Hi there, I set up a simulation using direct velocity feedback to reduce vibrations of a mechanical 2-dof system (2 masses interconnected by a spring and the second mass is connectet to the fixed ground). The result looks fine: vibration reduction works. But as I had a closer look to the sensitivity function "S" I found that "S" never gets bigger then "1" - how can this be explained with the "waterbed effect" from the bode integrals? Refering to the "waterbed effect" I expected the sensitivity function being smaller "1" in the vicinity of the resonance peeks and bigger than "1" in other areas - but it never goes beyond "1"!? Why? Thanks. Bye, Marcus
- posted
18 years ago