Vol 11, No 3-2 (2012): Special Issue

The paper discusses the impact of the shadow area of the orbit space laboratory, designed to implement the gravity-sensitive processes, the logarithmic decrement of natural oscillations of solar panels. For the numerical simulations are used orbit ranging from 200 to 600 km. It is assumed that the panel frame is made of magnesium alloy MA2. The results can be used when designing a special laboratory space technology applications.

An experimental technique is developed to estimate efficiency of ring dampers for gas turbine engine blisk using the scanning laser vibrometry method. Four damper types based on split friction rings with different sizes are studied. It is shown that ring dampers increase damping efficiency up to 20 times.

In this paper the researches of thermomechanical conditions of compressor blades made by high-speed forging process from α+β titanium alloys with heating above a point of polymorphic transformations are discussed.

Today more widely used methods of rapid prototyping. The main difference between rapid prototyping technologies to the conventional approach is to reduce the time for production tooling. The paper describes the experience of prototyping technologies to produce parts of the combustion chamber. To optimize the process of casting and gating the supply system is carried out modeling of forming of the workpiece in the CAE system of casting processes ProCast. The experience of making wax models using silicone molds, production of ceramic molds and pouring the metal.

The article deals with the case of air into the fuel system piping. Different amount of air in the fuel system was simulated. The Euler method is used for modeling three component liquid (kerosene, kerosene and air, air). Calculation was focused on tracking the dynamics of the axial force acting on the rotor auger centrifugal stage. The calculation showed that the increasing of volume of gas lead to increases the amplitude fluctuations of axial force.

The article describes the acoustic characteristics of material «metal-rubber» (MR). A mathematical model for determining the flow resistivity was developed. Selected coefficients in a mathematical model to calculate the acoustic characteristics of the MR. The calculated values of resistivity blowing and the sound absorption coefficient of the parameters of the sample.

This report focuses on product realization process and milestones in manufacturing planning. Enterprise Resource Planning (1C) and Manufacturing Execution System (Sprut) have been analyzed. Base on the examples from production and service provision authors summarized the threads and opportunities while measuring the effectiveness of implementation process.

Us by the Bubnov - Galerkin method to solve the problem of cyclic compression laminated single-impurity flying corrugated package with respect to rotation of end sections of laminated corrugated. The decision received relations describing any process of loading in the elastic - hysteresis loops of the package. The good agreement between experimental and theoretical results.

In this article are described. features of final-element modeling of thin lubricating layers by means of modern software, such as by ANSYS APDL, ANSYS CFX and ICEM CFD. The essence of the main problems arising at narrow gaps models splitting on final elements is opened. Advantages and disadvantages of program modules at work with small gaps are given. Solutions of the difficulties arising at final-element modeling are shown, in particular, problem of final element zero thickness and problem of calculations bad convergence in various ANSYS modules. Conclusions about methods of mesh quality improvement are drawn. The directions of further researches are described.

Sequence of operations in the offered interactive mode of quantitative interpretation of the spekl-interferograms received at static or dynamic loading of elements of a design is considered.

This paper presents a measuring system allows us to investigate transient dynamic response control devices. Registration parameters: flow, pressure and spool valve displacement, conducted in real time using the software package PowerGraph and board DAC-ADC mod. E-20-10. The results allow to deduce the laws from the exit flow parameters and refine the mathematical description of the hydraulic control unit.

The analysis of proximate solutions of the Mathieu equation, taking into account the energy dissipation in the contact zone "tire-rubber grips treadmill track." Substantiated the minimum value of the modulation depth of elasticity, provides an exception parametric resonances at speeds 15 or more m/s. An embodiment of the track, providing a limited variation of the parameter of the modulation depth of elasticity.

In the paper, software for digital control of gas pressure in a vessel is developed to increase process quality and accuracy. Operating principal is based on stepped variation of a throttle area at the vessel output (or/and input) using pulse code modulation. The control device is made as set of parallel on-off valves. Flow areas of the valves can be presented by binary dependencies of the smallest cross-section or by the Fibonacci series. The number of valves depends on control process accuracy. Simulation results show a good correlation with experimentally obtained data proving efficiency of the proposed control strategy to providing high accuracy and proper quality of transients.

The work deals with the equivalent vibration testing, selection of optimal structural and technological parameters of vibration dampers made of MR material.

The basic problem of gas turbine engines compressor optimization are described.

The article is devoted to the development of a three-axis kinematic model of a pneumatic manipulator and the testing of it on a physical model. Optical rangefinders are used as position encoders. The results of physical and mathematical modeling are compared. The reachable area of the manipulator is shown. The control laws of pneumatic actuators have been built on the basis of fuzzy logic.

The calculation research of the working process of multistage axial turbine in two different software systems was performed. The calculations were performed using an identical geometry, boundary conditions and under the same engine operation conditions. Detailed information about the parameters and structure of the flow in the turbine.

Is discussed one of the problems for fine-tuning and redesigning blade machines - reverse designing task (reverse-engineering task). Two methods of compressor blades profiling are described. It’s traditional coursed method and theoretical, both based on using symmetrical profile and middle curve. Author suggested reverse-engineering algorithms for both methods. For method which use more accurate theoretical method as base method suggested algorithm is described in details. Successful tests of program using this algorithm are showed. It was performed with compressor profiles and also turbine profiles which is known as more curved.

The results of strength and gas dynamic improvement of turbocharger TK-32 axial turbine are presented. Turbocharger is used as unit boost for diesel locomotive. The aim of this work was to ensure turbine work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the region of high stresses on rotor blade body. These stresses exceed allowable values when rotor speed was increased.

The variant of peripheral rotor blade section displacement, allowing to reduce the level of stresses by 20%, was found. Gas dynamic calculation showed that variant of rotor blade modernization results in an increase of efficiency by 0.4%.

The analysis of the most existing small sizes gas turbines plants with power from 1 to 500 kW is made. And the attempt to integrate obtained data and to find the advanced concept of such plant are done.

The results of development and experimental studies of acoustic probes with corrective elements in the form of a long line and a serial connection of rubber tube and a metal tube. As a result of the tests obtained the frequency characteristics of acoustic probes in the frequency range of 800 Hz at an air pressure of up to 8.0 kg/cm2. Ana's recommendations for the use of the investigated acoustic probes for measuring pressure fluctuations in the flow path of gas generator.

The article discussed in detail the principles of the process of constructing energy efficient industrial enterprise in the new conditions market of electric power in Russia.

Investigated the problem of structural design process of defining the necessary elements of the assembly and operators changer in their optimal relationship, which can be reduced to six typical tasks of determining the structure of the process or options materials. Research ordered structures derived from the range of product assembly components is presented with the sequence their implementation in relation to a specified element, with the exact coordinates for each transition.

The results of design and tests experimental facility of close gas organic fuel-powered 1…3 kilowatt turbine, main characteristics and prospects of development were presented.

In this article is considered NPO Saturn experience on gas-turbine unit development with aim of rotors wedging correction.

Computer-aided system of gas turbine engine calculation and analysis (ASTRA) developed at the Aircraft Engine Theory department of Samara State Aerospace University is described. Its functional capabilities and development of gas turbine engine simulators for various initial-stage design tasks are described.

Various aspects of engineering education level system is considered.

The problem of professional socialization of students of aerospace specialties is analyzed and its definition take into аccount influence of the environment on the student and feedback is given. Principles of professional socialization of students of aerospace engineering specialties are formulated and ways of their realization in the conditions of space higher education institution are offered.