|
Any structure that deforms under some loading can be regarded as flexible structure. Flexible structures are distributed parameter systems. The distributed nature of a structure implies that vibration at one point is dynamically related to the vibration at other locations. This means that a controller that minimizes structural vibration at a specific location does not necessarily minimize vibration at other locations effectively. On the contrary, it could result in an increase in vibration levels (or higher noise radiation levels) at some other regions. Therefore, it is desirable to design a controller that can minimize vibration in a spatial sense, taking into account every point along the structure, i.e., by using a spatial control approach.
This research is aimed to develop an optimal control system for flexible structure to attenuate structural vibration globally and noise radiation indirectly. The work involved the design and implementation of the Spatial Control strategy for attenuating broadband disturbance of a two-dimensional structure: a simply supported plate. Surface-bonded piezoceramic transducers were used as the actuators and sensor. Spatial controller was designed to minimize the spatial H2 norm of the transfer function from the disturbance signal to the vibration at every point over the plate. This approach ensures the vibration contributed by all the in-bandwidth vibration modes is minimized, and hence is capable of minimizing vibration throughout the entire plate.
For more information see
here
|
|
