Abstract The relevance of development of multifunction air pressure sensors of aircraft aerometric systems for air signal measurement is justified. Analytical models of formation of total and static pressures and pressures for obtaining the information about the aerodynamic incidence and slip angles of the axisymmetric multifunction air pressure sensor are obtained. The analytical model is synthesized

Abstract The paper considers the hybrid intellectualization that is attained through a two-level metasystem dividing the area of production tasks into a large number of zones, in each of which special knowledge is concentrated. An intellectual problem has been solved, for which up to seven intelligent technologies are involved in parallel or in series that makes it possible to increase the multidimensionality

Abstract This paper describes a special method for managing the route of an unmanned aerial vehicle and a complex for implementing it. The idea behind the methodology being proposed is to ensure the safe movement of helicopter-type unmanned aerial vehicles intended for use on preset routes at a specific facility.

Abstract The results of experimental studies on the determination of mechanical properties of carbon fiber reinforced polymer specimens produced by tailored fiber placement (TFP), tufting, and radial braiding are presented. A comparative assessment of their properties, obtained in the course of static, impact and post impact tests, is provided.

Abstract The influence of the turbulent speed of flame propagation on the indicated characteristics of the aircraft piston engine is investigated. It was revealed that an increase of the flame speed contributes to a decrease of fuel consumption, an increase of efficiency and power of the engine.

Abstract The paper describes an information system that provides the cost reduction for development of design documentation for unified and reusable containers for nonstandard large-sized aircraft units and panels.

Abstract On the basis of an analytical and experimental study of the thermal physics of face plunge-cut grinding of the heat-resistant KhN77TYuR alloy, the influence of the main technological parameters of the grinding process on the temperature and residual stresses being formed in the surface layer of the workpieces was established.

Abstract Average heat transfer in a turbulent flow on a plate with a system of double-cavity diffuser-type dimples is studied experimentally. The regime of turbulent flow almost reproduces the airflow in a cooling system of a turbine blade. Physical and numerical simulation of flow in a double-cavity diffuser-type dimple is performed. Two self-organizing vortices emerging in the dimple were documented

Abstract Vertical axisymmetric vibrations of a vessel with a liquid, separated by a porous partition, are considered. The damping of vibrations caused by the presence of a porous partition is studied experimentally. The integral value of the reduced damping coefficient of the system is obtained.

Abstract Parametric investigations of impeller blade geometry of a centrifugal compressor are carried out. The influence of the tip clearance on the compressor characteristics is studied in order to increase its efficiency. The effect of the size ratios of various impellers on the compressor efficiency is investigated, and their characteristics are compared.

Abstract The paper presents the results of the combustion chamber computer-aided design for the AL-31F aircraft engine and the AL-31ST ground power plant using the AM expert system. A comparison of materials selected by the expert system with those used in a real structure, is performed.

Abstract A predictive approach to solving a set of problems in improvement of the aircraft technical maintenance process organization is considered. The solution to this problem is based on the structure of methodological support for information management of the processes of aircraft technical maintenance, taking into account the content of the database of information flows and the general scheme

Abstract For the heat exchange verification, the averaged behavior of heat transfer in the vortex matrices with a channel wedging angle of 4.5 deg is compared with the results obtained in the experimental conditions of zinc thermostat. As a result of 3D calculation in the ANSYS CFX, the local heat transfer coefficients and hydrodynamics behavior are obtained for the vortex matrix models when the wedging

Abstract The paper describes in detail the design process of an air brake developed on the base of the existing low-pressure compressor of the aircraft gas turbine engine for power utilization during gas turbine plant tests by compressing the working fluid in the compressor.

Abstract In this paper, the analysis of the existing methods for testing the turbine discs by imitation modeling is performed. The requirements for the geometry of the imitation model for gas turbine engine disc are determined. Variants of geometry and methods of loading for imitation models are proposed and investigated. The optimal method for modeling the critical stress concentration region in the

Abstract The nonstationary problem of thermal conductivity in a two-layer thermal protection coating is under consideration. The solution is given for a metal hemispherical shell with axisymmetrical distribution of the heat flux density over the outer surface of the coating.

Abstract The technique of neural network modeling of thermal-hydraulic efficiency in the surface intensification of heat exchange equipment is presented. The results of neural network modeling for various surface intensifiers are obtained. Data from experimental studies were used to train an artificial neural network.

Abstract This paper presents the theoretically and practically grounded methods for aerodynamic compensation of aeroelastic divergence of a forward-swept wing. A special attention is paid to the discovered generation of a normally bound tornado-like vortex. Numerical research of separated flow morphology as well as lifting properties of the system are confirmed by a natural experiment in the wind tunnel

Abstract The physical principles of operation and the technical characteristics are considered for the hydro acoustic wave recorder, which is the means for measuring the hydro conditions in the seadrome water area and can record the confused sea parameters for a long time with high accuracy, reliability, and stability.

Abstract The analysis of the short-circuit current and open-circuit voltage performed for solar arrays of satellites operating in medium earth orbit reflects the essential exceeding the short-circuit current degradation rate over the open-circuit voltage degradation rate. The study demonstrated also that there is another factor of non-radiation degradation resulted in additional degradation of the

An Erratum to this paper has been published: https://doi.org/10.3103/S1068799820040315

Abstract A brief overview of the noise generation mechanisms of piston engines is given. The spectral, energy, and spatial characteristics of the sound field are considered for engines used in aviation as a part of the power plants of light aircraft and unmanned aerial vehicles.

Abstract The paper investigates the swirling flow behind the GTE combustion chamber swirler with blades installed under different angles. The mixing ratio in the flow is experimentally analyzed and compared with the estimated values obtained by a numerical approach and using various models of turbulent viscosity.

Abstract A general method using a radiophotonic system for measuring blade deformations of a helicopter main rotor model is presented. Characteristics of this system are considered and a comparison is carried out to other similar approaches with different operating principles. A proposition is formulated describing the applicability of a radiophotonic system for measuring blade deformations of a full-scale

Abstract The purpose of this work was to create a three-dimensional two-phase numerical model of the laser cladding process with titanium powder on a titanium substrate. A comparison was made with a previously developed two-dimensional numerical model.

Abstract The paper considers the problem of increasing the safety of landing for small unmanned aerial vehicles under unfavorable external conditions, in particular, in the presence of gusty crosswind. A mathematical model describing the landing of a small unmanned aerial vehicle in the presence of aerodynamic flows and the stabilization in the XY plane is presented.

Abstract Through the study of uneven deformation under the action of radial forces in DEFORM-3D finite element simulation environment, a method of fixing a thin-walled cylinder during honing with an elastic cuff and axial tensile force was investigated. The conditions for increasing the accuracy of honing the holes of thin-walled cylinders were determined.

Abstract To assess the reliability of parts made of polymer composite materials when sand and dust enter the compressor during take-off and landing, a periodic measurement of the part thickness during aircraft parking is proposed. The criterion is based on checking the permissible level of static stresses and natural frequencies when the thickness of the composite part of the flow separator is decreased

Abstract The paper analyzes the problem of the operation of an unmanned aerial vehicle with ducted fan propulsors in hovering mode over a flat landing platform. Numerical calculations of gas dynamics were carried out using the traditional approach to turbulence simulation based on averaged Navier–Stokes equations and using the eddy-resolving method of large eddies. The results obtained which confirm

Abstract The technology of bending–rolling in rollers of shaped aircraft parts is proposed and implemented by the pilot straightening–bending installation in AO Ulyanovsk NIAT. Experimental results are presented for research of longitudinal bending of aircraft part blanks made of formed sections. The data obtained demonstrates the possibility of obtaining the workpieces with a radius of curvature less

Abstract The paper considers the indirect measurement of disturbance based on the output parameters of the control object using its mathematical model and the disturbance compensation in order to improve the automatic control system noise resistance. The method proposed is applied to aircraft attitude motion control systems. The issues of such systems synthesis are considered. Modeling results are

Abstract The paper describes the results of the experimental study of destruction of the foil gas dynamic bearing for a rotor of the gas turbine power plant. An analysis of temperature field, displacement and torque in the bearing was performed depending on the load and at the moment of destruction. The ultimate bearing capacity and the range of stable operation were determined.

Abstract The paper presents the experimental data for a light boxplane obtained in the T-1 wind tunnel (MAI, Moscow). Directions for future research are assigned.

Abstract A new adaptive algorithm for multistep terminal control (MSTC) of a soft landing of an unmanned return spacecraft (URS) is proposed that is based on more accurate analytical solutions of differential equations with identification of real parameters of the URS and the atmosphere.

Abstract The theoretical dependences of the circumferential efficiency, gas flow rate, thermodynamic degree of reactivity, torque and power on the turbine rotation frequency (circumferential speed) are obtained for the first time. The results obtained can be used in the design of the Segner wheel-based turbine drives.

Abstract The way of small aircraft strapdown inertial navigation system transfer alignment based on information from the carrier navigation system is considered. Optimal Kalman filter was selected as the main mathematical technique for the proposed method implementation, which showed acceptable accuracy and convergence time in the set task conditions. The main features of SINS transfer alignment algorithm

Abstract A possible design scheme of a lunar reactive penetrator is considered that is able to penetrate into regolith and deliver the scientific equipment to a specified point of the ground volume. The dependences connecting the main design parameters are given. They allow estimating the principal possibility of movement in the ground. Three options for calculating the penetrator model with different

Abstract We consider the problem about estimating the probability of an aircraft successful landing. Using the previously obtained mathematical results, we propose a scheme for estimating the desired probability and the error of this estimate. We present the results of calculations.

Abstract A dynamic model of the deployment of the large-sized transformable space structures (by the example of solar panels) is proposed. The model is based on using the Lagrange equations of the second kind. The model capabilities are illustrated by calculation results of the main integral parameters characterizing the solar panel deployment process.

Abstract Theoretical calculations and experimental studies were carried out making it possible to predict the maximum value of reversible deformation of a composite material based on a polymer matrix reinforced with titanium nickelide fibers.

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Abstract The results are presented of the experimental and computational studies of the flame stabilization behind a swirler in an open flow and in a model compartment of the combustion chamber. Using the thermal theory, the calculation model of the flame stabilization in the combustion chamber is developed. Using this model, the calculation is carried out and the calculated and experimental data are

Abstract The distribution of magnetic induction in the working gap of an alternating current machine with enhanced power performance is investigated. The efficiency of the machine winding proposed is analyzed. The results obtained by the analytical and software methods are compared.

Abstract The paper considers the use of combined radio wave and thermal methods to test the process of carbon-containing composite recovery by thermal cryo shock in a laboratory environment.

Abstract The paper analyzes the possibilities of using the thermionic cooling methods that significantly reduce the temperature and temperature stresses in the elements and structures of aircraft, increasing the life of thermally loaded elements and flight safety. We estimate the range of altitudes and flight speeds of aircraft at which the practical implementation of thermionic cooling is possible