For couple of weeks now, I have been trying to measure cutting forces during machining processes. The system which I am currently examining is highly distorted at high frequencies due to its structural dynamics. My set-up consists of force sensor, workpiece holder and workpiece itself - they are screwed all together with M12 screw.
The problem is that I struggle to interpret FRF of the setup correctly. For better understanding, please see attached figure.
What is the physical explaination of the peaks marked in the figure? Does it mean that forces measured at these frequencies are damped?
Thanks in advance for any kind of help.