Eigenfrequencies without any restriction
Eigenfrequencies without any restriction
(OP)
Has some sense extract the eigenfrequencies of a structure, or mechanical part, without any restriction in displacements?. If so, which is the reason?.
I do this question, because i´ve seen do this in a very, very important analysis of a mechanical component in a very, very important company in its field, and i don´t understand it.
Thanks in advance.
I do this question, because i´ve seen do this in a very, very important analysis of a mechanical component in a very, very important company in its field, and i don´t understand it.
Thanks in advance.






RE: Eigenfrequencies without any restriction
RE: Eigenfrequencies without any restriction
RE: Eigenfrequencies without any restriction
Eigenvalue is only function of stiffness for stability analysis ?
Eigenvalue is only function of stiffness and Mass for dynamic analysis ?
RE: Eigenfrequencies without any restriction
If I remember correctly, for the eigenprobem formulation i am used to, the eigenvector values are amplitude generally scaled with a generalized coordinate and eigenvalue correspond to
1) square of the mode frequency in dyanmic analysis
2) load scale factor in stability analysis.
RE: Eigenfrequencies without any restriction
RE: Eigenfrequencies without any restriction
As you say it identifies the resonant frequencies of the test part unconstrained. This is accurate for items in space, and fairly accurate for those where their constraints are very soft compared with the stiffness of the part, such as an engine on its mounts, or the car body on its suspension.
Cheers
Greg Locock
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RE: Eigenfrequencies without any restriction