Influence stress on natural frequencies
Influence stress on natural frequencies
(OP)
Hi,
for my internship, I'm verifying the static and dynamic behavior of a milling machine. I was wondering what the influence of stress can be on the dynamic behavior. I'd say that a system under stress has higher natural frequencies. In this way, one could stress up a structure to avoid that dangerous natural frequencies occur in the working area of frequencies.
Is stress (prestress the structure) used in real life to place the natural frequencies. If not, why not. If yes, can you give me more information about it.
Has anyone got some tips about this topic,
thanks in advance!
Jeroen
for my internship, I'm verifying the static and dynamic behavior of a milling machine. I was wondering what the influence of stress can be on the dynamic behavior. I'd say that a system under stress has higher natural frequencies. In this way, one could stress up a structure to avoid that dangerous natural frequencies occur in the working area of frequencies.
Is stress (prestress the structure) used in real life to place the natural frequencies. If not, why not. If yes, can you give me more information about it.
Has anyone got some tips about this topic,
thanks in advance!
Jeroen





RE: Influence stress on natural frequencies
Don
Kansas City
RE: Influence stress on natural frequencies
I don’t think there is any substitute for stiffness in a structure. Some machine use mass, but with some types of loading this will not work.
When doing FEA on a machine tool structure, deflection should be the primary concern, and should be verified after assembly.