Vol 59, No 2 (2016)

This paper considers the issue of direct and indirect effects of lightning strikes on aircraft. It is proposed to study electromagnetic fields and interferences that affect aircraft instruments based on the theory of large-scale experiment.

The paper provides a method for multi-criteria selection of the optimal structural layout option based on a fuzzy logic inference that allows for uncertainties in engineering and operates with heterogeneous information of the qualitative and quantitative nature for the systems being designed.

This paper presents the controller synthesis for an unmanned helicopter with minimum initial information about the parameters of its mathematical model with time-delays of measured and control signals. The unknown parameters, wind disturbances, and system nonlinearity are considered as external disturbances that are estimated using a multi-gap observer. The estimates obtained are used in the control law to improve the stability rate for flight regimes.

Dynamics of a gas bubble in a liquid near a solid wall is studied. The influence of the initial spheroidal disturbances of the bubble shape and the distance to the wall on the dynamics of the bubble–liquid system is analyzed. The pressure in the bubble is initially greater than that of the surrounding liquid. An algorithm based on the Euler scheme and the boundary element method is applied in the calculations.

The aim of the investigation is to develop a technique of recalculating the lift as a function of the angle of attack at different reference points of the aircraft model height over the ground surface. A technique for evaluating the lift of the aircraft model close to the ground surface is proposed.

This study presents the detailed description of an experimental test rig for local heat transfer measurements as well as the calibration technique and the postprocessing and test run data for a ribbed channel with 45 deg inclined ribs.

The paper deals with the technology of fabricating the filters used in aircraft engines. The new methods of electrochemical dimensional processing are presented, which are used for collective processing of openings with various cross-sections in thin-walled filters.

The analysis and processing results for the known GTE compressor characteristics data are presented. An original method of the universal dimensionless representation of these characteristics is proposed. The dependences obtained are shown in the graphical and analytical form and they are compared with the experimental results.

An indirect method of estimating the visible flame propagation speed of the methane–hydrogen–air mixture with account of carbon content in the fuel mixture and the ion current amplitude is proposed by the experimental results. By comparing the calculated and experimental values, it has been shown that an approach using the methane–hydrogen mixture is advisable at the stage of the internal combustion engine design and development.

As a result of investigation, the reasons of forming the defects of skin aerodynamic surface shape at roll-bending were determined and technological recommendations on their prevention were provided.

An innovative kinematic scheme of pneumatic turbine drive was proposed and the use of two-row centrifugal-centripetal turbine stage was justified. We proved the feasibility of the proposed kinematic scheme of the turbine drive in a variety of aircraft components by an example of the manual pneumatic grinding machine.

We propose the solution of a logical task in CNC system using software-implemented programmable logical controller (Soft PLC). The solution proposed allows unifying the control algorithms of auxiliary equipment of machine tools and reducing the product launch time of new equipment.

The paper presents a technique of the neural network model reduction for the GTE operation mode monitoring during bench tests. The technique is based on the conversion of the neural network training task to the of multi-criteria optimization task.

This paper presents the method of preparing the water area of a seaplane basin. It is proposed to use the network structure of the bottom transmitter-receiver antenna assemblies, generating ultrasound in an aqueous medium due to the nonlinear acoustic effects, for echolocation with the adjustable angular resolution of submerged objects.

This paper presents the results of analyzing the shaping of thin-walled conical parts with the uniform thickness along generatrix.