The main reason is that the composite controller contains a feedforward control
element which general PI controller does not include.
The feedforward control
architecture is shown in Figure 4.
According to such mechanism, a feedforward control
strategy is put forward to mitigate the harmonics on grid side.
Firstly, the AUVs model and wave disturbances model are obtained, and according to disturbances type, an integral unit is introduced to eliminate its ocean current disturbances effect, and a feedforward control
is used to reject wave disturbances.
In , the authors developed a neural network based feedforward control
to compensate for the nonlinearities and uncertainties of a dynamically substructured system consisting of both numerical and physical substructures, where an adaptive law with a new leakage term of NN weights error information was developed to achieve improved convergence.
According to the control structure, active control strategy can be classified into feedback control and feedforward control
. Depending on different actual vibration isolation applications, different vibration control strategies are employed for different scenarios.
Wiener models are also used, for example as a robust nonlinear internal model control of stable Wiener systems , or block-oriented feedforward control
with demonstration to Wiener modelling , or modelling of memristor-based chaotic systems using nonlinear Wiener adaptive filters .
Since the compensation control for the spool valve dead zone is a feedforward control
, it is affected by the current-flow rate characteristics of the linear solenoid valves, variation in the length of the spool valve dead zone, and the like.
A current trend in human-centered robotics is to rely more on feedforward control
and less in feedback effort to achieve higher system efficiency and some level of safety upon collisions with the environment.
Incoherent feedforward control
. Another network motif that can underpin adaptation and threshold response is incoherent feedforward control
(Ma et al.
You can get Traction Control, Stability Control, Launch Control and even Pre-Torque Feedforward Control
that helps stabilize the car through cornering.
Cheng, "Design and implementation of command and friction feedforward control
for CNC motion controllers", in IEE Proc.