No. 10

A study of a non-contact aerohydrodynamic viscometer sensitivity to influencing quantities

The operational principle of a non-contact aerohydrodynamic device for measuring the viscosity of liquids is described. A theoretical analysis and a classification of the quantities that affect the accuracy of viscosity measurements are carried out. The results of experimental studies of the viscometer sensitivity are obtained for the following influencing quantities: the pressure P in front of the gas jet outlet, the predetermined value x₀ of the liquid surface deformation, the distance H between the outlet and the liquid surface, the temperatures T_l of the liquid and T₀ of the environment, the angles α₀ and θof the viscometer inclination in mutually perpendicular vertical planes. Rational values of pressure P = 5.4 kPa and distance x₀ = 20.5 mm at jet inclination angle α = 20° are chosen.

Keywords: non-contact viscometer, viscosity, gas, liquid, measurement, surface, jet.

Vibrating plate viscosity measurement method for high-temperature materials

A new oscillating-plate type viscometer, which makes instant and continuous viscosity measurement possible for high-temperature material is developed and utilized. This viscometer is designed for industrial use, and viscosity can be measured automatically with high accuracy and easy operation. The measured viscosity value is evaluated using mold flux in the continuous casting process. It is verified that proper control of viscosity and primary crystallization temperature for mold flux yields good casting products of good quality and prevents troubles in casting. This method of viscosity measurement is currently used in various areas such as the examination of newly received mold flux, the selection of optimum fluidity characteristics for various casting conditions, and the development and improvement of mold flux.

Keywords: viscosity, mold flux, oscillating-plate type viscometer, high temperature, primary crystallization temperature.

The synthesis technique of the computer vision-based navigation system

The article describes the synthesis technique of the navigation system using a computer vision. A special feature of the proposed approach is a combination of SLAM and correlation-extreme visual navigation in the unified image processing algorithm. The article depicts the methodology and results of simulation modeling, highlights the fundamental performance of the synthesized navigation algorithm and presents the achievable navigation solution accuracy levels depending on the given conditions. Some limitations and bypass ways are noted.

Keywords: computer vision, autonomous navigation system, SLAM, correlation-extreme visual navigation system, Kalman filter.

Development of a smart home circuit based on a module for monitoring and controlling the state of elements of automation systems of industrial facilities

The article discusses the development of a smart home and the principle of connecting devices to the automation panel to be able to control them through a mobile application. Schemes for connecting devices to a smart home have been developed. The layout of the devices in the apartment is presented, as well as the setting of automatic scenarios to increase the comfort and safety of residents is explained.

Keywords: control module, smart home, sensors, circuit, converter, contactors, automation, system.

Control of the lens for aerial photography by an experimental installation based on the Linnik interferometer

The paper the control of the lens for aerial photography by an experimental installation based on the Linnik interferometer is presented. Optical and optoelectronic devices and complexes are constantly being improved and the changes in the wavefront of optical systems and elements should not exceed tenths, and sometimes hundredths of the wavelength of radiation, therefore, the study of the lens for aerial photography is promising and relevant. The paper the goal and objectives, the method and object of research are set and defined. The appearance and optical scheme of the interference experimental setup are given, as well as technical characteristics are given. An interferogram on the Linnik interferometer, where a wave diffracted on the hole is used as a reference wavefront was obtained. The program processed an interferogram, where the processing on a series of mathematical methods for interpreting functions, the purpose of which is to obtain a reliable decomposition of the deviation of the wavefront and the surface by Zernike polynomials were based.

Keywords: interferometry, lens, span, standard deviation, radiation wavelength, aberration, wavefront, optical system.

Modern concept of measurement technology implementation for aircraft operation support

Assessment of the technical condition, monitoring, diagnostics of complex technical systems are currently one of the main tasks in ensuring the efficient operation of engineering facilities, in construction, energy and transport.

Structurally, helicopters are one of the most complex aircraft. Helicopter technology developers are constantly working to improve the flight performance of the aircraft, increasing its payload, maneuverability and combat effectiveness. However, all these improvements are often achieved by significantly increasing the loads on the power elements of the structure, tightening the operating modes of units, systems and equipment.

The materials present modern achievements in the field of diagnostics of complex technological systems of helicopters. The analysis of the main modern developments in the field of forecasting and prevention of accidents and catastrophes is given. The concept of measuring technology for the maintenance of the life cycle of an aircraft transmission based on the phase-chronometric approach is proposed, and the results of the practical use of this concept are also presented.

Keywords: life cycle, measuring technology, control, measurement, phasochronometric method, helicopter, transmission, vibration diagnostics.

Invariant automated system for measuring the flow rate and quantity of wet gas with additional channel

The article deals with the problem of modeling a method for measuring the flow rate of wet gas using a combination of invariance theory and a positive displacement method for measuring gas flow rate. To improve and reduce the cost of invariant systems for measuring the flow rate of wet gas, a structure containing a positive displacement flow meter for measuring the flow rate of dried gas is proposed. The paper describes in detail the structure of the invariant gas flow measurement system, its properties and features obtained based on the application of the positive displacement method of measuring the gas flow rate. In the work, models of uncertainties for measuring the dry part of the gas flow rate and the moisture flow rate in the gas composition are obtained. The authors of the article performed an analysis of the uncertainties of flow measurement by studying all the influencing factors to increase the accuracy of measurements. The paper shows that the uncertainty of the dry part of the gas flow rate is most strongly influenced by flow meters installed in the main and bypass pipelines of the system, which are used as the multichannel structure. The obtained research results of this measurement system are of interest for natural gas production, transportation, and storage facilities.

Keywords: wet gas flow rate, invariance theory, multichannel principle, positive displacement meter, flow measurement system.