Performance evaluation of touchdown bearing using model-based approach
| Autor: | Toni Hartikainen, Jussi Sopanen, Teemu Sillanpää, Janne Heikkinen, Neda Neisi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Bearing (mechanical) Computer science Applied Mathematics Mechanical Engineering Aerospace Engineering Touchdown Magnetic bearing Ocean Engineering 02 engineering and technology law.invention 020303 mechanical engineering & transports 020901 industrial engineering & automation Critical speed 0203 mechanical engineering Control and Systems Engineering law Control theory Frequency domain Harmonics Electrical and Electronic Engineering Helicopter rotor Position sensor |
| Zdroj: | Nonlinear Dynamics. 101:211-232 |
| ISSN: | 1573-269X 0924-090X |
| Popis: | In the active magnetic bearings (AMBs) supported rotating machinery, touchdown bearings are considered as safety devices to support the rotor in the deficiency of electromagnetic field. Generally, the industrial AMB machines do not have force sensors for touchdown bearings and the system is only equipped with the position sensors to monitor the rotor displacement that disables the opportunity to measure the forces during dropdown events that might be destructive for the safe operation of the rotor system. This study explores the relative severity of dropdowns that are evaluated from a computational rotor model using the rotor displacement data recorded from the position sensors installed in the machine as an input. The model for double-row angular contact ball bearing type touchdown bearings is integrated with the rotor model. The simulation model is verified by comparing the simulated rotor orbits against measured orbits at four different dropdowns. The Fast Fourier transform (FFT) is used to observe the studied dropdown events in frequency domain revealing from the rotor response the following details: harmonics of the operation speed, rub-impact frequencies, pendulum motion of the rotor and the first two bending frequencies of the rotor settled on the touchdown bearings. The critical speed map also verifies the bending frequencies and identified support properties. The model-based approach can be used to evaluate and compare a single dropdown event with respect to previous events providing an insight for decision making whether touchdown bearing should be replaced. |
| Databáze: | OpenAIRE |
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