TJ51 :
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2009
Authors:
[Author], [Supervisor]
Abstarct: Hydraulic systems have been widely used in industrial motion applications, such as active suspension control and construction machines, because of their small size-to-power ratios and their ability to provide large force and torque. Advanced control methods are necessary for high-performance hydraulic motion control, Motion synchronization has been an important research area in the manufacturing industry,driven by the need to generate precise geometric curves with multi-axis machines and robotic arms. However, open-loop flow dividers and mechanical lixnkages are not adequate to provide high-precision motion synchronization in the presence of load variation, nonlinear characteristics in system dynamics, variability in hydraulic components, and the compressibility of the circulating fluid. These issues increase the difficulty of achieving high-performance motion synchronization, and present safety concerns when positioning inaccuracies occur in applications with heavy loads and/or large workspace requirements. In this research, an integrated fuzzy controller is proposed to achieve a synchronous positioning objective for a dual-cylinder electro-hydraulic lifting system with unbalanced loadings, system uncertainties, and disturbances. The control system consists of one-fuzzy coordination controller for both cylinders and an individual cylinder controller, comprised of a feed-forward controller,and a fuzzy tracking controller, for each of the hydraulic cylinders. In the integrated fuzzy controller design, the fuzzy coordination controller is responsible for dispatching motion synchronization commands to the individual cylinder controllers. Each cylinder controller then adaptively enforces the position tracking to its controlled actuator. The experimental results show that the proposed integrated fuzzy controller design can effectively achieve the objective of position synchronization in the dual-cylinder electro-hydraulic system.
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