GA-optimized feedforward-PID tracking control for a rugged electrohydraulic system design

BK Sarkar, P Mandal, R Saha, S Mookherjee, D Sanyal - ISA transactions, 2013 - Elsevier
ISA transactions, 2013Elsevier
Rugged electrohydraulic systems are preferred for remote and harsh applications. Despite
the low bandwidth, large deadband and flow nonlinearities in proportional valves valve and
highly nonlinear friction in industry-grade cylinders that comprise rugged systems, their
maintenance are much easier than very sophisticated and delicate servocontrol and
servocylinder systems. With the target of making the easily maintainable system to perform
comparably to a servosystem, a feedforward control has been designed here for …
Abstract
Rugged electrohydraulic systems are preferred for remote and harsh applications. Despite the low bandwidth, large deadband and flow nonlinearities in proportional valves valve and highly nonlinear friction in industry-grade cylinders that comprise rugged systems, their maintenance are much easier than very sophisticated and delicate servocontrol and servocylinder systems. With the target of making the easily maintainable system to perform comparably to a servosystem, a feedforward control has been designed here for compensating the nonlinearities. A PID feedback of the piston displacement has been employed in tandem for absorbing the unmodeled effects. All the controller parameters have been optimized by a real-coded genetic algorithm. The agreement between the achieved real-time responses for step and sinusoidal demands with those achieved by modern servosystems clearly establishes the acceptability of the controller design.
Elsevier
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