Performed by: Kamil Bobrowski
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Witold Beluch, DSc PhD Eng. Assoc. Prof.
The purpose of this thesis was to design, fabricate and program a mobile platform for indoor security screening. A stable structure with a total of six support points was chosen, with a minimum of three points always present when walking. The Autodesk Inventor computer environment was used to complete the task. Supporting elements of the whole structure were made of PLA using 3D printing technology. The system for moving the platform was implemented on an Arduino Uno board. A servo controller with I2C communication was added to the board. Data collection from the environment (camera and sensors: temperature, humidity, gas) and visualization of the obtained information were implemented using Raspberry Pi 3B+ computer platform. An intuitive-to-use website interface was designed to operate the platform using a mobile device such as a smartphone or tablet.
Performed by: Szymon Bury
Fields of Study: Mechanics
Speciality: Modelling And Optimization Of Mechanical Systems
Supervisor: Adam Długosz, DSc PhD Eng. Assoc. Prof.
In this work, a theoretical and numerical model of the Joule-Lenz effect is applied to
design and solution of the passive current protection problem.
Coupled electro-thermal analyses were performed in Ansys Workbench system for different variants
boundary conditions. The obtained solutions in the form of Joule heat and temperature values have been compared
with the solution obtained using analytical formulas. For all variants
analysis variants, high agreement of the solutions was obtained. In addition, an actual test for tripping the backflow preventer was carried out as part of the work.
Performed by: Jacek Witek
Fields of Study: Mechatronics
Speciality: Modelling And Simulation Of Mechatronic Systems (ME3)
Supervisor: Wacław Kuś, DSc PhD Eng. Assoc. Prof.
In this work, a mechatronic system was designed and created in the form of a prototype Stewart platform (minature flight simulator). A concept was developed and electronic circuits (Phidgets Inc.) were fabricated to control the platform, and a real model was made. The platform is controlled by executing in real time the control program written in C++ language. In addition, numerical simulations were performed for the built system (Ansys Workbench) and HIL (Hardware in the Loop) applications were created to verify the numerical simulation results. The prototype of the miniature flight simulator was presented at the 2013 Scientists' Night academic event. The work was presented at the 2014 Computer Methods student research conference.
Performed by: Wiktor Klimek
Fields of Study: Mechanics
Speciality: Modelling And Optimization Of Mechanical Systems (MB4)
Supervisor: Adam Długosz, DSc PhD Eng. Assoc. Prof.
The work deals with the issues of numerical modeling of composite materials and selected experimental studies for this type of materials. The theoretical description of the basic information about composite materials and methods of their manufacturing was included in the thesis. For numerical analysis, Finite Element Method in the form of Ansys and MSC.Patran/Nastran software packages was used. Modules dedicated to composite materials were used for modeling. Based on the numerical analyses performed, a thorough comparison of the strength properties for carbon fiber reinforced laminates depending on their parameters (including fiber ply angles, their thickness) was carried out. Moreover, static tensile tests of samples made of carbon fiber reinforced laminates were carried out in this paper.
An interesting and valuable element of the work was also the study of the stiffness of a wing fragment of an unmanned aircraft. Both experimental testing and numerical analysis of this component were performed. The failure criterion of the tested fragment of the structure was checked using the Tsai-Hill criterion. For this purpose, appropriate scripts were created in Matlab software, which were linked to the Patran/Nastran system.
Performed by: Kamil Sajdak
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Prof. PhD Eng. Ewa Majchrzak
This paper presents a successful attempt to experimentally verify the possibility of transforming temperature data into perfusion data. The developed mathematical model was obtained based on the assumption that the sum of heat fluxes discharged from the body interior to the skin surface is equal to the sum of fluxes flowing from the skin surface to the environment. Upper figure shows a diagram of heat exchange in the human body. Lower figure shows a thermogram of the face. The colors representing temperature change from black for temperatures below 30⁰C to white for 35⁰C. Such figure shows the distribution of blood perfusion. The highest value occurs in the eye region.
Performed by: Tomasz Marczewski
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Mirosław Szczepanik, PhD Eng. Assoc. Prof.
The aim of the work was to perform acoustic analyses of automotive silencers of various structural forms using Ansys program. The author focused his attention on a group of resonant silencers. The principle of operation of a resonant silencer is based on multiple reflection of a sound wave moving with the exhaust.
A change in cross-section causes the wave to be reflected, and perforations made in both the inlet and outlet pipes help the wave propagate in different directions. The author has presented many analyses for different design forms of resonant silencer in this paper. The following are: air circulation scheme in the attenuator, geometric model, visualization of pressure distribution at 1530 Hz and frequency dependence of attenuation efficiency at air temperature of 20⁰C and 100⁰C for an attenuator with three resonant chambers with perforations.
Performed by: Rafał Zimnowodzki
Fields of Study: Mechanics
Speciality: Modelling And Optimization Of Mechanical Systems (MB4)
Supervisor: Adam Długosz, DSc PhD Eng. Assoc. Prof.
The work concerned the numerical analysis of auxetic materials, i.e. materials having a negative Poisson's ratio. To create geometric models, the author used CAD systems Inventor and Design Modeller of Ansys system. Numerical analyses were performed using Ansys system. The author prepared and performed numerical analysis for different geometric models of auxetic materials - 1D, 2D and 3D. The obtained results were evaluated in terms of auxetic effect and stress analysis. In addition, as part of the study, an experimental investigation was carried out on a sample of the auxetic material, which was 3D printed from Ninjaflex material. In the experimental study, the corresponding strain components were recorded using video-extensometers to determine the Poisson's ratio.
In addition to the extensive numerical analysis and experimental investigation conducted in this paper, specialized sample holders for auxetic materials were designed and fabricated as part of this work.
Performed by: Waldemar Mucha
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Wacław Kuś, DSc PhD Eng. Assoc. Prof.
This dissertation shows the complete design of the mechanical structure of a three-wheeled mobile robot for exploration purposes equipped with a camera rotating in two axes. A number of strength analyses were performed using the Finite Element Method: frame analyses (static, modal and dynamic for various obstacle impacts), coupling and gear analysis of the drive system for a locked driven wheel. The results of the analyses confirmed that the support structure of the robot can withstand the taken into account possible load cases. A control algorithm has been developed for the robot to work in manual mode (where the robot movements are controlled remotely by an operator) and in autonomous mode, where the robot should reach its destination avoiding obstacles. The autonomous mode algorithm has been developed on the basis of classical logic; it is illustrative and intended to demonstrate the possibility of autonomous operation of a robot equipped with appropriate sensors. A fully functional robot prototype has been made based on the technical documentation of the mechanical structure. The control system of the prototype is based on Arduino platform and implements the developed control algorithms for manual and autonomous mode.
Performed by: Grzegorz Ozimek
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Witold Beluch, DSc PhD Eng. Assoc. Prof.
The aim of this study was to find the optimal reinforcement percentage for a composite material (micro-scale construction) for selected criteria adopted at the macro-scale. The following techniques were combined to solve the task:
- Numerical homogenization using Representative Volume Element (RVE).
- Finite Element Method (commercial software package);
- Evolutionary algorithm of multi-criteria optimization NSGA-II.
A software interface was developed to exchange information between the techniques.
Performed by: Dawid Kubacki
Fields of Study: Automatics and Robotics
Speciality: Modeling Systems And Processes (AB3)
Supervisor: Marek Paruch, DSc PhD Eng. Assoc. Prof.
The purpose of this work was to perform a numerical analysis of heat flow in a floor radiator. A water based floor heating radiator was analyzed, it was analyzed as a planar and spatial model. The steady state and transient heat conduction equations were used in this work. The main part of the analysis was performed using MSC Marc/Mentat computational program, other graphical and computational programs were also used to support it, such as Siemens Unigraphics NX (geometry preparation), MSC Patran (finite element mesh preparation).
The work won the second place in the Polish Society of Theoretical and Applied Mechanics competition for the best master's thesis in mechanics in 2012.
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