On the experimental prediction of the stability threshold speed caused by rotating damping
| Autor: | P. De Baets, Mia Loccufier, Bram Vervisch, Stijn Derammelaere, Kurt Stockman |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Rotating unbalance Acoustics and Ultrasonics Rotor (electric) business.industry Mechanical Engineering 02 engineering and technology Mechanics Rotordynamics Condensed Matter Physics 01 natural sciences Instability law.invention 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials law Control theory 0103 physical sciences Magnetic damping Eddy current Boundary value problem business Damping torque 010301 acoustics |
| Zdroj: | Journal of Sound and Vibration. 375:63-75 |
| ISSN: | 0022-460X |
| DOI: | 10.1016/j.jsv.2016.04.014 |
| Popis: | An ever increasing demand for lighter rotating machinery and higher operating speeds results in a raised probability of instabilities. Rotating damping is one of the reasons, instability occurs. Rotating damping, or rotor internal damping, is the damping related to all rotating parts while non-rotating damping appearing in the non-rotating parts. The present study describes a rotating setup, designed to investigate rotating damping experimentally. An efficient experimental procedure is presented to predict the stability threshold of a rotating machine. The setup consists of a long thin shaft with a disk in the middle and clamped boundary conditions. The goal is to extract the system poles as a function of the rotating speed. The real parts of these poles are used to construct the decay rate plot, which is an indication for the stability. The efficiency of the experimental procedure relies on the model chosen for the rotating shaft. It is shown that the shaft behavior can be approximated by a single degree of freedom model that incorporates a speed dependent damping. As such low measurement effort and only one randomly chosen measurement location are needed to construct the decay rate plot. As an excitation, an automated impact hammer is used and the response is measured by eddy current probes. The proposed method yields a reliable prediction of the stability threshold speed which is validated through measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect