  # samuel88

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## Everything posted by samuel88

1. @Prakash Pagadala Yes, the units are different. But that's what I need to achieve. Thank you.
2. @tinh @Prakash Pagadala Please, find my attached geometry. I want to implement topography optimization. Minimum area bounding box around my model = m perimeter of the model = p compliance = c f = m + p Objective = minimize f constraint: lower bound = 0.2*c, upper bound = 0.8*c How can I implement this? Note that perimeter and minimum area bounding box are not included among the design responses in hypermesh. Thank you. cantileverforforum10.hm
3. @tinh Thank you. Where should I input these commands?
4. @tinh Thank you. I am using hypermesh GUI. I do not know how to do tcl scripting. Please, what is the equivalent procedure for those codes in hypermesh GUI?
5. @Rahul R @Prakash Pagadala Thank you so much for the reply. That will not solve my problem. I will not be able to accurately construct a minimum bounding box by myself. There is an Algorithm which can do that in Matlab. Please, how can I obtain the coordinates which describe a model in hypermesh. If I get that coordinates, I can use it to draw the model in Matlab and calculate the minimum area bounding box in Matlab. Thank you.
6. @Prakash Pagadala @Rahul R I want to minimize the compliance of my model in hypermesh using topography optimization by adding beads. But I realize that the optimization is converging without bead addition and the compliance did not change. What am I doing wrong?
7. @mahes Thank you so much. Please, how can I obtain the minimum area bounding box for a geometry in hypermesh?
8. A minimum bounding box is a rectangle that encloses a geometry has the smallest area of all enclosing rectangles. Please, how can I obtain the minimum area bounding box for a 2D geometry in hypermesh. I need the area? Thank you.
9. Please, how can I obtain the area and perimeter of a 2D model in Hypermesh? Thank you.
10. @Prakash Pagadala I have 2D model in hypermesh and hyperwork. I need to obtain the perimeter of the geometry and the coordinates which I can use to create the same geometry in MATLAB. Kindly advice me on how to: 1. Obtain the perimeter of a 2D geometry in hyperwork and hypermesh 2. Extract the coordinates that create the 2D geometry in hyperwork and hypermesh. Thank you.
11. I got it. Thank you.
12. I have 2D model in hypermesh and hyperwork. I need to obtain the perimeter of the geometry and the coordinates which I can use to create the same geometry in MATLAB.

Kindly advice me on how to:

1. Obtain the perimeter of a 2D geometry in  hyperwork and hypermesh

2. Extract the coordinates that create the 2D geometry in hyperwork and hypermesh.

Thank you.

13. I have 2D model in hypermesh and hyperwork. I need to obtain the perimeter of the geometry and the coordinates which I can use to create the same geometry in MATLAB. Kindly advice me on how to: 1. Obtain the perimeter of a 2D geometry in hyperwork and hypermesh 2. Extract the coordinates that create the 2D geometry in hyperwork and hypermesh. Thank you.
14. Hello Rahul,

Please can you explain how you put SPCD and SPC into the same load collector.

In addition to fixed boundary condition on one edge, I applied three different displacement boundary conditions, one at each node on my model. When I ran the analysis, I realized that the result is not giving the aggregate effect of all the displacements. Rather, it gives the analysis for each displacement boundary condition as each subcase. I am thinking that if I can place all the enforced displacements in one load collector (spc), then I can use one load step (SPC) for all of them. With that approach, I am thinking I could get the aggregate effects in my analysis. Please, what are you thoughts on how to go about it? Thank you.   15. Hi Prakash, See the figures below: I applied three different displacement boundary conditions, one at each node on my model. When I ran the analysis, I realized that the result is not giving the aggregate effect of all the displacements. Rather, it gives the analysis for each displacement boundary condition as each subcase. Kindly help me check the attached model (hm file) and indicate what I am doing wrong. My goal is to see the overall effect of applying three displacement boundary conditions and a fixed boundary condition, as shown on the model. Thank you. cantileverforforum10.hm
16. @Juergen Kranzeder @Prakash Pagadala @tinh @Rahul Ponginan See the figures below: I applied three different displacement boundary conditions, one at each node on my model. When I ran the analysis, I realized that the result is not giving the aggregate effect of all the displacements. Rather, it gives the analysis for each displacement boundary condition as each subcase. Kindly help me check the attached model (hm file) and indicate what I am doing wrong. My goal is to see the overall effect of applying three displacement boundary conditions and a fixed boundary condition, as shown on the model. Thank you. cantileverforforum10.hm
17. Please, I want to apply displacement boundary condition at some specific locations on my model in hypermesh (Optistruct). The locations are not on the mesh nodes. Please, see the attached picture. I have the coordinates of the locations (x1, y1), (x2, y2), (x3, y3) and (x4, y4) and their enforced displacements (displ_x1, displ_y1), (displ_x2, displ_y2), (displ_x4, displ_y4) and (displ_x4, displ_y4) respectively. How can I create these locations on my model and apply the displacement boundary conditions at these locations. Note that these locations are not among the nodes generated from meshing the model. Thank you.
18. It works. Please, kindly post the link to the tutorial OS-5060 Please, I want to apply displacement boundary condition at some specific locations on my model in hypermesh (Optistruct). Please, see the attached picture. I have the coordinates of the locations (x1, y1), (x2, y2), (x3, y3) and (x4, y4) and their enforced displacements (displ_x1, displ_y1), (displ_x2, displ_y2), (displ_x4, displ_y4) and (displ_x4, displ_y4) respectively. How can I create these locations on my model and apply the displacement boundary conditions at these locations. Note that these locations are not among the nodes generated from meshing the model. Thank you.
19. I applied displacement boundary condition in Hypermesh (Optistruct). But I have this error message: *** ERROR # 186 *** An SPCD component must be constrained by an SPC or SPC1 data. GRID ID = 22 component = 1 LOAD set ID = 3 SPC set ID = 1 subcase ID = 1 I attached my model. I have read discussion on the forum but I don't understand what they are saying. Please can someone tell me how to do it correctly? I will also appreciate a video tutorial or a sequence of screenshot on how to apply displacement boundary condition in Optistruct (Hypermesh). Thank you. cantileverforforum10.hm
20. I am having similar issue and I have not been able to resolve it. Please, find my attached hm file. I want to apply x displacement of 1 and y displacement of 1 to the left bottom node of the model. I got this error: *** ERROR # 186 *** An SPCD component must be constrained by an SPC or SPC1 data. GRID ID = 22 component = 1 LOAD set ID = 3 SPC set ID = 1 subcase ID = 1 @Rahul Ponginan Maybe I don't understand this: Note that the degree of freedom referenced on SPCD must also be referenced on a SPC or SPC1 bulk data entry and selected by the SPC subcase information command, So you need to create a SPC load collector and constrain the DOFs specified in SPCD in this SPC collector, Then Reference SPCD card in LOAD subcase, and SPCs in SPC subcase. See comment 1 in the help document - Altair OptiStruct > Reference Guide > Input Data > Bulk Data Section: SPCD The degree-of-freedom (G and C) referenced on this entry must also be referenced on an SPC or SPC1 bulk data entry and selected by the SPC subcase information command in the same subcase. Also, where can I access Altair Opstistruct Reference guide? Thank you. cantileverforforum10.hm
21. This is the new error when I attempted to use enforced displacement: *** ERROR # 186 *** An SPCD component must be constrained by an SPC or SPC1 data. GRID ID = 33 component = 3 LOAD set ID = 7 SPC set ID = 1 subcase ID = 1
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