Modal Analysis

If the modal properties are obtained from ambient excitation, then the mode shapes will not be mass-normalized. what may be the reason ? 

I am finding difficulties to obatain the mode shape from Frequency Response Function (FRF). Let know me the brief procedure in the modal analysis. 

Hi 

i want to analysis a model in anasys workbench with modal analysis.but i Encountered to problem.Bad mesh generation (as you see in the below figure) happened that i don know how to solve it,could anyone help me ?

Regards,Ali 

Any one help me out ,How to estimate stiffness matrix of beam  using modal experimental method?

Hello Experts,

I am trying to do modal analysis on user-defined piezoelectric shell element. My eigen value probelm of free vibration is given in the attachment.

Hello,

I want to do modal analysis of a structure with viscoelastic material. The viscoelastic
material has a complex youngs modulus E= E (1+i*g), where g is the loss factor. In ANSYS, modal analysis ignores all
nonlinearity, so how can I perform modal analysis with viscoelastic material?

OR

How can I perform modal analysis in ANSYS considering hysteretic damping (complex Young’s
modulus  E= E (1+i*g) as input).

Cheers

Hello
I am doing a Modal analysis on a structure made up of 3D-Beam4, Mass21 and Shear panel 28. To be more clear, the structure looks like a cube made up of Beam element on all 12 edges with Mass21 element at all corners of the cube and also with shells (shear panel 28) at all six faces of the cube.

I first constructed the beam structure with keypoints and lines, then i added the point masses and meshed them, then i created the shell element using Modelling-create-area and meshed it. Finally i merged them using "NUMMRG, ALL" in the command field.