电液比例控制的双缸液压升降机[外文翻译].doc

电液比例控制的双缸液压升降机[外文翻译]

    摘要:一个电液控制的液压升降机的大型机车需要在这个机车的两边安装两个对称的油缸。摘要报道了一种电液系统的设计主要包括三个流体控制比例阀。机车的速度调节和两油缸的同步控制也是呈递的。一个假微分反馈(PDF)控制器以获得一个机车的速度模式来证实和给定的这个接近。两油缸的非同步性的误差范围在±2之内由于有比例控制器来拘泥每一步。一个电磁铁操纵的单向阀,即液压锁,被发明以防止机车下沉并允许反方向流体容易流动。
关键词:液压升降机;速度跟踪;同步化;液压锁

Electro-hydraulic proportional control of twin-cylinder hydraulic elevators
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  are 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 ±2mm 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.
Keywords: Hydraulic elevator; Velocity tracking; Synchronization; Hydraulic lock