Design of active vibration isolators impedance matching techniques and power concepts

David, Antoine Michel (1999) Design of active vibration isolators impedance matching techniques and power concepts. University of Southampton, Doctoral Thesis.

Abstract

This thesis describes the necessary steps to be undertaken to design an active vibration isolator. Literature review of the isolation, active vibration control and active vibration isolation literature was made to identify the requirements for actuation, isolation, coupling and the variable or quantity to be minimised.

Two simulation models of active vibration isolator configuration were set up, seismic and opposing force. The seismic actuator model consisting of an active force reacting against a mass, and, the opposing force actuator which is composed of an active element producing two directly opposite forces by the train of the active element. A zero transmission condition was derived to require the active force to cause zero transmitted force for a given machinery disturbance velocity. This equation, when approximated to the low frequency behaviour, provides the basis for design for each model.

The main outcome from these models are that for the seismic model the active force is best applied onto a receiving structure while for the opposing force model the active force is best applied directly between the receiving structure and the machinery in parallel to the passive isolator. The opposing force model predicts that best results are achieved when the impedance of the passive isolator matches the internal impedance of the active component. These models show where the native forces are best applied but do not describe the amount of power needed to stop the vibration transmission. An investigation was conducted to determine the power requirements.

This record has no associated files available for download.

Contributors

Download statistics