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Thermal analysis of synchronous machine
Bartoň, Petr ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
The master’s thesis deals with analysis of warming and cooling of synchronous machine. The warming is caused by the machine’s losses resulting from the conversion of electrical energy into mechanical energy. There then can be achieved high values of temperature on the machine, which can lead to destruction of the machine. The transient thermal analysis, working on the finite element program Ansys Workbench, is used for thermal analysis. As an appropriate instrument, which serves for flow calculation, a module CFX in the program Ansys Workbench may be used. In the practical part the model for unhampered alternator with current in the field winding only was measured and after that, the measured values were compared with the results of transient thermal analysis. Speed and progress of air flow through machine were analyzed with CFX module.
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Analysis of thermal properties of the synchronous machine
Paszek, Michal ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
In this Master´s thesis will be performed an analysis of thermal properties of synchronous machines in the program Ansys Workbench on a simplified model of synchronous traction motor. In the first section will be performed thermal analysis without cooling followed by analysis of air flow and finally thermal analysis with cooling for fan speed 1500 min-1 and 3000 min-1. The second section will describe the principle, construction and losses on the synchronous machine. The third chapter will describe concepts such as heat, temperature, heat transfer, types of the heat transfer, specific heat capacity, emisivity and thermal conductivity. The fourth chapter will introduce the program Ansys Workbench, finite element method and Ansys CFX. In the fifth chapter will be described how to perform thermal analysis on the created model of motor. The sixth chapter will describe how to analyze the air flow of the created model of motor. The flow analysis will be performed for fan speed 1500 min-1 and 3000 min-1. In the seventh chapter will be compared the results of the air flow and pressure field in the motor model. In the eighth chapter will be performed a thermal analyzis on the created motor model with cooling for fan speed 1500 min-1 and 3000 min-1. The nineth chapter will compare the results of temperatures and heat fluxes obtained from the thermal analysis witnout cooling, with cooling for fan speed 1500 min-1 and 3000 min-1 for full losses, half losses of continous running, and full losses of interrupt running for 9000 seconds (2 hours 30 minutes).
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Stress analysis in parametric FEM programs
Martinec, Roman ; Vlach, Radek (referee) ; Krejčí, Petr (advisor)
The bachelor thesis focuses on familiarizing with Autodesk Inventor Professional 2012 program and ANSYS Workbench program. It was necessary to get familiarized with working environment of these programs and their mutual cooperation. The interconnection between the two programs is described on a demonstrative case. Next article of the thesis deals with a model conversion into MKP software which was described in detail within both programs. The final part of the thesis compares the results of a stress analysis within Autodesk Inventor Professional 2012 program and also within ANSYS Workbench.
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The new modelling facilities at parametric CAD programme
Sedláčková, Petra ; Janda, Marcel (referee) ; Kuchyňková, Hana (advisor)
This bachelor’s thesis describes Autodesk Inventor Professional 2008 and Ansys Workbench. The main aim is familiarization with user interface and working routine in these programs and their cooperation. In part about Autodesk Inventor there is summarized the advantage of parametric modeling against traditional techniques. Also there is described Inventor studio, in which is created an animation of model created in Autodesk Inventor. In the concrete it is animation of model of one phase asynchronous motor with outer rotor. In Ansys Workbench 11.0 there is created transient thermal analysis of one phase asynchronous motor. The aim of this analysis is to try the work in Ansys Workbench from importation of model, from external CAD system, to evaluation of results.
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Design of tester of piezoelectric PVDF layers
Sijková, Simona ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
The diploma thesis deals with a design of a tester device, a selection and verification of a suitable method for comparing the piezoelectric properties of tested PVDF samples. In the introduction, a basic overview of the theory is important to understand the issue and the various branches of use of PVDF in the field of energy harvesting. The tester device includes a unimorph piezoelectric cantilever beam with tip mass, whose properties are described by three models: a model with N degrees of freedom reduced to one degree of freedom (NDOF), a single degree of freedom model (SDOF), both created in Matlab and a model for verifying results in FEM ANSYS Workbench program. The voltage time response and the voltage frequency response of the models is compared with each other. For two different PVDF samples, the voltage response to harmonic excitation is measured using a tester device, and the piezoelectric properties of one of them are determined using the NDOF and SDOF models.
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Prediction of resistivity for thick film rezistor
Kolařík, Jaroslav ; Otáhal, Alexandr (referee) ; Skácel, Josef (advisor)
This work deals with issue the thick-film technology. Especially this work focuses on trimming value of resistance thick-film resistors. First part is dedicated to create the thick-film and thick-film resistors, trim technology and trim cuts. Next part is design of thick-film resistor and test substrate with resistors. The following is a description of the production the test substrate. Next part thesis deals with practical creation cuts into thick-film resistors by AUREL ALS300. The following is an experimental part dealing with the simulation of thick-film resistor with different trim cuts in the ANSYS Workbench. The last part is for practical verification of simulations measurement by the FLIR SC660 thermovision camera. At the end are evaluated knowledge of the properties of the trim cuts.
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Napjatostně deformační analýza silničního mostu přes řeku Orlici
Adamec, Tomáš ; Hájek, Petr (referee) ; Fuis, Vladimír (advisor)
The main topic of this thesis is stress and strain analysis of road bridge over the river Orlice in Třebechovice pod Orebem. First point of the thesis is theoretical introduction to trusses and solid mechanics. Second point is describing the geometry of the bridge. Third point is creation of a 2D truss model, load of the model and description of computational algorithm. Fourth part is calculation and interpretation of results. Fifth point is verification of the fourth part. Sixth point is description of 3D truss calculation.
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