ФОРМИРОВАНИЕ ОПТИМАЛЬНЫХ УРОВНЕЙ КВАНТОВАНИЯ УПРАВЛЯЮЩИХ ТОКОВ ДЛЯ ЛИНЕЙНОГО ШАГОВОГО ПРИВОДА ПРЕЦИЗИОННЫХ СИСТЕМ ПЕРЕМЕЩЕНИЙ

The paper proposes a method of taking into account accumulated and temperature errors while forming coordinate discrete grid of a linear stepping drive. An algorithm for determination of optimal quantization levels of control currents of drive's phases has been developed in the paper; it minimizes an error of positioning that forms correction files for application of a control system in the software. Investigations on stability of discrete grid nodes coordinates have been carried our with the help of a monitoring station for accurate parameters of linear stepping drive. The investigations have proved an efficiency of the proposed algorithm and methodology for forming coordinate discrete grid.Предложена методика учета накопленной и температурной погрешностей при формировании координатной сетки дискретности линейного шагового привода. Разработан алгоритм определения оптимальных уровней квантования управляющих токов фаз привода, минимизирующих погрешность позиционирования, в результате которого формируются файлы коррекции для использования в программном обеспечении системы управления. С помощью станции контроля точностных параметров ЛШП были проведены исследования стабильности координат узлов сетки дискретности, которые подтвердили эффективность предложенного алгоритма и методики формирования координатной сетки дискретности

GENERATING OF OPTIMAL QUANTIZATION LEVELS OF CONTROL CURRENTS FOR LINEAR STEPPING DRIVES OF PRECISION MOTION SYSTEMS

The paper proposes a method of taking into account accumulated and temperature errors while forming coordinate discrete grid of a linear stepping drive. An algorithm for determination of optimal quantization levels of control currents of drive's phases has been developed in the paper; it minimizes an error of positioning that forms correction files for application of a control system in the software. Investigations on stability of discrete grid nodes coordinates have been carried our with the help of a monitoring station for accurate parameters of linear stepping drive. The investigations have proved an efficiency of the proposed algorithm and methodology for forming coordinate discrete grid

Generating of optimal quantization levels of control currents for linear stepping drives of precision motion systems

Предложена методика учета накопленной и температурной погрешностей при формировании координатной сетки дискретности линейного шагового привода. Разработан алгоритм определения оптимальных уровней квантования управляющих токов фаз привода, минимизирующих погрешность позиционирования, в результате которого формируются файлы коррекции для использования в программном обеспечении системы управления. С помощью станции контроля точностных параметров ЛШП были проведены исследования стабильности координат узлов сетки дискретности, которые подтвердили эффективность предложенного алгоритма и методики формирования координатной сетки дискретности. The paper proposes a method of taking into account accumulated and temperature errors while forming coordinate discrete grid of a linear stepping drive. An algorithm for determination of optimal quantization levels of control currents of drive’s phases has been developed in the paper; it minimizes an error of positioning that forms correction files for application of a control system in the software. Investigations on stability of discrete grid nodes coordinates have been carried our with the help of a monitoring station for accurate parameters of linear stepping drive. The investigations have proved an efficiency of the proposed algorithm and methodology for forming coordinate discrete grid

Biodegradability and Compostability of Nanofibrillar Cellulose-Based Products

Biodegradability and compostability of nanofibrillar cellulose-based (NFC) products including films, concentrated NFC and paper products containing NFC were evaluated under controlled composting conditions. All the NFC products tested were biodegradable according to the requirements set in European standard EN 13432. NFC even enhanced the rate of biodegradability of paper containing 1.5 % NFC as an additive. Disintegration during composting was evaluated using the modified pilot-scale composting test EN 14045. NFC films disintegrated completely in 3 weeks of composting, and NFC did not influence the degradability of paper products containing NFC. Ecotoxicity during biodegradation of NFC products in a compost environment was evaluated using a bioluminescence test with Vibrio fischeri. No acute toxicity was detected for any of the sample