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Problem produces NO rigid-body modes when you’ve replaced the GapĮlements with springs, then you know for sure that the Contact Running the ‘real’ study yet, so we can throw a few darts. Low – and you WILL have over-supported the selected faces a little bit.īut again, you’re just looking for which parts want to walk away, not Spring stiffness pretty high, but the tangential spring stiffness very Or, you could replace the Bonded contact, with either an Elastic More Mode Shapes – ignore the responses you know are not ‘real’) Purpose of diagnosis, (which will too sloppy, and you’ll have to ask for Kind of Contact in it, you need to either ignore that contact for the
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Problem, will NOT allow you to create sliding or intermittent Contact Important caveat: The Modal Analysis method of diagnosing your The model-shape plot, and it will be patently obvious which parts are
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One should show you some rigid-body motion, (and remember, it could alsoīe a rotation!), of the part or parts that are un-tethered. even with under-supported parts.Īnd, when you activate the plot for the lowest 2 or 3 mode-shapes, each Of the Modal study are being solved differently than a Static study, the Just the restraints and bonding, because we are not going to ‘push’ yourĪssembly in any particular direction, we are instead going to vibrateīut, you DO still have to turn on the “Soft Springs” option to stabilize the model. You do NOT have to copy over your system of loads – SoĬreating this Modal study to diagnose your problem should take, like, 30 Of your screen, and DROP it into your new Modal study. Restraints, and DRAG that folder down to the row of tabs at the bottom Your first, “real” study, you can then select the folder for your Of people I encounter still don’t know you can do this. Wait – I did NOT say to re-create all your Restraints and BondedĬontacts. Then you copy all your Restraints and Bonded conditions into the new (this is a diagnosis, not a true study, so you want it to run fast). To only ask for the lowest 2 mode-shapes, or maybe 3, but no more.
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The second approach is to Shake the assembly, instead of moving it.Ĭreate a new Modal Study, (this will require the Simulation license toīe Simulation Professional or higher).
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Same direction that they are free to move, and then the “Soft Springs”ĭo not supply enough stabilization. Because the other half of the time, theĪpplied loads might act directly on the under-restrained parts, in the Leading zeros), and then animate the displacement plot – and you’ll seeĪt the start of the animation, which parts are un-tethered, and in whichĪ cool and easy trick. Set your Displacement scale factor to be wicked small, (think many They are not missing – they simply went flying off the screen. Or you might see that one (or more) parts seem to be missing from the Then, when you plot theĭisplacement results, you might very well be looking at an empty screen, Tell it to continue running the study anyway, as-is, without Produce a warning message, that very large displacements wereĭetected). About half the time, I find that the study will now run, (and Sometimes you can simply turn ‘soft springs’ on, and run the studyĪgain. Problem, and they both use the study Property option, “Use Soft Springs Wasting the entire morning? There are two ways I approach solving the The study won’t run, you can’t display the displacement plot, and see That means that at least one component is not correctlyīonding to a neighbor, and so is free-floating. Minutes, at least, creating the BONDED contact conditions to tie theĪnd now when you try to run the study, you get the failure message, “Zero or indefinite stiffness matrix”. Together all the mesh bodies of similar type. You are relying on the GLOBAL CONTACT – BONDED to tie It has a mixed mesh – Solid elements, also Shell elements, maybe also You have created a Simulation study of a fairly large assembly. Optimize design concepts for performance, minimize product weight, and (FEA) analyst, with SimulationXpress you can develop skills to help While not everyone is devoted to being a Finite Element Analysis SimulationXpress provides 13 core capabilities in all versions of SolidWorks, and Simulation Premium provides a total of 76!
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