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Found 6 results

  1. I am performing a modal analysis of my sheet metal structure and I have used rbe3 and rbe2 elements to connect two sheet metal part mesh. But, it showing error as saying "massless body found". I want to ask that in modal analysis rigid body work or not?
  2. I have a vibration isolation model, as below picture, blue, green and pink part represents shaker table, specimen and constant mass, respectively I would like to assume blue and pink component as rigid how to perform it ? and Do I need to assign a material card to these components? aaa.fem
  3. Hy all, I am trying to make my own study on a cantilever beam (implicit option) in order to master the basics of Radioss, and I take as an example the example 37_cantilever_beam. Though, I get 2 errors in the starter coming from the rigid body: ------------------------------------------------------------------------- in the rigid body definition ERROR ID : 55 ** ERROR IN INPUT FORMAT DESCRIPTION : -- OPTION : RBODY -- BLOCK : /RBODY/301 -- LINE : /BEGIN ------------------------------------------------------------------------ in the rigid body initialization ERROR ID : 274 ** ERROR IN RIGID BODY DEFINITION (INERTIA) DESCRIPTION : -- RIGID BODY ID : 301 -- RIGID BODY TITLE : FREE_EDGE RIGID BODY HAS A NULL OR NEGATIVE INERTIA ---------------------------------------------------------------------- I don't understand the first error at all, having compared my starter with the example. Concerning the second error, I indeed input "0" for each inertia parameter, but this is also the case in the example. What do I do wrong ? Find attached my starter file. Thanks in advance, Alice pression_statique_02_0000.rad
  4. Hello all, I have a rigid body impacting a device. It is a frontal impact and the rigid body is not supposed to turn. However, as I input initial velocity (on master node only), the rigid body behaves on its own during simulation. So I constrained all rigid body nodes in X and Z directions (impact on Y direction). But I get a warning: WARNING ID : 312 ** INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL DESCRIPTION : 2886 INCOMPATIBLE KINEMATIC CONDITIONS IN MODEL 1. I don't think my kinematic conditions are problematic. 2. My simulation works but the rigid body still turns on itself and does not respect the bcs condition input How can I solve this problem ? Thank you in advance, Alice
  5. Hello everybody I am a new user of Hyperworks softwares. I'm doing the tutorials of hypermesh and radioss. I am encountering a problem with the tutorial RD-3510: Cantilever Beam with Bolt Pretension. I get the following error in Tool > Model Checker > Radioss Block "Rbody ID is different from master ID" I don't understand this error and I don't know how to solve it. I have just attentively followed the tutorial. Moreover I tried to run Radioss, keeping the error. The job is completed but I don't get any hyperview file. How can I deal to get an Hyperview file please ? Thank you
  6. Hi all, I model a hammer, impacting a component. To reduce computation time, and as I don't need any information about the hammer's stresses and strains, I want to model it as a Rigid Body. Though, I wonder about inertia and mass input in rigid bodies, as I get the following warning and error : WARNING ID : 542 ** WARNING RIGID BODY INERTIA ERROR ID : 274 ** ERROR IN RIGID BODY DEFINITION (INERTIA) And here my input: /RBODY/402 HAMMER # N_master I_sens I_skew I_spher MASS Grnod_id IKREM I_CoG Surf_id 39178 0 0 805 0 # Jxx Jyy Jzz 1.87779E+06 371038 -1.87779E+06 # Jxy Jyz Jxz 0 0 404038 # Ioptoff 0 If I delete inertia inputs, my computation works fine. However I need mass, because I work with initial velocity and mass is therefore important. So I wonder : - I input material (density) and mesh, so maybe I do not need inertia and mass input OR - maybe I should input MASS in rigid body OR - do what I did but something is still wrong ... Thank you, Alice
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