SIGNAL PROCESSING MEANS FOR IDENTIFYING SYSTEMS SUBJECT TO PERIODIC DISTURBANCES

摘要

In a signal processing system for a plant such as a motor or machine, subject to disturbances which are approximately periodic and wherein a signal (T(t)) time related to the disturbances is available, the plant response is sampled in an ADC triggered by the signal (T(t)) in order to synchronise the sampling process with the cyclic disturbances, and a processing means derives from the sampled signals an estimate of the disturbances and thereby of that part of the plant output due to unknown inputs (Fig. 2), the estimate of disturbances possibly being used to drive an active vibration control system employed in combination with the sampling system.