Disturbance

From International Dictionary of Marine Aids to Navigation
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5-2-200

An undesired variable applied to a system which tends to affect adversely the value of a controlled variable.

Ch5 Fig2.jpg

Figure 2 - Block diagram of automatic control system (5-2-045) incorporating a closed loop (5-2-080)

Reference: ANSI




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM