In order to realize this, a feedforward control
Bhandari, "Block-oriented feedforward control
," Chemical Engineering Research and Design, vol.
Because feedforward control
responds to the stressor rather than the state perturbed by the stressor, this type of control can be preemptive, capable of responding more quickly to the increased level of the stressor.
has been defined as "anticipatory control in which preventative action is taken before the difference between planned and actual performance occurs" (Ishikawa and Smith 1972, 166).
Chaudhari, Sturges and Sandu challenge this practice by exploring the impact of ordering policies that use both proportional-integral-derivative feedback control and feedforward control
produces predictive motor commands that reflect previous reaching history, and feedback control is the ability to make adjustments during the movement based on error detection by the visual and proprioceptive sensory systems [5-7].
A qualitative discussion of mechanisms of feedback and feedforward control
The synthesis procedure, which employs integral feedforward control
, is presented in section III.
Simple feedforward control
only works adequately when the system can be accurately represented with an instantaneous algebraic equation.
systems allow for the use of unskilled labor by ensuring quality and standardization through processes rather than individuals (Fowler, 1999; Morgan, 1992), while feedback control systems leave quality in the hands of workers so that products can be tailored to meet customer needs (Filley and Aldag, 1980).
Many plants already have the assets to do this and some PID blocks have a bias input, making implementing feedforward control
as simple as an adding to a feedback loop.
1997) applied this variance analysis method to investigate the need for feedforward control
on data sets provided by Shell, USA.