This diploma thesis concerns issues of predictive and condition based maintenance system of machine tools with using a vibrodiagnostics. It studies and researches its impacts through the basic processes of the maintenance system and characterizes the vibration diagnosis as its tool and mean. There is also described a process of putting condition based maintenance into practice in the practical part of the thesis. The development is realized at Siemens Ltd. Brno with all its requirements and aspects such as a maintenance audit which means the decision on the suitability of condition based maintenance within the current maintenance system, technical analysis as a part of introduction of vibration diagnosis and the practical example of acquiring, recording and assessment of measured vibration. Prior to the end the economic evaluation of the planned predictive maintenance system and the design of the general model of development and implementation of the maintenance system into practice are included.

Bakgrund & Problemdiskussion: Lean består av en mängd olika verktyg som är skapade för olika ändamål, i syfte att skapa sig konkurrensfördelar gentemot andra företag. Användandet av metoden kan innebära att det blir bättre kommunikation, större tillit eller förbättringar i driftsekonomin. På senare år har det även kommit ett förändrat krav på företagen gällande miljön, vilket gjort att de inte endast kan fokusera på hur de kan förbättra de operativa processerna. Företagen försöker därför kombinera de traditionella prestationsmålen (ex: kvalitet & effektivitet) med miljömål. Här har det visat sig att Lean:s tankesätt även kan användas för att förbättra miljöprestationerna och skaffa sig konkurrensfördelar genom det. Men det är långt ifrån alla företag som implementerat metoden som lyckats att få konkurrensfördelar. Vilket beror på att företagen har bristande kunskaper över vilken påverkan de olika lean-verktygen har. Syfte: Syftet med denna studien är att identifiera vilka lean-verktyg svenska tillverkande företag arbetar med samt hur företagen arbetar med dessa. Vidare avser studien att öka förståelse över vilken uppfattad påverkan företags arbete med lean-verktygen har på driftsekonomin och miljöprestationerna. Metod: Tillvägagångssättet utgår ifrån en komparativ flerfallsstudie med kvalitativ karaktär. Materialet är inhämtat från tre tillverkande företag. Intervjuerna är genomförda genom strukturerade frågor via mail, samt semi-strukturerade frågor via telefon. Den inhämtade datan är sedan analyserad för att finna likheter och skillnader mellan fallföretagen, men även gentemot tidigare forskningen. Slutsats: Utifrån denna studien visar det sig att företagen anpassar sitt användande av de olika lean-verktygen till sin verksamhet. Där användandet av lean-verktygen upplevs påverka att det blir ett större kundfokus i företagen. Arbetet med lean-verktygen upplevs även bidra till att det blivit bättre kvalitet på företagen produkter och processer, samt att flexibiliteten och pålitligheten kunnat förbättras. I denna studien visar det sig även att företag börjar tänka mer på hur deras processer och produkter påverkar miljön. Där arbetandet med lean-verktygen visat sig att företagens miljöprestationer kan förbättras. I denna studien visar det sig att användandet av lean-verktygen bidragit till att materialanvändningen kunnat reducerats. / Background and problem discussion: Lean consists of a variety of tools that have been created for different purposes, in order to create competitive advantages over other companies. The use of the method can mean that they become better communication, greater confidence or improvements in the operating economy. In recent years there has also been a changed demand for companies regarding the environment, which means that they can not focus only on how they can improve the unproductive processes. The companies are therefore trying to combine the traditional performance goals (eg: quality & efficiency) with environmental goals. Here it has been found that Lean's way of thinking can also be used to improve environmental performance and gain competitive advantages through it. But it is far from all companies that have implemented the method that managed to gain competitive advantage. This is because companies have a lack of knowledge about the impact of the various lean tools. Purpose: The purpose of this study is to identify which Lean tools Swedish manufacturing companies work with and how the companies work with them. Furthermore, the study aims to increase understanding of the perceived impact that companies' work with lean tools have on the operating economy and environmental performance. Method: The approach is based on a comparative multi-case study with qualitative character. Where the material is obtained from three manufacturing companies. The interviews were conducted through structured questions via mail, as well as semi-structured questions via telephone interviews. The collected data is then analyzed to find similarities and differences between the fall companies, but also against previous research. Conclusion: Based on this study, it appears that companies are adapting their use of the various lean tools to their business. Where the use of the lean tools is perceived to affect their becoming a greater customer focus in the companies. The work with the lean tools is also perceived to contribute to improving the quality of the companies products and processes, and that flexibility and reliability could be improved. In this study it also turns out that companies are starting to think more about how their processes and products affect the environment. Where working with the lean tools has shown that companies' environmental performance can be improved. In this study, it appears that the use of the lean tools has contributed to the reduction in material use.

In the thesis, a methodology alternative to existing methods of digital systems design with increased dependability implemented into FPGA is presented, new features which can be used in the implementation and testing of these systems are demonstrated. The research is based on the use of FPGA partial dynamic reconfiguration for the design of fault tolerant systems. In these applications, the partial dynamic reconfiguration can be used as a mechanism to correct the fault and recover the system after the fault occurrence. First, the general principles of diagnostics, testing and digital systems dependability are presented including a brief description of FPGA components and their architectures. Next, a survey of currently used methods and techniques used for the design and implementation of fault tolerant systems into FPGA is described, especially the methods used for fault detection and localization, their correction, together with the principles of evaluating fault tolerant systems design quality.  The most important part of the thesis is seen in the description of the design methodology, implementation and testing of fault tolerant systems implemented into FPGAs which uses SRAMs as the configuration memory. First, the methodology of developing and automated checker components design for digital systems and communication protocols is presented. Then, a reference architecture of a dependable system implemented into FPGA is demonstrated including several fault tolerant architectures based on the use of partial dynamic reconfiguration as the mechanism of fault correction and the recovery from it. The principles of controlling the reconfiguration process are described together with the description of the test platform which allows to test and verify the design of fault tolerant systems based on the methodology presented in the thesis. The experimental results and the contribution of the thesis are discussed in the conclusions.