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The design of the recuperative heater flue gas - air
Procházka, Tomáš ; Baláš, Marek (referee) ; Milčák, Pavel (advisor)
The bachelor s thesis deals with thermal-hydraulic calculation of recuperative gas air he- ater. Type of heat exchanger is shell and tube. This thesis is divided to two parts. The first part apprises the most common types of heat exchangers and their use. It contains also description about basic methods and equations for heat exchanger designing. The second part is calculation of heater with software EES. Whole calculation is checked by software HTRI Xchanger Suite. At the end of this thesis are two datasheets, whitch contains designing solutions for heater with plain tubes and solution with fin tubes. Conception of heat exchanger is chosen by TEMA Standards.
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Compatibility of Vehicles in a Frontal Collision
Vašíček, Jiří ; Kovanda, Jan (referee) ; Coufal, Tomáš (advisor)
Thesis deals with the compatibility of vehicles in a frontal collision. The first section discusses about compatibility from different views. There are the physical processes used in the mechanics of impact. The second part is focused on solving the compatibility of vehicles in a frontal collision by crash analysis using the finite element method. Firstly there are described collisions of vehicles from different vehicle classes (small cars, lower middle class, Pick up / SUV) into the fixed barrier by the US NCAP. Furthermore there are simulated head-on collisions of vehicles from different vehicle classes. In the end there is shown the possibility of using data from crash tests to determine the EES.
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Comparison of Selected Real Traffic Accidents to Crash Tests
Rybková, Tereza ; Sojka, Jiří (referee) ; Semela, Marek (advisor)
This master’s thesis presents an overview of the basic forces acting on the vehicle, the basic methods of analysis of accident, collection of data used in the analysis of accidents, an overview of the basic performance criteria and thresholds used in the homologation test of occupant protection in a frontal impact, used crash tests, homologation tests and specifications for these tests. Attention is paid to Euro NCAP crash tests and to homologation tests of vehicles Skoda Octavia with aim to try to compare them with selected accidents in terms of depth and character deformation and evaluate findings comparision.
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STIFFNESS ANALYSIS OF FRONT PART OF THE VEHICLE
Coufal, Tomáš ; Kovanda, Jan (referee) ; Kohút,, Pavol (referee) ; Vémola, Aleš (advisor)
The thesis deals with the front part stiffness of modern vehicles, especially for the use in the field of forensic engineering in the traffic accident analysis. During the traffic accident analysis, an inquiry into the collision between vehicles is carried out which is an integral part of determining the energy loss of the vehicle at the impact, or more precisely the deformation energy expressed in the form of Energy Equivalent Speed (EES). In case of known stiffness of given part of the vehicle and based on the depth of deformation, it is possible to calculate the deformation energy, or more precisely EES corresponding with given damage of the vehicle. In the field of forensic engineering, the values of stiffness of individual vehicle components are not known and therefore, alternative methods are used to calculate the EES, they are outlined in the research part of this dissertation. However, the current methods of EES determination have some limitations when it comes to usability, and therefore, new EES calculation for the front part of the vehicle was designed in the research. It was based on the real crash test results using real stiffness characteristics of the front part of a vehicle. The front part of the vehicle is divided into individual areas and each of these parts is characterised by its own stiffness coefficient. The designed EES calculation can thus be also used for collisions with partial overlapping, taking into account the real stiffness of the damaged part of the vehicle, which was not possible with existing methods. In the research part of this dissertation, a computer programme to calculate deformation energy and EES was processed. It works with individual stiffness characteristics in given areas where the input data are entered by the user and include the depth of permanent front part deformation in individual areas, vehicle weight, the direction of an impact force and the friction coefficient on the contact surface. Considering the fact that the vehicle stiffness is also one of the control parameters at solving collisions in the PC-Crash simulation programme, which is used in forensic engineering practice for the analysis of a collision process, a supplementary computer programme was designed. Based on the above-mentioned input data, the supplementary programme can further calculate data for collision solving in the simulation programme, namely stiffness, restitution coefficient and the vehicle damage stated in the output report of the simulation programme. Based on these data, the expert thus has the opportunity to solve the collision of two vehicles in the simulation programme with as much preciseness as if it was a real collision.
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Design of a flue gas exchanger for the use of condensation heat from flue gas
Čulík, Martin ; Burda,, Radim (referee) ; Baláš, Marek (advisor)
The subject of this thesis is the design of a flue gas exchanger for the use of condensation heat from flue gas. The first part of the thesis is rather theoretical and presents the main issues of condensation and its characteristics. Next, the necessary calculation relations for a complete thermal-hydraulic calculation are given. Using this knowledge obtained from the theoretical part, a flue gas exchanger is then designed in the practical part. Furthermore, for the same parameters, the exchanger is calculated in the PPSD program and both approaches are compared. Finally, a sensitivity analysis will be performed.
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The design of the recuperative heater flue gas - air
Procházka, Tomáš ; Baláš, Marek (referee) ; Milčák, Pavel (advisor)
The bachelor s thesis deals with thermal-hydraulic calculation of recuperative gas air he- ater. Type of heat exchanger is shell and tube. This thesis is divided to two parts. The first part apprises the most common types of heat exchangers and their use. It contains also description about basic methods and equations for heat exchanger designing. The second part is calculation of heater with software EES. Whole calculation is checked by software HTRI Xchanger Suite. At the end of this thesis are two datasheets, whitch contains designing solutions for heater with plain tubes and solution with fin tubes. Conception of heat exchanger is chosen by TEMA Standards.
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Comparison of computation of EES by the linear and the real deformation characteristic
Coufal, Tomáš
Comparison of computation of EES by the linear and real deformation characteristic is showed in the arcticle. The real deformation characteristic is obtained by evaluating and processing the data from the frontal crash test. Further on, the computation of EES from real deformation characteristic and the computation of EES from linear deformation characteristic which is used by the computing software Crash 3 are compared.
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Crash test – a rail vehicle with a bus
Zębala, Jakub ; Ciępka, Piotr
The paper presents the results of a crash test in which a rail unit consisting of an SM 42-611 diesel locomotive and a 411 S snow plough collided with a Jelcz M11 bus. The presented results encompass: the collision velocity of the vehicles, and EES parameter of the bus, as well as simulation of the collision and the post-collision movement of the vehicles, carried out using the PC-Crash program.
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STIFFNESS ANALYSIS OF FRONT PART OF THE VEHICLE
Coufal, Tomáš ; Kovanda, Jan (referee) ; Kohút,, Pavol (referee) ; Vémola, Aleš (advisor)
The thesis deals with the front part stiffness of modern vehicles, especially for the use in the field of forensic engineering in the traffic accident analysis. During the traffic accident analysis, an inquiry into the collision between vehicles is carried out which is an integral part of determining the energy loss of the vehicle at the impact, or more precisely the deformation energy expressed in the form of Energy Equivalent Speed (EES). In case of known stiffness of given part of the vehicle and based on the depth of deformation, it is possible to calculate the deformation energy, or more precisely EES corresponding with given damage of the vehicle. In the field of forensic engineering, the values of stiffness of individual vehicle components are not known and therefore, alternative methods are used to calculate the EES, they are outlined in the research part of this dissertation. However, the current methods of EES determination have some limitations when it comes to usability, and therefore, new EES calculation for the front part of the vehicle was designed in the research. It was based on the real crash test results using real stiffness characteristics of the front part of a vehicle. The front part of the vehicle is divided into individual areas and each of these parts is characterised by its own stiffness coefficient. The designed EES calculation can thus be also used for collisions with partial overlapping, taking into account the real stiffness of the damaged part of the vehicle, which was not possible with existing methods. In the research part of this dissertation, a computer programme to calculate deformation energy and EES was processed. It works with individual stiffness characteristics in given areas where the input data are entered by the user and include the depth of permanent front part deformation in individual areas, vehicle weight, the direction of an impact force and the friction coefficient on the contact surface. Considering the fact that the vehicle stiffness is also one of the control parameters at solving collisions in the PC-Crash simulation programme, which is used in forensic engineering practice for the analysis of a collision process, a supplementary computer programme was designed. Based on the above-mentioned input data, the supplementary programme can further calculate data for collision solving in the simulation programme, namely stiffness, restitution coefficient and the vehicle damage stated in the output report of the simulation programme. Based on these data, the expert thus has the opportunity to solve the collision of two vehicles in the simulation programme with as much preciseness as if it was a real collision.
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Comparison of Selected Real Traffic Accidents to Crash Tests
Rybková, Tereza ; Sojka, Jiří (referee) ; Semela, Marek (advisor)
This master’s thesis presents an overview of the basic forces acting on the vehicle, the basic methods of analysis of accident, collection of data used in the analysis of accidents, an overview of the basic performance criteria and thresholds used in the homologation test of occupant protection in a frontal impact, used crash tests, homologation tests and specifications for these tests. Attention is paid to Euro NCAP crash tests and to homologation tests of vehicles Skoda Octavia with aim to try to compare them with selected accidents in terms of depth and character deformation and evaluate findings comparision.
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