CONCEPTUAL FOUNDATIONS OF DISCRETE-CONTINUOUS STRENGTHENING OF ENGINE AND TURBO-EXPANDER COMPONENTS

Abstract

The article focuses on design and technological measures aimed at ensuring improved technological characteristics of engines and turboexpander units. In particular, an improved concept of the technology of discrete-continuous strengthening of structural elements has been developed. This concept combines design and technological measures in a single technical solution. This expanded parameter space ensures greater efficiency of the final synthesised solution. For example, by analysing the stress-strain state of a representative fragment of contacting structural parts, the regularities of the influence of design and technological parameters on strength characteristics are determined: sets of parameters that provide increased strength of contacting parts and their durability are substantiated. Friction in the mating of parts is also reduced. In addition, the efficiency of the mechanism, which includes the contacting parts subjected to hardening, increases. The result is an increase in the technological characteristics of engines, turbo-expander units and other machines whose parts are subjected to discrete-continuous hardening. In general, the developed concept is aimed at a major enhancement of the service characteristics of structural elements. This is stated in the objective functions. These objective functions are minimized or maximized in the extended parametric space. A parametric model of the stress-strain state of a fragment of discrete-continuous reinforced bodies is created. This model makes it possible to study the impact of project and technological parameters and tribomechanical properties of contacting bodies. By purposefully varying the properties of materials, the shape and size of the zones of discrete and continuous strengthening, it is possible to achieve increased tribomechanical characteristics of a pair of contacting bodies.