Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
Identification and Its Evaluation of the System with a Nonlinear Element by Signal Compression Method
Min Cheol LEENobuharu AOSHIMA
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1989 Volume 25 Issue 7 Pages 729-736

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Abstract

The signal compression method was applied for a measurement of impulse responses of nonlinear systems. The “impulse response” means the impulse response of linear element in the nonlinear system.
The experimental system (1) consists of a pendulum, electric magnetic valves and a computer. The pendulum is applied torque by air jet controlled by the electric magnetic valves. The experimental system (2) consists of 2nd-order electric circuits with dead band.
We could obtain the impulse responses of these systems free from nonlinear disturbance. System parameters were estimated by comparing measured Bode diagrams and those of models.
This method gave better results of identification than by least-square method and adaptive digital filter method. Discussions are made about possibility of applying this method to nonlinear control system identification.

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