CONTENTS #8 – 9 (August – September) 2022
Mathematical Modeling of Aerodynamic Compatibility of Helicopter and Cargo (p. 3 – 10)
A.N. Detkov, A.M. Baranov, S.E. Kamarentsev
The analysis of aerodynamic interference of the cargo placed on the external suspension unit under the wing console of the helicopter is carried out. It is shown that the aerodynamic interference of the load and the external suspension unit can significantly affect the safety of helicopter operation. The problem is solved by means of gas dynamic analysis and solid-state modeling software packages. The research results make it possible to create favorable conditions for the separation of suspended loads from the design of the external suspension unit of the helicopter.
Keywords: aerodynamic interference; helicopter with cargo on an external suspension; solid-state modeling; gas dynamic analysis.
Directions of Modernization of the Automated Control System for Firing Tests of Liquid-Propellant Rocket Engines at the Stand No. 1 OP «Vintai» PAO «ODK-Kuznetsov» (p. 11 – 25)
V.A. Karpovskiy, V.A. Liseykin, I.A. Tozhokin, M.N. Churin, A.G. Skryabyshev
The main directions of modernization of the automated control system of stand No. 1 OP "Vintai" of PAO "ODK-Kuznetsov" are considered.
Keywords: supervisory control and data acquisition system; emergency protection system; bench firing tests of liquid-propellant rocket engines.
Methods and Means for Conducting Semi-Natural Modeling of Aircraft Control Processes on a Special Stand (p. 26 – 34)
N.N. Sukhykh, V.L. Rukavishnikov
Research stands and modeling complexes are an important tool for the design and research of semi-automatic systems. The use of analytical methods allows, taking into account the "vagueness" of the pilot's description, only to roughly determine the structure and basic parameters of the systems. Their clarification is given in the process of experimental research.
Keywords: research stands; modeling complexes; semi-natural modeling; digital-to-analog; aircraft control.
Optimal Radiometric Correction of Remote Sensing Results Using Unmanned Aerial Vehicles (p. 35 – 39)
P.R. Zulfugarly, I.H. Abdurrakhmanova
The article is devoted to the optimal correction of data obtained from unmanned aerial vehicles of the reconnaissance type. The problem of optimal radiometric correction of remote sensing results is formulated in conditions when such indicators of the Sun as the zenith angle and azimuth angle change slightly. The aim of the study is to achieve the maximum value of the signal–to-noise integral indicator by selecting the control function in the form of the dependence of the zenith angle of the drone sensor on the cosine of the relative azimuth angle. Optimization of the specified integral as an objective function showed that its maximum is achieved in the presence of a linear increasing dependence of the zenith angle on the specified argument.
Keywords: unmanned aerial vehicle; remote sensing; optimization; control function; zenith angle.
Optimization of Centralized, Hierarchical and Leading Operator Controls of a Group of Distributed Unmanned Aerial Vehicles (p. 40 – 62)
Currently, robotic complexes and systems of various bases, including unmanned aerial vehicles, are actively used to solve civil and dual-use tasks. To fulfill the tasks assigned, each robotic system is equipped with a set of target loads, the technical characteristics of which directly affect the success of the mission as a whole. In order to ensure the solution of complex and spatially distributed technical tasks, it may be necessary to use not one unmanned aerial vehicle, but an entire group. At the same time, within the group, unmanned aerial vehicles must interact in a certain way, ensuring the required mutual coordination and without violating the order of battle. Within the framework of this article, the issues of optimization of operator control of a group of distributed unmanned aerial vehicles with different ways of organizing their construction and management within the group are considered.
Keywords: robotic complexes; unmanned aerial vehicles; on-board control system; operator; group flight; optimization; hierarchical control; centralized control; leading control; flight path.
Method for Selecting Design Parameters for Reusable Launch Vehicles (p. 63 – 69)
A.A. Zolotov, V.V. Rodchenko, E.V. Gusev
The article discusses the features of the choice of design solutions for reusable launch vehicles. On the basis of a feasibility study, a methodology is proposed that allows justifying the service life of reusable onboard systems and the optimal design parameters of the carrier, which ensure the satisfaction of reliability requirements at minimal cost. The performance of the presented approaches is illustrated by specific examples.
Keywords: reliability; resource; cost; reusable transport rocket and space systems.
System of Internal Heating and Cooling of Stands for Life Tests of Supersonic Passenger Aircraft (p. 70 – 77)
A.N. Serioznov, V.I. Sabelnikov, D.A. Shinkarev
Schematic solutions for an internal heating-cooling system for bench life tests of supersonic passenger aircraft using a fuel simulator are proposed. Their analysis was carried out taking into account the requirements for reducing the testing time and the reliability of the reproduction of flight loads. The results of experimental studies are considered. Technical solutions have been developed that makes it possible to carry out forced tests.
Keywords: strength laboratory; supersonic business and passenger aircraft; thermal strength tests; internal heating-cooling system; design and experimental studies.
Issues of Optimizing the Flight of Drones Launched from High-Altitude (p. 78 – 82)
F.G. Agayev, H.H. Asadov, A.B. Aslanova
The flight conditions of drones launched from high-altitude aircraft are analyzed. The procedure for optimizing the modes of operation of hydrogen fuel cells installed on such unmanned aerial vehicles is described. The model identity of temperature-dependent modes of operation of hydrogen fuel cells installed on drones is investigated. The drone launch mode is considered, where the drone can fly along equivalent trajectories. An altitude-temperature model of a hydrogen cell has been developed in relation to the considered equivalent flight paths. Based on the altitude-temperature model and the well-known Nernst equation, a theorem is proved according to which the laws of change in the amount of H2 and O2 depending on the temperature of the cell in the optimal mode of functioning of the hydrogen cell are completely identical.
Keywords: drone; hydrogen fuel cell; flight path; model; optimization.
Calculation Investigations of Heavy Transport Airplane Flow Parameters on the Basis of Numerical Solutions of Navier – Stokes Equations (p. 83 – 89)
V.V. Vozhdaev, A.A. Krutov, E.A. Pigusov
On the basis of numerical solutions of the Reynolds averaged Navier-Stokes equations the parameters of the flow around a model and aerodynamic characteristics of a heavy transport aircraft are calculated. A comparative analysis of the calculated and experimental data has been carried out. It is shown that the used computational technique makes it possible to obtain the aerodynamic characteristics of a complex configuration aircraft with a good accuracy.
Keywords: computational fluid dynamics; Navier – Stokes equations; computational grid; boundary layer; aerodynamic performance.
Possibility of Using Orbital Solar Reflectors in order to Increase the Efficiency of Terrestrial Solar Power Plants (overview) (p. 90 – 98)
V.K. Sysoev, A.D. Yudin
The development of ground-based solar power plants has made it possible to increase the capacity of "green" energy. However, such power plants have a daily cycle (day/night), which reduces their efficiency. Increasing the efficiency of ground-based solar power plants is possible with the help of orbital space solarreflectors. The article analyzes the possibility of increasing the efficiency of solar power plants, prov ides options for orbits and designs of space solar reflectors.
Keywords: ground-based solar power plant; orbital solar reflector.