Analysis of the Frequency Interaction of the Turbine Block in the Stand for the Magnitude of the Error in Measuring the Turbine’s Power

Abstract

An algorithm for constructing a dynamic analysis during the formation of a wave field of stand for testing turbines and the effect of the frequency interaction of the stand’s elements on the measurement of its magnitude is described. The research algorithm involves the use of theoretical solutions of nonlinear wave processes using linear oscillations, refined by experiments. The diagnostic model can determine the technical condition of the stand’s elements and also determine the causes of the discrepancies between the calculated and measured turbine power values. To clarify the stiffness coefficients between the stand’s elements, a modal analysis was used to obtain the range of their changes depending on the external dynamic load, which made it possible to assess the impact of changes in the frequency interaction conditions on the turbine power measurement at different test modes. The conditions for amplifying the amplitude of oscillations at their eigenfrequencies are obtained, and the value of the possible deviation of the expected power value at its measurement for specific modes of the turbine is calculated. The algorithm allows to estimate the dynamic state of the stand-in different research modes of turbines and give recommendations for reducing the level of frequency interaction.

Principles of Imitation for the Loading of the Test Bench for Gas Turbines of Gas Pumping Units, Adequate to Real Conditions

“…Articles [1,20,21] mention the importance of estimating eigenfrequencies when the bench is operating. The proposed solutions have general applicability and can be extended to many other different cases.…”

“…This requires a significant investment of time and effort to prepare for testing-installation, alignment, preparation of test programs, calibration of sensors, etc. [1]. Hence, the issues of justifying the choice of the principle and the technical means of loading the gas turbine, as well as the control system of the storage device and measuring the parameters of the gas turbine during load tests, become very relevant.…”

Advances in Machine Fault Diagnosis

“…The authors of [2] analyzed the frequency interaction of the turbine block in a stand with respect to the magnitude of the error in measuring the turbine's power. They proposed an algorithm for constructing a dynamic analysis during the formation of a wave field of a stand for testing turbines.…”