FURTHER RESEARCH ON THE PREDICTOR INSTRUMENT
DUNLAP AND ASSOCIATES EAST INC NORWALK CT
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PREDICTION TIME SPAN The predictor, an instrument for use in manual control systems, was studied further concerning prediction span and relation to vehicle frequency and velocity. An unstable third-order tracking system was used to test the hypothesis that a good prediction span would be that at which output and its derivatives are weighted in the prediction in about the same ratio as in a good automatic controller for the same system. The hypothesis was proved incorrect the operator obtained information from the shape and movement of the predictor line so that his response contained the necessary derivative components. PREDICTOR DISPLAY TO CONTROL 2 DIMENSIONS A difficult 2-dimensional tracking system was devised for testing 3 display systems 1 the normal system of output-plus-derivative indicators in 2 dimensions 2 2 standard predictor displays, one for each dimension and 3 the spiral display on a 17-inch oscilloscope in which the size of the spiral represents time, the central point of the largest turn showing present output in 2 dimensions. An inexperienced subject, trained in the 3 systems, could maneuver the spiral display after 2 hr of practice the double predictor display cautiously at the end of training, driving the system about onethird the rates used with the spiral never mastering the normal displays.