Uniform Electrospark Surface Hardening of Airplane-Engine Parts

Russian Engineering Research - The uniformity of hardening by means of a disk electrode is considered. A helical (reciprocating) tool trajectory is optimal if the inclination of the helix to the...     

Tools for Friction Stir Welding in the Aviation Industry: Morphological Analysis

Russian Engineering Research - A method is proposed for creating the design outline of a tool used in friction stir welding, on the basis morphological analysis. On the basis of the electronic...     

Local Plastic Deformation in Shaping Thin-Walled Aircraft-Engine Components

Russian Engineering Research - The influence of local surface plastic deformation on the local shape change of thin-walled elastic elements is studied.     

Digital Twins of CNC Machine Tools in the Reconfiguring of Aircraft Factories

Russian Engineering Research - A method is proposed for formulating configurational models of CNC machine tools by means of CAD/CAE systems, for use in static, modal, and dynamic analysis at the...     

Design of High-Stress Slip Bearings with Liquid Lubricant

The design of slip bearings with liquid lubricant used in airplane engines is analyzed. The advantages and disadvantages of the bearings when used in highly stressed transmissions are considered. Means of improving the bearings by means of new materials are proposed.     

Local Surface Deformation of Precision Airplane-Engine Components

Local surface plastic deformation may potentially be used for precision shaping of components characterized by low and nonuniform rigidity in the control systems of airplane engines. Analysis of options for the control of technological shape inheritance gives rise to methods of effective deformation. By simulating the stress–strain state of the surface layer, a method is proposed for specifying the local deformation conditions so as ensure shape precision of the part’s working surfaces.     

Diffusion controlled analytical performances of hydrogen peroxide sensors: Towards the sensor with the largest dynamic range

Analytical performances of chronoamperometric sensors are limited by mass transport of analyte, specifically by its diffusion within Nernst's layer. Limiting performance characteristics of hydrogen peroxide sensors are achieved using the most advantageous electrocatalyst for its reduction - Prussian Blue. We report on improvement of sensitivity and detection limits of H₂O₂ sensors by substituting conventional electrode with ultramicroelectrode and with nano-electrode array. Prussian Blue based microelectrodes displayed improved sensitivity in hydrogen peroxide detection, which is close to be inversely proportional to electrode radius. To form nano-electrode arrays we used nano-structuring of the electrocatalyst on inert electrode support. Hydrogen peroxide sensor made by deposition of Prussian Blue through sol template based on vinyltriethoxysilane (nano-structuring was confirmed by AFM) displayed linear calibration range prolonged over seven orders of magnitude of H₂O₂ concentration, which is record in electroanalysis. The two to three orders of magnitude prolonged linear calibration range without loss of sensitivity seems to be at the limiting level for sensor improvement by forming micro- or nano-electrode arrays.