Abstract
This article presents the sensitivity analysis of the method for determination of mass, damping and stiffness coefficients using the impulse excitation technique for a rotor-bearing system. Such an experimental approach is an adequate tool for the estimation of 24 dynamic coefficients, that is 4 damping coefficients, 4 mass coefficients and 4 stiffness coefficients for each bearing. As yet, the literature is exclusive of any researches into the sensitivity of this experimental method itself. However, the influence of several parameters (e.g. supply pressure, bearing geometry, etc.) on the calculation results concerning bearing dynamic coefficients had already been examined in detail. The preparation of the numerical model of the rotor made it possible to assess how influential are the input parameters—such as position and angle of an excitation force or movements of the sensor heads used to measure the displacements of bearing journals—to the results. The potential impact of changing parameters, such as stiffness of rotor material, its unbalance or its geometry, on the values of calculated stiffness, damping and mass coefficients in tested rotor-bearing system was also verified. The paper presents the calculation results of dynamic coefficients for the bearings along with their relative errors. It was shown how the calculated values change according to the different input parameters. The excitation signals and the corresponding system responses were also provided. Moreover, the article contains information on how to enhance the accuracy of calculations.
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Acknowledgments
The paper is financed by Polish National Science Centre as a research project number 2015/17/N/ST8/01825. I would like to thank the employees of the Department of Turbine Dynamics and Diagnostics for their valuable comments and suggestions. I would like also to thank Mr Bart Peeters for the valuable support and the possibility of using Samcef Rotors program.
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Breńkacz, Ł., Żywica, G. (2016). The Sensitivity Analysis of the Method for Identification of Bearing Dynamic Coefficients. In: Awrejcewicz, J. (eds) Dynamical Systems: Modelling. DSTA 2015. Springer Proceedings in Mathematics & Statistics, vol 181. Springer, Cham. https://doi.org/10.1007/978-3-319-42402-6_8
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DOI: https://doi.org/10.1007/978-3-319-42402-6_8
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