Loading...
Please wait, while we are loading the content...
Similar Documents
Analysis of in-flight vibration measurements from helicopter transmissions
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mosher, Marianne Huff, Ed |
| Copyright Year | 2004 |
| Description | In-flight vibration measurements from the transmission of an OH-58C KIOWA are analyzed. In order to understand the effect of normal flight variation on signal shape, the first gear mesh components of the planetary gear system and bevel gear are studied in detail. Systematic patterns occur in the amplitude and phase of these signal components with implications for making time synchronous averages and interpreting gear metrics in flight. The phase of the signal component increases as the torque increases; limits on the torque range included in a time synchronous average may now be selected to correspond to phase change limits on the underlying signal. For some sensors and components, an increase in phase variation and/or abrupt change in the slope of the phase dependence on torque are observed in regions of very low amplitude of the signal component. A physical mechanism for this deviation is postulated. Time synchronous averages should not be constructed in torque regions with wide phase variation. |
| File Size | 1117796 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040081233 |
| Archival Resource Key | ark:/13960/t9d55m01j |
| Language | English |
| Publisher Date | 2004-01-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Flight Tests Torque Systems Health Monitoring Helicopter Propeller Drive Vibration Measurement Data Processing Velocity Distribution Barszcz Maneuverability Fault Detection Gear Teeth Bevel Gears Oh-58 Helicopter Sensors Grid Generation Mathematics Transmissions Machine Elements Planetary Systems Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
