System Dynamics Modules
Delayed Irreversible (Transitional) Flow
In this module which has component parts and functionality similar
to Delayed Inflow, we are concerned about the flows from
one stock (or level) to another stock (or level). This
module would be used to describe the physical change of
state of a continuously flowing resource or of individual items.
This could occur as the result of some processing action.
Sterman (2000: 464-5) and Coyle (1996: 98-108) caution us that
when building system dynamics models we need to be very
clear exactly the type of delay mechanism operates. In first
order delays, the stock of material in transit are perfectly
mixed at all times, meaning that outputs from DELAY CONTENTS
are in random order with respect to their input. In
higher order delays material is output in the same order
as they are input; the order depends on the number
of process stages involved.
The description of the module is at
The module coded in Powersim Studio is at
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