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Tilt sensors
Hájek, Tomáš ; Caha, Luděk (referee) ; Beneš, Petr (advisor)
The topic of the Bachelor's thesis are MEMS sensors of inclination, which find their use inside integrated circuits, equipment of aerospace and automobile industry, but also in ordinary electrical appliance. The work serves the reader to build a grasp over production, usage, basic principles. Finally, it offers an overview of sensors to ease the orientation on the market. The design of the physical model, which can be used to prevent the sensor from apperance of mathematical errors, is tested in the practical part.
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Study of dynamic effect on a bridge structure with moving loads
Zavřelová, Michaela ; Martinásek, Josef (referee) ; Vlk, Zbyněk (advisor)
The goal of the master thesis is a dynamic parametric study on the dynamic effects of high-speed train using the HSLM-A load model on a railway bridge. The calculation model is processed, in RFEM 5.29.01 with RF-MOVE module and prerelease versions RFEM 6 and RSTAB 9, as a 2D member in the XZ plane. Furthermore, static load cases and load models LM 71 and HSLM-A are created. The HSLM-A load model is processed for universal trains A1-A10, which each cross the railway bridge at a total of 15 speeds ranging from 120 km/h to 400 km/h. A detailed parametric study of the dependence of the maximum deformation and acceleration in the Z direction on the speeds of each train set is performed. Modal and time history analysis is used in the parametric study. Part of the work is to determine the resonance region.
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Objectification of Calculation of Passing Sight Distance Parameters
Valentová, Veronika ; Kocourek,, Josef (referee) ; Mahdalová,, Ivana (referee) ; Radimský, Michal (advisor)
Overtaking maneuver is very complex event influenced by many parameters. The most important parameters are vehicle performance, longitudinal slope, the speed at the beginning of the maneuver, the reaction time of the driver. Overtaking distance at CSN 73 6101 is determined on the basis of a simplified physical model. It considers constant speed of vehicles (overtaking and overtaken) and it does not consider a longitudinal gradient of road. This calculation is used for several decades and it is required to verify this procedure. That was the purpose of this work. Detailed physical model was performed for several types of passenger vehicles, performance curves and gear changes were included too. Distances between vehicles at the beginning and in the end of the maneuver were chosen with regard to reaction times of drivers. Distances were compared with conclusions of observation studies. Input values of some parameters were determined by own measurement and compared with data reported in the literature. The analysis was performed using the video camera positioned at the front and rear of the vehicle. For selected vehicle were conducted simulations testing the influence of particular parameters. The parameters with the biggest influence were longitudal slope of the road and rolling friction. To achieve results useful for a possible regulations update for the design of roads another simulation models for 43 variants of passenger cars with different engines and transmissions were done. The vehicles were divided into categories based on engine capacity and engine power (up to 1400 ccm, over 1400 ccm; 66 kW to over 66 kW). Results were compiled in tabular form that could be used to discuss modifications to CSN 73 6101 Design of roads.
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Dynamic analysis of lightweight bridge construction
Krzywoň, Filip ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
The thesis compares the dynamic response of lightweight footbridge structure. Two finite element models were made. One in Ansys 15.0 software, and another in RFEM 5.05 structural software. The results of the models were compared to each other. The response to dynamic excitation from pedestrians was evaluated in accordance to ČSN EN 1990/A2.
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Hodnocení výstupních parametrů elektomobilů
Diviš, Ondřej
The diploma thesis is devoted to the evaluation of the output parameters of electric cars. In the first part, they are described in detail individual construction solutions of electric cars and hybrid vehicles. Another section deals with the main advantages and disadvantages of individual construction solutions. Furthermore, they are outlined here possible development directions in the field of electromobility. The practical part of the work deals with the measurement of acceleration depending on time and the course of the increase in speed during acceleration in electric cars and vehicles with an internal combustion engine with an automatic transmission. The results showed that electric cars have better acceleration characteristics than vehicles with combustion engines with automatic transmission. In the case of electric vehicles, a linear increase in speed occurs, whereas in the case of internal combustion engine vehicles, an uneven increase in vehicle speed over time can be observed further during the reassignment of individual gears. As part of the evaluation of driving modes, it was also found that all vehicles achieved the best acceleration characteristics in the "Sport" mode.
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Influence of Powertrain Type on Vehicle Dynamics
Haniška, Jan ; Semela, Marek (referee) ; Bilík, Martin (advisor)
The aim of this master’s thesis is to assess the influence of the vehicle’s powertrain concept on its driving dynamics. The assessment is carried out with the help of data obtained during driving tests done with test vehicles. As a testing cars were choosen 3 Hyundais Kona with different powertrain types, classic internal combustion engine, a hybrid and a purely electric. Performed tests were the so-called moose test, acceleration, deceleration and it was measured center of gravity for all vehicles too. From the data obtained during individual tests, it was subsequently assessed the influence of the vehicle powertrain type on its driving dynamics.
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Motion activated measurement module with wireless interface
Novotný, Josef ; Krajsa, Ondřej (referee) ; Havránek, Zdeněk (advisor)
This semestral project deals with the selection of a suitable MEMS mechanical motion sensor with verylow power consumption. The market research is mainly about sensors that can be activated by motion. Project also contains description of motion activation function of the sensor ADXL362. Project also contains verification of datasheet data of the sensor ADXL362 for the motion activation. Further It also includes a market survey of microcontrollers with ARM Cotex M4 core. Furthermore, the wireless transmission via Bluetooth is tested and a measurement unit is designed and implemented. At the end of the thesis are achived results summarized.
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Selected issue of electric personal means of transport movement
Konečný, Dalibor ; Stáňa, Ivo (referee) ; Bradáč, Albert (advisor)
Diploma thesis The selected issue of electric personal means of transport movement is divided into three main parts. The theoretical part deals with the description of electric bicycles, electric scooters and electric skateboards. Furthermore, legislation, tuning and issues related to these means of transport. The second part is devoted to the current state of knowledge in this area. The last part is devoted to practical measurement, namely braking, acceleration, acceleration into curves, going through curves, transverse movement and deflection when looking back. There were 10 e-scooters with 9 different riders and 6 e-bikes with 12 different riders. At the end of the work, an overall evaluation is made.
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