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Improving availability of hydraulic drive systems through knowledge engineering
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This Master’s thesis was developed at the Division of Computer Aided Design (CAD) at Luleå University of Technology [1]. A research project called SSPI (Scalable search of product lifecycle information) [2] was initiated by Luleå University of Technology [3] and Uppsala University (UDBL) [4], where the main goal was to develop software systems for efficient and scalable search of product data and meta- knowledge produced during the entire product lifecycle. The project was intended to develop such software systems based on Data Stream Management Systems (DSMS) and the semantic web model. In the SSPI project the goal was also to build two demonstrators based on case studies in industry. High reliability and availability are important customer demands that are currently increasing in industrial significance. Through better monitoring of critical systems and system parameters, failures can be detected, predicted and avoided before damage occurs. This is, of course, beneficial for the customer. Improving monitoring is of interest for Hägglunds Drives (HDAB) [5], which is why the thesis work was initiated as a part of the SSPI project. Hägglunds Drives participated in this project as an industrial partner in order to learn more about the aforementioned approaches and thereby increase their product availability. In this thesis work a specific drive called a kiln drive was analyzed to determine what can be done from a monitoring perspective to increase availability and reliability. During the thesis work, HDAB conducted a test of a drive, whereby a long- life test of oil was carried out in their laboratory and compared to normal, reduced oil level in the system. The “tank test,” as the system will be referred to, was equipped with sensors to monitor the condition of the system. According to HDAB, this system was comparable to the kiln drive. To verify this, the thesis work included comparison of these two systems. The aim was to investigate if the available tank test could be used for analysis instead of the kiln drive. To find common failures that have occurred in kiln drives, interviews with HDAB representatives where conducted, afterwards a simplified FMEA (Failure mode and effect analysis) and a FTA (Fault tree analysis) were performed. The results from the FMEA and FTA analyses were a list of suggested measurement points that are recommended to be monitored to predict, prevent and discover the most critical failure modes. The results from the comparison between the these two systems showed that most failure modes occurring in the kiln drive would be expected to occur in the tank test, and due to this, analysis are possible to perform on the tank test. A set of rules was also created, the rules are based on relations between different system parameters and are intended to increase the availability of the drive system by predicting and preventing failures before they occur. The rules provide a basis for implementing a software system to perform monitoring. Translations of the rules into computer code are necessary if the system is to be implemented. The rules were presented to and validated by HDAB within the scope of the thesis work presented here. This collected information will be fed into the SSPI project as information about what to search for in data streams from the case study, so as to increase the reliability and availability of the kiln drive.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-45434ISRN: LTU-EX--10/072--SELocal ID: 31fb489d-4b05-4ee3-a38e-e1208e85a67dOAI: diva2:1018725
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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