A vibration controller feature used within a closed-loop test system to drive shakers by generating a profile that combines broadband random excitation with multiple narrow-band signals.
Random-on-random
Random-on-random (RoR) control simulates real-world complex vibration environments with a combination of a broadband random signal and one or more superimposed random narrow-bands. Both signal types are usually present simultaneously and the narrow-bands can appear at fixed frequencies or sweep over a predefined range. The overall random PSD (power spectral density) shifts with time or is related to a variable-speed device.
In RoR, a more complex function of the basic random control profile, all resonant frequencies of any given payload are excited at once; thus, it is well suited for product qualification and fatigue tests. A typical example is the repetitive stress on a truck’s headlights, as the vehicle changes speed while travelling on rough terrain.
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