Hydrostatic Bearing System - Cooling Pump Flutter

  • HBS system:
    img_0282.jpg

  • Location: LBT Room 402

Measurement Info

  • Measurements acquired October 25, 2009

  • HBS cooling pumps 1&2. Accelerometer attachment points:
    hbs_cooling_pumps.jpg

  • Two 1-kHz, 100-second data sets at indicated location:

  • A/D Channel assignments:

Accelerometer Location Channel (data column) Axis
PCB 356B18 (serial number 36120) Cooling pump 1 0 X
1 Y
2 Z
PCB 356B18 (serial number 87536) Cooling pump 2 3 X
4 Y
5 Z

  • Acceleration data high-pass filtered at 0.1-Hz or 1.0-Hz during post-processing to supress low frequency drift in integrated data (velocity, displacement)

  • Bode plot of 4-pole high-pass filters (0.1-Hz, 1.0-Hz):

high_pass_bode.jpg

Accelerometers

  • PCB 356B18 (serial number 36120) triaxial shear-type accelerometer

  • PCB 356B18 (serial number 87536) triaxial shear-type accelerometer

  • Measured with UEI DNA-PPC5 data acquisition system with UEI DNX-AI-207 analog input card

Time History

  • Cooling pump 1 acceleration time history; (no anomaly).:
    time_history_00.jpg

  • Cooling pump 2 acceleration time history; (with anomaly).:
    time_history_01.jpg

  • Note "flutter" of cooling pump-2 at 20-seconds, 54-seconds, and 67-seconds.

  • Zoom time history of cooling pump 2 flutter at 20-seconds:
    time_history_02.jpg

  • Zoom time history of cooling pump 2 flutter at 54-seconds:
    time_history_03.jpg

  • Zoom time history of cooling pump 2 flutter at 67-seconds:
    time_history_04.jpg

Cooling Pump 1 and Cooling Pump 2 - X-axis Comparison

Acceleration Spectral Density

  • Acceleration spectral density for HBS cooling pumps 1&2. X-Axis.:
    Paa_x00.jpg

  • Acceleration spectral density forward-sum for HBS cooling pumps 1&2. X-Axis.:
    fwd_Paa_x00.jpg

Cooling Pump 1 and Cooling Pump 2 - Y-axis Comparison

  • Cooling pumps are likely operating under different loads or performing different tasks, resulting in different acceleration noise profiles. They may also be mechanically different in operation.

Acceleration Spectral Density

  • Acceleration spectral density for HBS cooling pumps 1&2. Y-Axis.:
    Paa_y00.jpg

  • Acceleration spectral density forward-sum for HBS cooling pumps 1&2. Y-Axis.:
    fwd_Paa_y00.jpg

Cooling Pump 1 and Cooling Pump 2 - Z-axis Comparison

Acceleration Spectral Density

  • Acceleration spectral density for HBS cooling pumps 1&2. Z-Axis.:
    Paa_z00.jpg

  • Acceleration spectral density forward-sum for HBS cooling pumps 1&2. Z-Axis.:
    fwd_Paa_z00.jpg

Cooling Pump 2 Flutter

X-axis

  • Pump 2 flutter PSD waterfall plot. X-axis.:
    Paa_waterfall_000.jpg

Y-axis

  • Pump 2 flutter PSD waterfall plot. Y-axis.:
    Paa_waterfall_001.jpg

Z-axis

  • Pump 2 flutter PSD waterfall plot. Z-axis.:
    Paa_waterfall_002.jpg

PSD comparisons inside-and-outside of anomaly (1000-pt PSD, 1-kHz sample rate, minimal averaging)

X-axis

  • Cooling pump 2 anomaly at 20-seconds.:
    Paa_flutter_20s_00.jpg

  • Cooling pump 2 anomaly at 20-seconds (psd fwdsum).:
    fwd_Paa_flutter_20s_00.jpg

Y-axis

  • Cooling pump 2 anomaly at 54-seconds.:
    Paa_flutter_54s_00.jpg

  • Cooling pump 2 anomaly at 54-seconds (psd fwdsum).:
    fwd_Paa_flutter_54s_00.jpg

Z-axis

  • Cooling pump 2 anomaly at 67-seconds.:
    Paa_flutter_67s_00.jpg

  • Cooling pump 2 anomaly at 67-seconds (psd fwdsum).:
    fwd_Paa_flutter_67s_00.jpg
I Attachment Action Size Date Who Comment
DNA_PPC5_004_data.txttxt DNA_PPC5_004_data.txt manage 8 MB 16 Nov 2009 - 21:30 UnknownUser 1-kHz, 100-seconds raw Voltage data; (set 1 of 2 at this location)
DNA_PPC5_005_data.txttxt DNA_PPC5_005_data.txt manage 8 MB 16 Nov 2009 - 21:39 UnknownUser 1-kHz, 100-seconds raw Voltage data; (set 2 of 2 at this location)
Paa_flutter_20s_00.jpgjpg Paa_flutter_20s_00.jpg manage 246 K 17 Nov 2009 - 00:54 UnknownUser Cooling pump 2 anomaly at 20-seconds.
Paa_flutter_54s_00.jpgjpg Paa_flutter_54s_00.jpg manage 255 K 17 Nov 2009 - 00:55 UnknownUser Cooling pump 2 anomaly at 54-seconds.
Paa_flutter_67s_00.jpgjpg Paa_flutter_67s_00.jpg manage 255 K 17 Nov 2009 - 00:55 UnknownUser Cooling pump 2 anomaly at 67-seconds.
Paa_waterfall_000.jpgjpg Paa_waterfall_000.jpg manage 204 K 17 Nov 2009 - 00:51 UnknownUser Pump 2 flutter PSD waterfall plot. X-axis.
Paa_waterfall_001.jpgjpg Paa_waterfall_001.jpg manage 215 K 17 Nov 2009 - 00:52 UnknownUser Pump 2 flutter PSD waterfall plot. Y-axis.
Paa_waterfall_002.jpgjpg Paa_waterfall_002.jpg manage 198 K 17 Nov 2009 - 00:52 UnknownUser Pump 2 flutter PSD waterfall plot. Z-axis.
Paa_x00.jpgjpg Paa_x00.jpg manage 424 K 17 Nov 2009 - 00:31 UnknownUser Acceleration spectral density for HBS cooling pumps 1&2. X-Axis.
Paa_y00.jpgjpg Paa_y00.jpg manage 423 K 17 Nov 2009 - 00:32 UnknownUser Acceleration spectral density for HBS cooling pumps 1&2. Y-Axis.
Paa_z00.jpgjpg Paa_z00.jpg manage 436 K 17 Nov 2009 - 00:32 UnknownUser Acceleration spectral density for HBS cooling pumps 1&2. Z-Axis.
fwd_Paa_flutter_20s_00.jpgjpg fwd_Paa_flutter_20s_00.jpg manage 230 K 17 Nov 2009 - 00:56 UnknownUser Cooling pump 2 anomaly at 20-seconds (psd fwdsum).
fwd_Paa_flutter_54s_00.jpgjpg fwd_Paa_flutter_54s_00.jpg manage 234 K 17 Nov 2009 - 00:56 UnknownUser Cooling pump 2 anomaly at 54-seconds (psd fwdsum).
fwd_Paa_flutter_67s_00.jpgjpg fwd_Paa_flutter_67s_00.jpg manage 234 K 17 Nov 2009 - 00:57 UnknownUser Cooling pump 2 anomaly at 67-seconds (psd fwdsum).
fwd_Paa_x00.jpgjpg fwd_Paa_x00.jpg manage 381 K 17 Nov 2009 - 00:33 UnknownUser Acceleration spectral density forward-sum for HBS cooling pumps 1&2. X-Axis.
fwd_Paa_y00.jpgjpg fwd_Paa_y00.jpg manage 382 K 17 Nov 2009 - 00:33 UnknownUser Acceleration spectral density forward-sum for HBS cooling pumps 1&2. Y-Axis.
fwd_Paa_z00.jpgjpg fwd_Paa_z00.jpg manage 417 K 17 Nov 2009 - 00:34 UnknownUser Acceleration spectral density forward-sum for HBS cooling pumps 1&2. Z-Axis.
hbs_cooling_pumps.jpgjpg hbs_cooling_pumps.jpg manage 49 K 16 Nov 2009 - 21:25 UnknownUser HBS cooling pumps 1&2. Accelerometer attachemnt points.
high_pass_bode.jpgjpg high_pass_bode.jpg manage 270 K 17 Nov 2009 - 23:49 UnknownUser Bode plot of high-pass filters (0.1-Hz, 1.0-Hz)
img_0282.jpgjpg img_0282.jpg manage 5 MB 16 Nov 2009 - 21:13 UnknownUser HBS system
time_history_00.jpgjpg time_history_00.jpg manage 287 K 16 Nov 2009 - 22:00 UnknownUser Cooling pump 1 acceleration time history; (no anomaly).
time_history_01.jpgjpg time_history_01.jpg manage 194 K 16 Nov 2009 - 22:02 UnknownUser Cooling pump 1 acceleration time history; (with anomaly).
time_history_02.jpgjpg time_history_02.jpg manage 387 K 16 Nov 2009 - 22:10 UnknownUser Zoom time history of cooling pump 2 flutter at 20-seconds
time_history_03.jpgjpg time_history_03.jpg manage 362 K 16 Nov 2009 - 22:12 UnknownUser Zoom time history of cooling pump 2 flutter at 54-seconds
time_history_04.jpgjpg time_history_04.jpg manage 362 K 16 Nov 2009 - 22:15 UnknownUser Zoom time history of cooling pump 2 flutter at 67-seconds
Topic revision: r3 - 17 Nov 2009, JorgeEsguerra
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki? Send feedback