Frequency Response Characteristics of Unbalance and External Excitations of Scanner Rotor Supported by Self-Acting Grooved-Journal Air Bearings
| Autor: | Yukio Itami, Taeyeon Hwang, Kyosuke Ono |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Physics
Frequency response Rotating unbalance Bearing (mechanical) business.industry Rotor (electric) Mechanical Engineering Fluid bearing Natural frequency Structural engineering Mechanics Industrial and Manufacturing Engineering law.invention Vibration Transverse plane Mechanics of Materials law business |
| Zdroj: | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C. 62:3915-3921 |
| ISSN: | 1884-8354 0387-5024 |
| DOI: | 10.1299/kikaic.62.3915 |
| Popis: | We theoretically and experimentally investigated the unbalance response characteristics of a miniaturized laser scanner rotor supported by self-acting grooved-journal air bearings. In the analysis the elastic deformations of the fixed center shaft and its fitted point are taken into account. The validity of the analysis was confirmed by experiments in terms of the amplitude and phase of unbalance vibration. The lowest natural frequency decreases from more than 100000rpm to 60000rpm when considering the elastic deflections of the center shaft are considered. Then, we numerically analyzed the frequency response characteristics of a laser scanner rotor caused by external excitation of transverse and angular vibrations. The excited vibration characteristics are analyzed for the two cases where the fixed center shaft is assumed to be rigid and its elastic deformations are taken into account. Furthermore, we evaluated the maximum allowable vibration where the worst vibration amplitude is half of the bearing clearance. As a result, it was found that although the rotor-bearing system has a sufficient resistance to transverse excitation up to 4G, the resistance to angular excitation is as weak as 0.5 revolution/s in a low frequency-region of less than 200Hz. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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