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Analytical Methods in Motorsport
Růžička, Bronislav ; Dočkal, Aleš (referee) ; Čejka, Václav (referee) ; Karpíšek, Zdeněk (referee) ; Mazůrek, Ivan (advisor)
This dissertation is focused on proposal for simplified data analyze approach for sport-car vehicle dynamic evaluation with relationship to possibility for qualified estimation of set-up parameters influence for overall vehicle performance. In common practice can be usual overlapping effect caused by concurrent changes of car setup elements if performed in the same moment with resulting in not correct or hardly definable process determination for evaluation and decision about next steps in car development. For analyze of these multidimensional data is then chosen process with approach by Linear Regression Model (LRM). In dissertation is proposed basic philosophy with concern on specificity of car vehicle dynamics, performed experiment with defined inputs including analyze and interpretation method of obtained outputs. This methodic take into account also possibility for general application of multidimensional data analyses not only in motorsport, but as well for dynamic behavior diagnostics of technical systems where finding of optimal running condition depends on multi-parametric setup whose combination must reflect often changes of outer conditions too.
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Road simulator Dyno Tec
Pekar, Marek ; Růžička, Bronislav (referee) ; Mazůrek, Ivan (advisor)
This Bachelor thesis is concerned about reconstruction of road simulators, which is located in Institute of Machine and Industrial Design. At the beginning of this thesis I was interested in overview of current road simulators and undercarriage testers. In the second section I engaged in current state of simulators and I paid attention to various proposals of cover construction and reinforcing of a drum carriage frame. In the next section I have stated a solution for the ideal option of cover construction and a cart attachment. In the conclusion of my bachelor thesis I have compared calculated and experimental values of drum carriage frame frequency. I have also compared the frequency before and after reinforcing of carriage frame of the drum.
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Automation of optical measuring via TRITOP optical coordinate system
Koutecký, Tomáš ; Růžička, Bronislav (referee) ; Volek, Aleš (advisor)
The goal of this diploma thesis is to automate photogrammetric measuring system TRITOP. In the literature retrieval part there is a review of digitizing methods and its description. Further it contains a description of the photogrammetric system TRITOP role. The practical part of the thesis deals with methodology of the TRITOP measurement and evaluation process automation. Automation is then verified on a practical example.
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Design of 1/4 car model for damper testing
Jaroš, Petr ; Růžička, Bronislav (referee) ; Roupec, Jakub (advisor)
This thesis deals by the design of 1/4 car model for testing vehicle dampers, which can be used to simulate the real suspension of a vehicle wheel (up to a maximum car weight of 1,970 kg) and the so-called linear wheel suspension. A linear mathematical 1/4 car model with 2 DOF (Degrees Of Freedom) and data from literature search are used to design and derive the basic parameters of the device. The thesis contains a description of the linear mathematical model and its outputs (acceleration of the sprung mass and forces acting on the sprung mass), description of designed device, descriptions of created simulations (static, modal and harmonic analysis in ANSYS Workbench 2020 R2) and conceptual design of the modifications this device for another possible use for testing of bicycles.
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Design of fast magnetorheological damper piston group using selective laser melting technology
Vítek, Petr ; Růžička, Bronislav (referee) ; Strecker, Zbyněk (advisor)
The diploma thesis deals with the development of the magnetic circuit of Magnetoreological (MR) dampers with a short time response. To achieve a short response time, a shape approach was chosen whereby the geometry of the magnetic circuit was chosen to significantly eliminate the occurrence of eddy currents. The influence of structures on magnetic properties was first examined on a simpler toroidal core and then the optimization was subjected to the magnetic circuit of the MR damper itself. Geometry optimization was done using FEM simulations. The resulting geometry was made of pure iron using Selective Laser Melting technology (SLM). In addition, a MR damper was completed and its properties on air and with MR fluid were measured, which were then compared with previously developed rapid MR dampers. It has been found that the newly designed magnetic circuit achieves similar time responses as all other compared fast MR dampers and reaches a higher dynamic range than most of the compared variants. The proposed magnetic circuit also has a significantly reduced weight.
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Optimization of the existing construction of magnetorheological clutch
Bedřich, Miroslav ; Růžička, Bronislav (referee) ; Roupec, Jakub (advisor)
This work deals with the reconstruction of magnetorheological (MR) clutch. The extensive research on the use of magnetorheological technology in practice was developed in the first part. The function of MR dampers, MR brakes and MR clutches were described. Some parameters of MR clutches were listed and compared. The second part concentrates on construction modifications to improve some parameters of MR clutch. The experiments verifying improvement of operating parameters of MR clutch were carried out in the third part.
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Dynamically balanced resonance adhesive tester
Jandásek, Martin ; Růžička, Bronislav (referee) ; Mazůrek, Ivan (advisor)
This diploma thesis is dedicated to the development of mobile resonance-adhesion tester TriTec. The aim of this thesis is to improve the parameters of the tester in comparison to the previous version of tester, especially to minimize the vibrations of the tester while running without load, and to the make long-distance transportation of tester easier. The first part of thesis was aimed on history of development of TriTec tester, causes of it´s problems and on analysis of vibration minimization possibilities. As a best solution is considered a rotational balance mechanism, which was designed in next part of thesis. After that a new front wheel drive and an user interface conception were designed. The modified tester reaches all the deserved parameters and is able to compete static resonance-adhesion testers by it´s lower price and high mobility.
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Optimization of axle carier for formula student for SLM fabrication
Vaverka, Ondřej ; Růžička, Bronislav (referee) ; Koutný, Daniel (advisor)
This diploma thesis deals with design of axle carrier for Formula Student. The axle carrier is topologically optimized and additively manufactured with Selective Laser Melting technology. Material for its production is aluminium alloy AlSi10Mg, which has worse mechanical properties than commonly used high-strength alloys. Therefore the aim was, by using topology optimization, to design a component, which would have comparable properties with milled component. The stress strain analysis was carried out by the finite element method and maximum deformation and safety coef-ficients were acquired. The prototype was made and its dimensions were controlled by optical digitization, which proved accuracy of manufacturing. The strength calcu-lations were verified by special testing device and photogrammetry measurement. The load during the tests was 20 % higher than in the analysis and no limit state was observed. This verified its safety and functionality.
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Testing of automotive sport suspension
Čípek, Pavel ; Růžička, Bronislav (referee) ; Strecker, Zbyněk (advisor)
The diploma thesis deals with testing of sports car suspension. The aim is the testing of fast magnetorheological damper in semiactive suspension that corresponds to quarter car model. The fast magnetorheological damper has a response time 2 ms. If the response time is short enough (order of units miliseconds) it is possible (based on earlier simulations) to achieve improvement of driving safety (better stability of force of tyre on roadway) and comfort (reduction of vibrations). The thesis proves this statement with series of experiments.
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