Mathematical models of induction motor are considered. Based on one of the models, an adaptive indirect field-oriented control algorithm is proposed that allows maintaining specified values of torque and the rotor angular velocity despite the fact that the load torque, rotor resistance and inductance are unknown

Hardware implementation of a method for processing phase-shift-keyed and frequency-shift-keyed signals based on two-stage nonlinear digital filtering is presented. The first stage is an informationally optimal linear filter with complex coefficients, the second is a quadratic filter based on the Capon minimum-variance method. The algorithm is implemented in hardware as a stand-alone device with an embedded computing system based on programmable logic integrated circuits..

Simulation results describing the heat source formation and optical properties modification of the zinc oxide sol-gel films with silver nanoparticles by the series of ultrashort laser pulses in heat-accumulation mode are demonstrated. Based on presented relationships between laser exposure modes, the optical characteristics of films and the properties of nanoparticles in them, the possibility of predicting the optical properties of the composite materials is shown.

Robotic painting, which combines advanced image generation algorithms with modern mechatronics, is considered as one of the areas of computer creativity. Results of developing a brush model for a robot artist based on the collaborative robot Jaka Zu 3, are presented. Particular attention is paid to the dry brush effect, a technique in which “airy”, textured strokes are applied with a brush containing a small amount of paint. This technique has not been used in machine painting on purpose before. An experimental setup is described, including a collaborative robot Jaka Zu 3 with a brush, a table, a canvas, a camera, and a lighting system. The concept of integral brushstroke density is introduced, which characterizes the amount of paint remaining on the canvas when a brushstroke is applied with a dry brush. Based on the experimental data, a new mathematical model is proposed that allows one to control the width of brushstrokes and their integral density. The obtained results can be used both in computer imitation of painting and in practical implementations of robot artist designs.

Results of a study of a simulator of a transport and launch container designed for conducting vibrationdynamic tests of CubeSat 6U standard nanosatellites are presented. The frequency analysis of the device is carried out in CAD SolidWorks in the range from 5 to 140 Hz. As a result, two resonant frequencies of 42.25; 75.42 Hz in the Z plane and one — 42.25 Hz, for the X and Y planes, are identified. Results of full-scale tests of the designed device for searching resonances by measuring amplitudes and frequencies are presented. It is found that the frequency shift did not exceed 5% over the entire range, and the greatest amplitude shift is 18% at the frequency of 40.2 Hz in the Y plane. The obtained values indicate that the designed device can be used as equipment for vibration-dynamic tests of satellites. The discrepancy between the values of resonance frequencies obtained during full-scale and model tests did not exceed 5%, which satisfies the standard requirements for the convergence of measures.

The possibility of using single-mode optical fiber applied in telecommunications to create a liquid boiling alarm is investigated. It is established that when the temperature of liquid boiling is reached, the coefficient of optical radiation reflection by the interface of two media — the fiber core and the liquid — changes. As a result, the power of optical signal reflected back into the fiber from the interface of such media increases. An increase in the power of the reflected signal to a certain value indicates that the boiling point of the liquid has been reached. It is shown that the difference between the attenuation value on the reflectometer scale at the maximum point for the peak of the reflectogram of a single-mode telecommunication optical fiber and the attenuation value on the reflectometer scale before the peak of this reflectogram can be used as an information parameter for determining the moment of reaching the boiling point.

Features and variants of the proposed new method for determining magnetic susceptibility χ such a specific ferro (ferry) magnetic as a single particle of small size are described — on the basis of an analysis of the competition of forces, including magnetic force (dependent on χ), acting on the studied particle moving vertically in a column of resting liquid. It is stated that the fulfillment of the formed requirements for the implementation of the magneto-rheological method (MR-method) will allow to reasonably reduce in the general case the three-dimensional problem of determining χ to a productive one-dimensional one, and to a force balance equation that is quite acceptable for achieving a solution. Three variants of the MR-method are considered: with the movement (forced sedimentation) of the particle down, with its movement up and with the controlled movement of the particle up to the state of its hanging. The corresponding expressions for determining χ from data obtained during experiments are given.

Results of a study of modern aviation hydraulic fluids based on phosphate ester carried out with the use of laboratory refractometer IRF "Compact", are presented. Experimental data on the refractive index depending on the concentration and temperature of the solutions of the studied aviation hydraulic fluids are obtained. Highly accurate and reliable information on the composition and consumption of the substance is necessary for the work of airport technical services. The optical diagram and technical parameters of the measuring device are given.

A thermoelectric device for treating panaritium by local hypothermia of the affected area of the finger is considered. The design of the device is described, and its experimental studies are conducted. According to the results of the studies, the thermoelectric device fully provides the necessary thermal action modes for implementing the local hypothermia technique in treating panaritium. Comparison of theoretical and experimental data shows that their difference is 7–8%.

The possibility of using a laboratory prototype of a direct exposure setup using a liquid crystal (LC) matrix to form a topology on a photosensitive material to compensate for printed circuit board (PCB) deformation during their production is investigated. Existing methods for assessing PCB deformation are considered — a method for compensating for deformation at the exposure stage based on the method of controlling the compatibility of topological layers is proposed. Assumptions simplifying its implementation are defined for the proposed method. The hardware upgrade of the laboratory prototype of the setup was performed by adding a feedback loop in the form of a video camera providing information on the PCB position on the working field. Elements of preparing the setup for operation are defined. An algorithm for generating images for display on the LCD matrix is developed and tested.