National Repository of Grey Literature 24 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Modal analysis experimental method verification
Pop, Miroslav ; Lošák, Petr (referee) ; Houfek, Martin (advisor)
This diploma thesis deals with the issue of operational modal analysis, which is one of the newer areas of structural dynamics that makes it possible to estimate modal properties of structures directly during their operation. The aim of this work is to create theoretical basis of operational modal analysis, more specifically of Frequeny Domain Decomposition method. Furthermore, apply this method to a selected structure and verify the achieved results using computational modelling and experimental modal analysis. The technique of dividing the experiment to separate measurements using reference sensor was used. Evaluation of the operational modal analysis was performed using self-created function for the MATLAB software and using the commercial PULSE Operational Modal Analysis software. Obtained results were verified by computational modelling and experimental modal analysis.
Analysis of the influence of the material model on the mechanical properties of plastic composite parts
Hudeček, Jan ; Poul, Ondřej (referee) ; Houfek, Martin (advisor)
This master thesis deals with computing of mechanicals properties of parts of headlamps. Parts of headlamps are defined with two different material models, linear material model and material model from Moldflow method. The problem is solved by computational modeling with finite element method using Autodesk Moldflow Insight, Ansys 17.2 and Ansys 18.2 with included Moldsim tool. The outputs are calculations of mechanical properties and comparison of both material models.
Design of docking station for mobile robot
Obšil, Tomáš ; Houfek, Martin (referee) ; Krejsa, Jiří (advisor)
The aim of this diploma thesis is design of docking station for an autonomous mobile robot Breach. The task of docking station is to connect this robotic device to power supply without human intervention in order to charge its batteries. The theoretical part of diploma thesis contains research study about autonomous charging of robots. After that it is assessed suitability of using different types of docking stations and it was chosen optimal solution. The practice part of diploma thesis contains design of docking mechanism, which takes account of inaccurate navigation of robot with deviation of several centimeters. One part of this design deals with connector system, which is dimensioned for long-term transmission of electric current with minimal value of 20 A. At the end of diploma thesis there was created 3D model of the complete docking station including connectors for charging in program called SolidWorks.
Programme for calculation of electric machine shaft deflexion with respect magnetic traction
Blahút, Lukáš ; Houfek, Martin (referee) ; Vlach, Radek (advisor)
Primary aim of work is to develop a computer program for calculating the deflection of the rotors of electrical machines. Introductory section describes the simple deflection and possibilities of calculating it. Further, there is defined magnetic pull and his impact on the calculation of shaft deflection. The theoretical part is completed by a detailed description of the method of transfer matrices. The practical part deals with the creation and description of the program created in C++/CLI. Each part is described in terms of user and programmer. In conclusion, prime example is evaluated by created program and given results of calculation are discussed.
Determination of geometric characteristics of curved beam
Foukal, Jakub ; Houfek, Martin (referee) ; Benešovský, Marek (advisor)
This bachelor thesis focuses on creating a algorithm for determining geometric characteristics of curved beam. In the first part, formulas are taken from technical literature. These formulas are then modified and used for implementation of algorithms. In the following section, there are two algorithms for determining the curvature of a curved beam and comparison between their calculated values. The concluding part focuses on an algorithm for calculating the cross-section characteristics from random image format. The algorithm of cross-section characteristics is analytically verified.
Stress-strain analysis of the bar system
Pop, Miroslav ; Profant, Tomáš (referee) ; Houfek, Martin (advisor)
This bachelor’s thesis deals with the issue of rod systems, which represent a special type of construction widely used in the building and mechanical industry. In the introductory part is presented a theoretical basis and methods of static solution of rod systems are described, then it is described stress of rod systems and are derived relations that were subsequently used for the calculation of the specific example. In the practical part, the thesis deals with the analytical calculation of the planar rod system in shape of a power line pylon, for which the cross-sections of the members are designed and the magnitude of the stresses and deformation displacements are calculated. For the calculation, the general method of joints was used and cross sections were designed with respect to the elastic limit state and the buckling stability limit state. At the end of the work, the results of the analytical calculation were verified with numerical solution in software ANSYS Workbench.
Usage of UAV in geophysical survey – the overview
Hlůšek, Josef ; Houfek, Martin (referee) ; Krejsa, Jiří (advisor)
This bacheor´s thesis elaborates on possibilites of use of unmanned aerial vehicles (UAVs) in geophysical surveys. The thesis introduces a list of methods and sensors used in geophysical surveys, an owerview of commercially available UAVs suitable for such survey followed by analysis of their capabilites.
Construction of equipment for loading the sample on a universal testing machine
Ševčík, Ondřej ; Houfek, Martin (referee) ; Návrat, Tomáš (advisor)
This thesis focusess on the construction of equipment for loading a sample onto a uni-versal testing machine.The designs came from analysing existing designs. The best pro-posal was then designed using SolidWorks. The product was then subjected to a MKP analysis, which examined the behavior of the loaded product together with the procures-braised model sample. Finally, all of the drawings were documented to prepare for pro-duction.
Design and Development of Experimental Device for Testing the TEP Acetabula and Wear Identification using Optical Method
Houfek, Martin ; Kratochvíl, Ctirad (referee) ; Hortel, Milan (referee) ; Hlaváčková, Milada (referee) ; Florian, Zdeněk (advisor)
Today is the implantation of joint replacements, although a radical, but very functional restoration frequent way ill joint. The implants are placed high demands on their biocompatible and long-term function, which is directly related to wear of joint replacements in the human body. Therefore, analysis of the complex behavior of the implant in the human body is a fundamental problem of biomechanics of implants. This issue is dedicated, this dissertation thesis. Dissertation thesis deals with the solution design and development of experimental device for testing the TEP acetabula and wear identification using optical method. The proposed device allows the joint burden hole TEP physiological manner, but by working with the acetabulum burdened by Power resultant joint axis passes through the hole. The physiological loading of articular wells and evaluating the size of the loss of polyethylene is currently intensively addressed. The results of this study may in the near future, serving as information for assessing the conduct of wear prosthetic hip joint in vivo. The work is devoted to solving the problem of the size required to detect the loss of polyethylene for joint replacement arthroplasty: Design and development of experimental equipment for testing the acetabulum of the hip joint arthroplasty. Identify wear using optical methods. Design and development of experimental equipment was made in the system Inventor Professional 2010 at the level of 3D modeling. Great attention was paid to the design fit into the acetabulum TEP testing machines and gripping the acetabulum into an optical device. Management options were tested with combinations of experimental equipment engines. Suggestions were made and then tests for fixing the acetabulum into an optical device. Has the possibility of depth analysis and identification of wear joined with innovative solutions to evaluate the loss of polyethylene acetabulum arthroplasty. Identification of abrasion (loss of polyethylene) joint arthroplasty holes were carried out experimental measurements using an optical holographic interferometry. The comprehensive analysis of the results of experimental measurement of the loss of polyethylene shows that this method can identify both the size but also an area where there is even to small changes in the surface, which depend on the abrasion. One can also say that using this method we are able to affect the will or displacements that affect the size of the loss of polyethylene in joint arthroplasty hole. Despite the number of known and lessons learned arising from the results of solving the problem of design and development of experimental equipment for testing the acetabulum and hip arthroplasty wear identification using optical methods, this work is that the initial study to identify problematics wear of joint replacements. Complete resolution of this issue is beyond the scope of one doctoral thesis.
Analysing of the design of the opening mechanism for the floor hatch
Metelka, Jiří ; Houfek, Martin (referee) ; Fuis, Vladimír (advisor)
In a family house not far from Brno, there is an entryway hole for getting into the space under the floor. The hole is covered by a high weight concrete hatch. For easier manipulation with the hatch an opening mechanism was designed and manufactured. This mechanism had been installed under the hatch and nowadays it works well. This master’s thesis deals with description of main components of the mechanism and their function. Load analysis and stress-strain analysis are the major part of this thesis. At the end of this work the analysis results are commented and some suggestions for further research are proposed.

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