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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
231

Principy údržby metodou TPM / Principles of maintenance of the TPM method

Zahradníček, Lukáš January 2018 (has links)
This master thesis concerns modern method of TPM used in the production companies for maintenance of machinery. In the theoretical part, general maintenance is first described, as well as the TPM method. There is also described the technical diagnostics, which was emphasized in the practical part in terms of the use of vibrodiagnostics in predictive maintenance. In the practical part there is presented the proposal for introduction of the TPM method at the SMC Industrial Automation s.r.o. in Vyškov.
232

Poloautomatická diagnostika síťových protokolů / Network Protocols Semiautomatic Diagnostics

Svoboda, Ondřej January 2018 (has links)
This thesis is about semiautomatic network protocol diagnostics and creating protocol description from eavesdropped communication. Several network eavesdropping techniques  and some common programs for network analysis are introduced. Well-known network protocols are described, with focus on their communication messages. Some already existing methods for creating models from examples are mentioned and their characteristics defined. Next we design architecture of developed tool and some methods, that create protocol description. After that we explain implementation of this tool and finally the tool is tested and experimented with.
233

Selektivní pájení / Selective Soldering

Stoklásek, Lukáš January 2019 (has links)
This diploma thesis introduces the problematics of selective soldering. The theoretical part deals with description of soldering process and its possibilitites, use of this processes for selective soldering and the control of production. The practical part describes the methodics of measuring the amount and uniformity of flux applied on printed circuit boards, effects and stability of preheaters and dwell time if PCB in the soldering wave. The next part deals with the production test for the certain product, cleanness of the single processes, x-ray diagnostics and cross section of the boards. In the end is economic evaluation of the processes. The main object of this thesis is to suggest the optimal production process for the product.
234

Diagnostika stavu malých kuličkových ložisek / Condition monitoring of small ball bearings

Šváb, Štěpán January 2019 (has links)
The aim of this thesis was to build equipment for testing bearing condition analysis during its life. The theory of bearing parameter and diagnostics methodology for their analysis are discussed. Hardware used for device design and data collection. Finally, the course of measurement and software evaluating the end of the test are discussed.
235

Návrh provozních mezí pro diagnostický systém obráběcího stroje / Design of operational limits for machine tool diagnostic system

Hrbáček, Vlastimil January 2020 (has links)
The Master's thesis deals with online vibration diagnostics of a milling center. It contains a methodology to determine the vibration operating limits and to detect machine of condition monitoring. The thesis also contains a general description of maintenance and technical diagnostics with a focus on vibrodiagnostics. The main part of the thesis is to solve the problem of determining the operating limits of spindle vibration depending on the production program. The essence of the solution is to determine vibration limits for individual milling tools.
236

Vzdálená diagnostika spalovacího motoru v reálném čase / Remote diagnostics of the combustion engine in real time

Jobánek, Vojtěch January 2020 (has links)
There is a current trend of constantly increasing emphasis on the cost-effective operation of vehicles in freight and passenger transportation. One of the efforts is to reduce the unproductive time of the driver and the vehicle which is spent on maintenance and repairs. The unproductive time can be significantly minimized by well-timed and faultless diagnostics that is, ideally, without need for a service visit. Real-time remote diagnostics, including an application that evaluates the current state of the vehicle, is a modern tool for efficient use of the vehicle.
237

Diagnostický systém papírenského stroje / Diagnostic system of paper machine

Škrobánek, Martin January 2020 (has links)
This master thesis deals with the technical diagnostics, focusing mainly on vibration diagnostics. This problematice is described in the first part of this work on a theoretical level. The next part describes the paper machine, diagnostic system and the measuring points are classified into databases. The practical part of this work consists of a proposal for the methodology of vibration diagnostics for a paper machine, the procedure for measuring and evaluating the measured values. Part of the work is also a practical example of the measurement of the central cylinder, on which the procedure is tested, and the compilation of new limit values.
238

Návrh diagnostiky obráběcího procesu / Design of machining process diagnostic system

Wolf, Jonatan January 2020 (has links)
The master’s thesis is focused on online diagnostics of the machining process. In the theoretical part are presented maintenance possibilities of machine tools. A whole chapter is devoted to vibrodiagnostics, which describes vibration sensors, their attachment to the measured object and methods of vibration signal processing. The practical part lies in creating a software diagnostic solution for chosen PLC and sensors. The functionality of the proposed system was verified during experimental machining, which also provided valuable data for the correct setting of the system.
239

Diagnostika stavu tlumiče za jízdy vozidla / On-road Diagnostic of Vehicle Damper

Vaněk, Vojtěch January 2021 (has links)
The diploma thesis deals with the analysis of the effects of shock absorber wear on the driving dynamics of the vehicle. Furthermore, a quarter model of the car was created in the Simulink software, where a procedure for evaluating the condition of the shock absorber while driving the vehicle was created. This procedure was subsequently validated on real measured data from the Hummer H3 car.
240

Využití signálů elektromagnetické a akustické emise pro lokalizaci trhlin vznikajících při mechanickém zatěžování pevných látek / Application of electromagnetic and acoustic emission signals for localization of cracks generated during mechanical stressing of solids

Burděj, Václav January 2008 (has links)
Terms of acoustic emission (AE) and electromagnetic emission (EME) designated physical effects and also as diagnostic methods based on these effects. These effects are caused by generated cracks in materials that rank among non-destructive techniques of material diagnostics. The advantage of them is that they do not affect the measured object and give us information about the current dynamic state of a tested material. One disadvantage of these effects is that they provide very low energy of signal emissions and make it difficult for broader usage. It is expected better localization of cracks in non-conductive materials by connecting of these two techniques (diagnostics). There are designed and described new methods for crack detection with usage of AE and EME signals in this work. Also there is description of measuring arrangement intended of crack detection and experimental sample for checking accuracy of methods for crack detection. There was performed comparison of accuracy of methods in crack detection.

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