No. 3

Application of a neural network in the synthesis of the speed regulator in building a speed controller in asynchronous electric drive system for mobile robots

The article discusses the use of a speed controller based on a neural network in an asynchronous electric drive of a mobile robot with a vector control system. The results of computer simulation of a vector control system with PI controller and NARMA-L2 neural network controller are presented. It has been established that the use of neural networks can improve the dynamic characteristics of the electric drive.

Keywords: neural networks, asynchronous motor, vector control, speed controller, electric drive, mobile robot.

Development of a technique for reducing the maximum loads on the control surface drives of transport category aircraft based on experimental data obtained as a result of flight tests

An assessment is made of the values of the maximum hinge moments of the aircraft controls (ailerons, elevators and rudders, spoilers, brake flaps). Formulation of a list of design cases for determining the maximum values of hinge moments of controls and their subsequent correction based on the results of flight tests.

Keywords: hinge moment, steering gear, civil aircraft, load reduction, load cell, bank of aerodynamic characteristics.

Modeling of thermal processes during vulcanization of multilayer rubber products

The graphical interface of the software for modeling thermal processes implemented during the vulcanization of multilayer rubber products has been developed, which will avoid the time spent on conducting experimental studies when introducing new types of rubbers. The program includes a module designed to accumulate statistical data, allowing the user to increase the knowledge base of experimental data.

Keywords: mathematical modeling, rubber vulcanization process; thermophysical characteristics, multilayer rubber products, software solution.

Cold spray formation of effective heat transfer surfaces of annular turbulators

The additive technology based on the cold spray method to form the annular turbulators inside the pipe segment is considered, providing the effective heat transfer surface with a given profile. We consider a controlled movement of a pipe segment relative to a circular spraying nozzle of a heterogeneous flow that forms the annular turbulator surface with a given profile in order to increase the efficiency of ohmic heating of the gas flow. Annular turbulators and protective layer are formed at once.

Keywords: heterogeneous flows, protective coatings, annular turbulators, cold spay method, ohmic heater, surface profiles, efficient heat transfer.

About the implementation of verified credentials (VC) and decentralized identifiers (DID) in the authentication system

This article reviews the main and mostly used authorization protocols. It describes the identity framework, Self-Sovereign Identity (SSI) and its most widely used implementation standards, such as Verifiable Credentials (VC) and Decentralized Identifiers (DIDs). Options for implementing these standards in the existing implementation of the protocols are presented.

Keywords: self-sovereign identity, verifiable credentials, decentralized identities.

Metrological support of industry at the present stage and current tasks of marine instrumentation

The problematic issues of metrological support of industrial enterprises are analyzed. The structure of problematic issues at the current stage of development of domestic industrial production, including in marine instrumentation, is proposed. The consequences of the adopted organizational and technical decisions are discussed. The possibilities of overcoming the difficulties encountered are shown..

Keywords: metrological support, marine instrumentation, actual problems.

Mathematical model of data processing from analog switch control and measuring devices

The task of automation is always urgent in any technological production. Most often optimization of production process occurs due to introduction of new digital, computer, information technologies or adaptation of production system for them. Since all technologies are inextricably linked to the physical laws, the functionality of each may be described by the corresponding mathematical model.

It is the stage of drawing up a mathematical algorithm of work is often the first in solving any technological problem. In this article we propose a mathematical model for solving the problem of fixing and processing data from analog control-measuring devices (CMD). As a digital technology is considered the use of computer vision, in this case the optical camera is defined as a full-fledged data recording device. Considering the specifics of work of switches measuring devices, the proposed mathematical model is based on the theory of higher mathematics section, analytical geometry, describing geometric objects using methods of algebra and mathematical analysis.

Keywords: control-measuring devices (CMD), measuring devices, mathematical model, digital technologies, computer vision, measurements.

Improving the efficiency of signal conditioning circuits of the airflow heat sensors

The problem of practical implementation and improvement of efficiency of signal conditioning circuits of calorimetric and thermoanemometric MEMS sensors for the speed of air and gas flows are considered. A variant of the implementation of an adaptive signal conditioning circuit with digital control is proposed.

Keywords: airflow sensor, calorimetric sensor, thermoanemometric sensor, signal conditioning circuits, adaptive signal conditioning circuit.