moving constraint

moving constraint

[′müv·iŋ kən′strānt]
(mechanics)
A constraint that changes with time, as in the case of a system on a moving platform.
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References in periodicals archive ?
She explains that custom manufacturers and job shops -- who don't make the same things over and over again can struggle with a mix changes, customer changes, and a constantly moving constraint -- have difficulty shortening lead-times and meeting due dates because of the nature of their work.
Presenters can expect a Cirque show, but due to moving constraints, "There will be no trapeze," says Clear Channel's Scott Zeiger.