Disturbance feedforward control for active vibration isolation systems with internal isolator dynamics

Abstract

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Filtered-error RLS for self-tuning disturbance feedforward control with application to a multi-axis vibration isolator

“…However, a discrete-time implementation of ( 6) could result in a non-causal and unstable feedforward controller due to time delays and non-minimum phase zeros in 𝐏 𝟐 . In practice, the aim is therefore to obtain the best causal and stable approximation of ( 6), see, e.g., [4,8]. For the hardmount system considered in this paper, such an approximation is derived in [16] by means of a feedforward controller using spring-damper compensation:…”

“…A hard-mount suspension with disturbance feedforward control combines a low compliance to internal forces with a low transmissibility of floor vibrations [3]. Disturbance feedforward control (DFC) [4], also referred to as active vibration control [5], employs floor-mounted sensors to generate actuator forces that counteract the effect of floor vibrations. The required counter force is predicted from a model of the isolator dynamics.…”

Analysis of Dynamic Parameters of a Railway Bridge

“…In the theoretical model [24][25][26][27], errors of measurement of digital vibration signals are assumed to be random and systematic.…”

Passive and active vibration isolation under isolator-structure interaction: application to vertical excitations

“…The control force in AVI systems is not only generated as a reaction of the relative movement between base and platform but an actuator is located between them, allowing application of an additional control force by the use of feedback or feedforward control techniques. This makes AVI systems the most suitable for many applications [2,16,18,25]. However, it is necessary to deal with some additional challenges of AVI, such as instability of the control system, real-time signal processing, the inherent isolator dynamics and the influence of the control force on the support structure.…”