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Pneumatic cylinder trajectory tracking control using a feedforward multilayer neural network

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2 Author(s)
Gross, D.C. ; NAIC DXSA, Wright-Patterson AFB, OH, USA ; Rattan, K.S.

Pneumatic cylinders are used in many industrial applications to position loads using a rectilinear motion. Currently, pneumatic cylinders are limited to a narrow range of applications because their motion trajectory is difficult to control. Conventional linear control methods can not compensate for both the nonlinear flow of compressed air and the internal friction present in the cylinders. Multilayer neural networks (MNNs) are nonlinear mappings which can be used to compensate for the nonlinear nature of these dynamic systems. A model of a pneumatic cylinder was developed to provide training data for a MNN. The MNN was designed to cancel the cylinder dynamics and was implemented as a feedforward controller in conjunction with a PID feedback controller. The MNN was trained over a range of constant velocity trajectories. The resultant controller allows the model to track the constant velocity training trajectories as well as trajectories for which the MNN was not trained

Published in:

Aerospace and Electronics Conference, 1997. NAECON 1997., Proceedings of the IEEE 1997 National  (Volume:2 )

Date of Conference:

14-18 Jul 1997