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Design and realization of measuring device for determination of human arm force depending on elbow joint angle.
Zezula, Miroslav ; Vlk, Miloš (referee) ; Krejsa, Jiří (advisor)
The goal of this bachelor’s thesis is design and realization of measuring device for determination of human arm force depending on elbow joint angle. Used measuring method allows to measure this relationship during one continuos movement from one limit position to another. Simplicity of single measurement run allows to obtain a large set of values and evaluate it statistically. This thesis contains a detailed technical description of the measuring device. Actual force and position of hand are measured by electric transducers. Measured values are captured using Spider8 data acquisition system. Based on experiences from first test measurement, the measuring device is modified and drive unit is added. This drive unit is automatically started by a signal from data acquisition system.
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Design of airconditioned chamber for stratospherical baloon
Gedeon, Sebastián ; Spáčil, Tomáš (referee) ; Krejsa, Jiří (advisor)
The aim of this bachelor thesis is design of a heating chamber for a stratospheric balloon. The chamber's role is to preserve the load from the impact of the environment in which the baloon is going to be situated. The process of protection of the load is described in three steps. The first one is to characterize the flight dynamics which consits of the following: elevation time, descending time, maximal height reached, air characteristics changes depending on time. The second step deals with flight energetic balance. The total heat losses or the total heat increase of the chamber in different weather conditions have to be defined resutling from step one. The third step is to design the constructing or functional elements of the heated chamber, so that the chamber could overcome extreme conditions during the flight and to prevent the damage to the load. The energetic balance calculations are presented in the Microsoft Excel document. This document is free to read and can help with scientific construction projects.
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Determination of sound source orientation from multichannel audiosignal
Sumtsov, Artem ; Ripel, Tomáš (referee) ; Krejsa, Jiří (advisor)
The goal of this thesis was a research on appropriate methods of determination of sound source orientation and consequently its processing. This thesis describes subsequently four methonds of determination of signal delays between different channels. Each of these methods is evaluated with respect to suitability, usability, error rate and sensibility. In the next part the geometrical model for determination of the sound source orientation is described. Experimental solutions are processed for the situation with three microphones. Calculations are done in Matlab.
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Sign language detection methods - review
Petr, Luboš ; Venglář, Vojtěch (referee) ; Krejsa, Jiří (advisor)
The Aim of this work is to describe various methods of sign language detection. The output of individual methods is a functional translation of sign language into text in real time. In addition to glove and kinect detection, this work deals with the possibilities of sign language detection from image recording, which is the most prospective method of detection in the future. The thesis is also focused on sign classification using neural networks.
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Industrial TwinCAT based diagnostics application
Zigo, Ľubomír ; Ondroušek, Vít (referee) ; Krejsa, Jiří (advisor)
This bachelor´s thesis describes designing of diagnostics application for press controlled by Beckhoff TwinCAT. Application monitors press regularly and informs staff in case of breakdown. Diagnostics application is created in high-level programming language Visual C++ in Microsoft Visual Studio environment. Application communicates with TwinCAT via .NET Framework library TwinCAT::Ads, which is part of TwinCAT. Breakdown texts are read from database via Microsoft OLE DB interface using SQL.
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Floor detection during elevator ride
Havelka, Martin ; Králík, Jan (referee) ; Krejsa, Jiří (advisor)
This diploma thesis deals with the detection of the current floor during elevator ride. This functionality is necessary for robot to move in multi-floor building. For this task, a fusion of accelerometric data during the ride of the elevator and image data obtained from the information display inside the elevator cabin is used. The research describes the already implemented solutions, data fusion methods and image classification options. Based on this part, suitable approaches for solving the problem were proposed. First, datasets from different types of elevator cabins were obtained. An algorithm for working with data from the accelerometric sensor was developed. A convolutional neural network, which was used to classify image data from displays, was selected and trained. Subsequently, the data fusion method was implemented. The individual parts were tested and evaluated. Based on their evaluation, integration into one functional system was performed. System was successfully verified and tested. Result of detection during the ride in different elevators was 97%.
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Design of conveyor of couplers
Klár, Pavel ; Ripel, Tomáš (referee) ; Krejsa, Jiří (advisor)
This thesis is focused on the design of conveyor of couplers with regard to the requirements for the resolution, and consisting of several parts. The first part outlines the given issue, short research study and an idea of solution. The next part concentrates on the structural design of the whole conveyor. Then the description of the first part of the conveyor including the structural design and the required calculations follow. Finally, other conveyor parts, the budget and the instruction manual are explained. The thesis includes the related drawings and all necessary calculations for other conveyors parts as well.
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Differential chassis mobile robot trajectory planning
Chochel, Michael ; Věchet, Stanislav (referee) ; Krejsa, Jiří (advisor)
This work speaks about a suggestion of trajectory of mobile robot with nonholonomic movement limits and differential chassis while passing through a “T“ shaped crossroad. In the theoretical part some methods generally used to solve this task of planning a trajectory of the robot will be explained. In the practical part this task will be solved by an algorithm for searching the optimal trajectory to pass through the crossroad.
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