Model-based measurements in the monitoring tasks of high-power plants

Abstract

The tasks of the measuring information obtaining about the state of the blading section and structural elements of gas turbine engines, as typical representatives of high-power plants, in the process of their experimental research and testing are considered. Such measurements are usually characterized by extreme environmental conditions, complex shapes and multidimensional movements of the monitored surfaces, strict constraints on the number and location of primary transducers, etc. As a result, the required measurement information is obtained under the influence of a large number of interfering factors, which are not always available for direct measurements and consideration in the experimental data processing. The approach based on the modeling the immeasurable components counting the current parameters of the power plant mode and environmental conditions is considered as an alternative to the direct measurements. The use of online models allows (in addition to increasing the reliability of measurements) to evaluate the unique characteristics of the monitored object (e.g., changes in shape) and, in some cases, to predict its critical state. The examples of the practical implementation of the approach in specific measurement systems designed for bench testing of gas turbine engines are also given in the article.