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Found 4 results

  1. My error is : *** ERROR # 153 *** Exactly zero pivoting encountered during Numerical Factorization; the model may have rigid body mode. Solver error no. = -503 spc set id = 3 index = 1 Possible reasons are: 1) insufficiently constrained model, 2) having rigid body mechanisms within the model, 3) extremely ill-conditioned rigid element sets, 4) extremely thin shells (as used for skinning) that have MID2/MID3, 5) gap elements with extremely high stiffness (KA, especially KT or MU). Check the model and rerun the problem. (MECHCHECK may be used to find the rigid body modes. To do so, change the input to be an eigenvalue analysis and add MECHCHECK.) (WARNING: results obtained with MECHCHECK cannot be used because the model is changed internally.) This error was detected in subroutine bcsmtxfct. At this case, I want to simulate the two beams with ball and revolute joints in gravity condition. I use the revolute joint and ball joints at two beams . and I set the gravity at the model with no constrain condition (I use the Control Cards = PARAM INREL=-2). This is my joint set, I also want to ask what is different at FE & MBD. This is my model. 5.fem Really thanks!
  2. 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?
  3. Can I model a revolute joint with HyperMesh? If so, how to do this? Does any tutorial show this?
  4. I am practice non-linear static in Optistruct. I want to know how to set the revolute joints. I have seen the RD-4000: Dynamic Analysis of a Three-body Model using RADIOSS in HyperWork10, but I can't find it's file. And I hope the example is used by Optistruct.
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