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Electronic torque wrench
Juřík, Dominik ; Kubík, Michal (referee) ; Mazůrek, Ivan (advisor)
This bachelor's thesis deals with the construction of a modification for a torque wrench for electronic recording of tightening torque and angle. In practice, the recording of the tightening process is managed using electronic torque wrenches. However, these wrenches are often very expensive, and their use for verifying the reliability of various screw joints would be highly impractical. This is due to the large differences in the required tightening torques for screws of different sizes. This problem has been addressed in this work by constructing an adapter for electronic recording of tightening. The measurement and recording of the tightening torque are enabled by using strain gauges, which are attached to an extension rod. An angular velocity sensor (an electronic gyroscope) is used to determine the tightening angle. Signals from the sensors are transmitted to an analyzer from Dewetron via a connector on this adapter. After initial calibration, this device can be connected via a square drive to any length of wrench without the need for further calibration. Based on the experiment conducted, it can be stated that this device is correctly designed. This device will be used in the Technical Diagnostics Laboratory of the Department of Mechanical Engineering at Brno University of Technology.
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Semi-actively controlled magnetorheological damper of electric motor fork
Blahuta, Jiří ; Vimmr, Jan (referee) ; Kubík, Michal (advisor)
The passive dampers used today, which work by dissipating energy using an oil fill, allow only limited damping force adjustment, which must be set before driving. Passive dampers are at their peak in terms of design and no further advances in ride comfort are expected. This is where magnetorheological dampers have the potential to increase ride comfort and improve handling with semi-active control. They achieve better performance thanks to a rapid change in damping force, which can then be controlled almost instantly according to the current driving conditions. MR dampers are already successfully used in the automotive sector but have not yet made a commercial breakthrough in the cycling segment. The main reason is their high weight compared to current passive dampers. The aim of this work is to design a lightweight and fast MR damper for the fork of a Kuberg electric motorbike. For the success of the product, the weight of the design needs to be minimized. For the proper operation of a semi-active damper, it is necessary to achieve a fast time response of the damping force, which is most affected by the occurrence of eddy currents in the magnetic circuit. Another problem is to achieve sufficient damping force in the activated state, so a suitable prediction model must be used. The design of the damper also needs to be able to fit into the limited space of the fork and the damper must be fitted with sensors. The result of this work is the design of two generations of MR damper and the fabricated working sample. Generation I MR damper was used for testing and verification of the model. Generation II MR damper is then the final design with reduced mass. The weight of the generation II damper is only 19% higher than the original passive damper. The total weight of the MR damper is 1,6 kg. The new MR damper retains the original dimensions and stroke and has integrated sensors in the design. The proposed MR damper has the potential to be successful in the electric bicycle segment and other electric single-track vehicles where its implementation is most advantageous. However, it can also be used in conventional mountain bikes. Together with a semi-active control unit, it allows for better ride comfort and handling characteristics.
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Smart materials application in hydraulic systems
Montag, Jakub ; Klapka, Milan (referee) ; Kubík, Michal (advisor)
This thesis deals with the application of smart materials in hydraulic systems. In the first part, the hydraulic systems themselves and smart materials are described. This is followed by specific smart materials, where the principle of function, in which fields they can be found, applications in hydraulic systems and their advantages and disadvantages are described. Finally, the materials are summarised and compared with each other.
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The study of magnetorheological shaft seal
Pavlíček, Dušan ; Dočkal, Aleš (referee) ; Kubík, Michal (advisor)
This thesis deals with the experimental study of magnetorheological shaft seal. The purpose of this diploma thesis is to describe the operating parameters of rotational magnetoreological shaft seal. In thesis, the effects of magnetic field and shaft speed on the pressure resistance and braking torque are described. Operating parameters were measured by an experimental device. Research has shown that the magnetoreological seal is characterized by a high pressure resistant. Disadvantages are the high braking torque and leakage of carrier oil from the magnetorheological fluid. These problems have been solved by a new design of magnetic circuit, that has been identified as a magnetoreological gradient pinch seal (MRGPS).
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Innovation of chip conveyor for cutting machine
Kočica, Martin ; Kubík, Michal (referee) ; Brandejs, Jan (advisor)
The aim of this project is the design modification of existing outdated chip conveyor for the lathe SPT 32 NC, owned by Slovácké strojírny OJSC factory 1 Strojírny Uherský Brod. The work is divided into acquaintance with the problem of chip conveyor and the requirements that are placed on the conveyor. The thesis summarizes possible design solutions, of which is chosen the best design solution. Followed by calculations dimensions, choice of materials and semifinished products for creating drawings. The primary input for the work is existing conveyor frame. All dimensions and functional members were chosen with regard to the parameters of the conveyor frame, which will be modified at least. The output is a complete drawing documentation and accompanying report.
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Design for waste gas cleaning
Kubík, Michal ; Lisá, Hana (referee) ; Baláš, Marek (advisor)
This diploma thesis deals with impurities in waste gases and syngas. Those gases usually have low heating value and contain impurities which are the main issue of those gas fuels. Waste gases and syngas can replace natural gas after right gas treatment. First part is theoretical. It starts with description of biomass and gasification technology. Then the waste gases are described – their origin and usual composition. Next part is dedicated to impurities and is followed by impurities treatment technologies. For removing of almost every type of impurity wet scrubber can be used which is described in detail in following part. There are other types of gas cleaning technologies, so they are described too but not in such detail as wet scrubber. In second part the wet scrubber is designed, and its function is tested by cleaning syngas from fluidized-bed gasifier called Biofluid. During gas cleaning in wet scrubber the influence of water temperature on efficiency of tar removal is examined.
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Logical Network Games for Android
Kubík, Michal ; Škoda, Petr (referee) ; Kouřil, Jan (advisor)
The main goal of this bachelor's thesis was the implementation of application for playing logical games. This work deals with Android platform and the possibilities of creation and deployment of applications for this platform. The known algorithms that are used for implementation of an artificial intelligence are described in the work. The ways of wireless communication between mobile device are also mentioned. The graphical user interface of application, solution of an artificial inteligence and the network communication are described in the implementation part of this work.
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Magnetorheological shock absorber with short response time for train bogie
Šebesta, Karel ; Špalek, Petr (referee) ; Kubík, Michal (advisor)
The diploma thesis deals with the design of a magnetorheological damper with a short response time of the damping force for the bogie of a rail vehicle. The largest component, which slows down the response, is the eddy currents generated in the piston group of the MR damper. A rapid onset of damping force is achieved by using a shape approach in magnetic circuit design. The shape approach increases the distance that the eddy currents must travel, and therefore it helps to reduce them. The shape approach is realized by grooving the core and the shell of the MR damper. The proposed fast version of the MR damper is measured on a hydraulic pulsator and its results show a sufficient time response of the damping force. This response does not exceed 8 ms for the primary onset of the damping force. The new fast design of the MR damper combines the greatest advantages of the technology and enables to meet new requirements for damping elements in the rolling stock chassis.
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