Reference / Paper · 1964

System Response Analysis with the Analog Memory and Logic System

This EAI application note (Bulletin No. ALHC 64024) describes techniques for analyzing system response characteristics using a general-purpose analog computer equipped with EAI's Analog Memory and Logic System. The document covers three operating modes—real-time simulation, compressed time-scale, and high-speed operation—along with a stroboscopic plotting technique using analog memory units for recording high-speed repetitive solutions and a probability distribution analysis technique using Gaussian noise input.

Manufacturer: EAI
Year: 1964
Type: Reference / Paper
Language: English
Learning track: specific applications
Pages: 1
Credit: © Electronic Associates, Inc., 1964. All Rights Reserved. Bulletin No. ALHC 64024.

EAI
analog memory
system response analysis
stroboscopic plotting
probability distribution

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SYSTEM RESPONSE ANALYSIS WITH THE ANALOG MEMORY AND LOGIC SYSTEM INTRODUCTION The analysis of system response ch2rracteristics, purpose analog computer utilizing a general equipped with the Analog Memoryand Iogic System by EAI, is described in this paper. The response of a servo loop to both fixed and random inputs is considered. Figure 1 shows this system which receives an input signal via a band-pass filter. THE ANALOG MEMORY AND LOGIC SYSTEM The Analog Memory and Logic System includesthe flexible control and timing of individual integrator modes and time constants which the analog computer requires in order to accomplish a complete system analysis. Sophisticated programming of integrator and analog memory tmit operating modes is possible through the use of logic gates and high-speed voltage comparators. \ -- very fast o compressed ligt_tqS4]9-gpe3tiog time-scale setting for continuous solution for obtaining more significant averages for random inputs over a given time sPan HIGH-SPEED PLOTTING TECHNIQUE The higher-speed operating mode provides solutions that, primarily, are to be observed. Since electro-mechanical recorders operate too slowly to follow such high-speed solutions, it isnecessary to employ a special recording technique for those applicdtions in which a permanent recordof system response during repetitive operation is necessary. A Stroboscopic Plotting Technique utilizing Analog Memory units is used to accomplish such plotting. This technique involves sampling of the variable at a specific time during each solution, holdingthis value, and comparing it to a reference. DISTRIBUTION ANALYSIS SYSTEM SIMULATION PROBABILITY Standard analog techniques are used to program the model of the system. The mode control and timing provisions of the Analog Memory and Logic System permit three modes of operation without re-programming: In many applications it is necessary to plot the cumulative probability distribution curve for sysThis curve represents the probatem variables. bility (or fraction of time) during which the variable exceeds a certainvalue, plottedagainst that value. o real-time simulation -- relatively slow speed s y s tem response s olut i o n fo r re c o rd i n g changes on X-Y Plotting board . -- fastertimefor observsolution scale setting, higher speed a cathode on response in system ing changes display tube ray A Probability Distribution Analysis technique utilizing Gaussian noise input iS used to accomplish this plot. For complete details on this applieation, please write for Hybrid Computing Techniques: 1.3.4.h' Bulletin No. ALHC 6397-1. Fi GU R EI. *Trodc Mork P r i n t e d i n U.S.A. 4 6 4 @ El ec tr oni c As s o c i o i e s , l n c -, 1 9 6 4 Al l R i ghts R es e rv e d Bul l c ti n N o. AL H C 6 4 0 2 4