Mechatronic Systems and Materials VI

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Authors: Andrzej Stefanik, Piotr Szota, Sebastian Mróz, Henryk Dyja
Abstract: One of the modern methods of production of round bars is the process of rolling in three-high skew rolling mill. This method enables the production of bars with both standard materials as well as hard deformation materials. In this paper, the results of theoretical and laboratory research of the 20 mm aluminum A1050 round rods rolling in three-high skew rolling mill process are presented. The numerical analysis was carried out upon applying the Forge 2011® software package. Based on the theoretical research, the stress, strain and temperature distribution during the rolling process were determined. In order to verify the numerical results, rolling aluminum rods were explored in laboratory conditions.
Authors: Piotr Szota, Sebastian Mróz, Andrzej Stefanik, Henryk Dyja
Abstract: Numerical modelling of the round bar rolling process, while considering the wear of passes depending on their shape, was carried out within the present work. The analysis of the rolling process was conducted thus analysing the influence of interstand tension on roll wear. For the theoretical study of the rolling process, Forge2011® was employed, which is finite element method-relying software that enables the thermo-mechanical simulation of rolling processes in a triaxial state of strain. The wear model implemented in Forge2011® permits no quantitative evaluation, but only a comparative analysis of the wear of rolls. In order to use the results of simulation employing the simplified Archard model for the quantitative evaluation of roll wear, it is necessary to define the factor of wear and the hardness of the tool as a function of temperature.
Authors: Andrzej Zbrowski, Tomasz Samborski, Eugeniusz Matras
Abstract: The article presents the structure and operation of the developed system for graphic personalisation of cards and paper sheets. The system is responsible for the input of unique graphics in the form of prints corresponding with suitable data recorded in the memory of a microprocessor. In the verification process, an electronic record is compared with alphanumerical information, and the conformity of digital graphics with the print is checked. The system was used in the construction of a process line for producing RFID-secured documents. The system has a modular structure and is composed of two modules responsible for the prints and automatic verification of graphic personalisation. The printing module enables the application of the print in the form of alphanumerical signs or unique graphic symbols and a barcode, which is conducted according to the structure of the database from which information on personalisation is obtained. The verification module compares the electronic record from the microprocessor with alphanumerical information and checks whether digital graphics agree with the print. Printing is performed using an inkjet printhead, whereas for the verification process, a digital line scan camera is applied. Mechatronic positioning systems enable the printhead and camera shift freely along the print and inspection area and allow changes in positioning speed parameters.
Authors: Stefan Dzionk
Abstract: The paper presents the results of preliminary research and describes the deformation of construction details within the process of producing small elements employing a stereolitography system. The article discusses a scheme for changes in data conversion. Variations in construction details have been described on the basis of analysing photographs.
Authors: Mykola Chausov, Pavlo Maruschak, Olegas Prentkovskis, Andriy Pylypenko, Valentyn Berezin, Kateryna Volyanska
Abstract: Using an original experimental methodology and software for contactless investigation into strains applying the method of digital image correlation, conditions for DNP realization in the test setup with pre-set rigidity have been found. Strain velocities have been determined to be equal to 2...10 s1 in the processes of forming and developing a dissipative structure of heat resistant steel under the DNP (dynamic non-equilibrium process).
Authors: Algirdas Sokas, Lionginas Čiupaila, Daiva Makutėnienė
Abstract: This paper analyzes a computer program of virtual robot in the drawing. The objective is to find way between two points in the flat space with graphical objects fences. This is an idealized task that a robot has to solve seeking to find its way in the environment (drawing). The virtual robot uses the graphical sensors system and the fuzzy navigation system to find way between the start and target points. Before making another step toward the goal, the robot checks the environment: draws a line in front, two lines to the right and to the left, and if there are points of intersection with other graphical objects makes the decision to turn angle. Fuzzy controller ensures the robot's behavior. The computer program of robot navigation system in the drawing is analyzed. Intelligent robot system is discussed and conclusions are made.
Authors: Kristjan Tiimus, Mikk Murumäe, Eero Väljaots, Mart Tamre
Abstract: Unmanned aerial vehicles (UAVs) are used predominately for military applications, despite a growing number of emerging civilian tasks. One of the key tasks for increasing the advantages over a manned aircraft are to extend the flight duration of the UAV. Long endurance flights demand an engine that adapts to variable weather and atmospheric conditions as well as to changes in altitude. Varying demand of the UAV for power is compared to determine the needs for our mid-class test platform. The paper presents a solution to a high-efficiency engine and suggests a test layout for assessing reliability and optimal performance.
Authors: Eero Väljaots, Raivo Sell, Mati Kaeeli
Abstract: The paper investigates the data acquisition method and a system of wheeled mobile unmanned ground vehicles (UGV) for characterization and optimization of motion and energy efficiency. This enables to conduct real-time and conditional field tests. The obtained results are used for an advanced methodology framework for robotic design targeted on the development, simulation and testing of vehicle platforms along the entire design process.
Authors: Andrzej Zbrowski, Wojciech Jóźwik
Abstract: The article presents the process of determining the speed of an unmanned rescue vehicle.The conducted investigations involved a measurement system developed for testing dynamic lorries. The application of a test system for low-speed all-terrain vehicles was possible due to a wide measurement range of sensors. Speed was tested employing two following methods:an indirect method consisting of the measurement of the instantaneous rotational speed of the wheel;a direct method consisting of the measurement of speed against the ground, taken with an optical speed sensor.The authors also describe the sources of interferences characteristic of both methods that include:the wheelspin affecting the correctness of speed determination in the indirect measurement;the unevenness of the surface (ground) hindering the correct operation of the optical speed sensor.The paper also presents the characteristics of the rotational speed of the wheels obtained in road and off-road conditions. Based on the obtained signals, linear speed was determined. Additionally, the article discusses methods for eliminating measurement disturbances.
Authors: Ivans Grinevich, Natalija Mozga, Guntis Strautmanis
Abstract: In presented paper, the screwdriver’s electric power consumption studies depending on the corresponding fixed threaded joint’s assembly time are carried out. So far there are no recommendations from the tool manufactures for screwdriver’s optimal operating modes (the conclusion is made on the base of the attached instructions which provide instrument manufacturers), when evaluating this aspect upon taking into account the electrical power consumption and assembly time for different types of fixed threaded joints (wood, metal, plastic, etc.) and also taking into account obtainable tightening moments. In the examined literature sources which deal with the opportunities concerning the optimization of the automated assembly processes of fixed threaded joints, not enough attention is paid to the reduction of the instrument’s energy consumption which is one of the main tasks in the industrial process because it directly impacts production costs.

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