Long, Tammy (1996) Adaptive control of a tuned pneumatic neutraliser. University of Southampton, Doctoral Thesis.
Abstract
This thesis details the design, implementation and control of a system for use in the semi-active control of mechanical vibrations. The aim is to minimise the tonal vibrations of a host structure by employing an adaptive vibration neutraliser whose natural frequency is tuned actively by adjusting the pressure in a pneumatic spring.
Previous work has resulted in the manufacture of a pneumatic neutraliser that can be manually tuned using open-loop control. The work contained in this thesis reports on the automation of this system and also on the development of a closed-loop control system. A two-tier approach was finally implemented, with coarse adjustment using open-loop control and a fine tuning algorithm to make more accurate adjustments.
After testing a single neutraliser, the use of multiple neutralisers was investigated. A decentralised control scheme was devised. The level of interaction between two neutralisers was theoretically determined and a method for minimising this interaction developed. An experimental investigation of multiple neutralisers was also undertaken. This confirmed the theory that showed there was little interaction between the neutralisers.
Substantial reductions in vibration of the host structure were attained, but were ultimately limited not by the control algorithm, but by the relatively high damping factor of the pneumatic vibration neutralisers.
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