Abstract
The Sine‐on‐Random VibrationVIEW software can run Sine‐on‐Sine tests.
QUESTION
A customer asked for help setting up a Sine‐on‐Sine test to match a test specification. They were familiar with the Sine‐on‐Random and Random‐on‐Random test modes from Vibration Research but were wondering what they needed to run a Sine‐on‐Sine test.
ANSWER
To run a Sine-on-Sine test, you must have the VibrationVIEW Sine‐on‐Random test module. Select New Test in the VibrationVIEW software. Then, select the Sine on Sine test option.
Sine on Sine test option in VibrationVIEW.
Table tab in the Sine on Sine Test Settings dialog.
Navigate to the Schedule tab, and select the Sine‐on‐Sine (S-o-S) checkbox. From here, you can enter the length of the test as a “Run for” level and insert additional test levels.
S-o-S test option in the Schedule tab.
Navigate to the Sine‐on‐Random (S‐o‐R) tab and verify that the Sine-on-Sine mode checkbox is selected. Then, you can enter the test’s sine tones up to a maximum of 32. Add tones with the Insert Tone button.
Insert Tone button in the S-o-R tab.
The software has many options for running sine tones, including:
- Sweep Down from
- Hold at
- Sweep Up from
- Harmonic
The Hold at option holds the test at the desired frequency with a desired amplitude. For the Sweep up from and Sweep down from options, the engineer manages a table to select the frequency range of the sweep, the sweep rate, and starting and ending amplitudes.
The Harmonic option works in conjunction with one of the other three options. The engineer sets an initial fundamental frequency and amplitude, then selects Harmonic and a multiplier for the fundamental frequency and amplitude. The following screengrab of the software is an example of how to use the Harmonic option:
Example of the Harmonic test option.
In this example, the fundamental frequency is 100 Hz with subsequent harmonics at 2, 3, 4, and 5 times the fundamental frequency. The subsequent tones will be at 200, 300, 400, and 500 Hz, respectively.
At the bottom of the S‐o‐R tab window are the required gRMS, velocity RMS, and displacement for the given set of test conditions.
After these steps are completed, you are ready to run your Sine‐on‐Sine test. Select OK to save and begin the test.
Note: the Parameters tab allows you to further edit the test settings for a Sine‐on‐Sine test.