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Rigid Dynamics for a Mechanism Kinematic – Solution fail

    • Cristhian Mendez
      Subscriber

      Hello,

      I have been working with Rigid Dynamic to replicate a Kinematic from CATIA:

      Picture 1. Kinematic

      Picture 1: Kinematic

      I almost finish, but I am current facing a problem when I try to bond 2 parts, which are a sheet metal and a plastic overmold:

      Picture 2: Bonded parts

      You can see what is the expected behaviour in the picture 1. 

      I've already defined the respectively joint for both parts and test them individually to see if they behave as I expect in free state:

      Picture 3: Overmold behave

      Picture 4: Sheet metal behave

      They look good. So, now I need to bond them to get the whole result.

      For that I have set a Fixed joint :

      Picture 5: Fixed Joint (Metal sheet + overmold)

      Then I run the solver, but I got a failure during the solution process. Solution information attached below.

      I have done several things to try to solve it, but I haven't success. Can you help me with this case?

      Solution information
      Initializing transient simulation

          Position correction is enabled.
          Velocity correction is enabled.
          Correction uses Pure Kinematic.
          Assembly uses Inertia Matrix.

          Creating Internal Loads
          Creating Flexible Bodies Internal Drivers
          Updating Loads and Drivers Based On Internal Joint Representation
          Updating Stops Based On Internal Joint Representation
          Creating Stops Contact Points
          Updating Relations Based On Internal Joint Representation
          Initializing Transient Analysis

          ______________________________________________________________________________________________________________________________
          Starting assembly simulation

          Stopped Stop Minimum Bound on Joint General - 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 To 29 31094 -.1\29 31434|00 -.1\(29 31434)_PUSH ROD RH OVERMOLD|Solid.15, DOF 1 during initial assembly
          Stopped Stop Minimum Bound on Joint General - 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 To 29 31100 01F.1\29 31127 -.1\(29_31127)_PIN_MEC_4|Solid.3, DOF 0 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Stopped Forced Frictional Sliding - 29 31092 -.1\(29_31092)_PANEL CARRIER OVERMOLDING_RH|Solid.12 To 29 31113 -.1\29 31308 -.1\29 31381|00 -.1\(29 31381)_LIFT_CAMSLOT_OTR_RH|Solid.2 during initial assembly
          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly
          Convergence reached after 5 Iteration

          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 during initial assembly

          Analysis of model redundancies:
          Joint Fixed - 29 31100 01F.1\29 31109 01F.1\29 31105 -.1\(29_31105)_TILT_LEVER_RH|Solid.3 To 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 shows some constraint redundancies
          X Rotation constraint equation was at time redundant
          Y Rotation constraint equation was at time redundant
       
       

          _________________________________________________________________________
          Starting transient simulation

          Using MJ Time Stepping time integration

          Force residual tolerance is 1.000000e-07
          Position constraint residual tolerance is 1.000000e-08
          Velocity constraint residual tolerance is 1.000000e-08
          Integration tolerance is off
          Model Summary:

          Number of effective bodies: 15
          Total Number of Joints: 17 (14 based on degrees of freedom, 3 based on constraint equations)
              3 Joints of Type General
              2 Joints of Type Point On Curve
              3 Joints of Type Revolute
              1 Joint of Type SingleRotationGeneralJoint
              8 Joints of Type Weld

          Number of Physical Degrees of Freedom: 14

          _________________________________________________________________________

          Stopped Forced Frictional Sliding - 29 31100 01F.1\29 31109 01F.1\29 31102 -.1\(29_31102)_PIN MEC_1|Solid.9 To 29 31100 01F.1\29 31107 -.1\(29 31107)_BEARING TILT LEVER WITH ROLLO SPRING|Solid.368 at 0
          Murty's algorithm reached maximum number of iterations: 289
          Last 3 minimal values are -3.788397e-02 -4.214779e+10 -3.788397e-02
          PSOR algorithm reached maximum number of iterations: 289
          Initial residual 7.136916e+01 Last 3 residual values are 8.065929e-01 8.065929e-01 8.065929e-01

      *** Warning:
          None of the LCP solvers succeeded, Abort computation.

          No set of active contact stops can satisfy all the constraint equations. Solve cannot proceed

       Solve failed
       
          InitializeTransientDynamics failed

    • peteroznewman
      Subscriber

      Put both sheet metal and overmold bodies into a single component. In that way, no Fixed Joint is needed.

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