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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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 helicopter main rotor. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. To determine the critical thickness, a series of calculations of natural frequencies and mode shapes as well as maxima static displacements and stresses of the flow separator was performed. PubDate: 2020-12-01
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 a need to use eddy-resolving approaches. PubDate: 2020-12-01
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 than 600 mm from high-strength aluminum alloys while preserving the profile cross-section parameters. PubDate: 2020-12-01
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 given. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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 and the results of its operation at complex trajectory simulation are presented. PubDate: 2020-12-01
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 types of solid propellant are presented and recommendation for required propellant volume is given. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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. PubDate: 2020-12-01
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