A B S T R A C T This paper deals with the research of friction coefficient in tribopairs

This paper deals with the processes occurring on the surfaces of materials during the interaction between metal and non-metal parts of various biomechatronic devices, such as prostheses, orthoses and exoskeletons. These mechatronic systems require careful selection of materials for design and manufacturing of their parts taking into consideration not only mechanical properties of the materials, but also their tribological characteristics. Friction pairs duralumin-fluoropolymer and stainless steel 100CrMn6-fluoropolymer were chosen for the research as the samples. Experimental research was carried out with the use of the universal friction machine MTU-1. For this research, the scheme "plate-onplate" was used without lubricants. Friction torque, friction coefficient and the temperature in the contact area versus the runtime were obtained as a result of the experiments. Furthermore, estimation of wear of contacting samples was performed. Analysis of the results allowed us to choose suitable materials for design and manufacturing of orthoses, prostheses and exoskeletons.

Direct Metal Laser Sintering (DMLS) is an advanced additive manufacturing (AM) technique for the 3D printing of metals. This technology is also beneficial in the jewelry industry, where precious metals are used, and the design and price are determinative factors. In this paper, the metal 3D printing process for jewelry production is discussed. Four rings made of gold, silver, titanium, and stainless-steel 316L have been designed and fabricated by AM machine based on the DMLS technique. Proper geometry and parameters for rings and support structure were determined. Results showed that a reduced amount of powder was required for 3D printing of metal rings using a locally developed AM machine. Besides, appropriate geometry and parameters for a jewelry box with a complex design have been specified to be fabricated from stainless steel 316L by the same AM machine. The quality of the final produced parts using DMLS technology was not demonstrated inferior compared to the quality of parts built by conventional manufacturing methods. Furthermore, utilizing an electron microscope the microstructures of the fabricated parts were obtained and analyzed in detail before and after polishing on the polisher machine. Results revealed that the maximum homogeneous surface was obtained for the gold and titanium samples, while the surface of the samples of stainless steel and silver had internal cavities, pores, and other defects. Also, it was concluded that usage of gold and silver for the manufacturing of jewelry product that does not experience heavy loads is quite justified.INDEX TERMS Additive Manufacturing (AM), Direct Metal Laser Sintering (DMLS), microstructure analysis, jewelry design, precious metals, 3D printing.

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Решение задачи управления беспилотным автомобилем основывается на использовании теоретико-технических разработок в сфере технического зрения и траекторного управления. Методы технического зрения использованы для анализа окрестности движения транспортного средства. В основу разработки алгоритма положен глобальный анализ геометрических связей между элементами изображения: дорожной полосой и движущимся автомобилем. Этот алгоритм представлен как часть системы управления беспилотным автомобилем с использованием языка Lua, а также обобщенного преобразования Хафа. Приведены примеры реализации алгоритма.