A Method for Shaker Validation
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1 A Method for Shaker Validation Today s Presenter: Joel Minderhoud We will begin shortly!
2 A Method for Shaker Validation To obtain a copy of these Slides: salesreport@vibrationresearch.com Tech Support: Ph: support@vibrationresearch.com Visit Us Online at: If you have an idea for a webinar, let us know!
3 Meet VR Joel Minderhoud Research Scientist
4 A Method for Shaker Validation 1. Need to Evaluate the Health of Shaker System 2. Use of System Check as a Method for Shaker Validation 3. Recommended Method for Shaker Validation Sine Sweep Total Harmonic Distortion Evaluation Tool
5 Need for Shaker Validation Are your test results indicative of vibrations experienced by your product?
6 Need for Shaker Validation Or is your shaker introducing vibrations into your test results? Damaged Armature Damaged Flexure/Roller bearings When is the last time you checked if your shaker system was operating according to specifications?
7 Need for Shaker Validation How often should I run a Shaker Validation Test? Make it a routine task Regularity of validation test should be test-facility driven according to your needs and preferences Monthly? Quarterly? How similar should physical set-up be for Shaker Validation Test? As identical as possible Bare shaker head!! Head expander only Fixture only
8 System Check and Sine Sweep Examples Bare Table vs. Loose Wrench (Simulation Test)
9 System Check Always begin tests with System Check Check for properly attached accelerometers/cables Make sure shaker performs as software requires VR displacement wedge blog/displacement-wedge-whatis-it-how-to-use-it
10 System Check Helpful to evaluate the health of shaker system Acceleration Spectrum
11 System Check Helpful to evaluate the health of shaker system Acceleration Waveform
12 Has Limitations Only a snap-shot at a specific frequency Does not employ tracking filters so the data at frequencies outside of setting is not as accurate as with sine sweep. System Check
13 Rationale: Recommended Method: Sine Sweep Relate to shaker manufacturer specs Obtain data about shaker across large frequency spectrum Many ways to evaluate data Particularly Total Harmonic Distortion (THD)
14 Recommended Method: Sine Sweep Traditional Sine Sweep Test Set-up Profile Schedule Sweep
15 Recommended Method: Sine Sweep Evaluate with ANALYZER Activate SWEPT THD (Total Harmonic Distortion) Use large number of lines Not affected by tracking filters
16 Total Harmonic Distortion THD Definition Comparison of all harmonic content in a signal to the fundamental V 2 2 +V 3 2 +V V n 2 % THD = X 100 V 1 V 1 is the fundamental s voltage signal (eg: 60 Hz) V 2, V 3 are the next harmonics (eg: 120 Hz, 180 Hz) The larger amount of harmonic content in a signal, the larger the % THD value will be Indicative of noise or undesired vibration in signal
17 THD Sample Results
18 THD Tolerance? THD Sample Results Rule of Thumb Less than 10% THD Test-facility needs to determine acceptable variance
19 System Check Sample Results
20 THD Sample Results Zoomed at 30 Hz (in order to compare with System Check)
21 THD Sample Results
22 A Method for Shaker Validation Other Analysis Options with Sine Sweep Many other graphs are available with Sine Sweep data Output Drive Transmissibility Phase
23 Output Drive A Method for Shaker Validation
24 Transmissibility A Method for Shaker Validation
25 Phase A Method for Shaker Validation
26 THD vs. System Check System Check is a good starting point Gives some indication of the health of shaker system Limited by the fact that it is a single snap-shot in time of a specific frequency Sine Sweep with Total Harmonic Distortion is better More accurate than System Check Because Tracking Filters are employed Because entire frequency spectrum is accurately analyzed More accurate than Random Not all frequencies simulataneously
27 A Method for Shaker Validation Benefits of Sine Sweep Analyzed with THD 1. Identifies possible issues across the entire frequency range of shaker system (using tracking filters) 2. Many other graphs are available with Sine Sweep data Output Drive Transmissibility Phase 3. Total Harmonic Distortion is easy to use and interpret
28 To obtain a copy of these Slides: Thank You for Attending! salesreport@vibrationresearch.com Tech Support: Ph: support@vibrationresearch.com Visit Us Online at:
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