Friday, 18th May 2001, 1pm
|Title :||The passive and active optimisation of a 2-D space structure|
Dr. David Anthony, Computational Engineering & Design Centre, CEDC
University of Southampton
|Keywords :||2D/3D space structure optimisation, satellite vibration, Genetic Algorithms (GA), Active Vibration Control (AVC), optimised dynamic performance|
There is currently much interest in space structures. One particular area of interest concerns satellite boom arms, which are used to deploy equipment, such as antennae, away from the main body of the satellite. Vibrations emanating from the satellite body, transmitted via the boom arm, can have serious consequences on the performance of such equipment.
Three different design strategies, and their results when applied to a 2-D space structure, are presented. The first strategy (passive optimisation) is the redesign of the structure geometry in order to inherently reduce the vibration transmission. Genetic algorithms (GAs) were used for this, and the basic operation of the GA used for this optimisation problem will also be presented. The second strategy (active optimisation) is the application of feedforward Active Vibration Control (AVC) techniques. In this case the best actuator positions on the structure are sought in order to produce the best possible attenuation. The third strategy is the combination of both passive and active methods.
If time allows the issue of the robustness of the optimal design solutions to small changes in geometry will also be introduced.
There is currently in progress an industry-funded project in the CEDC to design a 3-D space structure which has optimised dynamic performance, using the design strategies detailed above. This project also will carry the design to prototype operational models.
Last updated 15th May 2001. Maintained by M.Molinari.