27 February

Random Acoustic Loading DTE blog fig 1Working with long duration transient events in a finite element world can be extremely computationally expensive.  If those events are very long, like the wheel hub forces over the lifespan of a vehicle, then it is impossible to simulate.  One technique to overcome this limitation is to use something called Random Loading, or Random Analysis.

If a time signal can be considered properly random then it can be transformed from the time to the frequency domain and is known as a Power Spectral Density plot, or PSD.  A quick check of randomness is that any section of a time history transformed in this way should give the same outcome as the whole signal.  These PSD’s are best thought of as a statistical representation of the amount of energy in the signal as a function of frequency.

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