http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
K. V. Smyrnova,A. D. Pogrebnjak,V. M. Beresnev,S. V. Litovchenko,S. O. Borba‑Pogrebnjak,A. S. Manokhin,S. A. Klimenko,B. Zhollybekov,A. I. Kupchishin,Ya. O. Kravchenko,O. V. Bondar 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Nanostructured multicomponent (TiAlSiY)N coatings were fabricated by the cathodic-arc physical vapor deposition (CAPVD). In this study, a bias potential applied to the substrate was − 200 and − 500 V, and changes in structure and propertiesof coatings were investigated. Samples had a single-phase state with a face-centered cubic (FCC) lattice. Small crystallitesof about 7.5 nm and texture with [110] axis were observed at − 500 V. However, lower bias potential resulted in the formationof crystallites of about 41.6 nm with [111] preferred orientation. Moreover, coatings were characterized by superhardstate and demonstrated low wear, high abrasion and crack resistance. The testing of the polycrystalline cubic boron nitride(PCBN) cutting inserts covered with (TiAlSiY)N revealed an increase in the tool life coeffi cient during cutting by 1.66times in comparison with the base tool material. Therefore, (TiAlSiY)N coating is a perspective material for application asa protective layer in cutting tools.
Basic Algorithms of Adaptive Position-path Control Systems for Mobile Units
V. Pshikhopov,M. Medvedev,B. Gurenko,M. Beresnev 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Today, mobile objects are finding increasing usage in a wide variety of applications. Robots have been put to use in the air, on the ground and under the sea. Along with this expansion in robot technology, the problem of control and autonomous decision making is an ongoing concern, especially in light of the increasing difficulty of tasks. This study is focused on the algorithms of adaptive control system for mobile objects. The authors examined the application of direct adaptive control with reference to model approaches, in particular the position-path method. Point positioning is discussed, and the authors propose a method for efficiency improvement. Parametric uncertainty and influence of immeasurable disturbances are expected. Basic algorithms for the calculation of controlling forces and moments are synthesized using the position-path control method. The authors propose a structure and algorithms of an adaptive position-path system with a reference model. The synthesis of adaptive regulator and stability analysis of closed-loop system is performed, and an example of regulator synthesis is given. Finally, the authors present simulation results for an autonomous unmanned underwater vehicle equipped with a main engine, nose and hydrodynamic rudders on the tail. Along with this, horizontal and vertical maneuvering devices are presented.