Dynamic measurements of a large diesel engine using p.r.b.s. techniques Part 1. Development of theory for closed-loop sampled systems

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Abstract
In attempting to identify the dynamic characteristics of a large medium-speed diesel engine using pseudo-random binary sequence (p.r.b.s.) and cross-correlation techniques inconsistent results were obtained. The cause of these is due to the sampled-data nature of the diesel engine operation and the difficulties were compounded by having to run so large an engine under closed-loop control conditions for safety reasons. Part 1 of this paper identifies the source of such problems arising from the use of such techniques for investigating sampled-data systems and develops a variation of the conventional theory which allows a wide class of both open and closed-loop sampled systems to be identified. Part 2 of the paper is concerned with the application of this theory to extensive measurements of a large engine.

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