B Pearson Forum Presentation Scrubbed

XLX Vibration Testing Brandy Pearson 8/28/2007

Overview: XLX ,[object Object],[object Object],[object Object],[object Object],[object Object],Free Side Example of chamber lower cross-section ,[object Object],[object Object]

Sideview of Chamber ,[object Object],FAN Anode Support Bar (ASB) Lower Cutoff

Interesting FFT Components ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],FFT Spectrum

Minimizing Divergence/Pointing ,[object Object],[object Object],[object Object]

The Test Plan ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setup ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thermal Effects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Dominant Gas Effects ,[object Object],[object Object],46X 23X FFT

Sealed, Pressurized, Fan Design2, ASB: Forward vs. Backward ,[object Object],[object Object],[object Object],Dominant 46x peaks Low harmonics with high vibration -mechanical looseness Observe dominant 46x peaks running forward fan. No 23x or 46x peaks running backwards. Gas effects demonstrated to be caused by fan blade pass.

Sealed, Fan Design2, ASB: Unpressurized vs. Pressurized ,[object Object],[object Object],[object Object]

Sealed, Pressurized Design2 Fan: ASB vs. NO ASB lower 46X component large 23x contributor Investigating the effect of the ASB as an additional cutoff. ,[object Object],[object Object]

Open Lower: Fan Design2 vs. Fan Design1 Trial1 Fan Design2 Fan Design1 (s/n 1655 00013) *250rpm step CLAMPED SIDE Fan Design1 demonstrated much lower overall and gas induced vibration- low 23x and 46x components. ,[object Object],[object Object]

Open Lower: Fan Design2 vs. Fan Design1 Trial1 Fan Design2 Fan Design1 (s/n 1655 00013) 46X resonance lower 23X & overall total vibration *250rpm step FREE SIDE Double chevron, free side also demonstrates lower overall vibration levels and 23x.

Open Lower Double Chevron: Trial1 vs. Trial2 Trial1 Trial2 larger integrated vibration low 23X ,[object Object],[object Object],The overall integrated vibration increased for Trial2. Since 23x and 46x peaks appear comparable, seems that vibration increase due to mechanical sources not gas effects. 46X resonance

Open Lower Fan Design1: Trial 1 vs. Trial 3 Trial 1 *250rpm step ,[object Object],[object Object],[object Object],[object Object],Trial 3

Sealed, Pressurized Chamber with ASB: Design2 fan vs. Design1 fan lower 23X component ,[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lessons Learned ,[object Object],[object Object],[object Object],[object Object]

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