Dissertation for the degree of candidate of technical sciences in the specialty 05.11.13 – devices and methods for monitoring and determining the composition of substances. – Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, 2021.
The paper analyzes the methods and means for monitoring the vibration state of the GPU vane apparatus and substantiates the prospects of using the method of direct aerodynamic calculation of profiles relative to the state of the GPU blades, which requires its theoretical justification with access to numerous calculation algorithms, as well as the use of the latest hardware and software for building a control system, which allow integrating it into the GPU control system.
Theoretical substantiation was carried out and mathematical models of the process of changing the geometry of the blade (technical state) and its flow were developed using the Fredholm integral equation of the second kind, and a numerical method for its implementation was developed. A method is proposed for the mathematical parameterization of the geometry of the blade profile using interpolation Hermite polynomials. A method for determining the geometric dimensions of the blade and its initial technical state is presented, and a software product is developed for the implementation of a numerical algorithm and obtained results of modeling changes in the state of the blade apparatus.
The methodological support of experimental studies of the vibration state in the GPU type TS-16-S in the "ring" mode is considered and a system for monitoring the vibration state of the vane apparatus of the GPU is developed on the basis of hardware and software from Siemens. The results of experimental studies are analyzed. The normal law of the distribution of statistical characteristics of the vibration process of the GPA-Ts-16S, the regularity of the change in the angle of rotation of the VNA blades from the rotation frequency, the regularity of the change in the pressure at the output of the high pressure pump from the frequency of its rotation and the angle of rotation of the VNA blades were established, the procedure for determining the vibration levels at characteristic frequencies was considered. substantiated the choice of diagnostic signs of the vibration state of the aircraft GPU.
An extrapolation model for predicting the phenomenon of GPU surge and its implementation on the basis of a modernized system for monitoring the vibration state of the GPU vane apparatus is considered. A method for obtaining an expression for the readiness indicator Pg is given and its dependence on the control period is established according to which, at Pg = 0.915, the control period will be 20-30 hours.
It is shown that the industrial testing of the developed method and system for monitoring the vibration state of the GPU vane apparatus at the compressor station of LLC "Operator of the gas transmission system of Ukraine" (Western region) has confirmed their effectiveness.
Key words: control methods, diagnostic feature, technical condition, control system, vibration state, GPU, algorithm, aerodynamic calculation, mathematical model, equations, numerical method, surge, control period, interpolation polynomial, blade apparatus.
