, modelling of complex system functionality and control of the associated state-space explosion, was a major concern. Hierarchical system decomposition limited this explosion but correct and efficient analysis...

The REMM (reliability enhancement methodology and modelling) programme is about improving the prediction of equipment reliability by using a holistic technique, which draws on expert knowledge, backed up by data collected throughout the entire product lifecycle. In order to support such a system the REMM database programme will extract data from th...

As part of the reliability enhancement methodology and modelling (REMM) project an expert system has been developed that will examine the design decisions made in the production of a new product, combine this with the concerns raised by company experts during an elicitation process, the environmental consideration for product operation and the depe...

The aerospace industry is moving towards a new paradigm for the statement of reliability specifications. This paradigm is not a technical metric inherent to a system in isolation, but rather encompasses the wider objectives, operational profile and logistic priorities of its customer. This customer focus is encapsulated in the metrics Failure Free...

Customers demand reliable products and such demands are reflected in the product specification and requirements documents. Indeed, contractual obligations are being introduced to ensure that the supplier meets the cost of unreliability. Thus, equipment suppliers must design products to perform reliably for the required product life. Moreover suppli...

The concept of maintenance free operating periods (MFOP) requires co-ordination of failure avoidance, failure anticipation and maintenance delay techniques, with the objective of enhancing operational capability in a cost-effective manner. Individual aspects might be modelled mathematically but discrete event simulation is required for an analysis...

In order to ensure that the Ultra Reliable Aircraft Model (URAM) simulates maintenance free operation (MFOP) with sufficient fidelity, it has been necessary to model component reliability as modified by usage and stress during operational activity, to incorporate complex system functional definitions, and to allow flexible treatment of maintenance....

The REMM (reliability enhancement methodology and modelling) methodology which provides guidelines on how to use existing reliability tools more effectively should ensure greater product reliability, reduce costs of rework and spares provisioning and provide greater customer confidence and satisfaction. Use of the REMM statistical model provides an...

This paper investigates the occurrence of the NFF (no fault found) failure in electronic equipment. The main types of NFF are outlined, and then the results of accessing the Loughborough University reliability database to investigate the root causes of NFF is discussed. The presence of complex components and connectors and the effect of equipment c...

One of the most controversial techniques in the field of reliability is reliability-prediction methods based on component constant-failure-rate data for the estimation of system failure rates. This paper investigates a new reliability-estimation method that does not depend upon constant failure rates. Many boards were selected from the Loughborough...

This paper describes a discrete event simulation model that allows a system designer to investigate the means and feasibility of meeting an operating period requirement. The model takes into account the system reliability, the proposed mission tasking and the maintenance support regime. The life of individual basic items may be modelled using any a...

One of the most controversial procedures in reliability is the use of reliability prediction techniques based on component failure data to estimate system failure rates. The International Electronics Reliability Institute (IERI) at Loughborough University is in a unique position. Over many years, much reliability information has been collected from...

Parametric drift modelling describes the behaviour of components as they drift away from their nominal values. It permits the mean lifetime prediction of components which have known wear-out phenomena associated with them, e.g. mechanical parts, laser diodes etc. This form of modelling of wear-out allows the setting of optimal maintenance periods w...

Before any reliability improvement can be made to a product it is necessary to assess the current reliability in the field. This can be achieved by collecting field failure information throughout a products' life and performing analysis on this data. This reliability analysis enables the manufacturer to assess and improve the dependability of the p...

Considerable attention has been paid recently to the behaviour of the hazard rate function h ( t ) as a function of time. This discussion has led to a lot of speculation as to the shape of the traditional ‘bathtub’ curve showing failure or hazard rate as a function of time. Studies at the International Electronics Reliability Institute (IERI) at Lo...