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Design and production of pendulum tuned mass damper
Čupr, Michal ; Rubeš, Ondřej (referee) ; Kšica, Filip (advisor)
In a real environment, various external conditions can cause vibration of the machines, buildings or other systems. To prevent vibration of the system with low frequencies, pendulum tuned mass damper can be installed. The first part of this thesis describes the oscillation of simple structures for systems with one or two degrees of freedom. This analysis is then applied to mechanism that contains pendulum tuned mass damper. The damper’s principle is explained along with its important parameters and properties. Design and tuning of the damper are explained. Text continues with description of several types of the damper and there are mentioned some examples of their applications. In the final part, a model of the mechanism with pendulum tuned mass damper is designed and it is described mathematically using programs Matlab and Ansys. Subsequently, the model was made and the real model was compared with mathematical model. It was found that effectiveness of the damper depends most on the natural frequency of the system and the dissipation energy from it. The manufactured pendulum damper effectively dampens the oscillation of the real model, and the course of its oscillations corresponds to the mathematical model.
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Design and implementation of device for dynamic loading of laboratory model of rail track based on pre-stressed stiffness
Turza, Šimon ; Lošák, Petr (referee) ; Kšica, Filip (advisor)
This bachelor thesis deals with the design, implementation, and validation of a loading fixture based on the principle of pre-stressed stiffness for a railway track model. The literature review summarizes the available methods for dynamic modeling of railway tracks and describes the laboratory model used. Furthermore, the thesis addresses the design and implementation of the fixture, which was developed based on the requirements arising from the shortcomings of previous solutions. The final part focuses on the experimental validation of the fixture's functionality and its comparison with previous solutions.
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Vibration measurement processing for predictive maintenance of mechanical systems
Kuchař, Matěj ; Dobossy, Barnabás (referee) ; Kšica, Filip (advisor)
As technology evolves, so does maintenance. In recent years, predictive maintenance has developed the most and is increasingly used. In the case of vibrations in particular, this type of maintenance brings better results than the types of maintenance previously used. Compared to other types of maintenance, predictive maintenance is more difficult to implement. When implementing it is necessary to follow its procedure: data pre-processing, feature extraction, determination of the health indicator, training of the predictive model, and evaluation.There are many software programs that provide features for predictive maintenance. In this thesis, the Predictive Maintenance Toolbox from the Matlab was used. Subsequently, the knowledge of the implementation of predictive maintenance was applied to the experimental data obtained by measuring bearing vibrations to predict RUL.
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Application of MyRIO as wireless sensor node
Navrátil, Patrik ; Chalupa, Jan (referee) ; Kšica, Filip (advisor)
This thesis describes a design of a client application for NI myRIO and a server application for PC. Applications are developed in a LabVIEW environment. Client application is responsible for measuring data from integrated accelerometer and a sensor connected to an AD input and sending it to the server application. The applications are tested with a piezocomposite sensor on an elementary dynamic system.
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Measurement and signal processing with myRio kit
Heteš, Marek ; Spáčil, Tomáš (referee) ; Kšica, Filip (advisor)
This thesis deals with research of options for data acquisition and signal analysis, of the myRIO kit and LabVIEW platform. Next it describes the design of application for data acquisition and signal analysis, and the last chapter of this thesis is about testing and a practical demonstration of our application.
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Oscillation model of train track
Kosorín, Michal ; Kšica, Filip (referee) ; Hadaš, Zdeněk (advisor)
This bachelor thesis deals with dynamic models of rail track vibration. The thesis presents an overview of the historical development of these models. Specific models of vibration are created and deflections are calculated. The force from the passing train is expressed in terms of time in order, to refine the results of the rail deflections. At last, the force effect of the wheels of the train on the rail is described.
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Monitoring of dynamic systems with piezoelectric sensors
Svoboda, Lukáš ; Hadaš, Zdeněk (referee) ; Kšica, Filip (advisor)
The aim of this diploma thesis is to describe localization and calculation load identification of dynamic systems using piezoelectric sensors. Finding methods, which would allow us to evaluate loads on simple systems is the key to their application in the structural health monitoring of more complex systems. A theory necessary for understanding and application in aerospace, civil engineering, automobile industry, and train traffic of presented methods is given in the first part of the thesis. In these applications, the methods of wave propagation and different types of neural network methods are used to evaluate load identification. It is possible to evaluate loads by using a time reverse method, a method based on signal deconvolution, and a method based on a voltage amplitude ratio of the piezoelectric sensor. In the next part, the methods are described, the suitable place for gluing of a sensor, and the number of sensors for using method is given. These methods were verified and compared to a simple experimental system. In the following part, the model of the piezoelectric sensor is presented. It is possible to use the model for calculating voltage output from the strain. For methods verification, the problem of train passage in a specific place of the railway is chosen. The speed of the train and its load on the railway was calculated by using these methods.
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Design of an experimental system with excitation by imbalance
Demura, Dominik ; Kšica, Filip (referee) ; Rubeš, Ondřej (advisor)
The topic of this diploma thesis is the design and construction of an experimental system driven by imbalance. The main part of the work was to design the structure to meet certain requirements. The most important part of the structure is the beam. The mounting method and beam dimensions were calculated numerically and verified analytically using FEM. The rest of the structure was adapted to the dimensions of the beam. The next part of the work consists of the correct choice of vibration motor and its control. At the end of the work, the whole experimental system was manufactured and tested. We measure the vibrations using an accelerometer and then process the data into graphs.
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