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Run a multi-sine test with up to 32 sine tones simultaneously

Fatigue testing may require multiple sine sweeps through the frequency range at different sweep rates. Use Sine-on-Sine to run a multi-sine vibration test and excite up to 32 sine tones simultaneously. Sine-on-Sine is one of the three mixed-mode testing modules in VibrationVIEW.

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Part number 9206


What is a Sine-on-Sine (Multi-Sine) Test?

Engineers often use a standard SRTD test to bring the device under test (DUT) to failure. For a fatigue test, they may need to run multiple sweeps through the frequency range at different sweep rates. The time required to do so can exceed tens of hours.

With a multi-sine vibration test, the engineer can run multiple sine tones at different rates simultaneously. This feature saves time for engineers running fatigue testing and allows for the excitation of multiple resonant frequencies at once.

Easy Test Entry

Enter frequency or amplitude breakpoints of the background random acceleration spectrum in an easy-to-read, tabular format. You can use frequency or amplitude breakpoints or enter one endpoint and the desired dB/octave slope. VibrationVIEW supports 1,024 breakpoints, suitable for virtually any test specification.

Multiple Sine Tones

1 to 32 true floating-point precision sine tones can be superimposed on the background random spectrum and swept back-and-forth between frequencies at a user-programmable rate. The amplitude and frequency sweep parameters are all user-programmable.

Input Configuration

Configure up to 512 input channels with multi-channel averaging or multi-channel extremal control. The standard frequency range of DC-4,990Hz 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.

Sine Sweep

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.

Additional Features

  • Specify linear or logarithmic sweeps.
  • Change the sweep type while the test is running.
  • Easily repeat tone sequences with the looping function.
  • Set individual sweep rates and tolerances by segment.

What is Sine Resonance Track & Dwell (SRTD)?

Shift in Resonance Frequency Graph

A test engineer may run a sine resonance track & dwell (SRTD) after they have determined the resonances of a test item with a sine sweep. SRTD is meant to bring a product to failure by exciting a known resonance.

During a sine dwell test, the vibration controller runs a single sine tone at the product’s resonant frequencies rather than sweeping through the frequency range. A product experiences the most fatigue when exposed to its natural resonance. The test is run until failure occurs, or sufficient time has passed without failure.

Sine Resonance Phase Track & Dwell Software

VibrationVIEW SRTD logo

Transmissibility peaks can be automatically detected from a sine sweep, and then dwell tests run at the detected resonance frequencies for a specified time duration or number of sine wave cycles. In a sine dwell test, the controller can automatically track the resonance frequency to keep the output on resonance even when fatigue damage causes the resonance frequency to shift. Track High Q or sharp resonances with advanced phase tracking controls that allow you to dial in on resonance and maintain peak amplitude by way of Phase vs. Transmissibility.

Fundamentals of VibrationVIEW - Sine Resonance Track & Dwell plus High Q Sine Testing thumbnail

Fundamentals of VibrationVIEW - Sine Resonance Track & Dwell plus High Q Sine Testing

Additional Features

  • Configurable Safety Limits: Configurable acceleration limits, line limits, and drive limits can be set by the user to protect the test article and shaker system. The control input is also verified against shaker acceleration limits.
  • Test & Level Scheduling: Tests can be scheduled to run a user-defined length of time, the spectrum level can be scaled by a specified dB-level, percentage, or scaled for a specified RMS acceleration. Level schedules can be entered to run various durations at different acceleration levels.
  • Data Plots: Available graph display options include acceleration spectral density, output voltage spectral density, and channel-to-channel transmissibility. Graphs can be easily auto-scaled, and cursor display can be adjusted. Data and text annotations can be easily placed on the graphs, and data values update live with changes.

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