After determining transmissibility peaks, run a dwell test at resonant frequencies for a specified time duration or number of sine wave cycles. Sine resonance track & dwell (SRTD) excites the known resonance until failure or sufficient time has passed without failure. SRTD is a Sine software add-on.
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Configure up to 512 input channels with multi-channel averaging or multi-channel extremal control. The standard frequency range is DC-4,990Hz, which can be extended up to 50,000Hz with the VR9103 High-Frequency option.
VibrationVIEW supports multiple control input channels (multi-channel extremal) when using the highest, lowest, or average accelerometer readings for test control. Input channels can have individual tracking filters to remove harmonics and out-of-band noise from measurements.
Run sequences of fixed-frequency tones of a specified acceleration, velocity, or displacement. Test duration options include the length of time, the number of sine wave cycles, and the number of sweeps.
A configurable large numeric readout displays the current test frequency and channel amplitudes. Use the manual control to manually control the sweep direction, sweep rate, and scale the amplitude with your mouse cursor.
The controller can be configured to abort if the controlled acceleration goes above or below the desired level by an operator-configured number of dB. Abort limits can also be enabled for individual monitoring channels. Drive limits can be configured to protect from overdriving your shaker in case of failed accelerometers.
The user can manually change SRTD settings during a test and receive feedback on current test settings in the SRTD Controls dialog box.
The time-based SRTD graphs display long-term changes in the resonance frequency due to fatigue or product temperature. The phase-based SRTD graphs have a custom layout.
An SRTD test brings a product to failure by exciting a known resonance. The vibration controller runs a single sine tone at the product’s resonant frequencies rather than sweeping through the frequency range.
During a sine dwell, the controller can automatically track the resonance frequency so that the output remains on the resonance even if fatigue damage shifts the resonance frequency. In VibrationVIEW, track high-Q or sharp resonances with advanced phase tracking controls that allow the user to dial in on resonances and maintain peak amplitude by way of phase versus transmissibility.
Peak tracking in VibrationVIEW automatically shifts resonances by finding and maintaining the peak transmissibility between two channels.
Peak tracking oscillates the phase between the two channels and observes increases or decreases to the peak transmissibility. As more data is collected, the phase change becomes narrower in frequency and slower in time. This change limits the amount of oscillation while accurately tracking the peak.
This powerful feature minimizes the need for precise detection during the sine sweep so the user can sweep faster. Most importantly, it maintains peak transmissibility throughout the tracked dwell portion of the test.
A sine sweep test may display oscillations in the presence of high-Q resonances. The engineer can address the oscillations in several ways, such as adjusting the response time or tracking filters. However, in some situations, these parameters are fixed and cannot be adjusted. In such instances, the user can use the Adaptive Feedback option.
Adaptive feedback allows for tighter control while limiting problems in a resonance. A majority of the test only requires one set of test settings. As the test sweeps through the resonance and begins losing control, the software automatically adjusts the response time and slew rate to more appropriate settings. Adjustments may include:
Adaptive feedback has a low, medium, or high setting. Alternately, the user can select manual control. We recommend using the manual settings as a last option.
