PULSE INPUT SEQUENCES FOR RESIDUAL VIBRATION REDUCTION

Preshaping of the input is a well known technique to reduce the vibrat ion in a flexible structure. In this paper, inputs in the form of puls e sequences that are able to reduce the residual vibration in overhead crane are presented. If the exact natural frequency and damping ratio of the system are known, then the residual vibration can be eliminate d completely. However, additional constraints can be imposed to incorp orate some robustness in the system to variations in the natural frequ ency and damping ratio for practical implementation. Simulation result s and experimental tests show that the inputs developed here are effec tive in moving the system with no or little residual vibration. In add ition, the suggested inputs with robustness incorporated show marked i nsensitivity to errors in natural frequency and damping ratio estimate s. (C) 1998 Academic Press Limited.