Volume 37, Nº 12 (2017)

To permit calculation of the fatigue strength of drive components, drives are classified in terms of their loading conditions. Formulas are presented for the equivalence factors used in converting the actual variable loading conditions to conventional constant conditions. The overload coefficients required in calculating the static strength of drive components at the peak load are also determined.

A method is proposed for determining the load in the gear engagements of a multiflux planetary gear with flexible carrier jaws. The influence of the design and manufacturing errors of the mechanism on the pliability of its components and the nonuniformity of the load distribution over the satellites is determined.

A finite-element model is proposed for the shaping of internal pipe-blank surfaces by means of the pressure of a magnetic pulse. The roughness of the internal surface after compression onto a mandrel is expressed as a function of the number of loading cycles, the pressure of the pulsed magnetic field, and the initial roughness of the blank.

The production of complex (multielement) nitride coatings on the basis of different cathode structure and configuration is considered. The coatings obtained by means of one-piece and composite cathodes have different properties. This difference is smaller for multielement coatings.

The influence of hollow aluminosilicate microspheres on the efficiency of elastomeric thermoprotective materials based on ethylene—propylene rubber is considered. The introduction of hollow aluminosilicate microspheres, even in small quantities, decreases the density and heat conductivity of such materials, with no loss of physical and mechanical properties.

Additive manufacturing methods are briefly reviewed. Proposals are outlined for the use of ultrasound in fused deposition modeling (FDM) and selective laser melting (SLM). Approaches to ultrasonic additive manufacturing (UAM) are discussed.

Dimensionless characteristics of turbines are discussed. On that basis, a universal method of mathematical approximation is formulated. The approximation of the turbine characteristics in a TKR-10ST turbocompressor is considered, as an example.

Special high-efficiency cleaning methods are required for industrial products, on account of their complex geometry and the wide range of surface contaminants. The design of ultrasonic radiators for that purpose is considered. Geometric aspects of the formation of cavitation regions are discussed.