AutoCAD Inventor :: Simulation Stops After First Iteration And Mesh Disappears
Feb 2, 2012
I often use the FEA tool of Inventor, I already had some "known issues" like degenerated element.
I have to test if a tank (full of oil) can resist at a 10G shock in every axes (six simulations separated). For simulated the oil, I created a part from the tank assembly using boolean tools (combine, and so on...). Then I applied the stresses on the oil part, in the interaction surfaces between oil and the tank.
When I mesh, there is no problem, I can save, quit and load the assembly, the mesh is OK. Once I have set all the parameters, whatever the simulation settings, I can see the message: "Adaptative refinement" then it stops after the first iteration, and the mesh disappears.When I repeat it, sometimes the simulation is blocked at the "adaptative refinement" step. I cancel it and a "mesh error" appear...
I have a user who has a problem with creating meshes in the Inventor Stress Analysis environment. When trying to create meshes in assemblies (after clicking the Mesh View button), the Mesh progress meter gets to about 80% done, then backs up a step, then never moves forward after that. He has let it run all night and no further progress is made. I noticed that the FEAComputeServer.exe process uses 25% to 50% of the CPU usage until about a minute after the mesh progress meter stops. Then the FEAComputeServer.exe CPU usage drops to zero.
The odd thing is that this is happening on only 1 computer. The exact same assemlies can be meshed without problems on his laptop and my computer. We have tried the following to solve the problem:
1. Adjusted Mesh Settings to various values.
2. Both Inventor 2014 SP1 and Update 1 for SP1 are installed
3. Updated the video driver. Video card is a NVIDIA Quadro 4000. Video driver is version NVIDIA's 331.65 WHQL certified ODE driver.
4. Uninstalled and reinstalled all Autodesk products using the procedure at [URL]
5. As part of the uninstall, we also removed MS .NET Frameworks and C++ Redistrubutables so that the Autodesk installer would install it's preferred flavor of these utilities.
6. Reinstalled SP1 and Update 1 for SP1.
Since the issue is happening on just 1 computer, I don't think the issue is related to the part geometry itself. The only other thing I can think of that could cause this is just bad hardware.
Below is my test procedure for "Create Curve Mesh Element" by Inventor simulation 2012.
1. I made a box 100(W)X100(D)X20(H) with 2xR20 (mm) fillets at the opposite edges.
2. I copied a box I made for making 2 type mesh.
3. I made mesh on the box without "Create Curved Mesh Elements" option.
Node number: 2374 Element number: 1365
4. I made mesh another model with "Create Curved Mesh Elements" option.
Node number: 2374 (same number, not increase) Element number: 1365
Mesh shape is different(please refere attachiment jpeg file).
I think that "Create Curved Mesh Element option" is not for making second tetrahedron elements.But I cnanot the true porpose of "Create Curved Mesh Elements" option.For only P method, not H method?
In optimizing a new assembly I'll often have several iterations where I take an assembly to a point and would like to keep that design intact, yet would like to move on from there with new design features based off that existing design.
Currently this is the way I archive these fully functional design iteration steps that may be created just a few weeks apart.
Open assembly - save as "LinkageDesign-7.iam"
Open each part individually - save as next part # sequence...
In the new assembly then RMB click on each part and replace with new part # sequence that I just saved.
Parts keep all their contraints and are ready for me to start adjusting, all the while having the other version still intact so I can compare directly 2nd iteration with 7th iteration.
A way to do this with fewer clicks? As the larger the assembly the larger the task at completing this.
I have an assembly with a FEA simulation result. I can run a report and get the reaction forces and moments at each constraint. I would like to run a new simulation with different constraints and use the reaction results from the first simulation as loads in the second one.
Currently I do this by running a report on the 1st simulation to get a table of the reaction results. I then manually add those forces to the 2nd simulation. This takes time to type and the forces must be edited each time I re-run the 1st simulation.
Is there a way to use parameters to automate this?
I'm attaching part of my mesh with another using the Boolean Tool. When I do this part of the mesh I'm using disappears when it shouldn't. How do I fix this?
Before Boolean (showing the two parts)
After Boolean (look at the railcars far left side its gone)
I have an assembly that has somewhere a hole with a round bar that exactly fits in this hole. But when meshing the assembly, the mesh of the hole and the mesh of the bar are different.
The result is that the different parts do only seem to touch each other at the edges of the mesh, resulting in high stresses.
See picture.
I tried to made a derived part from the assembly, but that one does not finish meshing. After 48 hours, the progress bar is still half way. While the one above did finish in about 15 minutes. What can I do to make the meshes match?
I've created a successful FEA simulation in Inventor 2014 and obtained results. But I want to see the highest stress in a defined area that is smaller than the entire part (I have some stress concentrations that are throwing off my 'max'). Is there a way to probe an area instead of just a point? I'm tired of creating a dozen probes to find the 'local max'.
I'm developing a program which runs several simulations and obtains the results automatically.
I'm using the dynamic simulation API created in Inventor 2013. For that I use the GetResultValues(ByRef values() as Double) method of the class DSResult.
I used the method inside the VBA of inventor and worked well. But when I wrote the program in Visual Basic Express 2010, the method doesn't return anything.
I share an excerpt of the
Dim odoc As AssemblyDocument odoc=invApp.Documents.Open(testPath, True) Dim dsman As Inventor.SimulationManager = odoc.ComponentDefinition.SimulationManager Dim dssim As Inventor.DynamicSimulation = dsman.DynamicSimulations.Item(1) Dim oJoints As Inventor.DSJoints = dssim.DSJoints oJoint = oJoints.Item(1)
[code]....
The method GetResultValues(values) should modify 'values' to a time,value vector.
It works well inside Inventor, but doesn't in the program in VB, although it runs the simulations and does everything else right.
when in simulation, if you suppress a feature is it totally taken out of the simulations workings?
I.e. if I was working on a project like some weighing scales and I had a load of objects on the scales and I then suppressed some of the objects, will the scales rise up a little to counteract the reduced weight?
Is this type of gravity experiment possible with dynamic simulation?
[URL].........
I made the cone ramp and double cone but the cone either goes the wrong way or only moves a few inches in the correct direction and then gets stuck. I’m using 3D Contact Joints and Spatial Joints and Gravity Force.
i'm developing a hexapod robot and i want to simulate the motion of the robot's leg. The mechanical of robot's leg contain a servo motor that variate your angle between 0 to 330 degre. How can i delimite the angle of servo's rotation?
Other questions, is about the fixation with bolts. How can i do for the motion simulation respect the connection of the bolt? when i do a dynamical simulation the parts that contain bolts don't stay joints, i have to do a rule of fixation with constrains?
I'm designing multiple elements for a vehicle. I need to evaluate multiple dynamic results of multiple possible designs. All the design is parametric so it modifies quickly but I can't find a way to run the dynamic simulation multiple times automatically and get the results from the output grapher for each simulation.
I am trying to do it via API but can't find the class of the dynamic simulation environment in the Object Model Chart to program it via .NET.
I have a very simple part I am trying to check using FEA; however when I get into the Simulation environment and click 'New Simulation' from Ribbon nothing happens.
The part in question is just a simple cylinder (I'm verifying what would be the best meshing spec to use in a larger assembly).
I am playing with traces in dynamic simulation and in the output grapher i get values for position like:
P P(x) P(y) P(z)
and in the graph i get some values of the position but i am unsure on where the datum is at this point. I would of thought that the datum would be where the trace is attached? Where the datum is based and is it possible to set a relative datum to when the trace is set?
I'm running several dynamic simulations via the API. Then I am getting the results to write in a text file. I want to know the force in a joint so I get the vector of values via
Dim oResults As DSResults Dim oResult As DSResult Dim value() as Double Call oResult.GetResultValues(value())
this vector is a time, force vector but when I verify mi data against the Output Graphe all the decimal points from the force information are gone.
Example:
In Output Grapher
Time (s)Force(N) 0.0118955.66 0.0219500.88
In the vector from API
0.01 1895566 0.02 1950088
is there a way to correct this? I'm getting many force and movement info, so I don't know which ones are reliable.
I have a question regarding simulations in Autodesk Inventor.
For example I have such part:
It is a plug made out of brass. I want to test if it will be able to withstand specified pressure. So I set up where is it constrained - on thread.
And set up pressure from inside on the cap to be 16 bar (1,6 MPa). And also assign materials. And there goes simulation . Everything seems alright. I want to run little bit different analysis. When pressure would be variable.
For example I will have pressure going from 12 bar to 16 bar, and such simulation will be running for quiet long time (as an example pressure will be 12 then raises to 16 then goes to 12 again and then raises to 16 again). I want to know after what time will this plug fail and will be destroyed? I mean i want to know when METAL will get tired and will be destroyed? I was just wondering if such a simulation is possible to be made in Autodesk Inventor?
If you can imagine a cylinder sliding on curve joint. Let’s say the curve is in the XY plane. In the output grapher it is possible to display the force as the cylinder slides around the curve. However if I understand it correctly the magnitude of the force will be in the direction perpendicular to the point of contact between the cylinder and the curve? In which case is it possible to actually find out the individual X and Y components of the force? That is to say the magnitude of the force in the X or Y plane of the curve?
Let me preface this by saying that we work mostly in the metal fabrication industry dealing with the elastic deformation of plastic materials that are isotropic so this question is a bit above my pay grade here.
Is it possible to simulate the stresses in a piece of glass in a simple beam scenario in Inventor (1/2" x 48" x 130" Tempered Glass)? I have a client that wants me to design a conference room table for him but I am highly uneducated about glass.
Is it possible to simulate? If not, is it possible to "fake" it and get semi-reliable results? We're at the conceptual stage here and we're curious which of our designs have a greater possibility of surviving the design validation process (which will include a glass expert at some point).
Every now and then, but recently more then I want, I get a blue screen while doing a stress analysis.
I have a pretty simple assembly with just 2 parts in it. One of these parts is built as a multibody part. It can be that the blue screens started to occur after I made a multibody design, however I am not sure about that. I downloaded and installed Inventor R13.
is their a possibility to applay stress like dynamic i have a shaft that has a pully on it , its conectet on an old way
not with a tight fit so it shrinks on it but it works wit a small cut in the shaft where its bolted with just a tiny metal plate.
at this place will be a stress concentration and i wanne see how the noth effect is when their is a dynamic load on it cause if i put a static load on it i know the shaft can handel it but i real life it has broken couple of times so this is what i want to investigate.
why there is huge difference in Dynamic Simulation results when you use two different input methods? I used input grapher and in linear ramp, I entered input (time/ distance) manually for 6 points and ran simulation. Then I used Spline and used a text file to enter SAME data and it gave me at least 10 times different results. Can't figure out why this difference. This changes my entire design.
I have a dynamic simulation which seems to have corrupted itself. I have a number of Revolution joints which are torsional springs. I’ve enabled joint torque and set a spring stiffness and a free position (+15 deg). Then on the ‘initial condition’ page I’ve set Max (+45 deg) and Min(-15 deg) Bounds on rotation angle and set a stiffness 10x the spring stiffness to simulate the end stops of my torsional spring. The initial position is +12 deg. This was working just fine but since I’ve added a couple more parts (nowhere near these springs) I constantly get the message “The parameter xxx value is out of bounds”. Where xxx is the ‘Initial position’ of the joint. If I edit the joint and untick the Bounds section the message goes away but if I tick it (which I need for my simulation) I get the error message as soon as I pick OK. The position is NOT out of bounds?
When I select "Start Simulation" from the Add-Ins tab, nothing happens. The hourglass comes up for a split second, but nothing launches. We have Simulation 2012 Mechanical installed on the machines. I have tried with both parts & assemblies. Obviously we can launch both applications separately but it's nice to go back and forth using the quick launch.
The machines are both Windows 7 Pro (latest service packs) as well as Inventor & Simulation 2012 (Product Design Suite Premium to be exact.) Inventor has the latest service pack SP1 installed. This did work in previous versions of Inventor.
Is it possible to show the deformed nature of a shaft after loading along its axis and simulation of the part. If you take as an example a rod of Plasticine and stretch it you will see the center section thinning,the same laws apply to a rod of steel during stretching,why is it that this is not shown during the
simulation of the part,is it mesh settings or something that is not built into the analysis. When one applies loadings to sheet metal the deformation is clearly shown.
