DESIGN OF A CASCADE CONTROLLER FOR A FLEXIBLE SPRAY BOOM

Longitudinal accelerations and yawing angular accelerations of a tract or induce horizontal flexible spray boom deformations which cannot be reduced sufficiently by simple structural adaptations. An electro-hydr aulic control system has therefore been developed in order to attenuat e the negative effect of longitudinal tractor accelerations on a spray boom. The linear quadratic Gaussian theory with loop transfer recover y has been used to design the compensator. Four different variants of the compensator are implemented in an experimental set-up to test the performance and the robustness of the feedback system and to investiga te the applicability of the electro-hydraulic devices in active vibrat ion control. (C) 1996 Academic Press Limited