ANSYS Mechanical Solutions - Technology

Random Vibration Analyses

Used to determine the response of structures to random or time-dependent loading conditions such as earthquakes, wind loads, ocean wave loads, jet engine thrust, rocket motor vibrations etc., ANSYS random vibration analyses can be much less computationally intensive than a full transient dynamic analysis while still providing design guiding results.  Types of random vibration analyses are:

Response Spectrum – Single and Multi-Point base excitation in which the results of a modal analysis are used with a known spectrum to calculate the model’s displacements and stresses. Dynamic Design Analysis Method – Typically identified with the acronym DDAM, this is a technique used to evaluate the shock resistance of shipboard equipment.  It is very similar to the Response Spectrum methods mentioned above, with the principle difference being the loading is derived from empirical equations and shock design tables.

Power Spectral Density - (PSD) is a statistical based random vibration method in which the input load histories are specified based on a probability distribution of the loading taking that particular value.  An example application is the calculation of the probable response of a sensitive automotive electronic component to the engine and drive train vibrations while the vehicle travels rapidly down a rough road.

Exhaust manifold/Catalectic Converter assembly model utilized in PSD Random Vibration analysis

ANSYS Advantage: Time saving, mature structural dynamics analysis types in ANSYS quickly guide product development efforts