Georgy Shcheglov

• Sc.D.
• Professor (Full) at Bauman Moscow State Technical University

Subject. The article considers the formation of the space logistics ecosystem. Objectives. The aim is to describe the ways of developing the rocket and space technology, searching and attracting funds from private investors for the space logistics ecosystem and the commercial segment of space services. Methods. To explore the process of space logis...

Subject. The article investigates the process of formation of the commercial space services market. Objectives. The requirement to develop the commercial segment of space services is driven by the emergence of new space technologies, the need for deep space exploration and attraction of funds from private investors. Methods. We employ the consisten...

The paper presents technique for evaluating design parameters of a satellite constellation operating on the Internet-of-Things principle and making it possible to determine the impact on the constellation general design parameters on characteristics of the fifth generation 5G communication technology used in data transmission between spacecraft, as...

The paper considers possibility of using a new depreciation scheme in regard to the wheeled three-column landing gear leg of the aerospace light aircraft based on using the three-section one-time crash box, which could be replaced during the inter-flight maintenance. Normal and abnormal operation of the landing gear legs was numerically simulated i...

The geometric interpretation of quaternions is considered. The visualization complexity of quaternions is due to the fact that these objects have four independent parameters. A literature analysis shows that the problem of geometric interpretation of quaternions has not been completely solved to date. The first section provides general provisions o...

The geometric interpretation of quaternions is considered. The visualization complexity of quaternions is due to the fact that these objects have four independent parameters. A literature analysis shows that the problem of geometric interpretation of quaternions has not been completely solved to date. The first section provides general provisions o...

The paper considers the selection of a main propulsion system of a small space tug, whose development is relevant due to the problem of disproportion between the existing launch vehicles and promising payloads. This problem arose in connection with the active development of multi-satellite constellations. The tendency to increase the number of oper...

This paper is concerned with the equation for the evolution of vorticity in a viscous incom-pressible fluid, for which approximate weak solutions are sought in the class of vortex filaments. In accordance with the Helmholtz theorem, a system of vortex filaments that is transferred by the flow of an ideal barotropic fluid is an exact solution to the...

This paper presents the results of the flow rate characteristics study of the new design liquid flow valve. Data were obtained using finite volume numerical simulation in the OpenFOAM package of the spatial flow of liquid in the flow part of the valve. A simplified quasi-static approach was used, which allowed obtaining results at low-cost computin...

The paper focuses on the problem of the ballistic design of a two-stage launch vehicle for the case when the payload fairing is returned by using its flaps as the lifting surfaces of the first-stage reusable boosters. The fairing flaps must be opened after the velocity pressure reaches its maximum value. Therefore, the trajectory in the operation s...

A design aspect of a three-dimensional workspace for an upcoming deployment stage of a new-generation manned space station with crews of several dozen people is considered. It is assumed that in the new closed layout of the station, the spatial core is its courtyard, which ensures productive and safe human activity not only in pressurized living an...

The paper considers a new layout of a two-stage spacecraft designed to remove a group of large space debris objects such as the upper stages of ‘Zenit’ launch vehicles from low-earth orbit. The aim of the work is to preliminarily quantify the parameters of the shock-absorbing system of the robotic arm designed for capturing a redundant upper stage...

The modes of small oscillations are studied in a rod having an axis in the shape of a three-turn cylindrical helix using the expansion into oscillating eigenmodes and the method of vortex elements. Oscillationós are excited by pressure pulsations generated as a result of the processes of intense vortex formation when a spatial incompressible flow f...

This paper solves a simple 3-DOF harmonic oscillator problem and determines the instability conditions. The calculated parameters and the corresponding roots of the characteristic equation are compared against numerical results obtained using a method of estimating the influence of design parameters of the automatic control system on the stability...

The description of a new type of training activities "Computational - graphic practice", aimed at consolidating the knowledge and skills acquired by students in the study of basic engineering disciplines and bridging the gap in training students in the field of life cycle information support technologies, is presented. The goals, objectives and pro...

A new aspect of human space exploration is considered - the production of information in space. Such production can be presented as a new type of territorial-production complex, that implements the infocommunicational energo-production cycle. A high-performance computing cluster and communications equipment are the load of a space-based solar power...

Analysis of the dynamics of the vibration-driven planetary rover is considered. Numerical simulation using ADAMS MBD software shown that it is fundamentally possible to create a Venus rover with internal moving mass that will be able to move along the surface with the required average speed 0.16 m/s for a certain time. When operating on the surface...

Considered a proposal to combat global warming, which consists in placing the creation of information in near-earth space. It is shown that instead of a space solar power plant that transmits energy to terrestrial consumers, it is more profitable to organize an orbital territorial-production complex, in which a new information and communications en...

The paper focuses on a new layout diagram of a two-stage disposal spacecraft intended for the removal of a group of large space debris objects ― the upper stages of Zenit-type launch vehicles ― from the low earth orbits to the disposal orbits. A distinctive feature of the spacecraft is one multi-joint telescopic manipulator used for capturing an ob...

Analysis of the efficiency of two basic strategies for de/re-orbiting large space debris objects to disposal orbits (DO) is given. Large objects in LEO are classified into groups with similar orbital inclinations and comprise primarily last stages of launch vehicles, in GEO vicinity the paper studies upper stages. Under the first de/re-orbiting var...

A new approach is developed for the no-slip boundary condition in vortex methods. The procedure of double layer potential density reconstruction is considered, which consist of two steps. Firstly the integral equation with respect to vortex sheet intensity is solved, which expresses the equality between the tangential components of flow velocity li...

The paper describes spacecraft landing on a landing gear consisting of four crash legs supported by beam struts. The first part is dedicated to verification of low dimension shell finite element model parameters in the MSC Nastran SOL700 software. An elastoplastic crushing test problem of square aluminum specimens with various thickness is simulate...

In this paper, a new approach is developed for the computation of vortex sheet intensity in vortex methods for 3D flow simulation. The problem is reduced to a boundary integral equation of the second kind on the body surface with respect to an unknown vector variable. The proposed technique makes it possible to improve the accuracy significantly in...

A new approach is developed for incompressible 3D flow simulation around bodies by Lagrangian vortex method. Closed vortex loops are considered as vortex elements, which are generated on all the body surface and provide the satisfaction of the boundary condition on the body surface. The procedure of the double layer potential density reconstruction...

The paper is concerned with methodological problems of search of new ways of reformation for space engineering education. The problems of renewal of the content of course units and educational forms are of special relevance in the field of education of specialists in design of small and ultra small spacecrafts. Renewal of educational forms is frequ...

This article considers operational dynamics of a solar thermal propulsion unit (STPU) with a solar energy concentrator for CubeSat nanosatellites. It was shown that for a 6U CubeSat with a 1U propulsion system, a resulting delta V of more than 35 m/s in less than 24 h is possible. This delta V is enough to move apart two satellites to opposite poin...

Vortex methods has shown their effectiveness for several kinds of incompressible fluid dynamics problems, were the viscosity effects can be neglected. However simulation of viscous flows via vortex methods meets difficulties because of the viscosity term in the vorticity evolution equation that needs to be resolved. In this paper we give a general...

An automatic spacecraft (SC) is probably the only type of an involved engineering device that is currently devoid of a full system for technical maintenance and repair. When changing to operation with groups of several spacecrafts, the degree of man-made pollution of the near-Earth space increases and there is a need in special SC aimed at removal...

This paper focuses on the modification of the vortex element method for viscous incompressible flow simulations. Viscosity is accounted for using the Particle Strength Exchange (PSE) method by means of approximation of the viscous term in the vorticity evolution equation with an integral operator. Resolution equations for the parameters of the vort...

The article considers the possibility of using a radial dynamic damper for suppressing torsional vibrations of large-scale antenna systems of space vehicles. It is convenient to use such a damper because resulting from internal parametric resonance, energy is transferred from an elastically fixed antenna, whose oscillations are difficult to damp, t...

The new modification of vortex method is considered. It is based on closed vortex loops that can be considered as the separate vortex “superelement”. It is shown that such approach has number of advantages for vortex wakes evolution simulation. The loops generation algorithm permits to simulate the separation zone due to the self-organization of th...

This paper proposes a novel landing gear for spacecraft that allows a weight reduction due to using deformable crash legs. Numerical simulation of the landing process was performed.

The paper deals with modal analysis of elastic cylindrical tank with a clamped bottom partially filled with fluid using the finite element method in open source software Code_Aster. Natural frequencies and modes obtained in Code_Aster are compared to experimental and theoretical data. The aim of this paper is to prove that Code_Aster has all necess...

The results of methodical investigation, aimed on testing of the performances of free opensource CFD toolbox OpenFOAM in the field of simulation of hydraulic units’ dynamics using Finite Volume Method and dynamic meshes are presented. The following key features are reviewed: the choice of appropriate algorithms managing dynamic sliding meshes; desi...

Testing of capabilities of open-source BEM++ code for simulation of acoustics problems at medium and high frequencies is presented. The BEM++ library is a universal tool, which allows to build discrete models for boundary integral operators (single-, double- and adjoint double-layer potential operators and hypersingular boundary operators) and solv...

Due to the development of Wind Energy and construction of new wind farms in Russian Federation there is a need for the solution of application-oriented problems and development of effective methods for calculation of wind turbine’s elements. One of the directions for computational continuous mechanics is connected with problems in aeroelasticity (f...

It is known that most of today's space vehicles comprise large antennas, which are bracket-attached to the vehicle body. Dimensions of reflector antennas may be of 30 ... 50 m. The weight of such constructions can reach approximately 200 kg.Since the antenna dimensions are significantly larger than the size of the vehicle body and the points to att...

Conditions of dynamic instability at parametric resonance in an oscillatory system with three degrees of freedom, which models the motion of an elastically fixed high-drag airfoil under unsteady aerohydrodynamic loads due to the vortex trail separation, are obtained in the linear approximation.

The paper examines the results of using the 3d-printing educational methodology for training the students in the spacecraft-configuration developing area.The first purpose of the considered methodology practice is to implement the rapid-prototyping skills into the educational process, to provide perfection of the student knowledge in configuring th...

The problem of safe air launch vehicle descent from heavy airlifter cargo bay is considered. The influence of aircraft fuselage vortex wake on the descend dynamics is studied. The three-dimensional incompressible flow is considered. The coupled fluid-structure interaction problem is solved. Vortex element method with new vortex element – vortex fra...

The present work is an extention study of aeroelastic vibrations of thin-walled structures with a spatial subsonic flow. An original algorithm for solving complex conjugated aeroelasticity problem, allowing to carry out direct numerical simulation of structural oscillations in the spatial flow of an incompressible medium are developed and tested. O...

The comparison of the experimental and numerical results is presented for the free oscillation pendulum problem in a water tank. The results to be compared include pendulum dynamics information, in particular the evolution of the amplitude of oscillation, and velocity and vorticity fields that can be provided with the help of Particle Image Velocim...

Pure lagrangian vortex methods are suitable for engineering analysis when it is necessary to compute unsteady aerodynamic loads in complicated aeroelastic problems. Lagrangian vortex element methods allow to simulate dynamics of 3D vortex structures with small numerical diffusion because in these methods vorticity is a primitive variable and we use...

The model problem is considered. Dynamics of closed airfoil with elastic contour in 2D incompressible flow is investigated. Finite element method with rectilinear beam elements (6 DOF) with constant cross-section is used. Modal expansion method for numerical solution of dynamics equations and Lagrange vortex element method with Lighthill-Chorin hyp...

Problems of numerical flow simulation around bluff bodies using meshfree Lagrangian vortex element method are discussed. New type of vortex elements – symmetrical vortex fragmenton – is developed and its properties are investigated. Some results of computations with vortex fragmentons are shown.

The process of profile unloading from elastic linkages in a plane-parallel flow of an incompressible medium is examined. The beam model of profile deformation is used. The parameters of the transient mode under different pause durations between linkage breaks are determined. The procedure permitting the solution of the connected problem of aeroelas...

The modification of the meshless vortex method to solve associated spatial problems of hydroelasticity is described. Symmetrical vorton segments and vorton frames on the surface of a body are used. The obtained algorithm is applied to analyze vibrations of a beam in a subsonic flow. Results of the calculation of a model problem are given.

A homogeneous free viscoelastic rod with constant cross-section is under the action of the follower force which has constant value is considered. It is well-known that for elastic rod the critical value of the follower force is approximately equal to p=109,7 (dimension free value). The main result consists of stability loss at presence of non-linea...