| Popis: |
This interim report presents the broad band control theory aspects of a programme whose objective is to control the dynamics of a large, lightweight marine machinery raft supported on an array of electromagnetic actuators. The report shows how it is possible to achieve, simultaneously, the normally conflicting requirements of accurate alignment of the raft under sea-way or manoeuvring motions, of the elimination of mount resonances, of stiffening long wavelength bending resonances without incurring a radiation hazard, of decoupling shorter wavelength bending resonances and of greatly reducing any residual force transmission through the mounts at higher frequencies. Simulations of the control theory applied to a simple model raft, show that very large performance improvements are possible. These findings go some way to giving the assurance that large, lightweight machinery rafts could be used in future installations without having to make any compromises in overall performance. This, in turn points to a new way for reducing overall costs. |
