feedforward control


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feedforward control

an anticipatory correction in motor behavior. During movement, various brain centers depend on feedback from receptors to control motor behavior. If the actual and intended motor behaviors do not match, an error signal is generated and alterations are made. In some instances the control system anticipates an error and makes the corrective change in advance of the start of movement.
References in periodicals archive ?
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.
Feedforward control 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.
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].
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.
Feedforward control 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.