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New Approaches in Numerical Aeroelasticity Applied in Aerodynamic Optimization of Elastic Wing
Navrátil, Jan ; Slavík, Svatomír (referee) ; Komárek,, Martin (referee) ; Hlinka, Jiří (advisor)
Aeroelasticita je nezbytná vědní disciplína zahrnuta do návrhu letounů. Zaměřuje se na předpovídání jevů, které vznikají vlivem interakce aerodynamických, elastických a setrvačných sil. Tyto jevy často vedou ke katastrofickým následkům, proto musí být prokázáno, že nevzniknou v rozsahu rychlostí ohraničujících letovou obálku. Aplikace moderních materiálů při konstrukci draku, spolu se snahou navrhnout aerodynamicky efektivní tvar křídel, vede ke zvyšování poddajnosti letounů. To má za následek změnu aerodynamických vlastností a také k výraznějšímu vliv na aeroelastické jevy, které mohou být vyvolány snadněji vlivem pohybů tuhého tělesa než v případě tužších konstrukcí. Aeroelastické jevy mohou vznikat v širokém rozsahu rychlostí zahrnujícím i transsonickou oblast. V této oblasti je ovlivněna zejména rychlost, při níž dochází k třepetání, a to vlivem nelineárních jevů v proudu. Běžné nástroje, které jsou založeny na lineárních teoriích, nejsou schopny tyto nelineární jevy popsat. Cílem práce je proto navrhnout, implementovat a otestovat nástroj pro výpočetní (numerickou) simulaci aeroelasticity. Nástroj má využívat řešič proudového pole, který je schopen předpovědět nelineární jevy. V práci je kladen důraz na simulaci statické aeroelasticity. V práci jsou popsány metody, které je nutno zahrnout do numerické simulace statické aeroelasticity. Dále je popsán vlastní nástroj a je provedeno zhodnocení konvergence statických aeroelastických výpočtů. Funkčnost nástroje byla ověřena na příkladech, kdy byly použity různé aerodynamické a strukturální modely. Nástroj byl také aplikován při aerodynamické tvarové optimalizaci poddajného křídla. Výsledky optimalizace a její výpočetní náročnost byly porovnány s případem optimalizace tuhého křídla. Na závěr je v práci prezentován příspěvek autora do výzkumu zaměřeného na zhodnocení vlivu časové synchronizace mezi CFD a CSM řešiči. Použitý testovací případ je transsonické obtékání křídla na začátku třepetání (flutteru). Výsledky byly srovnány s experimentálními daty poskytnutými NASA.
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Autonomous mobile robot communication interface design
Bajer, Jan ; Šnajder, Jan (referee) ; Věchet, Stanislav (advisor)
This thesis deals with the design and implementation of a communication interface for an autonomous mobile robot, which is designed for watering plants. The theoretical part is a search for possible ways of communication with the ROS system, which runs on the robot. Subsequently, the possibilities of designing a mobile application for interaction with this robot are explored. In the practical part, a communication interface is designed using the MQTT protocol together with the implementation of this interface into a robot, database server and mobile application, which is created using the Flutter framework. The conclusion of the work discusses the suitability of the communication protocol used and the evaluation of the functionality of the created system.
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Mobile Application for Scheduling Activities at Summer Camps
Holub, Ondřej ; Martiček, Štefan (referee) ; Češka, Milan (advisor)
The main goal of this thesis is to design and implement a mobile application assisting in scheduling activities at summer camps taking into account the preferences of camp participants. This is done in a way that ensures the minimization of conflicts with respect to user-defined constraints. QR code scanning is used as an effective method of data input. The main process of finding an optimal solution is formalized as a graph colouring problem and is implemented using the branch and bound method. The created system does not require any other device for its functioning, all the necessary calculations are being executed on a mobile phone of the user. This system has significantly accelerated and simplified the process of scheduling activities at summer camps.
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Diagnosis of Ventricular Tachycardias from Electrocardiogram
Šrutová, Martina ; Hrubeš, Jan (referee) ; Kolářová, Jana (advisor)
The aim of this thesis is a diagnosis of ventricular tachycardias, fibrillations and flutters from electrocardiogram. These disturbances of heart rate are ranked among the life threatening arrhytmias. This work presents own method of the automatic detection, which is created for the ECG holter monitoring system. The proposed algorithm is based on the detection in the spectral domain, which is supported by the detection in the time domain. The results show the discrimination of arrhytmias from the normal sinus rhythm and the discrimination from the noise. The method is tested with ECG records from the The AHA Database (American Heart Association) and from The MIT-BIH Malignant Ventricular Arrhythmia Database.
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Creation of Bluetooth data logger for recording and processing of measured data
Vaverka, Jan ; Myška, Vojtěch (referee) ; Dejdar, Petr (advisor)
The first part of the theses deals with dataloggers and their use in today's world. The second part is dedicated to microcontrollers which are used as a control unit for dataloggers. Individual peripheral devices MCU and their communication interfaces have been described. The next part deals with Bluetooth Low Energy which is used for data broadcasting to the user. Based on the acquired knowledge the microcontroller and sensors were selected. A datalogger was constructed and programmed from selected components, which will measure the properties of ferment during fruit fermentation. Finally, a mobile application was created to download data from the datalogger and then display the data in charts.
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VUT 081 Kondor aircraft aeroelastic analysis
Talanda, Tomáš ; Šplíchal, Jan (referee) ; Juračka, Jaroslav (advisor)
This master thesis deals with VUT~081~Kondor aircraft flutter analysis. This aircraft is being designed at the Institute of Aerospace Engineering, Faculty of Mechanical Engineering, Brno University of Technology. The thesis contains detailed aircraft description, natural frequency and normal modes computation as well as aircraft structure flutter analysis and critical flutter velocity determination. Some structure improvement recommendations have been given in order to increase the critical flutter velocity and to fulfil the CS-VLA regulation requirements.
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Smartphone application for optical fiber monitoring system
Vaverka, Jan ; Myška, Vojtěch (referee) ; Dejdar, Petr (advisor)
The main goal of this master thesis is to develop a multi-platform mobile application in the Flutter framework for iOS and Adnroid platforms. The application will remotely communicate with a fiber optic monitoring system through a server. In the introduction of the thesis, the issues of fiber optics and fiber optic security options are described. The next section describes the communication options between the application and the server, also the Flutter framework is described. In the practical part, the communication between the application and the server is proposed. A large part of the practical section is focused on the design and programming of the multiplatform application. The last part is focused on testing the communication between the application and the server.
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Investigation of Transonic Flow through Linear Cascade with Single Blade Incidence Angle Offset
Fürst, J. ; Musil, Josef ; Šimurda, David
The contribution deals with numerical and experimental investigation of the effect of incidence angle offset in a two-dimensional section of a flat linear blade cascade in a high-speed wind tunnel. The aim of the work is to complement ongoing research of quasi-stationary approximation of aerodynamic flutter by examination of setups leading to transonic flow regimes. The numerical simulations were realized by finite-volume, in-house code developed on top of the open-source software package OpenFOAM. The experiments were conducted in correspondence with the setting of numerical simulations. The comparison of experimental and numerical data is presented on the isentropic Mach number distributions at various locations in the blade cascade. The description of transonic flow structures in the vicinity of blades is also provided.
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Mobile Application for Management of Smart City Service Requests
Formánková, Klára ; Burget, Radek (referee) ; Hynek, Jiří (advisor)
The aim of this thesis is to develop a mobile application for managing service requests in smart cities and it is done in collaboration with Logimic company. Service requests represent activities that need to be performed in a city, where managers are responsible for managing them and technicians are responsible for executing them. This thesis intends to analyze the current state of support for service request management on a smart city platform and to design and implement a solution for effective service request management in the form of a mobile application for both Android and iOS platforms. The result of the work is a multiplatform application developed using Ionic and Capacitor frameworks, which allows more efficient work with service requests by organizing them into a graph structure, merging duplicate requests and introducing some typical mobile elements. The resulting application is also integrated as a module of the smart city platform. An important contribution of this thesis is the verification that using frameworks Ionic and Capacitor, a web application can be easily transformed into a multiplatform one.
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