SIMULATION: Transactions of The Society for Modeling and Simulation International

Dionne, Paul

doi: 10.1177/003754976500500301pmid: N/A

Stein, Mike

doi: 10.1177/003754976500500302pmid: N/A

Fahidy, T.Z.

doi: 10.1177/003754976500500303pmid: N/A

Stewart, E.L.

doi: 10.1177/003754976500500304pmid: N/A

This paper is concerned with the electrical "noise" on interconnect lines, particularly as applicable to analog equipment. The discussion summarizes the effects of magnetic, electric, and electromagnetic fields. Also considered are common impedances and ground loops in producing electrical interference on analog circuits.The use of lines of low susceptibility is discussed together with the effects obtainable by suitable shielding. Circuits known to have been used are illustrated and their characteristics discussed.Proper system grounding is emphasized as is the fact that interference control is obtained only by the system approach.The paper should serve as a reminder that elec trical interference is minimized through the prin ciples of good wiring practice, separation, and proper attention to the circuit details during design and fabrication.

Kelly, W.A.

doi: 10.1177/003754976500500305pmid: N/A

Benyon, P.R.; Henry, W.J.

doi: 10.1177/003754976500500306pmid: N/A

Mitchell, B.A.

doi: 10.1177/003754976500500307pmid: N/A

This note follows the report last month outlining the technique of using digital memory for accumulating statistical functions for cumulative, probability, and correlation distributions.

Driban, Stanley

doi: 10.1177/003754976500500308pmid: N/A

White, AL

doi: 10.1177/003754976500500309pmid: N/A

Childs, Dara

doi: 10.1177/003754976500500310pmid: N/A

This paper presents a general approach to analog simulation of "water-hammer" type phenomena. In brief, the simulation approach consists of obtaining a general Fourier-series time solution in terms of boundary variables (pressures or flowrates), retaining a finite number of terms in this series solution, and then obtaining the ordinary differential equations to which the terms correspond. One customarily "winces" when contemplating a series solution of any form, particularly when informed that the solu tion is to be subsequently approximated by retaining only a finite number of terms. Although the mathe matical manipulations contained in the paper may appear forbidding, they need be developed but once, and the final differential equations which result are quite simple. Truncation of the Fourier series solu tions happily results only in a truncation of the valid frequency range. Within this valid frequency range there is little or no loss in accuracy. These and other advantageous characteristics of the modal simula tion technique are developed by various analytical and numerical examples.