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|Title:||Electro-hydraulic proportional control of twin-cylinder hydraulic elevators|
|Source:||Li, K., Mannan, M.A., Xu, M., Xiao, Z. (2001-04). Electro-hydraulic proportional control of twin-cylinder hydraulic elevators. Control Engineering Practice 9 (4) : 367-373. ScholarBank@NUS Repository. https://doi.org/10.1016/S0967-0661(01)00003-X|
|Abstract:||The large size of the cab of an electro-hydraulic elevator necessitates the arrangement of two cylinders located symmetrically on both sides of the cab. This paper reports the design of an electro-hydraulic system which consists of three flow-control proportional valves. Speed regulation of the cab and synchronization control of the two cylinders arc also presented. A pseudo-derivative feedback (PDF) controller is applied to obtain a velocity pattern of the cab that proves to be close to the given one. The non-synchronous error of the two cylinders is kept within ± 2 mm with a constrained step proportional-derivative (PD) controller. A solenoid-actuated non-return valve, i.e. a hydraulic lock, is also developed to prevent cab sinking and allow easy inverse-fluid flow. © 2001 Published by Elsevier Science Ltd.|
|Source Title:||Control Engineering Practice|
|Appears in Collections:||Staff Publications|
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