Optoelectronic discrete-phase converter for automated control systems of geometric parameters of the surface of gas turbine engine blades

Gas turbine engine blades are products with a complex spatial configuration that requires high manufacturing precision, which in turn is determined by the complex overall balance between aerodynamic, strength characteristics and production and technological requirements. During the production of blades, the surface profile in various sections of the blade airfoil is subject to control, among others. Deviations in the shape of the theoretical section and the installation angle of the profile lead in practice to a deviation of the natural vibration frequency of the blades from the calculated values. Increasing the accuracy of geometry control in the technological process of manufacturing gas turbine engine blades is in demand and important. A measuring device developed by Samara University is briefly described: an optoelectronic discrete-phase converter (OEDPC), which is designed for non-contact determination of geometric parameters – the profile and curvature of gas turbine engine blades. The implementation of the OEDPC is based on a method for determining the parameters of the surface geometry of a gas turbine engine blade, which consists in measuring the deviations in time of the position of the maximum information signal from the reference one and makes it possible to increase the accuracy of determining the profile and curvature of the blade airfoil while maintaining performance at the level of the best examples of optoelectronic converters of a complex-profile surfaces.