HIGH CYCLE FATIGUE AND RESONANCE DWELL TESTING
Dwelling at resonance is the ideal way to put a structure through low- or high- cycle fatigue testing. Assessing the lifecycle of a product or component using its own resonances as excitation is simpler than ever with the 900 Series Vibration Controller
Resonance Dwell testing starts out as a dwell at a structure’s resonance – but as the part fatigues or otherwise dynamically changes, the dwell frequency is shifted, and the dwell remains at the resonant frequency. Resonance Dwell Testing is commonly used for fatigue (low- or high- cycle) testing, or to assess the lifetime of a product such as a turbine blade.
Resonance Dwell Testing of Turbine Blades
Turbine blades are some of the toughest to control, high Q resonances. Data Physics Controllers and Shakers offer the best control over lightly damped resonance structures because of their optimized sine control loop, and their renowned algorithms.
In the adjacent photo, a turbine blade is being excited at its resonance with simultaneous thermal cycling.
Resonance Dwell Features
The 900 Series controller software offers advanced Resonance Dwell features that execute control over the toughest, highest-Q structures and accommodate a wide variety of test requirements. Our third generation of Resonance Dwell software is not only technically superior, it also streamlines testing.
Optimized control loop
Ultra-fast closed loop control for control of lightly damped resonances
Long Test Durations
Tests can execute for days, weeks, or longer – data is saved throughout the entire dwell
Customizable Control Channels
Specify different channels for the baseline sine sweep and the controlled dwell. Run a baseline sine sweep with an accelerometer, and switch control to a vibrometer or other sensor during the resonance dwell
Use Any Sensor
Compatible with accelerometers, laser vibrometers, strain gauges, and other sensors
Manual Ramp Up
Manually bring up the dwell level slowly to prevent overshoot
Flexible Dwell Definition
Specify Dwell level in displacement, velocity, or acceleration – or use a breakpoint table as the dwell profile
Manual Mode Controls
Change the dwell level or duration live during test with the Manual Mode controls
Automated Resonance Search
Pre-define resonance search criterion and allow the test to run fully automated. Multiple resonances can be identified and corresponding dwells can run sequentially – all automated
Test Automation and Sequencing
Run a Resonance Dwell test as a part of a larger test schedule that includes other test types. Interact with a thermal chamber to automate complex thermo-vibe tests
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Integrated Strain Signal Conditioning
- Minimize cost by eliminating external strain signal conditioners
- All voltage/ICP and strain channels are configured in one software interface and forms a single synchronized data set
- Supports quarter/half/full bridge strain gauges, bridge sensors, or traditional ICP/IEPE voltage sensors
- Strain channels can be used for measurement or control
- Record time history data on all voltage/strain channels in parallel with the test
