For a Dynamic Frequency analysis the loads are input as a function of frequency. This would be similar to doing a sine sweep test on a shaker table using pure sinusoidal input. The load may be Base Accelerations or Forces applied to the structure. Base Accelerations are applied to any Constraints or Springs-to-Ground. If more than one load is applied the phase of the load may be defined. A frequency response of amplitude and phase may be calculated at a particular location using a Measure or a snapshot of the full model maximum response at a frequency may be made. This type of analysis would be useful for simulating any sine sweep type test or the response of a structure to a cyclic load such as vibration induced by the imbalance of rotating equipment. This may also be useful for calculating the frequency bandwidth of a structure for servo control problems.
