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asajd last won the day on September 3

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About asajd

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  1. Hello, If you were using Inspire Motion (2020) you could just use two actuators, like shown in attached video and model. Using Inspire you can export to MDL file and use that in MV/MS, if you wish. Regards, asajd IM_90degMotion.mp4 90degMotion.stmod
  2. Hello, Sometimes if you have a 'Point' in the CAD file it can lead to the error you report. Try removing it by configuring it off as shown in the attached video. ConfigureOff_PointCAD.mp4
  3. Not sure which release you are using on your end. You can see from my videos that I have been using Inspire 2019.3. From File - Preferences I do have the default setting of 'Autofind' turned On (it is under the 'Inspire -> Geometry' category). Regarding 'Feature based' vs. 'Manual' joints... The joints in Inspire are not surface based. Rather, it is looking for pairs of shared features, such as "Aligned Holes" or "Cylindrical Pairs" ... i.e. the options you can find in the Joints guide bar. Sometimes the default settings may not detect the joint that you may be expecting to find. On occasion this can be due to bad or flawed CAD geometry. In other cases you just need to override the defaults and make a manual setting. The attached video shows an example of this. In this use case there is a 3.5 mm gap between two cylindrical features, so the automatic detection is not finding the shared feature. By using the 'search distance' option we can specify a value of 5 mm use 'Find' and with that it detects the expected cylindrical feature for the joint. Refer to attached video and model (JointGap_Before.stmod) that you can use to reproduce what was shown in the video. manualJoint_useSearchDistance.mp4 JointGap_Before.stmod
  4. Using the attached CAD file, you should be able to follow the steps shown in the attached video. If that is not what you wanted, please attach your CAD file so we can see. Regards, asajd Inspire_ManuallyCreatePinJoint.mp4 TwoLinks.x_b
  5. If you use Inspire then you can optimize the topology of a part in "one click". 1. open CAD files in Inspire 2. organize model into design space and non-design space parts (use partitions) 3. mechanize the model (ground, rigid groups, joints, motors) 4. define design space 5. run a motion event. 6. click 'Optimize Part' and run the optimization. 7. when optimization run finishes you have a new topology shape for the part. Optionally you can export the .fem deck in step #5 if you prefer. Attached video shows one of the motion tutorials on this in Inspire 2019.3 OP_Motion.mp4
  6. ... model and video are attached. impulsiveForce_IM.mp4 2_simplified_SingleBC_Impulse_2019.3.stmod
  7. Using Inspire Motion you can use a Force Actuator and prescribe the Impulse function like shown in attached image.
  8. If you don't like using 'points' you can use Inspire to create your multibody model easily from CAD. Just use the 'Motion' ribbon. It is very simple to create a functioning model without points. Then you can export it to MotionView (by MDL) and it will have points, should you want them.
  9. Do you have access to Inspire Motion? Attached model can be opened and exported to MDL format for use in MotionView. Sincerely, asajd TransJoints_MarkerMotion_wContacts_DEMO.mp4 TransJoints_MarkerMotion_withContact.stmod
  10. Perhaps you could model it with 3D contact, see attached video for proof-of-concept. BallStud_3dContact.mp4
  11. If you build your model with Inspire Motion you can perform structural (FEA) analysis of the rigid body mechanism. You can get stress results like shown in attached video. IM_stress.mp4
  12. With Inspire 2019.1 you can use the Joint Coupler to create a rotational-translational relationship between joint movements. Please find the attached model and corresponding video. In this example a preloaded spring has been placed between the nut and bolt to represent the compressive load as the nut is tightened. Hopefully you get the idea here. Good luck. NutBolt_animation.mp4 NutBolt_viaCoupler_2019.1.stmod
  13. For simple spur gears it is often much simpler to just use a Coupler... it can run very efficiently because contact detection is not required. See attached ZIP file containing a model where coupler is used instead of contacts. Sincerely, Tony S. Spur_Gear_useCoupler.zip
  14. Inspecting the MDL file you provided there appears to be a mismatch between the part name and the internally represented name embedded in the CAD. Think of it as being a 'mapping problem'. This isn't your fault. The attached 'LG_parts.txt' file shows what I believe the part mapping ought to be. Try using the attached MDL and Parasolids file and see if that works out better for you. Sincerely, asajd Landing_Gear_4_wheels - Corrected.mdl Landing_Gear_4_wheels_x_t.8bbc17520c5a14e4688199a9da4b1a66 LG_parts.txt
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