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Found 19 results

  1. Hi, I am modeling the engine of our frame as a rigid element. I thought of creating RBE2 elements linking the 4 nodes (see the image) : - "calculate node" as independant - "multiple nodes" (selecting the 4 nodes) as dependant Of what I understand, the 4 nodes will now be fixed from one another, like a rigid plane. Is there another method ? I also thought of another option : creating a rigid 2D plane. I don't know what would be different... But if you could explain how I can create one with these 4 nodes, it would greatly help. Thanks, Ben
  2. Hello, everyone, I have a question regarding RBE2 elements.I wanted to compare RBE2 and RBE3 elements. You can see the model structure in figure 1. I wonder why the elements, which are connected to the RBE2 element, are assigned a density of 0 in the optimization result (figure 2) and whether this is a viewing error. Thanks in advance
  3. I want to create connect two surface with rbe element is there any pratical way ? how to perform it best regards thank you
  4. プルダウンメニューFile⇒Run⇒Tcl/Tk Scriptから、下記のファイルを実行すると「RBE2_DOF-2456」のようにDOFに基づくセットを作成します。 CreateSetOfRBE2_DependsOnDOF.tcl
  5. Dear All, I want to ask about weld seam application, please see my picture below. figure1, I want to connect the elements in two components to simulate the weld seam. figure2,3.I use the 1D connectors seam application to create the seam weld.But there is a node with two REAR which leads to the error when solving the case.The acceptable model is one node connect with one REAR just as figure4. I want to know how to avoid appearing the condition as figure 3 and to create the correct model as figure 4. I have some confusing in RBE2 and RBAR, What different between in them? Best regards, Little_key
  6. Hello, I want to model a suspension using 1D-Elements. CROD are used to model the rods from the chassis to the wheel carrier. They are connected to the chassis using RBE3 with dof123 constrained to allow for free rotation. The problem is with the connection to and modeling of the wheel carrier. The rods need to be able to rotate freely around the connection points to the wheel carrier as well. I know about BEAM-Elements but as far as I know they only allow for free rotation around 1 axis. ROD- elements shouldnt constrain the rotations either, but they added stiffness to the model compared to the last option, a simple RBE2 with dof 123 from the end points of the rod to the wheel center as a central node. This setup with an RBE2 with dof123 as a wheelcarrier works good in analysis, but in freeesize I randomly get the error " *** ERROR # 153 *** Exactly zero pivoting encountered during Numerical Factorization; the model may have rigid body mode. " - My question are as follows: Why dont rods work as intended? They shouldnt constrain rotation as far as i know - Why does the rbe2 lead to that error? in analysis the flow of force makes sense and no anomalies appear, sometime the freesize even completes without any problem at all. - do you know of any way to model freely rotatable 1D-elements aside from the options above? Below is a picture of the model:
  7. Hi everyone. I would like to add rbe2 1d element according to a local coordinate system. How can I do this? Thank you.
  8. LKZ

    Rigid Body

    @George P Johnson Do you know how OptiStruct set the rigid body? I want to use rigid body to compare with my RBE2 in same model.
  9. What is difference between RBEs and CE_STRUCT in Hypermesh. Can I use RBE3 instead of CE_STRUCT ?
  10. Is there a command to get indepedent/master node details (id) of a selected RBE2/RBE3 element?
  11. Hello Everyone, I have been trying since very long on this problem but couldn't find a proper solution. I am experimenting on simple models to see whether the load between the shell and solid is transferred correctly or not. I have considered following three cases: A plate (100 mm * 100 mm * 8 mm) modeled completely with hex elements Same plate modeled completely with shell elements Half of the plate modeled with hex elements (from fixed end) And remaining half with shell elements The actual problem is the 3rd case, and to verify it's results, 1st two cases are being studied. I have tried different approaches (such as with skin elements, tie contact, penetration) but the answers were not matching with the 1st two cases. [The max. von mises stress in the 1st case =5.2e-1 MPa , and max. displacement in 1st case = 1.43e-2 mm ] The plate is fixed with a cantilever support and the force is applied at the free end (shown in the attached force - time graph ) Anybody please get me solved the .hm file attached herewith in the radioss solver. I also want to solve and test the results using RBE2 and RBE3 elements, but I don't know how to use them at the join between 2D and 3D mesh in my case. It would be of great help if the use of RBE2 and RBE3 would be demonstrated. ScaledUp_2D-3D_8mm.hm
  12. Hello, I am doing analysis of universal joint assembly (Yoke1, Spider, Yoke2). Spider is a cross member which has 4 bars extruded. So there are 4 revolute joints between trunnion and yokes. Can anybody tell me how to create a revolute joint using RBE2 elements in Radioss Bulk Data? https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQsTSispqWkYwMj6cy6vS8KmDxC2gM9aMmdf_Ffk06VMnPcRNnX To create a revolute joint between 1 bar and 1 yoke hole, I applied the following procedure: 1) Create a center node of the spider bar: node A 2) Create a center node of the yoke hole: node B 3) Create a RBE2 (Independent Node: node A, Dependent nodes: all the nodes on the portion of the bar which will be inside the yoke hole.) 4)Create a RBE2 (Independent Node: node B, Dependent nodes: all the nodes on the yoke hole.) 5) Create a local coordinate system having 'x' axis from node A to node B 6) Assign the node A and node B to local coordinate system. (set reference and set distance) 7) Create RBE2 (Independent Node: node A, Dependent nodes: node B; All dof constrained except dof4 (rotation in x axis) Is this method correct?
  13. Hi, I am trying to optimize the design of a control arm of suspension system. For that reason i have modeled the design in NX and exported in IGES format for HW-Hypermesh. Now for my optimization i am concerned with topology optimization of the yellow(design region) part of the arm. The green (non design) region is not to be optimized as per my design requirements. I used the organize command to move the design volume to design component and other to non design component, but while creating a mesh i am having issues. When i mesh the non design region using 2D mesh it got successful (non design mesh.png) after that i make design component as current and mesh it volume tetra mesh 3D, but it is meshing the complete part including nondesign space (design space mesh.png) Kindly check the issue.png about what i am saying. Please assist me in solving it and also once the meshing is done how to combine the design mesh and non design mesh so as in analysis and optimization it should behave as a single unit? The .hm file can be accessed from this link( https://www.dropbox.com/s/pujyaajiumo6zx9/suspension_arm.hm?dl=0) Thank you
  14. I'm doing an optimization to a rim centre. I defined multiple nodes to simulate different points of the contact patch. I connected the nodes with the washer area using rigids (RBE2) elements. The problem is that when I run OptiStruct it gives the error #723. After some research I saw that it's because different rigid elements have the same dependent nodes. However I need them to have the same dependent nodes. How can I connect the different nodes to the same area without having this problem? Thanks!
  15. Hi I am getting the following error. "RBE2 184065 187320 0 187321" *** ERROR # 1000 *** in the input data: Incorrect data in field # 4. I would appreciate any help I can get. Thank you.
  16. I have created an assembly model with around 200 RBE2 connections. My requirement is to measure the length of all the RBE2 element and save it as text or excel file. The number of RBE2 elements will vary from project to project. Is there any TCL script to measure the length of displayed RBE2 element and save the details as required. Or is there any other method to make the process simple by displaying the length of all the RBE2 element on screen, so that the length can be checked visually. Thanks, Prabhu P
  17. Hi, Is there any difference between rbody and rbe2 element in radioss. Both of them belong to family of rigid elements and for rbody we have option for providing mass and inertia which I think is not there in rbe 2 element. Also which is generally used for providing the connections like weld etc. in an assembly. One more thing is how to go for making a global rigid body from a multiple rigid bodies. As this causes node dependency, kindly let me know about the technique for making the same. Also how to provide a sensor or rbody off for based on any time condition.
  18. Hello, I've went through the tutorial: OS-2010 Design Concept for an Automotive Control Arm, and I'm interested in in creating rbe2 nodes and non-design areas for OptiStruct as observed in this tutorial. I've been unsuccessful in finding documentation which demonstrates how to create these. Could someone please link me to a tutorial, or explain the process? Thank you.
  19. Hello, I am using 3D tet elements to model a variety of bolted flange plates. I would like to use simplified 1D beam elements as bolts, with RBE2 to connect to each part. Is there a way to use the connector panel to help make this easier? I cannot seem to figure out how to do it for 3D meshes. Also, I have not actually meshed the holes as I am trying to reduce geometric complexity - I have just included a circular "washer" surface for the RBE2 elements to grab on to. My solver is Optistruct. Thank you, Justin
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