# Wisawanart

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1. ## How to measure the angle of rotation using TH/spring or TH/Rbody?

Hi Simon, Thank for your reply, I just want to track the angle varied over the time. To plot it as an x-axis in the bending graph. best regards, wisawanart
2. ## angle of rotation How to measure the angle of rotation using TH/spring or TH/Rbody?

Dear Altair support team, Recently, I have carried out a bending simulation on the sturctural members jointed using a spring element as a weld as shown in the first Figure. The simulation works very well, I can obtain the data that I measure like force and moment, except for the angle of rotation around x axis. Previously, I have been trying to use Spring and Rigid elements to track the angle of rotation since the HyperWorks Help indicates that we can obtain the angle of rotation using those element tyupes (Help is captured and shown in the second Figure). But they didnt provide me a resonable result as expected. If I need to track the angle of rotation θ showed in the first Figure, what is the approach that I can use in this situation? If you need futher information please let me know. Best regards Wisawanart
3. ## What is the Expression for cutting the T01 into considered range

Dear Altair support team, I am studying in crash box optimation, I set up the model as following figure, this model is deformed until reach incompressible condition (To observe total crushing performance), as a result the force goes up considerably after 120mm. However, I need to consider the data between 0 - 120 mm (78% of total displacement), but I can not find the Expression for cut the data in HyperStudy. According to the figure below, that show you the Force and Displacement collected from T01 file, how can I trim the data range from 0 - 120mm using some Functions. Below this, there are output responses that already create but need to select the appropiate range first. If you need further information please do not hersitate to let me know. Thank you for your help Best regards, Nut
4. ## Input variables for Shape optimization

Dear. Mr. Rahul R. I will share you the model, the model is symmetry. As you showed me the similar question previously, -1 mean they apply in the reverse direction but I do not prefer such kind of condition. Can I fill up the Lower bound as 0?
5. ## Input variables for Shape optimization

Dear Altair support team, Mr. Rahul R., I am working on optimization the vehicle crash box, I have some question about Hyperstudy / Hypermorph coupling for shape optimization. As first figure below, I created 2 Shapes (yellow and green) by translating the handles in -X,+X direction to increase the taper angle. In HyperStudy, I defined the model type as HyperMesh, while I am importing input variables from HyperMesh, they ask me to identify the lower and upper bound once (as second figure below). In this study, I would like to have the design variables including crash box thickness, shape1 and shape 2. Question 1. I seperated the shape into 2 because I have no idear to handle with them, can there cause any problem further? 2. If I want to keep the handle distance (+10,-10 in x direction) which is defined in the HyperMesh, Should I set up the input variables as following? Variable 1 (dv_1) Lower= 0, Nominal = 0, Upper = 10 Variable 2 (dv_2) Lower= 0, Nominal = 0, Upper = -10 Are there correct? Thank you for your calification. Best regards, Wisawanart
6. ## Create 3D surface plot from 2D raw data

Dear. Altair support team, Can I plot the 3D contour from the raw data line impored from Hypergraph2D as the figure below. For the value between the data lines, they may be interpolated simply. How to set up such kind of graph using Hypergraph 3D? thank you for your answer best regards
7. ## Can I define Hypermorph's handles as design variables

Dear Altair support team, I am setting up the analysis of the crashbox for optimization. I have some questions regarding the Hyperstudy, 1. As figure below, can I set the position of those handles (red points) as a design variables because I need to find out the optimal taper angle. When I looked into the .tpl file, there cannot be adjusted them while shell thickness can be specified the lower upper bound directly. If impossible, could you suggest me the similar ways to carry out this task. 2. When I Evaluate Tasks for both nominal run and optimization. I think, the software is trying to solve the results but unfortunately when I look into the CPU load, it just 9% as same as the memory, completely different from usual situations. Normally, I define number of CPU cores as 24 (-nt 24) in RADIOSS. There have something wrong? or how I can define the core number in Hyperstudy? it is very slow now even a small problem. thank you for your help, best regards Wisawanart
8. ## Bumper model set up (Interface error)

Dear Altair support team According to the Collision Detection, I've just meshed once and rechecked the initial penetration searched by Edge, I found there have several Edge penetrations in this model as the figure below. In this model, the penetration due to the thickness was removed, normally, I did not concern about edge penetration. Can I ask some questions? 1. Why the edge penetration occurs? 2. Can those ones cause further issues? Thank you Wisawanart
9. ## Bumper model set up (Interface error)

Hi Mr. Prakash I have sent you the model file via Filetransfer. Thank you Best regards Wisawanart
10. ## Bumper model set up (Interface error)

Dear Altair support team Let me explain regarding my FE model, I usually set up such kind of bumper model for crash analysis, unfortunately, this time I faced with the unfamiliar issues. As usual, I used the Tied_contact (Type2) to represent the spot welding by specifying the contact pairs as [M] cotact_surface and [S] GRNODE manually. You can see the spot weld locations as the figure below (green ball represent the spot weld). For the self-contact, I used the Type19 and defined the contact pairs as SURF_EXT_PART for both. Before running, I already used the Model checker but no error was found. I will briefly show those kinds of errors, ERROR ID : 558 ** ERROR IN INTERFACE DEFINITON (MASTER SURFACE) <<< This error came from Self-contact when I remove self-contact, this issue disappeared. ERROR ID : 611 ** ERROR IN INITIAL PENETRATION IN INTERFACE <<< This error came from Self-contact when I remove self-contact, this issue disappeared. I already fixed the initial penetration of model WARNING ID : 343 ** WARNING : INITIAL PENETRATIONS IN INTERFACE WARNING ID : 499 ** WARNING : INITIAL PENETRATIONS IN INTERFACE ERROR ID : 22 ** ERROR IN SHELL DEFINITION DESCRIPTION : SHELL ID=222890 HAS 2 IDENTICAL NODES THAT ARE NOT 3 & 4 ERROR ID : 35 ** ERROR IN TRIANGULAR SHELL GEOMETRY For those issues, I tried to fix it first but it doesn't work, I can share you this model for further details and the error format is attached to this post Best regard Nut Error_Format.txt
11. ## Create the response from fuction

Hi I am a new user in HyperStudy, I faced with the error in creating process of output response, the f(x) is shown as the figure below. Previously, I tried to fill in ((dv_2)−(5*(dv_1)^2)/(4*3.142^2)+5*dv_1/3.142−6)^2+10*(1−1/8*3.142)*cos⁡(dv_1)+10; (when X1=dv_1, X2=dv_2) but it is not working. Please suggest me how to put such kind of equation in Hyperstudy. Best regards
12. ## Creating data surface from f(x) and fitting

Hi I am a new Hyperstudy user, I would like to perform the function fitting form DOE creating by mathematic function. which model that I should do first and if you have the related tutorials, please suggest me further. Best regards,
13. ## ERROR : RUN NAME IS NOT DEFINED

Hi Support Team I have tried to run the simulation model including the residual stress (.sta). I set the stress into the model using Results Initializer from the Crash interface, unfortunately, I face MASSAGE ID : 194 ERROR : RUN NAME IS NOT DEFINED. Before the residual stresses are taken into account, the solver operates properly. Even though, I have already filled up all of blank which is related to "RUN NAME" but still fail. How to fix this issue? Best regards. Wisawanart
14. ## How to set interface type 2 with no Warning ?

Hi As the previous figure, I used slave node and master surface (Node to Surface) for all of the contact pairs. Best regards
15. ## How to set interface type 2 with no Warning ?

Hi I've been trying to set up the drop test tower simulation comprising of 8 components. All of the components are SOLID, I have faced with the difficulty to connect those components appropriately then, I decided to use the interface type 2 as the connectors. As a result, during running RADIOSS, it showed up the 10 warnings as below. 1. How to set this kind of interface with the suitable connection (Which parameter ?), just connect them instead of being the equivalent node. 2. I defined the BC as Solid symmetry and based fix, both of them cause the incompatible kinematic condition, how to solve? WARNING ID: 194 ** WARNING IN HIERARCHY REFERENCE DESCRIPTION : -- NODE GROUP ID: 12 -- BC_Gravity TITLE: PART REFERENCE TO UNEXISTING ID=80 .. BOUNDARY CONDITIONS .. INITIAL VELOCITIES .. DOMAIN DECOMPOSITION .. ELEMENT GROUPS .. INTERFACES .. INTERFACE BUFFER INITIALIZATION WARNING ID : 1079 ** WARNING : CHECK TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE .. RIGID BODIES .. RETURNS TO DOMAIN DECOMPOSITION FOR OPTIMIZATION .. DOMAIN DECOMPOSITION .. ELEMENT GROUPS .. INTERFACES .. INTERFACE BUFFER INITIALIZATION WARNING ID : 1079 ** WARNING : CHECK TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE WARNING ID : 1157 ** WARNING : TIED INTERFACE .. RIGID BODIES .. ELEMENT BUFFER INITIALIZATION WARNING ID : 312 ** INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL DESCRIPTION : 44 INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL .. GEOMETRY PLOT FILE .. PARALLEL RESTART FILES GENERATION TERMINATION WITH WARNING ------------------ 0 ERROR(S) 11 WARNING(S) PLEASE CHECK LISTING FILE FOR FURTHER DETAILS
16. ## Proper set for the lumped mass

Hello, I have been confusing about the lumped mass setting on crash analysis, which way is the best for representing the entire weight of the vehicle. For my questtions, 1. What should I set for the ICOG card ? normally, I tried with 1 or 3 but I didn't know the exactly definition yet. 2. What is the most suitable cases to set the number of node for RBE? I should select only the nodes at the edge or more ? (the green one ,as a figure below) 3. Generally, I define the inertia mass in RBE2 using card edit directly, but it also has ADMAS manager which will add the mass into the node instead. What is the best way to deal with it? Best regard
17. ## Create the SPR_BEAM from RBODY

Hello, Is it possible to create the Spr_Beam element from 1D > RBODY (RBE2 or RBE3)? and then, assign only the Prop/Type13(Spr_Beam) into this component instead. For this method, the Tied contact (Type2) is not necessary because, the node group are already defined. If such kind of approach can not be used, what is the easiest way to define the spr_beam. Thank you for your answers
18. ## Residual stress mapping

Hi I have a concept that I will manufacture the crashbox by using stamping simulation (Hyperform) and then I may get the residual stress results. For my crashbox, how can I map the residual stress into my model during preprocessing. (How many ways that can be used ? ) If you have some tutorials about this kind of problem please share me and also I need your valuable suggestion. Best regards Nut
19. ## Reaction force on cross section

Hi I defined the neccesary card for the cross section but as i said, i got the worst result as previous post. The picture below shown the area of cross section on the shell surface and also the card details.
20. ## Reaction force on cross section

Hi Yesterday, I have tried to determine the reaction force of the beam by applying the impact load (Drop test). I defined the cross sections not only on the beam surface (shell element) but also on the impactor (solid element). After solving, I found that , the cross section on solid element shown the reaction force perfectly but for the shell element, it shown the worst result (oscillation) and magnitude, These are shown as picture below, How can I determine the normal reaction force on the shell element by using cross section. Thank you for your kindness Best regards Nut
21. ## Element Duplication (Overlapped)

Hi George P Johnson I have another question also ,yesterday I have tried to determine the reaction force of the beam by applying the impact load (Drop test). I defined the cross sections not only on the beam surface (shell element) but also on the impactor (solid element). After solving, I found that , the cross section on solid element shown the reaction force perfectly but for the shell element, it shown the worst result (oscillation) and magnitude, These are shown as picture below, How can I determine the normal reaction force on the shell element by using cross section. Thank you for your kindness Best regards Nut
22. ## Element Duplication (Overlapped)

Hello George Thank you for your method to solve my problem sincerely Nut
23. ## Element Duplication (Overlapped)

hello I faced with the problem while I organized from component 1 into component 2 , I duplicated elements in component 1, I think, It will be easier when I want to edit this element later. After that, I found out that many elements is added at the same location (Node), that meant, in displayed, we see 1 element but actually, it is overlapped. How can I fix the problem instead of delete and create it again. Thank you for your answer Best regards Nut
24. ## Error in Geom non-linear(implicit Static) (Error 4001, 556)

Hi Mr. Prakash Pagadala Thank you for your kindness. As I am out of office, I will let you know tommorow. Sorry for inconvenience. Best regards Wisawanart
25. ## Error in Geom non-linear(implicit Static) (Error 4001, 556)

Hi Mr. Prakash Pagadala Firstly, thank you for your answer and also sorry for my English comprehension. From previous post, I intend to mean, If some nodes are both slave and master, this condition will be incompatible for RADIOSS right? Best regards Nut
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