Summary
The most serious errors in electronicd-c analog computers for differential equations arise from drifts due to unbalances in the amplifiers. We will describe a certain method of reducing these errors: partial drift compensation. Here the analog computer as a whole is compensated for with regard to certain drifts, i.e. certain drifts in the way they appear in the differential equation. The sources of one drift may be located in several elements of the computer. The number of points where the compensation has to be applied is usually much smaller than the number of sources. Thus the partial compensation is an economic solution of the drift problem if it can be realized. This question is treated in the paper and it is shown that this kind of compensation is well suited for analog computers with time-shared elements. An example is finally given where the number of compensation points is nine, although the number of drift sources is forty-five.
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References
Kamke, E., Differentialgleichungen reeller Funktionen, Leipzig 1930.
Löfgren, L., Elektronisk analogi för beräkning av riktningscosinerna mellan tvà inbördes roterande koordinatsystem. FOA 3-report A 137, April 1952).
Löfgren, L., An electronic analogue instrument for performing several simultaneous multiplications and divisions. FOA 3-report A 131, February 1952 *).
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Löfgren, L.E. Partial drift compensation in electronic d-c analog computers for differential equations. Appl. Sci. Res. 4, 109–123 (1955). https://doi.org/10.1007/BF02316475
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DOI: https://doi.org/10.1007/BF02316475