Adaptive notch filter

摘要: The control of flexible systems is often difficult due to the exact frequencies elastic modes being hard identify. These may change over time, or vary between units same system. variation in modal dynamics cause a degradation performance even instabilities unless compensated for by scheme. Controllers designed these types use notch filters mode suppression. However parameters need wide filters. An adaptive scheme proposed which uses an online estimator based on plant parameterization. not probe signals and rely parameter identification unknown parameters. Instead it continuously update itself cancel effect been able identify filter can be narrower, adding less phase lag at lower frequencies, thereby allowing increase bandwidth disturbance rejection capability. Simulation experimental verification suppression given through laser beam pointing compared non-adaptive scheme, decrease standard deviation experimentally measured tracking error 14% when are unknown.