The features of polynomial codes application in the synthesis of built-in control circuits for combinational digital devices using Boolean complement method are described. The possibilities of accounting for the characteristics of error detection in information vectors by types (monotonic, symmetric and asymmetric) and multiplicities are considered. The main classes of polynomial codes focused on the detection of errors of a specific type and a certain multiplicity are presented. The conditions for the use of polynomial codes in the organization of built-in control circuits according to controllable groups of outputs of the original device are formulated. Examples of the implementation of built-in control circuits with the allocation of groups of device outputs that allow only one- and two-fold errors (Н2-groups of outputs) are given. A generalized algorithm for synthesizing built-in control circuits by Н2-groups of outputs is formulated.

The problem of constructing discrete bandpass and notch filters using impulse and transient characteristics of continuous analog filters of low and high frequencies is considered. A technique for the synthesis of tunable bandpass and notch filters with a constant width of the amplitude-frequency characteristics, regardless of the filter tuning frequency, is developed. The weight coefficients of the difference equations that determine the operation of discrete bandpass and notch filters with a constant width of the amplitude-frequency characteristics under conditions of a variable filter tuning frequency are found. The synthesis is based on the presentation of the mathematical frequency transfer function of the filter separately in the region of positive and negative frequencies, for each of which a bilinear z-transform is applied shifted to the tuning frequency of the selected region. The transfer functions in the z-plane of discrete filters are obtained separately for the regions of positive and negative frequencies. By summing and multiplying the transfer functions, the final transfer functions in the z-plane for discrete band pass and notch filters are obtained. By passing from the z-parameter to the jω parameter, expressions are obtained for the frequency transfer functions of the synthesized bandpass and notch filters. The amplitude-frequency characteristics of the synthesized filters are evaluated, and their width is shown to remain constant when the filter tuning frequency is changed. The developed technique is reported to be of use in building adaptive systems and signal processing devices, such as signal detection and filtering systems, Doppler velocity meters, and moving target selection systems.

Based on an algorithm for the formation of preferred pairs (PP) of Gordon — Mills — Welch (GMWP) sequences, a complete list is obtained of PP GMWP with a period N=1023, which have a five-level periodic cross-correlation function and different values of equivalent linear complexity, which acts as an indicator of structural secrecy pseudo-random sequences. The peculiarity of HMWR formation with period N=1023 is that for each basic M-sequences (MS), five HMWRs can be synthesized, while for periods N=63, N=255, N=511, only one HMWR can be constructed for each MS. There are 60 primitive polynomials in the GF(210) field, each of which can form ten PP MS. Structural secrecy of the GMWP with a period N=1023 is 2, 4, 8 times higher than the similar characteristic of the MS, which determines the preference for the use of the GMWP in digital information transmission systems, which are subject to increased requirements for noise immunity, confidentiality and secrecy.

Precision electric drive systems for robotic complexes are considered. Such systems are subject to increasingly stringent requirements for the permissible level of electromagnetic torque pulsations. At the same time, it is necessary to provide a wide range of speed control. These requirements cannot be satisfied only by improving the control algorithms, since the limiting factors are the range of output voltage regulation, as well as the pulsed nature of the voltage inverter operation. Reducing the level of output current and voltage ripples can be achieved by using multi-level inverter topologies that combine the properties of pulse-width and pulse-amplitude modulation, which is due to an increase in the number of output voltage levels. As an alternative to multi-level topologies, it is proposed to consider multi-phase inverter topologies, which are free from a number of disadvantages of traditional multi-level topologies and at the same time allow increasing the number of output voltage levels.

Optical laser-based rangefinders are considered, in which measurements are carried out not by the time of arrival of the pulse reflected from the object, but by convolution of the reflected and reference signals. The position of the resulting signal on the time axis determines the time of arrival of the reflected oscillations and the object distance. Due to the optimal processing of the received signal, the accuracy and the rangefinder performance increase.

The issue of improving a laser head housing design to ensure its portability with the account for capabilities of additive equipment, allowing to manufacture parts of the housing of high complexity out of plastic, is covered. Manufacturing the laser head housing of plastic makes it possible to reduce its material consumption as compared with housing made of aluminum alloy D16. It is proposed to further reduce the material consumption of the plastic housing by introducing special pockets and stiffening ribs into its design. A comparative analysis is performed in CAE-module of CAD/CAM-system SolidWorks to examine the strength and rigidity of the design options for the body, assembled from parts with the pockets and stiffeners, as well as without them. Results of modeling the deformation process show that it is possible to replace the material of aluminum alloy housing parts with plastic and that a decrease in material consumption and a change in the housing design do not lead to a loss of its strength and rigidity, which causes an unacceptable deviation of the laser beam from the vertical, i.e. does not affect the operation of the laser head. It is proposed to introduce such a laser head into a vertical machining center so that, along with traditional methods of processing workpieces from various materials, a wider range of different types of laser processing is available by cutting. This will allow not only to expand the technological and functional capabilities of such equipment with numerical control and reduce the time of production, but also to improve the technological, accuracy and functional characteristics of the manufactured product.

The actual problem of substantiating the general method for simultaneous evaluation of the linear and volumetric wear resistance of materials is solved with the account for constant and variable pressure on the sample. This makes it possible to assess the level of volumetric wear resistance in accordance with the standards of linear wear resistance.

An algorithm is developed to search for oil and gas deposits-analogues, based on clustering of Bayesian networks, built on parameters of the known deposits. Using Bayesian networks, it is possible to effectively represent oil and gas fields in the form of multivariate distributions, accounting for the complex relationships between the parameters. For each of the deposits in the database, a Bayesian network was built on a sample of its nearest neighbors obtained using the cosine distance metric. Clustering of the Bayesian networks built on the samples is performed by comparing the Hamming distance metric between adjacency matrices stretched into a one-dimensional vector. The developed approach is compared to other analogue search methods based on machine learning. Results of evaluation of the algorithm performance are presented, confirming that modeling and searching for analogues using Bayesian networks is a more comprehensive solution to the problem. The accuracy of restoring missing values for most parameters using the developed algorithm turned out to be higher than in existing classical clustering algorithms.