Random-on-random Vibration Control
Random-on-random vibration simulates the vibration environment in any structure in which the overall random PSD is related to a variable speed device, or shifts with time, such as in military tracked vehicles. The vibration stress on a truck’s headlights while the it changes speed over a rough highway would be best simulated using random-on-random.
Uses
- Simulation of vibration characterised by broadband random with one or more superimposed narrowbands
- Military tracked vehicles or propeller-driven aircraft
- Truck vibration during speed changes
Features
- General features of random software are included
- Up to 12 narrowbands
- Narrowbands may sweep or be fixed with harmonic or non-harmonic sweeps
- Amplitude-frequency profile for each narrowband with PSD amplitudes and frequencies plus slopes with automatic crossover calculation
- Manual switch control of individual narrowbands during a test
- Choice of summing method for narrowbands and broadband
In random-on-random, the broadband random is a user-specified breakpoint table of power spectral density versus frequency, as in the random software. Each narrowband has an independently set PSD amplitude, frequency sweep range, and sweep rate. The user can also define a profile of the PSD amplitude profile versus frequency. Narrowband can sweep independently or in a harmonic mode.
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| Random-on-random simulates vibration environments inside tracked vehicles, propeller driven aircraft, and trucks driving on a highway. |
