I am performing a modal analysis in ansys workbenck which has an unsymmetric stiffness matrix. I want to get the complex eigen values of the solution.
- After solving, the results will include complex eigenvalues if damping is applied.
- Right-click on the "Solution" branch, select "Insert" -> "Eigenvalue Results" -> "Complex Eigenvalues".
Mital Patel Thank you for your reply.
But I cannot see any option to insert Eigenvalue Results after right clicking on Solution branch.
- After the solution, go to the Results section.
- Insert a "Total Deformation" result
- Select the mode shape you want to view
- The displayed deformation shape represents the eigenvector for that mode.
- right-click on the solution and choose Export.
- Select "Nodal Displacements" for the mode shapes.
I thinnk it easy to run simulation in APDL
Mital Patel
I followed what you told.
It gives total deformation. But I need the eigenvalues.
And I am new to ansys so I don't have APDL knowledge.
If you know next APDL commad that i can insert to find the eigenvalues please tell.
but when you click on first mode(eg. ) right click on that and export the total deformation in text or excel file. which give you maximum displacement for every node, that's your eigen vectors right ? eigen values are natural frequency.
Ya that are the eigen vectors. But actually I want the real part of the complex eigenvalues.
Himanshu Sharma by using of mathematics you can do that right ? complex number equation.
Perform Modal Analysis in ANSYS: Run the analysis to obtain the eigenvalues and eigenvectors. Export Eigenvalues If the eigenvalues are complex, separate them into their real and imaginary components. Mathematically, this involves ignoring the imaginary part.
A complex eigenvalue Z can be represented as: Z=x+ib
where x is the real part and b is the imaginary part.
Mital Patel I think you missunderstood what I am asking.
I understand that an eigenvalue and eigenvector is in mathematics.
I am not able to obtain the eigen values from the modal analysis.
https://www.youtube.com/watch?v=uJ_T98IhAVc&t=14s&ab_channel=Tech.G
watch this video, in that they are calculating eigen values
still you are not getting my point,
see
Open ansys, Prepare modal anaylysis in ansys, give B.C. like fixed support and all. after that run the simulation.
after getting first 6 mode frequencies, that will show right corner when you click on solution model.
after that select all the frequencies and right click go to total deformation of all frequencies. it will show individual frequencies deformation.
right click on that individual total deformation of frequencies and export to text file. which will give further more node displacement values. that is your eigen vectors. still not understand send me screen shot on my number 9724371807.
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