Sine-on-random Vibration Control
Sine-on-random simulates complex vibration environments with a combination of broadband random vibration and sinusoids or 'tones'. Generally, both signal types are present simultaneously, and the tones may appear at either fixed frequencies or they may sweep over a frequency range. One common example is the vibration from an automobile drivetrain as the vehicle accelerates and the gear ratio is changed. Another example is periodic bursts of gunfire from a flying helicopter, which add new vibration patterns to the existing ones.
Uses
- Simulation of vibration characterised by broadband random with one or more superimposed tones
- Gunfire from helicopters or propeller driven aircraft
- Automobile vibration in the engine, drive train, and transmission during speed changes
Features
- General features of random and sine software are included
- Time domain-generated true sine tones (not created by FFT method)
- Digital tracking filter for each tone
- Up to 20 sine tones
- Tone may sweep or be fixed with harmonic or non-harmonic sweeps
- User-set on and off duration for each tone
- Amplitude-frequency profile for each tone with constant acceleration, velocity, or displacement segments plus slopes with automatic crossover calculation
- Manual switch control of individual tones during a test
- Sine-on-sine test capability
- Separate sine tone track display for test validation
In sine-on-random, the broadband random is a user-specified breakpoint table of power spectral density versus frequency, as in the random software. Each sine tone has an independently set amplitude, frequency sweep range, and sweep rate. The user can also define a sine sweep profile versus frequency in constant acceleration, velocity, and displacement segments. Sine tone sweeps can be constrained to be harmonically related. To simulate gunfire, the software allows pre-programmed on and off periods for the sine tones.
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| Sine-on-random simulates a broad range of vibration environments from automotive vehicles to helicopter gunfire. |
