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Modelling of mechatronic system with flexible parts
Kšica, Filip ; Vetiška, Jan (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with the simulation modelling of mechatronic system with flexible parts using ADAMS and Matlab/Simulink. The beginning of thesis is dedicated to the summary of available methods of modelling mechatronic systems with flexible parts. Next chapters describe different approaches of modelling flexible parts using analytical and numerical methods. In the following step, model of particular mechatronic system is created. System itself consists of a flexible beam part, electromagnetic vibration exciter and vibration power generator. Each part of the system is created separately in variety of programmes, including FEMM, ADAMS and Matlab/Simulink. At the end of this thesis, co-simulation of ADAMS and Matlab/Simulink is used to describe behavior of the complete system, especially energy conversion efficiency of vibration power generator and its impact on the system.
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Response analysis of train track laboratory model
Heteš, Marek ; Věchet, Stanislav (referee) ; Kšica, Filip (advisor)
In terms of safety, railway tracks have to be kept in good condition. Early and accurate detection of track defects can save both time and money. This thesis deals with simulation of a passing train on laboratory apparatus, and the measurement of the generated response. Apparatus represents scaled down section of a railway track, and allows the simulation of defect formation. With the help of the obtained data, a suitable method for defect detection was created.
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Models of Dynamics and Responses of Multi-body Systems
Kšica, Filip ; Houfek, Lubomír (referee) ; Hadaš, Zdeněk (advisor)
The aim of this diploma thesis is to evaluate the potential of available methods for simplification and reduction of complex models of technical systems and their integration with experimental models. Finding methods, which would allow us to create models and run simulations in shorter periods of time, is key in design process of modern technical systems. In the beginning of this thesis, a theory necessary for understanding and application of presented methods is given. These methods can be separated into two groups, first as experiment related, second as simulation related. The first group contains methods for experimental evaluation of response and its use for dynamic system identification. The second group contains methods of finite element model creation, with the usage of standard structural elements as well as Component Mode Synthesis substructures, and these models are in the following step reduced into state space models. In the next step, all presented methods are applied on simple experimental structure. In conclusion, the results of simulations are the subject for comparison not only from quantitative point of view, but also, for the purpose of practical application, in terms of time, feasibility, versatility and accuracy. The system identification method along with state space method proved to be very suitable. The results presented in this thesis might help, by selecting the appropriate method, in simpler evaluation of dynamic properties of technical structures.
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Processing of big data from measurements and simulations of dynamic systems
Ďuriš, Anton ; Musil, Filip (referee) ; Kšica, Filip (advisor)
This thesis is focused on Big data processing from modern technical devices. Big data processing is a time-consuming and complex process requiring powerful hardware, however, there are some methods which enable Big data processing even on a personal computer. In the theoretical part of this thesis, available methods and functions for Big data processing, which are integrated within software and programming languages, are summarized. We focus on TDMS file format, its features and opening options in software and programming languages and their comparison. Then, data preprocessing methods accelerating processing and analysis are listed. In the practical part of this thesis, a graphical user interface in Matlab environment for TDMS file format processing with implemented data preprocessing methods is created. The aim of this thesis is to make processing with this file format more efficient by using a personal computer.
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Model of composite cantilever with piezoelectric layer
Hons, Richard ; Kšica, Filip (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with the generating electrical energy from vibrations from piezoelectric composite cantilever beam. A review of the piezoelectric materials is made. Then the analytical model of piezoelectric cantilever beam is presented, then the influence of parameters is inves-tigated. Case study with theoretic design of parameters on the specific source of vibration is also provided. Last part is the extension of model for the variable width of layers at cantilever
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Design of load mechanism for laboratory model of rail track
Čech, Vít ; Lošák, Petr (referee) ; Kšica, Filip (advisor)
This bachelor thesis deals with the design of the loading of the similarity model of the track and the subsequent implementation and verification of the functionality of the designed device. The thesis is divided into three parts. In the first part of the thesis, the theoretical knowledge related to the effects acting on the track and a research of available methods and equipment that allow the investigation of the individual effects in a controlled laboratory environment are presented. The second part then focuses on the design and construction of the loading mechanism. This had to be designed in accordance with all the loading requirements of the model. The last part covers the testing of the designed loading mechanism and the results are compared with those from a real railway line and also with those measured during the original loading of the model using pneumatic pistons.
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Analysis of tuned mass damper
Jurečka, Martin ; Rubeš, Ondřej (referee) ; Kšica, Filip (advisor)
Complex mechanical structures are often exposed to external influences that can cause excessive vibrations, which can limit their ability to perform their function or affect operational safety. Tuned mass dampers, which are focus of this thesis are very often used to avoid such vibrations. The firts part of the thesis is focused on the research of the principle of tuned mass damper and its use in engineering practice. In the secound part obtained knowlage is used to create a mathematical model of the selected mechanical system and then to implement a suitably designed tuned mass damper to damp unwanted vibrations. Part of the work i also to build a real model of the tuned mass damper, which will demonstrate its function.
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Vibration analysis of single-engine aircraft
Loucký, Tomáš ; Hadaš, Zdeněk (referee) ; Kšica, Filip (advisor)
This bachelor’s thesis deals with the measurement and processing of data from a small single-engine aircraft, followed by analysis and evaluation regarding the overall structural load of the aircraft. The first part provides basic information about vibrations in general and their impact on an aircraft. It also focuses on methods and devices used for vibration measurement. The subsequent chapter describes the procedures of data processing in time, frequency, and time-frequency domains, as well as providing basics about statistical correlation and hypothesis testing. The next section of this thesis will work with the collected data from a test flight, utilizing the previously acquired knowledge to adjust and process all available signals. The goal will be to identify statistical correlations between sensor responses and aircraft maneuvers. Finally, conclusions will be drawn from the results regarding the applicability of sensors for determining the structural load during flight.
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Design of shaped springs for mechanical resonators
Ševčík, Jakub ; Kšica, Filip (referee) ; Hadaš, Zdeněk (advisor)
This bachelor's thesis deals with the design of a structural flexible member for mechanical resonators. Such designed member could find application as part of a vibration generator system. Vibration generators are used to power sensors where it is not easy to supply electrical energy, especially in railway transportation, specifically in monitoring the condition of tracks. This thesis provides an overview of current constructions of vibration generators, drawing inspiration for the subsequent design of the flexible component of the mechanical resonator. Subsequently, a suitable construction is created to ensure proper functioning of the resonator at frequencies ranging from 15 to 50 Hz. The design takes into account the manufacturing process using laser cutting and 3D printing. Two versions are created, where the first is suitable for laser cutting, and the second is suitable for 3D printing. The designed flexible components are then kinematically excited, and their maximum deflection at the resonant frequency is determined using the Ansys and Simulink software. Lastly, a spring suitable for 3D printing is manufactured. Its maximum deflection and the maximum generated power are determined. At an acceleration of 1 m/s2, the system achieves a deflection of 0.5 mm, and the generated power in this case is 0.035 mW. With increasing acceleration, the pover values can reach up to 0.8 mW.
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Analysis of spontaneous synchronization of coupled mechanical oscillators
Nečesal, Filip ; Hadaš, Zdeněk (referee) ; Kšica, Filip (advisor)
The work explains and describes the behavior of synchronization of two mechanical oscillators. This phenomenon is demonstrated on a physical model and compared with a computational model in several experiments. My motivation was that it is a fascinating phenomenon, and the problem is close to me because of the field I study. It was based on the knowledge gained during my previous studies. The first part of the bachelor thesis deals with the research on the synchronization of mechanical oscillators, the mathematical expression of individual types of oscillations, and their properties. The second part consists of a physic model of two pendulums on one base plate and a measurement of the system. The third part of the thesis contains a mathematical model, which was compared with the physical model in last part of the work.
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