Resonance Search Track and Dwell Vibration Testing
Resonance search track and dwell is an invaluable tool for automated fatigue testing. With it, critical resonances can be detected, and the controller can dwell at these resonances for a user-specified period. Adjustments can be made to the drive waveform frequency to track each resonance as fatigue causes a shift in the resonance’s frequency.
Uses
- Fatigue and durability testing
- Compliance to military standards, and other standards requiring resonance dwell testing
Features
- Transmissibility measurement with all of the sine features for sweeping and control
- Automatic detection and listing of resonances including frequency, amplitude, phase and Q factor
- Tracked or fixed frequency dwells
- Amplitude profile as acceleration, velocity, or displacement
- Dwell duration based on the number of cycles or time
- Dwell termination based on resonant frequency, changing by specified frequency amount (Hz), percent of the resonant frequency, and by amount (Hz) per minute. Also a change in the resonance amplitude ratio of greater than a specified dB factor.
A sine sweep measures the test article’s transmissibility function. The setup for the sine sweep has all of the features of the sine application with user settings for the start and finish frequencies, sweep rate, and spectrum frequency resolution. Once a measured transmissibility is measured then the resonance's frequencies are automatically detected, based on user-set criteria for the Q factor (or damping) and the transmissibility amplitude ratio.
The dwell duration is specified in either cycles or time duration, and the dwell is either a fixed dwell or a tracked dwell. The special tracking feature adjusts the drive frequency to track the resonance as its frequency changes during dwelling.
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| Resonance dwell provides a valuable test method for durability testing of components and assemblies. |
