Vol 11, No 4 (2012)

The work deals with mathematical models and a simulation algorithm for the estimation of the relative time necessary for directing the axes of celestial coordinators to the sky regions, excluding the possibility of sunlight exposure and Earth shielding.

The paper presents the problems of assessing the relative position of angular accelerometer sensitivity axes and astromeasuring basis of the attitude control system as part of flight calibration of a platformindependent inertial system. The inaccuracy of the angular accelerometer is defined and taken into account. An algorithm of in-flight geometrical and parametric calibration of the meter is suggested.

Two variants of uncontrolled motion of the “ Soyuz “ carrier rocket after spacecraft separation are discussed in the paper: the motion of the upper stage after the completion of the work of the jet nozzle producing additional force that takes the upper stage away from the spacecraft; and the motion of the stage in case the mode of using the jet nozzle is eliminated in the cyclogram of “ Soyuz “ operation. Probability models of the initial conditions of angular motion are constructed. The peculiarities of the orbital stage motion are revealed, i.e. that it is possible to maintain certain angular orientation during the period of time sufficient for successful performing of navigation-communication tasks in the course of short-term research experiments on the “ Soyuz ” carrier rocket orbital stage after payload separation.

The paper deals with the problems of generation and implementation of spacecraft angular motion control programs, the peculiarities of their parametrization for different flight legs in the sensing interval for the RESURS-P spacecraft onboard control system. The conditions of design and parametrization of control programs are systematized.

Possible approaches to the designing of a new generation sensor of the Sun’s position distinguished for its reduced mass-size specifications and an enlarged field of view are discussed in the paper. Brief analysis of the elemental basis necessary for the construction of the device is made. The results of power and precision modeling as well as the designed exterior view of a new generation sensor of the Sun’s position are presented.

A dynamic model of spacecraft solar panel deployment is developed. In describing the motion each body of the system (spacecraft, panels, rods) is considered to be a free one. The action of other bodies on it is accomplished by means of imposed kinematic constraints. A system of equations to determine the reaction of constraints in an arbitrary node of solar battery panel deployment is derived. The main integral parameters of the deployment process are identified: the dependence of the system’s energy, deployment angles and angular velocities of panels and rods on time, the sequence of fixing the panels and rods, the time of the deployment process.

The paper presents a method that makes it possible to assess the changes in the sound-proof ability of the panels of the head part of a rocket, considering all the heterogeneities of its structure. The results of calculating the influence of removing part of the sound-proof material from the surface of a standard head part of a rocket on the ultrasonic pressure under the head part are presented.

The basic modes of flow about a launch vehicle with large nose fairings are discussed, some actual trajectories taken as an example. The Reynolds and Mach numbers are calculated on the basis of the parameters of the given trajectories, the modes of flow about the launch vehicles are determined. The possibility of using the ANSYS FLUENT software for the simulation of the flow about a launch vehicle on the actual trajectory is dealt with.

Life tests of pipeline elements such as a strongly curved branch pipe by pulsating internal pressure have been carried out. In the course of the tests it was established that the pipes formed by flexible pushing through a die with the internal pressure of the filler and those produced by flexible expansion with elastic medium have cyclic longevity exceeding the resource of an airframe.

The paper presents a procedure of calculating efforts of sheet blank forming which makes it possible to reduce the probability of corrugation in stretch forming and the labor input.

The paper is devoted to the analysis of the stressed state of the process of high-speed extrusion. Factors that influence the stressed state at all stages of shape-forming are analyzed in detail. The influence of inertial forces on the force parameters of extrusion is discussed. The relationships required to determine power conditions of forming are given. Profound analysis of modeling the process of high-speed extrusion of a gas turbine engine compressor blade is carried out. The results of modeling confirm the theoretical conclusions.

The article presents a method which considers the influence of fuel and oxidizer tanks of a launch vehicle on sound propagation in the inter-tank space. An example of finding resonant acoustic modes and frequencies of a launch vehicle module and the analysis of sound-insulation characteristics of the module are also given.

The aim of the paper is to determine the area of possible ultimate states of a plate made of an ideal elastoplastic material in a plane taut state, with the plate having a blind fractured defect (a scratch). This problem is of a more general character and presents a greater practical interest than just a scratch problem since in thinwalled constructions and enclosures whether it be plane fuselage or rocket fuel tanks etc. there always exist damages resulting from external actions and transforming into scratches in the process of operation.

It their turn, scratch dimensions will gradually increase as a result of cyclic loads arising during operation. There naturally arises a problem of determining the ultimate dimensions of these defects which can result in the fatal failure of the whole structure at a given level of operating loads.

An algorithm of clock synchronization and evaluation of noise power based on the use of repetition of parts of a multipath signal is presented in the paper.

The paper presents an analysis of the possibility to detect sharp focused radiation with the help of variously shaped probes. The relations of a beam’s energy characteristics at the input and output of variously shaped scanning probes with different diameters of input windows are worked out. The sensitivity of a tapered dielectric probe to sharp focused radiation with the dominating longitudinal component of the electric field in the central peak of the focal spot is demonstrated.

The problem of flight timetable optimization is solved on the basis of the fuzzy set approach taking account of the parameters of ground service technological schedules for an airport operating within the framework of the transfer system of air transportations. Methods of expert evaluation and statistical processing of the airport information system statistics are used in forming fuzzy input data. An example of a problem solution is given.

The paper deals with the problem of risk management in developing quality management system processes. A model of FMEA-analysis based on the calculation of the priority number of risks for inconsistencies, their causes and consequences taking into account changes in the "incidence" and “capability of detection” with the simultaneous occurrence of several adverse events.

The paper deals with the problem of measurability of knowledge and building competences in vocational education in the study of humanities. It is shown that personalized education based on the measurability of the process of mastering of the training material and the adequate support of the instructional process is to play a significant part in modern education.