Loading...
Please wait, while we are loading the content...
Similar Documents
Vibration based crack detection in a rotating disk. part 2; experimental results
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Martin, Richard E. Haase, Wayne C. Baaklini, George Gyekenyesi, Andrew L. Sawicki, Jerzy T. |
| Copyright Year | 2005 |
| Description | This paper describes the experimental results concerning the detection of a crack in a rotating disk. The goal was to utilize blade tip clearance and shaft vibration measurements to monitor changes in the system's center of mass and/or blade deformation behaviors. The concept of the approach is based on the fact that the development of a disk crack results in a distorted strain field within the component. As a result, a minute deformation in the disk's geometry as well as a change in the system's center of mass occurs. Here, a notch was used to simulate an actual crack. The vibration based experimental results failed to identify the existence of a notch when utilizing the approach described above, even with a rather large, circumferential notch (l.2 in.) located approximately mid-span on the disk (disk radius = 4.63 in. with notch at r = 2.12 in.). This was somewhat expected, since the finite element based results in Part 1 of this study predicted changes in blade tip clearance as well as center of mass shifts due to a notch to be less than 0.001 in. Therefore, the small changes incurred by the notch could not be differentiated from the mechanical and electrical noise of the rotor system. Although the crack detection technique of interest failed to identify the existence ofthe notch, the vibration data produced and captured here will be utilized in upcoming studies that will focus on different data mining techniques concerning damage detection in a disk. |
| File Size | 7525036 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20130013094 |
| Archival Resource Key | ark:/13960/t9p31vd0m |
| Language | English |
| Publisher Date | 2005-09-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Finite Element Method Blade Tips Rotor Dynamics Rotating Disks Center of Mass Vibration Measurement Feasibility Analysis Cracking Fracturing Detection Vibration Tests Data Mining Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
