A comparison of human response modeling in the time and frequency domains
Lawrence W. Taylor · NASA STI Repository (National Aeronautics and Space Administration) · 1967
Frequency and time domain methods of analyzing human control response while performing compensatory tracking tasks are reviewed.Sample linear model results using these methods are compared and discussed.The inherent requirement of constraining the freedom of the form of the pilot models is also discussed.The constraint in the frequency domain consists of smoothing w4'th respect to frequency; whereas, the constraint for the time: domain model is more natural and meaningful in that it consists simply of Limiting the memory of the pilot model.**. he linear models determined by both methods were almost identical.The time domain method of analysis enables the determination of a nonlinear pilot model, The inclusion of a cubic as well as a linear term accounted for only a small additional part of the pilot's remnant and indicated that only a small portion of the total power of the pilot's output is caused by nonlinearities.The power-spectral density of an ensemble average of the pilot's output is used to determine the upper limit of the amount of power associated with a deterministic response.The indication is that more than half the remnant is stochastic when a linear model is used.