Vol 62, No 4 (2019)

The design and operating principle of a wheel motor for landing gear are presented. The purpose of the work is to add the braking function and increase the energy performance.

The paper presents the results of calculating the strength properties for the fan blades of a regional aircraft gas turbine engine under consideration of manufacturing deviations. The models of blades with different geometric deviations on the airfoil being analyzed, the design model of the fan assembly, the strength properties being estimated, and the design scheme for a set of blades are described. An example of the calculation results is given.

The paper considers the solution of the problem of determining the topology of the heated load-bearing structure and the size of the load-carrying elements that provide minimum compliance within a given mass using the criteria method of evolutionary optimization. The test cases are solved.

The measurement data of three magnetometer sensors were analyzed in order to assess the significance of effect of the mission and supporting equipment operation on the adequacy of measurements of the Earth’s magnetic field by airborne means of the technological Foton-M no. 2 spacecraft. The research results demonstrate the significance of the problem of such effect and allow us to develop measures to eliminate it. It is especially relevant for designing new small spacecraft.

A technique of multiobjective robust controller synthesis for an electro-optical device line-of-sight stabilization system with saturating actuators is developed on the basis of polytopic linear parameter-varying system theory. From the computational point of view, the synthesis procedure is reduced to convex optimization under constraints expressed in the form of linear matrix inequalities. The multiobjective synthesis of the robust control law for the stabilization system being considered is performed.

Based on the experimental studies of models in a vertical wind tunnel, an aerodynamic solution was found in the form of an extension in front of the horizontal tail of certain geometry, allowing considerable improvement of spin characteristics and ensuring the spin recovery by various methods that is especially important for a trainer aircraft. The paper presents the results of experiments on dynamically similar free-flying models confirming the improvement of spin characteristics and experiments on weight models proving the positive effects obtained.

The paper presents the calculation results for ejectors with a curvilinear section of the mixing chamber. The choice of a turbulence model is reasoned. The effect of the relative radius of the bleed-off curvature on the pressure loss is analyzed and the application of the methodology developed for calculating ejectors with a curvilinear section of the mixing chamber is justified.

An effective unconditionally stable numerical method for solving equations describing the flow of supersonic turbulent jets is developed. The method does not require the inversion of block tridiagonal systems of algebraic equations. The results obtained according to this method are in fairly close agreement with the calculations results on the basis of other methods and experimental data.

Achieving the accuracy and reliability of the entire range of requirements for samples of aerospace equipment involves the use of system coordination of tasks across the spectrum of indicators and parameters with risk analysis. The theoretical and applied basis for the implementation of system coordination is the approach based on innovative information system methodology of risk management.

A method for express analysis of mechanical, erosion and contaminating impact of plasma jet of an electric propulsion thruster onto the large object of space debris during its de-orbiting from a protected orbit to the disposal one is presented. The results of analytical and numerical calculations agree that verifies the method validity.

A statistical analysis of the baseline strength characteristics of the EI698-VD alloy disks of high-pressure turbines of the NK family engines operating as a part of gas compressor units is performed. The results of the assessment of mechanical properties stability in the disk production during the period 1998–2015 are presented.

The influence of the corrosive environment on strength characteristics of heat-resistant alloys at high temperatures is discussed. The results of corrosion tests for two heat-resistant nickelbased alloys simulating the processes of alloy sulfide-oxide corrosion during operation are presented. Extrapolated values of specific mass changes for 5000 h at temperatures of 600–750 °C were determined using the mathematical models obtained for tests lasted up to 1000 h.

The paper considers the effect of vibrations on operability of the end mills at machining titanium alloy blanks. Investigations into the effect of vibrations on the durability of end mills and dependences of the durability on the cutting condition parameters are presented. The paper investigates a problem of the mill teeth run-out and methods of its reduction.

We consider the procedure of refinement in a calculation model according to the known experimental data using the sensitivity function. A solution algorithm and regularization are presented.

An invitational method is proposed for modeling transient loading processes of a helicopter during a flight. Formulas are presented, which allow performing imitation of lagging. An example of numerical modeling for a transient flight regime is presented.

Some results related to the development and implementation of the NORMA Labor Standards CAD system are given. The system is designed for improving the efficiency of aircraft production technologies in terms of mechanical processing management. A brief review of computer based standardization methods used by aircraft production companies is carried out. The special aspects of integration of process-oriented automation systems are given. The result of research on the development of integrated standards for pilot production is presented.