This can be a significant dead time in systems using inexpensive and slower microprocessors. Its effect on the system being controlled, or as a delay in the measurement of the output. Another, perhaps unexpected, source of dead time is the computation time required for digital control computer to calculate the control algorithm. The delay often results from the physical separation of the components and typically occurs as a delay between a change in the actuator signal and So the transfer function for a dead-time process is «”>.ĭead time may be described as a “pure” time delay, in which no response at all occurs for a time T, as opposed to the time lag associated with the time constant of a response, for which 82(t) = (1 – e-t/T)81 (t). Some systems have an unavoidable time delay in the interaction between components. If no heat energy is lost, then 82(t) = 81(t – T).įrom the shifting property of the Laplace transform, The time T is the dead time. Let 8,(I) denote the incoming fluid temperature and 82(t) the temperature ofthe fluid leaving the conduit. If the fluid velocity IJ is constant and the conduit length is L, it takes a time T = L[» for the fluid to move from one end to the other. It occurs, for example, when a fluid flows through a conduit. Dead time, also called transport delay, is a time delay between an action and its effect.
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