Motion Synchronization Of Multicylinder Electrohydraulic Lift Systems Sun by Sun, Hong instant download after payment.

In this dissertation, motion synchronization of multi-cylinder electro-hydraulic
(EH) lift systems is investigated. Among the different methods of synchronizing the
displacement of multiple cylinders in a hydraulic lift system with unknown but bounded
load, EH control presents a set of attractive trade-offs. A general model for an ncylinder
EH lift is developed that includes the vertical displacement, pitch and row
motion of the load. It can be seen that without external synchronization control, the lift
is an unstable system where the difference in cylinder displacements will increase under
unbalanced load, and will result in significant pitch and row motion that will topple the
load. Two prototype EN lift systems, a two-post and a four-post lift, are constructed to
evaluate different motion synchronization control strategies. Linear Quadratic Regulator
(LQR) and Cross-Coupled Controller (CCC) approaches are applied using the linearlized
lift model. Experimental results show noticeable improvement over existing mechanical
constraint solution.