CONTENTS #4 (April) 2022
The final-element thermal model of infra-red course IET-29 and its verification by thermal vacuum tests results (p. 3 – 21)
V.A. Ulyanov, N.P. Sizyakov, A.D. Polyakhov
Results of experimental researches of power characteristics of group of emitters IET-29 from composition of the simulator of caloric radiation thermal vacuum chambers VK600/300 FKP «NIC RKP» are shown. With use of the gained experimental data the final-element thermal model of a single source of infra-red radiation IET-29 is developed and verified. Results of computational researches of a thermal regime of an emitter for various values of electrical power made to it are resulted. Gained experimental and design data allow to solve methodical questions of imitation of external thermal load as at a program and technique development cycle thermal vacuum tests of products of space engineering, and at the analysis of their results. Recommendations about control of operational modes and about maintenance of emitters IET-29 are presented.
Keywords: infra-red radiation simulator; emitter; radiating element; power characteristics; thermal mathematical model; thermal vacuum tests; program and technique of tests; thermal regime; thermal vacuum chamber; geometrical model; electrical power; blackness extent.
Influence of Large Downward Wind Gusts at the Supersonic Flight Altitude on the Loudness of a Sonic Boom Near the Ground (p. 22 – 27)
The article presents an extension of the author's analytical methodology (for calculating the additional loudness of a sonic boom near the ground caused by vertical wind gusts at the supersonic flight altitude for large downward wind. The special features of the expression for lifting force and vertical overload equal to or less than zero were eliminated.
Keywords: sonic boom loudness; magnitude of a sonic boom; atmospheric inhomogeneity; vertical wind gust; frontal wind gust; side wind gust; density inhomogeneity; temperature inhomogeneity; vertical overload; flight experiment; wind load reduction system.
Development of Procedures for Monitoring and Analyzing the Execution of Engineering Holding Projects Using the Example of the United Engine Corporation (p. 28 – 32)
O.I. Dontsova, P.V. Trifonov
The article proposes a largely new system for assessing the quality of the implementation of the enterprise strategy for the machine-building holding, which consists in an approach to the integrated assessment of the effectiveness of the strategy that was not previously used in the company's conditions. This approach involves the formation of a hierarchical system for monitoring and evaluating the strategic process of the machine-building holding. The core of the proposed monitoring and analysis model is the project portfolio management system of the machine-building holding. The model under consideration is planned to be implemented in the context of the management system implemented at the corporation's enterprises, focused on creating the shareholder value of United Engine Corporation.
Keywords: enterprise strategy; project portfolio; operational activity; efficiency criterion; key performance indicators; monitoring model.
Protection of aircraft of foreign civil aviation from laser attacks: the current state (p. 33 – 45)
On the basis of the system analysis the problems of flight safety of civil aircraft abroad, arising in connection with the threat of use against them of laser technology for non-military purposes, which has become widespread in society, as well as technological and regulatory ways to solve these problems are considered.
Keywords: laser threat; beam; irradiation; distraction; destruction; glare; flashblindness; eye injure; position system; searchlight; glare shield; airport reference point.
Stability of the Composite Shell Under the Action of Bending Moment, Edge Transverse Force and Internal Pressure (p. 46 – 54)
Currently, polymer composite materials are widely used in the modern aircraft structures. This significantly lightens the weight of the structure while maintaining its strength and stiffness characteristics. Despite the fact that there is a fairly large number of works on such structures strength analysis, the issues of their strength and stability under conditions of a nonlinear initial stress-strain state remain unresolved. The latter is especially necessary for aircraft fuselage structures, in which the composite skin stability loss is unacceptable. The stability of a circular cylindrical shell made of a polymer composite material is investigated under combined loading by a bending moment and a shear force with internal pressure. The influence of the monolayers laying methods, the nonlinearity of deformation on the critical loads of the shell stability loss is clarified.
Keywords: cylindrical shells; polymer composite materials; nonlinear deformation; stability; finite element method.
Investigation of the Dependence of the Power Consumption of the UAV Power Plant on the Payload Indicator when Flying at a Given Altitude (p. 55 – 58)
F.G. Agayev, H.H. Asadov, A.B. Aslanova
The article is devoted to the study of the dependence of the power consumption of the UAV power plant on the payload indicator when flying at a given altitude. The question of a possible change in the total energy consumed by the power unit and the control system of the UAV with changes in the payload in the horizontal flight mode of the UAV is considered. Based on known experimental studies it is shown that in the specified flight mode a change in the payload can lead to the appearance of a specific minimum of the total energy consumed by the power plant and control system. An explanation of the possible appearance of this effect is given.
Keywords: unmanned aerial vehicle; power consumption; power plant; trajectory; payload.