| 1. |
- Akersten, Per-Anders
(författare)
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Condition monitoring and risk & relability analysis
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 555-561
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Konferensbidrag (refereegranskat)abstract
- Qualitative and semi-quantitative reliability and risk analyses are usually performed, using inductive analysis approaches, e.g. FMEA/FMECA (Failure Mode and Effects [Criticality] Analysis), PHA (Preliminary Hazard Analysis) or HAZOP (Hazard and Operability Study). After the identification of possible failure modes or hazards, their possible effects at different system levels are estimated. In several cases the possible effects at higher system levels are very severe, indicating that the system under study is highly unreliable or hazardous. This conclusion, however, can be modified by taking into account the effect of current controls or countermeasures that can reduce the likelihood of an adverse effect or reduce the severity. Condition monitoring provides a useful risk control approach, primarily aiming at reducing the likelihood of an adverse effect. In this paper this risk control approach is described in some more detail and a proposed methodology is described. This methodology combines FMEA and ETA (Event Tree Analysis), with special attention taken to the utilization of Condition Monitoring.
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| 2. |
- Al-Najjar, Basim
(författare)
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Total Quality Maintenance for Assuring Continuous Improvement of Company’s Profitability and Competitiveness : Case Studies
- 2006
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Ingår i: Condition monitoring and diagnostic engineering management. - : Luleå universitet, Luleå. - 9789163188060 ; , s. 181-190
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Konferensbidrag (refereegranskat)abstract
- Industries with intensive invested capital demands healthy processes continuously to achieve their economic goals, because any interruption of the production caused by any equipment malfunction or failure may result in a major disruption of output or even production shutdown. Thus, an effective maintenance concept should be evolved to provide the required tools, data and methods for detecting deviations at an early stage to maintain and enhance the availability of machinery, product quality and profits. A new concept of condition-based maintenance (CBM), Total Quality Maintenance (TQMain) is presented. It aims to maintain not only machines but the quality of the essential elements involved in the production process, such as methods, operational conditions, personnel competence, raw material, quality and managerial systems. The major results have achieved in this study areEvidence of prolonging the bearing's mean effective live by using more accurate diagnosis and prognosis are confirmed when faulty bearing installation, faulty machinery design and harsh environmental condition are considered.Changes in the machine speed and load influence the information delivered by vibration signals.Applying vibration spectral analysis, it is possible to detect the deviations in the quality of a product during the processing time and before it is completed.Maintenance profit of one paper machine was found to be at minimum about 3.58 MSEK yearly.The main conclusion is; identifying and eliminating causes behind deviations in quality and equipment condition at an early stage are vital to accomplish continuous improvements and to assure longer machine live and high quality products at competitive price. Several case studies have been conducted during the last ten years to verify the applicability and benefits of TQMain are discussed
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| 3. |
- Bengtsson, Marcus, et al.
(författare)
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The Factory-in-a-Box Concept and Its Maintenance Application
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Managmement. - Lulea, Sweden. - 9789163188060 ; , s. 161-170
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Konferensbidrag (refereegranskat)abstract
- The “Factory-in-a-Box” concept is currently being developed in a Swedish research project and consists of standardized production modules that are installed in a container and transported by e.g. a truck or by train. The modules may rapidly be combined into production systems that can be reconfigured for a new product and/or scaled to handle new volumes. The key features of this futuristic production system concept are thus flexibility, mobility, and speed. The objective with this paper is to discuss how research within the area of maintenance and condition monitoring will help realizing flexibility, mobility, and speed within the Factory-in-a-Box concept. The paper presents how maintenance will be an important enabler in the Factory-in-a-Box project and will explain and describe how maintenance should be used in achieving high availability.
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| 4. |
- Bennitz, Anders, et al.
(författare)
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Dynamic behaviour of the Vindel River railway bridge
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 721-729
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Konferensbidrag (refereegranskat)abstract
- The Swedish Railway administration has launched several projects aimed at increasing the accessibility of the railway lines in northern Sweden to meet future demands. One of these lines connects the southern and northern parts of Sweden and constitutes one of the major arteries for the transportation of heavy goods. Major investment are planned to upgrade the load bearing capacity of this railway line. The work is mainly focused on the larger structures and their dynamical properties. These properties can be used to assess existing infrastructure and to evaluate the performance. Advantages are obvious since the existing structural integrity form the base for investments in structural repair and upgrade of bridges. The Vindel River Railway Bridge situated 55 kilometers northwest of Umeå came into focus when large motion was discovered during train passages. The behaviour of the bridge crossing the river of Vindeln has been measured two times. Measurements of displacements and acceleration of the bridge during train passages has been conducted, the first measurements was done to give more experience on the motion of the bridge and to try out new sensors. The second measurement gave more information about the bridge's motion, results that could be used to calibrate a 3D FE-Model of the bridge used in the study. Based on the measurements, eigenfrequencies in the range of 0 to 8 Hz could be detected, modal shapes up to the ninth order could be extracted, deflections and transverse displacements for different sets of train and different train speeds were also found. However, new measurements are planned for this summer and will hopefully reinforce the already attained result and give answers to some of the unresolved questions.
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| 5. |
- Candell, Olov, et al.
(författare)
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A customer and product support perspective of e-maintenance
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 243-252
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Konferensbidrag (refereegranskat)abstract
- Today the providers of customer and product support related to military aircraft are facing major challenges. Traditionally, aircraft systems have stringent requirements on safety. In addition to this, the requirements on dependability, costs, and security have increased in importance. These changes, together with an increased diversity of customer requirements in a global utilization environment, add to the complexity of providing appropriate support solutions. The increased customer requirements have also lead to concepts such as total solution selling, or functional products, where the customers are offered availability performance to a fixed price. In order to enable efficient support solutions in a global support environment, e-Maintenance is seen as one important building block. e-Maintenance includes monitoring, collection, and distribution of realtime system health data and information to all stakeholders independent of organizational belonging or geographical location, 24 hours a day, 7 days a week (24-7). The concept of e-Maintenance is realized through the application of Information & Communication Technology (ICT), which integrates built-in tests, external tests at different maintenance echelons, and other sources of support information. The purpose of this paper is to describe important requirements and expectations that a provider of customer and product support related to military aircraft systems has on e-Maintenance in a global support environment.
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| 6. |
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| 7. |
- Chattopadhyay, G., et al.
(författare)
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Estimation of parameter for rail degradation
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 605-612
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Konferensbidrag (refereegranskat)abstract
- Rail degradation is a significant problem for rail industries. Wear and fatigue comprises major component of rail degradation. It depends on operational conditions such as train speed, axle load, rail-wheel material type, size and profile, track construction, characteristics of bogie type, Million Gross Tonnes (MGT), curvature, traffic type, weather and environmental conditions. Development of prediction model related to those defects leading to rail breaks and/or rail replacements is vital for economic and safe operation of rail services. Estimation of parameter for failure models is necessary for accurate prediction of expected number of rail defects over a period of time based on Million Gross Tonnes (MGT) traffic, operating conditions and maintenance strategies. This paper focuses on collection and analysis of field data for various defects developed in rail track over a period of time for estimation of parameter for models predicting degradation of rails.
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| 8. |
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| 9. |
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| 10. |
- Delsing, Jerker
(författare)
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Device and system diagnosis based on embedded sensing and intelligence
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management, COMADEM 2006. - Luleå : Luleå tekniska universitet. - 9789163188060
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Maintenance of industrial infrastructure, machinery and communication is becoming a more and more critical issue in our society. The technology development in sensors and sensor networks will enable the embedding of "intelligence" into infrastructure, machinery and communication. Here Internet will become the communication paradigm to build on and already available communication infrastructure like the mobile phone networks will become the access network infrastructure. I will discuss such technology development including its capability for autonomous integration into its environment and autonomous operation. Thus enabling device and system diagnosis made available.
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| 11. |
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| 12. |
- Granström, Rikard, et al.
(författare)
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Verification and utilization of wheel impact detection systems
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 667-676
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Konferensbidrag (refereegranskat)abstract
- Defective rail wheels can cause severe damages to both track and vehicle components, which in worst case can lead to derailments with extensive losses. Wheel impact detection systems are intended to prevent railway damages and its related losses, through recognition of wheel defects and generation of alarms. At commissioning of a wheel impact detection system in Sweden, the commissioning study showed that the system was reliable, without generating any false alarms. However, during operation some of the system's alarms resulted in No Fault Found (NFF) events at subsequent manual inspections. Hence, a verification study was launched in order to determine if the cause of the NFF events were false alarms generated by the system, or the inability of subsequent manual inspection to replicate the system's test result. The verification study was expected to support an exclusion of the manual inspection, which was perceived to be the cause of the NFF events. However, an exclusion of the manual inspection would require the wheel impact detection system to be highly reliable, since it would be the primary foundation for decisions about both operation and maintenance. This study reports on vital experiences from the verification study and links these to experiences from other countries. The experiences highlight the importance of data accuracy and appropriate information management, in order to achieve the potential benefits and avoid the drawbacks of condition monitoring.
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| 13. |
- Ingwald, Anders, et al.
(författare)
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System for monitoring machines financial and technical effectiveness
- 2006
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Ingår i: Condition monitoring and diagnostic engineering management; COMADEM 2006. - 9789163188060 ; , s. 219-230
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Konferensbidrag (refereegranskat)abstract
- The positive effects of maintenance on product quality, machine, ability to deliver the expected production on time and on production costs are well accepted in the scientific community. Never the less, a survey made in Swedish industry indicates that the positive contribution of maintenance is in general still not recognised or fully understood. Maintenance is still to a great extent seen as an unnecessary cost. To make it possible to recognise the impact of maintenance on the production process, a simple to use and reliable system for assessing its impact is required. This system should assist in distinguishing effects from actions taken in different working areas such as maintenance and logistics to enhance process performance. In this article a simple and transparent system for monitoring the performance of a production process in financial terms with respect to maintenance effect is presented. This system is based on a model describing how performance of the production can be related to vibration-based maintenance. The main result presented in this paper is a simple, transparent and user-friendly system for monitoring and assessing the performance of the production process with respect to maintenance. The main conclusion is that using this system makes the hard task of monitoring maintenance impact on the production process easier and faster and thereby also easier follow up the cost-effectiveness of investment in maintenance.
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| 14. |
- Kans, Mirka
(författare)
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A HOLISTIC PERSPECTIVE OF COMPUTERISED MAINTENANCE MANAGEMENT SUPPORT
- 2006
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Ingår i: Proceedings of Condition Monitoring and Diagnostic Engineering Management. - : Luleå University of Technology Press, Luleå. - 9789163188060 ; , s. 892-
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Konferensbidrag (refereegranskat)abstract
- During the past four decades great progress within information handling and storage has been accomplished. The importance of enterprise information technology (IT) systems has increased in order to meet the demands set by the users. This is the case also for maintenance management IT, i.e. applications used for maintenance management purposes, such as computerised maintenance management systems or maintenance/asset management modules in enterprise resource planning systems. This paper discusses how the needs of maintenance management IT can be identified. It also studies the functionality of commercial maintenance management IT systems. Main result is a holistic model of maintenance management IT functionality and characteristics needs.
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| 15. |
- Nissen, Arne, et al.
(författare)
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Measuring the use of deviating train track
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 348-349
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Konferensbidrag (refereegranskat)abstract
- Turnouts used at the Swedish rail contribute to about 10 % of the yearly operation and maintenance cost and especially turnout extensively used for deviating track have high maintenance cost and more failures than those used mostly for main track. Therefore it is critical to have more information of how much the deviating track is used in practise. A measurement has been made to establish train speed, train weight, direction through the turnout and which path that has been used on a specific turnout. This type of measurement should be done on turnouts that have more problems to onfirm if the traffic is a major cause or not. There are two major sources for establish the information, one is measuring it at place and the other is to use information gathered by Banverket. The possibility and the cost of this type of investigation are discussed as well as the difference between the planned and actual use of the turnout.
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| 16. |
- Nyström, Birre, et al.
(författare)
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Description of railway delays : a study from the views of the stakeholders
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 701-710
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Konferensbidrag (refereegranskat)abstract
- The wish to improve quality of railway transport is facilitated by systematic feedback. Systematically describing delays and their causes is essential in improving punctuality. In this paper, requirements on a delay attribution system are discussed and analysed, in view of the current restructuring of the Swedish system. A freight train operating company, a p assenger train company and a maintenance contractor are interviewed in order to learn what features are considered important by them. Principles of delay attribution systems are discussed and suggestions for improvements are given.
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| 17. |
- Patra, Ambika Prasad, et al.
(författare)
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Life cycle cost estimation of railway track sytem
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 659-666
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Konferensbidrag (refereegranskat)abstract
- Railway track is the most maintained component in any rail infrastructure. Study shows a lot of money has been spent annually for better maintenance of track world wide and eventually Life Cycle Cost for the track goes very high. Manufacturers and service providers for the track system are trying hard to bring down the LCC cost and at the same time keeping the risk involved to it as low as possible. It has been seen that maintenance and operation cost always takes a major share of any LCC analysis. In this paper the authors have attempted to describe the methods to reduce the operation and maintenance cost and hence optimise the LCC with low risk involved. Railway track system consists of major components like rail, turnout, crosstie etc. Each part needs equal attention in terms of maintenance and cost. In a broad sense low maintenance and operation cost always accounts for high reliability, proper maintenance planning and scheduling, proper main power allocation and low spare part cost. The current paper focuses on finding methods to life period determination of the track, proper scheduling of preventive maintenance/overhauling, man power allocation for maintenance, spare parts quantity determination for all the major parts of the railway track system. Eventually the authors have tried to develop software which will determine the above mentioned parameters and hence calculate the Life Cycle Cost for the track system. The software will also help in determining the critical component(s) in the track system which need(s) more attention as far as LCC is concerned.
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| 18. |
- Phanse, Kaustubh, et al.
(författare)
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Study of IEEE 802.11 wireless networks in harsh environments
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060
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Konferensbidrag (refereegranskat)abstract
- IEEE 802.11 technologies are expected to remain the popular wireless local area networking solution for home and office environments. With growing interest within the process and manufacturing industry to go wireless, these technologies are a natural choice for enabling tetherless control and maintenance. However, the use of IEEE 802.11 suite of protocols for wireless access in unconventional, harsh environments is limited and their behavior and performance in these settings is not yet well understood. A prime example of such a setting is the LKAB underground iron-ore mine in Kiruna, Sweden. LKAB envisions an economical and effective wireless access solution in the mines for increasing automation, e.g., remotely control mining equipment such as mobile loading machines and drilling equipment. In this paper, we present our experiences of operating an IEEE 802.11g based wireless network in the LKAB underground iron-ore mine. Using measurements, we characterize and model the environment and its effect on the performance of higher layer protocols. We derive the theoretical limits of IEEE 802.11g and compare them with our experimental results. We observe a highly reflective environment in the mine, which causes multipath fading and in turn, considerably degrades the maximum achievable throughput in practice.
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| 19. |
- Puhan, Sanujeet, et al.
(författare)
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Maintenance management systems (MMS) using balanced scorecard (BSC) approach
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 409-414
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Konferensbidrag (refereegranskat)abstract
- Balanced Scorecard (BSC) approach to translate organizational strategy in to concrete objectives at operational level has worked and benefited a number of organizations. This is achieved through focus on all the four main perspectives simultaneously resulting in a balanced action plan strategy of the organization. While considering the production schedule, the objective of supply chain and maximizing the use of assets is constrained by the plant maintenance plan. Hence, analyzing the operation data and predicting the likelihood of failure to meet the production schedule still remains a main issue for the production units. The communication of failure prediction information from operational level to the corporate management meets the customer objectives of quality, delivery and support is critical. Similarly, the top-level information on customer feedbacks and preferences need to be passed down to improve the production process including design. The authors have presented an information system that can support the topdown conversion of organizational strategy into business unit strategy and production strategy.
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| 20. |
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| 21. |
- Wikstén, Johan, et al.
(författare)
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Automation of turbine engine trend analysis
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 67-74
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Konferensbidrag (refereegranskat)abstract
- Collecting engine performance data and analyzing the data for condition monitoring of the aircraft health status has been a challenging and most sought after task for the airline operators. If the health status of the engine is in a good level, then the time before overhaul (TBO) can be lengthened. The present excel system is old and aged and takes lot of time to record the data and analyze. There was a need for simpler and more accurate way to analyze and manage the data. As part of the project course study, the authors have tried to develop a system for plotting engine data, which are collected during the flight. The data were limited to torque, exhaust temperature, compressor and turbine speed, and fuel flow only for Pratt and Whitney engine PT6A-41.
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| 22. |
- Åhrén, Thomas, et al.
(författare)
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Maintenance performance measurement study at Banverket
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 643-649
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Konferensbidrag (refereegranskat)abstract
- Maintenance is an ongoing process for any system with the purpose to maintain given function during its lifetime. Since maintenance today is an integral part of the business process, correctly performed maintenance is known to create increased business value. However, still in various business sectors there is a great potential for continuous improvement of the maintenance process. Such improvements can be done by introducing a performance measurement system in a way that it supports the needs of core business processes, focusing on critical-strategic areas determined by the nature of the business, business concerns, and public requirements and regulations. The outcome from the maintenance process can be measured in terms of return on investments (ROI) and health, safety and environment (HSE); driven by such issues as integrity of the plant, adequate competencies, functional internal processes, and good internal and external relationships. This signifies a top-down approach underlying the importance to link the measures for operations and maintenance (i.e. the operations and maintenance performance measurement system) to overall business or organizational objectives by creating a logical cause-and-effect structure. In turn this also can be used as an effective basis to pinpoint those measures that should become ‘key performance indicators'. The final output from this is a link-and-effect model, showing how the operations and maintenance process contributes to overall business objectives. In the last years, a ROI-based framework for operations and maintenance performance measurement systems has been introduced into such industries where maintenance is performed by the company themselves. On the basis of the above, this paper presents how maintenance ROI can be adapted, measured, and linked to overall objectives in governmental appropriated organizations like the Swedish National Rail Administration (Banverket) where maintenance is outsourced.
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