The thrust vector control of a rocket engine by disturbing the supersonic flow in its nozzle is used for missile development for various purposes in different countries. Disturbance of the supersonic flow in the jet engine nozzle can be caused by various obstacles on the nozzle wall: solid obstacle, liquid or gas jet, combinations of solid obstacle with injected jets. The simplest and most effective way to create a disturbance is to disturb it by setting a solid cylindrical obstacle on the nozzle wall. The high efficiency is explained by the lack of the working fluid consumption on board the aircraft to create a control force, or its minimum amount necessary to protect the obstacle from the high-temperature oncoming gas flow in the rocket engine nozzle. This paper presents the study results of gas flow simulation with cylindrical obstacle perturbation on the wall of the Laval rocket engine nozzle in its subsonic and supersonic parts. The optimal placement in the nozzle is determined to obtain the maximum lateral control force. As a result of research, it was found that the perturbation of a supersonic flow in a rocket engine nozzle by a cylindrical obstacle has practically the same character when its position changes along the length of the nozzle. In the subsonic part of the nozzle in the median plane, the perturbed pressure on the wall has a positive sign, and on the obstacle wall its sign-alternating. When an obstacle is in the subsonic part of the nozzle, the integral value of the lateral force is negative in comparison with positive for the supersonic part.

The relevance of the subject of this work is determined by the need to reduce the energy consumption of fine grinding by controlling the process, which is proposed to implement based on the results of acoustic monitoring. The paper describes the operation of a jet mill in a closed cycle. It is known that fine grinding refers to energy-intensive production, but jet grinding is indispensable in obtaining thin and ultra-thin "pure" materials, i.e. materials without the introduction of any impurities. And with the creation of a new way to control the process, there is a real opportunity to reduce energy consumption by jet mills while maintaining optimal performance. Based on the process parameter analysis input and output disturbing and control process parameters are selected. In this way, jet grinding is presented as a control object. The problems of jet grinding and ways to solve them are shown. This became the basis for further construction of automatic process control based on the acoustic signals of the grinding zone.

Актуальность тематики данной работы определяется необходимостью умень-шения удельных энергозатрат на разрушение угольного массива органом очистного комбайна путем автоматизации процесса управления скоростью вращения органа, что позволит поддерживать энергоэффективный режим резания угля резцами в усло-виях изменчивых горно-геологических свойств пласта. В работе описан информацион-ный критерий идентификации режимов разрушения угольного пласта органом через статистический анализ активной мощности двигателя привода резания, и проведены исследования закономерности его изменения во времени для различных условий работы комбайна. На основе этого идентификацию режимов разрушения угольного пласта органом предложено осуществлять с помощью перехода к соответствующей лингвистической величине с использованием теории нечеткой логики. Обоснованы термы этой лингвистической величины, и определены их функции принадлежности. Таким образом, создана база для дальнейшей разработки системы нечеткого автоматического управления режимом разрушения угольного пласта органом очистного комбайна.