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Evaluation of a simple method of identification of dynamic parameters of a single-degree-of-freedom system

Tabaszewski M., Wojsznis M.

Vibrations in Physical Systems

2017

Vol. 28

art. no. 2017005

The paper presents a simple method of identification of dynamic parameters of single-degree-of-freedom systems based on an impulse test. Numerical simulations consisting in generating a model impulse excitation and the response of a model system with specified dynamic parameters to this excitation have been carried out to present the applicability range of the method. The influence on parameter estimation errors at various set values of these parameters and procedure parameters has been investigated.

Identification of Inertia, Damping, and Stiffness Parameters for Low-Pressure Steam Turbine Frame

Krawczuk M., Murawski L., Ostachowicz W.

Machine Dynamics Problems

2003

Vol. 27, No. 1

41-54

The paper deals with modern methods of investigating the low-pressure frame of a steam turbine. The objective of this paper is to estimate typical parameters of the low-pressure frame of a steam turbine. The numerical calculations are presented for the frame of 200 MW low-pressure turbine. In particular, methods of calculating inertia, damping, and stiffness parameters are investigated. These data form a basis for new symptoms of the turbine technical condition. The identification process uses dynamic amplitude-frequency and phase-frequency characteristics. Those parameters are estimated using a finite element method approach, which calculates the dynamic flexibility of the structure. Natural frequencies and modes are determined for the turbine frame. The paper describes a physical and numerical model of the frame as well the results of calculations for the above-mentioned inertia, damping, and stiffness matrix.