Vol 11, No 1 (2012)

The problem of forming command control for a hypersonic cruising aircraft during climb is discussed. The motion is analyzed under atmospheric density disturbance and deviations from aerodynamic characteristics of the aircraft. A two-channel control algorithm is proposed: by the angle of attack and fuel consumption per second. The algorithm efficiency as regards compensating the disturbance influence on meeting the final motion conditions is analysed.

The paper deals with up-to-date methods of controlling the geometry of products using laser measuring systems. The basic principles of measuring and examples of devices implementing them are described. The advantages of laser measuring systems over contract ones are shown. The difficulties arising in the integration of laser measuring systems into the production chain of the plant are analyzed and the ways of overcoming them are planned.

The article addresses the structure of combined correlation and extreme system for processing and analysis of visual information to assist control and targeting of moving carriers and remote sensing devices, and to ensure real-time recognition of certain fragments of the surveyed scene. The authors describe algorithms of functioning in the following modes: identification of given objects, direction of targeting systems onto the identified objects, stabilization of sightline of the identified object while the carrier keeps moving relative to the surveyed scene. The article also dwells on a method to improve the reliability of guidance in conditions of current information changing in the process of direction. The results of the research in the efficiency of recognition of binary correlation algorithms under such interference as brightness, changes of contrast, picture smearing for different signal-to-noise ratios are presented. The results of experimental tests of the system prototype on a specialized bench are also given.

The equations of helical surfaces of the main worm of milling cutters designed for gear cutting are defined. They are expressed with parameter vector functions. A computer program is developed for the calculation and construction of the model of the milling cutter main worm.

The paper presents data on the development and research of the process of cramped bending of straight and curved sides of sheet workpieces by an elastic medium. A description of design protected by patents and an invention certificate of the Russian Federation is given. The elastomer working pressure is determined for the implementation of curved side cramped bending by polyurethane in a closed-volume container.

In this article we propose the yield criteria for the calculation of forming high-textured anisotropic blanks, which was developed on the basis of Mises plasticity criterion with regard to the orientation factors and lattice constants.

A method of producing profiles by polyurethane stamping under constrained bending has been developed. Research of the stressed strain state of the elastic punch and the blank has been carried out on the basis of a finite-element model. The influence of the main process parameters on the characteristics of the obtained parts has also been analysed using the ANSYS software. Experimental studies have been conducted which confirm the adequacy of the model devised.

The paper describes methods and results of calculations of sliding in high-speed intershaft roller bearings. It presents the comparison of the results of experimental research in skidding of roller bearings on a test bench, imitating operating conditions of rolling bearings in supports of aircraft gas turbine engines, with calculations based on the computer model of an intershaft roller bearing.

A hot-wire anemometric mass airflow rate transducer is developed. A method of assessing dynamic measurement error on the basis of constructing mathematical models of the transducer’s unsteady heat exchange is proposed.

A new way forming of thin-walled conical parts in a die with an elastic element is proposed. In this method, the conditions of formation are considerably facilitated due to eliminating the reactive tangential stresses on the surface of the contact of the part and the elastic element. That will make it possible: to increase the height of stamped parts, to prevent losses of stability of the stamped part, to increase the maximum coefficient of forming.

The paper deals with the influence of magnitude and direction of ultrasound vibrations in the process of thread cutting on the magnitude and sign of residual stresses and their distribution in the surface layer of pieces made of titanium alloys. The results obtained confirm real prospects of improving the characteristics of fatigue resistance of thread pieces by changing various technological parameters of ultrasonic treatment.

The possibility of forming a compact focal spot with the help of a conical microaxicon in case of linear polarization of a lighting beam by introducing vertical phase dependence into the beam is shown on the basis of the difference method of solving Maxwell’s equations.

The paper deals with the task of determining maximum amplitude of harmonic oscillations with a small external many-valued perturbation. An averaged differential inclusion is constructed in order to solve it using the method of support functions. It mutually approximates the initial system on slow variables over the time interval [0,1/ m], where m is perturbation. The problem of calculating the maximum average for the periodic function arises which is solved by an approximate method.

The paper is devoted to the problem of verification of critical real-time control programs, for example, verification of spacecraft onboard software. A special software complex supporting visual verification of correct synchronization between the controlled processes is described in the paper. A semantic model of real-time control algorithm is also provided.

The analysis of methods of assessing the conformity of hazardous production facilities supervised by Rostechnadzor is carried out. Measures to improve the quality of conformity assessment, the role of which is of great importance in reducing the influence of negative factors in the field of industrial safety are developed.

The paper deals with the application of fuzzy logic method for estimating the competence of personnel. It presents the results of approbation of this method at a commercial enterprise in Izhevsk.