The paper gives details of the way in which servo-mechanism techniques have been applied to accessory control problems. The emphasis has been on the correlation of theory with practice and typical results are given from tests on some 15 British gas-turbine engines. For completeness a brief introduction to the basic concepts is first dealt with, then examples are given of linear and non-linear theories applied to typical working systems.
It is pointed out that though the examples refer to hydraulic, mechanical, and thermodynamic processes the ideas may be carried forward into widely differing fields.
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