# Vachan

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1. ## How to simulate a free end boundary condition for a rod while the other end has a forcing?

Hi , I am doing a transient direct analysis of a 1D rod in optistruct . On one end of the rod there is an axial sinusoidal displacement input. The other end is free. I want to look at the transient solution to this problem. i.e I want to see the travel of the first wave of deformation from the forced end to the free end. How can I set up this kind of boundary condition? regards, Vachan
2. ## Extracting Nodal coordinates of deformed shape

Thank you! That was so easy! Really helpful! regards, Vachan
3. ## Extracting Nodal coordinates of deformed shape

Hi all, I have a deformed surface (a mode shape) obtained by Normal modes analysis. I want to extract the coordinates of all the nodes that lie along a line on the surface of this deformed shape. In HyperView , I have used the section view (at y=273 mm, see below) to see the cross section. By using right click --> quick query and clicking on the nodes, I can see the coordinates of each node (as shown in the figure that I attached below) along the line on this deformed shape. Is there a way to get a list of the coordinates of all the nodes along this line? My aim is to plot this shape later to compare with another result using MATLAB. regards, Vachan
4. ## What does the .pch file contain in the case of a modal analysis?

Hi, I am sorry but an eigen vector is a single column for a given eigen value right? So how do i interpret these three columns (listed for every frequency) inside the .pch file? regards, Vachan
5. ## Steady state forced response using modal superposition technique

Oh OK. I will go through it. Thank you so much! regards, Vachan
6. ## Steady state forced response using modal superposition technique

Hi, I have done the modal analysis of a simply supported plate. Now I need to find the forced response of the SS plate for a point forcing. The transverse (perpendicular to the plate) point load is harmonic (say F cos(wt) ,where F is magnitude and w is frequency in rad/s). I need a steady state response. i.e displacement field at a given time instant. Is it possible to use the mode set from the modal analysis and get the solution as a modal superposition of those modeshapes ? If yes please help me out with the steps roughly. regards, Vachan
7. ## What does the .pch file contain in the case of a modal analysis?

Ok Thank you so much! regards, Vachan
8. ## What does the .pch file contain in the case of a modal analysis?

What are the three columns in the punch file? Are they x,y,z coordinates? regards, Vachan
9. ## What does the .pch file contain in the case of a modal analysis?

Hi @Prakash Pagadala, Did you get the files ? regards, Vachan
10. ## What does the .pch file contain in the case of a modal analysis?

Hi, I did a modal analysis of a 2d plate. I generated a .pch file. Now if I open this file in notepad, I see three columns of data for every mode. Are these columns the x,y,z coordinates of the corresponding modeshape? I am asking this because I would like to plot the modeshape in MATLAB. I tried plotting it but I did not get a proper shape. At first I thought that every row corresponds to the coordinates of a node in the mesh. But later I observed that for every mode, the number of rows in the notepad file is different. This is what made me doubt about it. So what exactly does a pch file contain in the case of a modal analysis? It would be of great help if you can suggest me any other way to plot modeshapes in MATLAB using some result file from my analysis in Hyperworks. regards, Vachan
11. ## How can I change the phase of a modeshape result?

Hi, @Mario , that was a great idea!! It worked! thank you so much! This simple solution never occurred to me! @Premanand Suryavanshi - Thank you so much for offering help! regards, Vachan
12. ## How can I change the phase of a modeshape result?

Hi, I have done the modal analysis of rectangular plates. Each plate has same length and breadth but has holes at different locations. I want to compare the modeshapes of these plates by overlaying them. When I overlay two h3d files, they appear with a 180 degree phase shift with respect to each other, i.e. the crest of one plate meets the trough of the other plate for every mode. How can I change the phase of one of the plates by 180 degrees? Or is there any other way to correct this? regards, Vachan
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