Active Vibration Control
Active Vibration Control
(OP)
Hi all.
I am relative new in vibration control. I was given a task to reduce (eliminate-ideal case) vibration that happened in grinding machine.
I used acceleration and force sensors with help modal analyzer to measure it.
It seems like a dumb question but how can I get the displacement data from acceleration. If I integrate it directly, the result is "nothing".
Can anyone help me out from it? It would be great then.
sweetday
I am relative new in vibration control. I was given a task to reduce (eliminate-ideal case) vibration that happened in grinding machine.
I used acceleration and force sensors with help modal analyzer to measure it.
It seems like a dumb question but how can I get the displacement data from acceleration. If I integrate it directly, the result is "nothing".
Can anyone help me out from it? It would be great then.
sweetday





RE: Active Vibration Control
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Active Vibration Control
In simulation it is working, but how bout putting it in reality? I have no idea on it.
Any answers that might help?
Thank you.
sweetday
RE: Active Vibration Control
To get the model, I did it in ADAMS and estimated it with the system identification toolbox from Matlab.
To compensate force coming from the process, which generates the vibration, my control strategy is to give force but opposite.
My another silly question is with this additional force fed into the system, would it change the result from system identification toolbox?
Thanks again for any reply. I really appreciate it.
sweetday
RE: Active Vibration Control
Sorry, I haven't used the matlab toolkit. I saw it demonstrated, looks great. One day...
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Active Vibration Control
In practice, there are some associated challenges:
- Can you buy or make an actuator that responds fast enough?
- What 'immovable' object do you attach it to, and how does that object respond to the applied force?
I.e., the system you have to model may be bigger than you thought it was.
Mike Halloran
Pembroke Pines, FL, USA
RE: Active Vibration Control
How long has this problem been going on?
Whas the equipment recently overhauled or relocated?
Are there missing hold-down bolts or other "redundant" parts?
Did somebody changed the operating speed?
A dynamic absorber could help, but you need to find the vibrating frequency.
RE: Active Vibration Control
Mike, Yes, reality is much bitter than simulation :P
Your second challenge is actually my last question.
Svanels, the equipment I think is just fine.
The vibrating frequencies are 70Hz, 120Hz and "others"
sweetday