Abstract Results of studying the aerodynamic performance for a multipurpose medium lift helicopter model are presented. Both integrated and distributed aerodynamic performance of the model is presented along with flow distribution characteristics in the vicinity of the fuselage. The influence of two different rear fuselage geometries on the aerodynamic performance of the fuselage is discussed.

Abstract The results of numerical simulation at atmospheric pressure and air motion in the range of 40–1600 Reynolds numbers are presented. It makes possible to estimate aerodynamic losses during measuring the target impulse by the ballistic pendulum method. Results from numerical simulation are compared with experimental data.

Abstract The aerodynamic characteristics of three types of six-bladed main rotors are calculated on the basis of the nonlinear free vortex wake model. The vortex wake shapes and induced velocity fields in the rotors jet are analyzed. The figure of merit (FoM) diagrams are received.

Abstract The paper evaluates the effectiveness of using the predictive information display means allowing us to suppress the effects of a hazardous meteorological phenomenon known as a microburst. Mathematical models of a microburst and aircraft interaction with a microburst were developed. Experimental research using a flight simulator was carried out.

Abstract A technique is presented for calculating the main parameters along the flame tube length in the combustor with combustion of premixed air–fuel mixtures. The calculation in the combustion zone is carried out by numerical solution of the system of equations based on the well-known brutto reaction equation of material balance for a homogeneous reactor.

Abstract Results of the aerodynamic coefficients imitation of wing airfoils and helicopter blades are presented. The modeling is carried out using the artificial neural network algorithms. The dependencies of the lift coefficient and the drag coefficient on the angle of attack are imitated for various airfoil geometries.

Abstract This paper proposes an analytical description of the geometry of the fuselage model of a promising high-speed helicopter, aerodynamic characteristics of which will be obtained further using numerical and physical modeling.

Abstract In the paper the high-speed architecture of built-in self test (BIST) for double data rate synchronous dynamic random access memory (DDR SDRAM) is proposed. The BIST proposed can make self testing at its operating frequency that improves the reliability of the results obtained.

Abstract The paper describes the development and implementation of a mobile landing platform control system. Tests were undertaken in laboratory conditions. The neural network approach being applied in the control system provided an accuracy of finding coordinates and showed a high speed of response in taking decisions for tracking small unmanned aerial vehicles by a robotized platform.

Abstract The paper describes an up-to-date approach to searching for an optimal blade shape for the airplane propeller while considering geometric and technological restrictions. This approach uses the advanced parametric optimization methods. The paper shows an application of the approach developed to obtain an optimal aerodynamic blade shape for different engine operation modes.

Abstract A numerical simulation of the flow induced by rotation of the ducted fan blades of a quadcopter is carried out using the vortex-resolving approach that assumes solution of the full Navier–Stokes equations. Based on the numerical simulation results, the aerodynamic characteristics of the ducted fan are determined in various flight modes with asymmetric airflow over the surface swept by the

Abstract The problem of maximum flight range for the gliding unmanned aircraft is investigated taking into account the key characteristic of this type of aircraft, namely, the absence of the propulsion. An algorithm of optimal control is created through the direct method of optimization that is based on the Galerkin method.

Abstract In this paper, the influence of the diffusion coefficient in the transport equation of the mass fractions is studied. The solution of the Favre-averaged equations of a chemically reacting mixture of fuel components and combustion products is applied. The simulation results show good agreement with the experiment.

Abstract The model being suggested dwells on the process of radiation power being converted into electrical power in a photodetector. The paper includes a comparison between two different variations of the model of the photodetector radiation sensor as well as the frequency characteristics of the system.

Abstract Advanced methods of computational fluid dynamics are used for quasi steady estimation of the effect caused by injection of ablation products of a heat shield protecting a submerged contoured nozzle on discharge characteristics of the engine. Limits of discharge coefficient variation are determined depending on the injection intensity of degradation products and flow stagnation parameters that

Abstract Recommendations are obtained for prediction of heat transfer coefficients and critical heat fluxes according to experimental data available in literature for boiling of different liquids on microstructured surfaces made by deformed cutting method.

Abstract The paper addresses the main long-standing approaches to the development of marine gas turbine engines and propulsion plants as well as prospective lines in their development. The paper presents the results of UEC-Saturn work in the field of designing and engineering facilities development for marine gas turbine manufacturing in Russia. The key issues of converting aircraft gas turbine engines

Abstract A control system of permanent magnet synchronous motor ensuring its fail-safety at the expense of switchover between several scalar control modes, is proposed. A computer simulation model is realized. The operation of such a system is analyzed in terms of the electric pump unit of space application.

Abstract Laser coordinate measuring systems are considered. A set of internal and external factors affecting the accuracy of measurements of the object geometric parameters is analyzed. In a number of cases, relations are given to estimate the measurement error. The dependence is proposed to determine the total error.

Abstract The obtaining of gas turbine engine mathematical models from experimental data with identification or refinement of their unit characteristics and the use of such models in parametric diagnostics methods is considered. The solution of improperly posed problems, where the number of equations is not equal to the number of unknowns, is proposed to be solved by a mathematical method specially

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.