An experimental prototype of electric motor on permanent (FeNdB) magnets with switchable magnetic flux with two sectioned stators and a rotor using SMC material based on encapsulated metal powders has been developed. The method of manufacture of magnetic cores by powder metallurgy method on the basis of magnetically soft encapsulated titanium dioxide composites has been developed, including computer modeling of magnetic cores components, creation of tooling for their manufacture by pressing and selection of technological modes of pressing. Press set for manufacturing stator components by pressing in the form of a mold was made of hardened 5XHB steel. With its use magnetic components for twostator combined electric motor are pressed. The main electromagnetic characteristics of the components were measured with an express magnetometer. Complex studies showed that the magnetic components have sufficient strength and the necessary electromagnetic characteristics to create a two-stator combined electric motor of this type. An experimental sample of electric motor with maximum power of 15 kW was created on the basis of manufactured magnetic components. Advantages of composite material over electrical steel and other soft magnetic alloys allow providing their wider application in electric machines in order to increase specific power at high speed of rotation with less losses.

We have studied the dependence of the characteristics, strength and plasticity, as well as the microhardness of specimens made of corrosion-resistant steel 40X13 on the modes of laser surface hardening by a fiber laser. Depending on the size of the scanning spot and the scanning speed, 3–5 tracks were applied on opposite planes of the sample with overall dimensions of 20 × 200 mm. Samples were tested for static fracture and the microhardness of the material of the samples was studied in terms of the depth of the changed structure. It was found that the fracture of the treated samples in all cases was of a brittle nature with a low level of destructive deformations at stresses below the tensile strength of the original material. The plotted tension diagrams indicate an insignificant effect of laser processing on the value of the elastic modulus of the material. Studies of the hardness of the material of the laser-hardened track and the microhardness of the material along the depth of the zone of the changed structure showed their increase up to 3–4 times compared with the initial characteristics. The results obtained can serve as a basis for studying the relationship between the modes of heating by a laser beam and the properties of the material of the hardened zone.

The deformation behavior of the titanium nickelide alloy Ti–55.84 wt. % Ni (TiNi) with titanium nitride (TiN) coatings obtained by arc-PVD has been simulated. Differential scanning calorimetry and three-point bending test were used to study the parameters of martensitic transformations and the deformation behavior of this alloy. The values of the characteristic temperatures for the TiNi alloy that can be used in medical applications were substantiated. The elastic-force characteristics of the alloy related to the properties in the superelastic state were considered. The dependiences of the change in the phase yield strength, the stress of the unloading plateau, and the residual deformation of the TiNi samples with TiN coatings on the ambient temperature range between 6 to 37 °C were determined. Based on these dependencies, a deformation curve was obtained that can predict the mechanical behavior of a TiNi product, for example, a stent, before and during its implantation into a human body. TiNi-based shape memory alloys are widely used in various branches of medicine; therefore, the development of technological methods for manufacturing products from TiNi with high corrosion resistance is promising.

An analytical dependence was obtained to determine the amplitude of vibrations of the rubber track in the span of the free branch of the tractor bypass between the supporting rollers. The process of oscillations of this type of track in the middle of the span of a free branch during the operation of tracked tractors of the brand “Belarus” in pull and transport modes, taking into account the speed of movement, is investigated. It is shown that the resonant modes of transverse vibrations of the rubber track at the operational ranges of the tractor operation should be taken as the determining criterion for choosing the parameters of the spans of the free branch of the bypass. The maximum values of the oscillation amplitudes of such a track in the span of the free branch of the bypass between the supporting rollers for the family of tracked tractors “Belarus” under different operating modes are calculated. A frequency analysis of oscillations was carried out and it was found that on tracked agricultural tractors with rubber tracks, a mode of occurrence of resonant oscillations in the span of the free branch of the bypass between the supporting rollers is possible. An analytical dependence has been obtained to determine the limiting distance between the supporting rollers of a tractor with a rubber track and elastic and locked suspensions according to the criterion of deducing the resonant mode of vibration of the track in the span of a free branch outside the operational range of the tractor. The values of the maximum distances between the support rollers for tractors “Belarus” 1802, 2102 and 2103 at different suspension modes are calculated. The required number of supporting rollers is determined and recommendations are given on the place of their installation. The results of these studies can be used in the creation and operation of tractors with rubber tracks

The results of the study of the heating process of wet capillary-porous bodies of various compositions (meat products) during heat treatment in dry air and steam-air mixture under conditions of forced circulation of the heating medium are presented. The studies were carried out on a moist fat-free sample (chicken fillet meat) and a low-moisture fat sample (pork shoulder blade) formed in the form of a cylinder and a plate. It is shown that the process of heating of meat products of various compositions obeys the laws of the theory of unsteady thermal conductivity of homogeneous bodies, despite the variety of accompanying phase and physico-chemical transformations. It is established that the regular mode of non-stationary thermal conductivity occurs at Fo ≥ 0.2 for all the studied variants. Based on the processing and analysis of experimental data, criterion equations of the form Θ = f(Fo,Bi) for the central layer of the studied products in the temperature range 160–240 °C were obtained. It has been established that the peculiarities of heating of meat products in a vapor-air mixture environment lead to lower values of the coefficients μ1 and N(Bi) at regular operation compared with heating in dry air. It was found that low-moisture fatty samples are characterized by lower values of μ1 and N(Bi) in comparison with moist fat-free ones. As a result of comparison with tabular data for solids, it is shown that the experimental coefficients μ1 and N(Bi) are characterized by lower values for all the studied variants. It is established that the nature of the change in N(Bi) and μ1 for solids and the studied products is opposite, i.e., with an increase in the number of Bi, an increase in N(Bi) and μ1 is characteristic for solids, while their decrease is characteristic for the studied products. The practical significance of the research consists in improving the quality characteristics of minced meat products and optimizing operational production planning through the use of the methodology of predictive calculation of the duration of thermal operations.

In this paper, a developed hardware-software complex for studying volume parameters of breathing is considered. To estimate the volumetric parameters of breathing, a method for registering the movement of the chest and abdominal walls by changing the overall dimensions of the chest and abdomen with ranking according to the anatomical features of a person is proposed. A technique for researching the volumetric parameters of breathing based on the method of video recording of the movements of the chest and abdominal wall of a person was developed. The proposed method was used to estimate volume parameters of breathing among men aged 20–22 years. BMI (body mass index) ranged from 18.2 to 30.1 kg/m². The research of volumetric parameters of respiration was carried out using the hardware-software complex and the proposed technique for registering the biomechanics of breathing. Conclusions about the relation between volumetric parameters of breathing and the values of changes in the overall dimensions of the chest and abdomen during respiration were drawn. A correlation-regression analysis of the volumes of inhaled/exhaled air and the values of deviations of the overall dimensions of the chest and abdomen was carried out. The results obtained indicate a strong relation between volumetric parameters of breathing and the values of deviations in the overall dimensions of the chest and abdomen.

A local thermal management solution for high electron mobility transistors based on GaN was developed using a BN layer as a heat-spreading element. The thermally conducting and electrically insulating nature of BN allows it to be placed close to the active area and to be in direct contact with the electrodes and the heat sink, thus introducing an additional heat-escaping route. The numerical simulations of a GaN high electron mobility transistor with the BN heat-spreading element revealed the improvement in the DC, breakdown, small-signal AC and transient characteristics. In case of sapphire substrate, the maximum temperature in the device structure operating at a power density of 3.3 W/mm was reduced by 82.4 °C, while the breakdown voltage at a gate-source voltage of 2 V was increased by 357 V. The cut-off frequency and the maximum oscillation frequency at a gate-source voltage of 6 V and a drain-source voltage of 30 V were enhanced by 1.38 and 1.49 times, respectively. We suppose that the proposed thermal management method can be adapted to other high-power devices.

To improve the efficiency of the onboard correlation-extremal tracking system in the presence of isomorphic transformations of the current object image (changes in the brightness level, scale, shift and rotation of the image), as well as natural and artificial noise during the observation process, a new method of adaptive formation of the reference image is proposed. It consists in using an Interactive Multiple Model (IMM), which includes Kalman filters of the 0th and 1st order and a Singer filter of the 0th order. The proposed method of adaptation is compared with the known methods of frame-by-frame change and “exponential smoothing”. To carry out comparative modeling of a mathematical modeling complex, in which an input action simulator based on the Unity3D cross-platform environment was used, taking into account the kinematics of the movement of ground objects and the flight of an unmanned aerial vehicle in a natural coordinate system. The effectiveness of the evaluation of the tracking of ground objects of each of the evaluations was estimated by the value of the average coefficient of tracking. The obtained research results can be used in the development of reconnaissance UAVs operating in real time.