Mahmood,

I still think a mechanical damping or something as suggested by Rob's post would be better, because I really don't think you can find an ACTUATOR that works fast enough to compensate for that sort of high frequency disturbance.

I can envision the sensors involved, and the sort of control system that can be employed, but I think it is far from simple. I cannot see how it can be effective without some feedforward component. Even if you make the calculations from position and acceleration (I don't know how you mean to mount this), you'll have problem with the mechanical aspects: as fast as you can make the electronics, the mechanical part will always be too slow to be practically effective. Furthermore, the mechanical system will be at least a 1st order system, and its control will involve a lot of dynamics, which is then no longer "simple". Developing an actuator suitable for the job will be a project in itself (I had to do that for my final year project :-D )

Maybe if you explain in some more detail what and how you mean to do it, we could give you better feedback. Also my knowledge of current technology may be outdated, so do tell me how you plan to overcome the limitations I think you will face :-)

kundi