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The influence of Red Bull energy drink on speed, power and rebound performance of female volleyball players at the performance level
HARRISOVÁ, Helena Estella
The aim of the bachelor's thesis was to find out the influence of Red Bull energy drink on the speed, strength and rebound performance of female volleyball players at the performance level. Fifteen first-league volleyball players of VK Madeta České Budějovice club from the women's category were tested. The performance of female volleyball players was assessed using a bicycle ergometer, rebound board and hand dynamometer in the middle of the 2023/2024 season at the laboratory of load diagnostics at the department of physical education, University of South Bohemia. Each player underwent testing twice with a one-week break. Participants were given a Red Bull energy drink and a placebo in random order. Drinks were blinded. Anaerobic parameters were examined together with the blood lactate concentration using Wingate test, the average height recorded by the Bosc test and the maximum hand grip strength using the hand dynamometer. We did not confirm any significant effect of Red Bull energy drink on the observed performance. The t-test and Cohen's d were used to assess the statistical and substantive significance of the results. No significant effect of Red Bull energy drink on the observed parameters was found, with the exception of the maximum strength of the right-hand grip (d=0,29), the average height of the jump with a bounce from the left leg (d=0,22), maximum heart rate (d=0,29), maximum relative power (d=0,31), fatigue index (d=0,4) and lactate (d=0,2), for which substantive significant influence was recorded with only a small effect. Based on the evidence obtained from the measurements, it was proved that the Red Bull energy drink in a short period of time (20 min) had no effect on the performance of athletes.
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Design of a Robotic End Effector
Hesina, Ondřej ; Kubela, Tomáš (referee) ; Pochylý, Aleš (advisor)
This bachelor’s thesis analyses the possibility of grasping of the object by an industrial robot KUKA KR 16. Gripping object is a plate-shaped cast made from aluminium alloy with inner hole. After analysing the options is selected the most suitable option, designed end effector for bin-picking method and use already have been used grippers in practice.
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Design of lift
Míček, Pavel ; Karásek, David (referee) ; Zvonek, Miroslav (advisor)
This thesis is deals with design of panoramatic glass elevator which is integrated into concet of contemporary architecture. Required purposes is bring in original view of submission to modern glass elevator. I want to use my fancy for something more then only designing shape. Initial point must be some idea, some logical concept. Desing and materials are result of this concept. Shape respect logical though. I want create some view point of interior. Dominant, which grip of beauty, fluent movement, used materials and curves defining own design. I want design interior jewel. Jewel, which respect space and together are complex. Object reflective philosophy and image of firm.
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Online control of SCARA robotic manipulator
Pařík, David ; Jelínek, Aleš (referee) ; Chromý, Adam (advisor)
Bachelor’s thesis deals with Epson SCARA robot. Theoretical part of this project descri- bes parts and functions of manipulator H554BN and its contorller SRC 310. There is also included chapter about the SPEL III robot programming language. Practical part is about putting the robot into operation. It’s focused on the creation of magnetic grip and C# class for controlling robot via PC. The final aim is to demonstrate manipulators abilities in some interesting task.
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Finishing milling of accurate surface
Šimonek, Ondřej ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The aim of this work is to find a suitable cutting tool and suitable cutting conditions for the production of hydrostatic surfaces of a crossmember with the quality of the surface structure of Ra 0.8 mm. The technology described in the thesis deals with finishing hydrostatic surfaces by milling, with the quality of the surface structure of Ra 0.8mm. As the production method cutting operations using CNC machines is used. To assure the quality of the surface insert tools are used, which are selected and evaluated based on experimental testing from six different suppliers. The technological process of production solves the problem of the hydrostatic surface production from the first gripping all the way to the final manufacture of the surfaces.
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Assessment of service conditions of the screw grips of testing machine MTS 810
Votroubek, Tomáš ; Čermák, Jan (referee) ; Náhlík, Luboš (advisor)
This diploma thesis is aimed to assessment of safety of screw grips of testing machine MTS 810. Some parts of grips are predisposed to damage at low temperature (-180°C), e.g. spacer, isolating ceramics lamellas, etc. To guarantee its perfect function under hard laboratory conditions the finite element analysis was performed and suitable modifications grips parts have been suggested with respect to maximum of application of recent parts. Part of the thesis is devoted to suggestion of suitable tightening torque of experimental sample under different temperatures. For necessary numerical computations FEM system Ansys was used.
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Optimization of Control Algorithm of MR Damper
Strecker, Zbyněk ; Kotaba, Ondřej (referee) ; Ondrůšek, Čestmír (referee) ; Šindelář, Martin (referee) ; Mazůrek, Ivan (advisor)
This work deals with the usage of magneto-rheological (MR) damper in the semi-active car suspension. Semi-active suspension can improve ride comfort or tyre grip to the level, which cannot be achieved with the common passive setting of the damper. MR damper has however features, like time response of the controller with MR damper and the control range of the MR damper, which limit area of application. It was found out that especially the time response of the damper significantly influences the efficiency of semi-active algorithms. Current MR dampers with controllers are not capable of efficient control of the semi-active suspension. For proper design of semi-active suspension with MR dampers, the time response must be decreased. Therefore, a new PWM current controller was designed and verified. Also changes in MR damper design which eliminate eddy-currents in the magnetic circuit were proposed. The results of this work should contribute to the better design of semi-active suspension systems with MR damper.
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Grid dip meter with large-diameter measuring coil
Obr, Michal ; Koton, Jaroslav (referee) ; Hanák, Pavel (advisor)
This master’s thesis deals with grid dip meter, its operating principle, characteristics and with measuring procedure. The thesis contains basic division of oscilators, its characteristics and operating principal. The master`s thesis contains complete design of grid dip meter with large-diameter measuring coil which is placed outside the device. Grip dip meter is made of SMD components on a one-sided printed wiring. Grip dip meter consist of transformer itself, that has two secondary windings as a supply for resonance meters and internal digital frequency meter. The device has analog panel gauge and BNC input for extrenal counter.
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End Effectors in Robotics
Hradil, Jan ; Kubela, Tomáš (referee) ; Pochylý, Aleš (advisor)
This bachelor’s thesis provides a summary of end effectors used in industrial robotics. The classification is made from various points of view, but the most important one is according to the industrial application. Regarding previous condition, an analysis of gripper modules is performed. Those units are representatives of the widest application – manipulation. Further on there is shown a possibility of connection between a gripper and a robot in laboratories of Institute of Production Machines, Systems and Robotics and calculation of gripping forces. This thesis contains a summary of the most used industrial robots and manipulators as well.
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