V. CONCLUSION
In this brief, pneumatic actuators with inexpensive solenoid
valves were chosen for development of a master–slave teleoperation
system. To efficiently control the switching ON/OFF
valves in terms of the force output by the piston, a new
hybrid algorithm was successfully developed and implemented
in experiments. This technique not only took into account the
nonlinear behavior of the mass flow rate, but also the switching
control of the solenoid valves. The results showed that it was
possible to achieve transparent teleoperation without using
more costly proportional servovalves. In experiments, it was
observed that with the 4CH bilateral teleoperation control
architecture employing this hybrid control algorithms, satisfactory
force and position tracking between the master and
the slave was obtained under both free-motion and contactmotion
conditions.
While the proposed hybrid control in this brief is based
on a one-step-ahead prediction of pressures in the pneumatic
chambers, an aspect of future work is to extend the control
law to involve a multi-step prediction in order to improve
the tracking performance. Finally, nonlinear control strategies
for pneumatic actuators with solenoid valves such as those
in [7] and [27] have not been implemented in teleoperation
systems yet. This represents an alternative research path to be
investigated.
REFERENCES
V. CONCLUSIONIn this brief, pneumatic actuators with inexpensive solenoidvalves were chosen for development of a master–slave teleoperationsystem. To efficiently control the switching ON/OFFvalves in terms of the force output by the piston, a newhybrid algorithm was successfully developed and implementedin experiments. This technique not only took into account thenonlinear behavior of the mass flow rate, but also the switchingcontrol of the solenoid valves. The results showed that it waspossible to achieve transparent teleoperation without usingmore costly proportional servovalves. In experiments, it wasobserved that with the 4CH bilateral teleoperation controlarchitecture employing this hybrid control algorithms, satisfactoryforce and position tracking between the master andthe slave was obtained under both free-motion and contactmotionconditions.While the proposed hybrid control in this brief is basedon a one-step-ahead prediction of pressures in the pneumaticchambers, an aspect of future work is to extend the controllaw to involve a multi-step prediction in order to improvethe tracking performance. Finally, nonlinear control strategiesfor pneumatic actuators with solenoid valves such as thosein [7] and [27] have not been implemented in teleoperationsystems yet. This represents an alternative research path to beinvestigated.REFERENCES
การแปล กรุณารอสักครู่..
