Dynamic Random Analysis Overview

A dynamic random analysis measures the system’s response to stationary, random loads of known power spectral density (PSD). The load input is force or acceleration PSD over a range of frequencies. Because the spectral density curves are obtained by sampling over a period of time, the longer the sampling time, the more accurate the curve. Results are reported in terms of a response PSD.

In a dynamic random analysis, Creo Simulate calculates these power spectral densities and RMS values of displacements, velocities, accelerations, and stresses at points in your model in response to a load of specified PSD. Use a dynamic random analysis for the following cases:

• the loading of your model can be described statistically by a random process

• you are interested in evaluating RMS responses or power spectral densities

For base excitation only, you can direct Creo Simulate to calculate the modal mass participation factors to enable you to better assess the accuracy of your results. Creo Simulate also calculates all valid measures for dynamic random analyses that you have defined for the model. You can obtain results for the PSD of a quantity at a point by defining measures. You can also define measures that yield the RMS value or apparent frequency of a quantity.

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