17-03-2014, 09:28 PM
Abstract
An electro-hydraulic servo force feedback system is
disturbed by a band-limited white noise , it adopted the
conventional PID control algorithm . Simulated its
dynamic characteristics . Constructed the system
simplified model , Designed the GPC Controller and
summarized its design procedure . The simulation
based on the GPC with simplified model has been done
. Compared the two simulation results , The GPC
controller is more suitable when the system is
disturbed by serious noise interference , It had been
validated in project . This research have proved that
design the electro-hydraulic system and choose the
control algorithm can be proceed simultaneously , The
efficiency and accuracy of the electro-hydraulic servo
system design can be improved .
1. Introduction
The electro-hydraulic servo system which deal with
force control is a kind of special system , The force
may be the working force in system , that is the driving
force in driving system , may be the disturbing force
come from any disturbing source . If we adopted
conventional PID control algorithm in practical
application , the dynamic working characteristics
always can not meet the requirement , especially in
restraining disturbing force . Therefore , We need to
look for other control algorithm .
Restraining inner disturbing force is the mainly
work of the system, in literature [1] , utilized force
tracing position synchronization control algorithm .
Restraining the outer disturbing force or the outer
position disturbing is the mainly work of the system ,
In order to keep the working force uninfluenced , in
literature [2] , utilized unchanged structure theory
algorithm . Restraining the extra force in the electrohydraulic
servo loading system , In order to keep the
valve work accurately , in literature [3] , utilized
Neural-network internal feedback control algorithm .
Aimed at a practical electro-hydraulic servo force
feedback system , Introduced the band-limited white
noise interference to the force feedback signal , so the
feedback signal contained false information , utilized
Simscape and Simulink of Matlab , simulated the
system dynamic characteristic based on the
conventional PID control . Constructed the simplified
model according to the input and output data obtained
from system open loop step response simulation ,
Constructed the GPC controller with simplified model
based on Model Predictive Control Toolbox of Matlab
, The simulation base on GPC control has been done.
Compared the two simulation results , The GPC
controller have excellent performance on restraining
noise interference . This conclusion had been validated
in engineering project .