AutoCAD Inventor :: Nodes In Frame Analysis
May 3, 2013
I have created a report from a frame analysis of an arrangement of I-Beam steelwork. I need to check that I have placed the nodes in the right order and this is reflected in the results of the report. I have the parent and child nodes connected at the ends of the beams as shown on the attached screen shot. I'm interested to know if the order in which I have selected the nods makes any difference to the results. There a 3 node connection points at each corner section.
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Jan 27, 2013
I am trying to run a simulation on a 4 layer part that has two base layers of I-beams, a frame I made in the frame generator (below) and a solid sheet on top. I am having some issues with the FEA side and was curios to see if the frame analysis tool would yield the same results as the stress analysis simulation. For the frame generator I saw 4 times the amount of deflection despite using (what I believe) are similar loading and constraints, however now I am unsure if I can trust to run an FEA simulation with a frame generated component. The frame is made up of 2 inch steel box beam with a 0.25 inch wall thickness. For the frame analysis package, I have applied a pressure that equates to a 70 kN load across four different sections of the frame. Supports have been placed under all four corners, with 1 being fixed and the other 3 free to move. For the FEA simulation, I applied a similar pressure by creating 2 inch wide plates and applying the same pressure at the same four points. There are also 2 inch square pads under the four corners of the frame with one edge of one pad being fixed and the bottom of the pads having a frictionless constraint. There are separation contacts between both the pressure plates on top of the frame and the frame as well as between the pads and the frame.
with the frame generator is that all the segments of the frame are bonded together (under contacts) which makes sense since they are welded together. However when I put a sheet on top of the frame, there are 3 contact points created between each beam on the frame and the sheet (one on the face of the frame that is in contact with the sheet and the other two on the rounds of the frame and the sheet, even though the rounds are not actually in contact with the sheet). Either way, I am seeing deflections of less than 0.1 mm when a 70 kN load is applied which I know is not right and just want to know if using a frame generated component is not possible with an FEA simulation.
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Sep 11, 2012
I've attached file. This is trestle and SWL(safety work load) is 2T. How can understandable that this load is going to be withstand by trestle.
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Jul 5, 2013
Having an assembly, modeled in the frame generator, then with some additional parts (ribs, plates, etc) added to the assembly as parts and constrained with assembly constraints.. which is the best way to do a frame analysis with the frame analysis enviroment for considering the all structure (frame generators parts + the additional enforcing parts) ?
The assembly look like for example, to this (modeled in autocad).
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Oct 8, 2012
explain the circumstances where 'Release' is applied to a beam (node?) when using the Frame Analysis tool.
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Sep 23, 2010
When I go to Environments>Frame Analysis, I used to get a menu for Constraints, Loads and other settings (similar to the Stress Analyisis menu). I don't get that now. I can right-click on an existing simulation and add constraints and loads, but I would really like to get the menu back.
I can go to tools>Customize, Toolbars tab and Frame Analysis Panel is there. I can click Show and it will show the panel but it stays up all the time. Not what I want.
I have tried resetting the menu, repair installing Inventor and Reinstalling Inventor, but still not joy. How do I get this back to the original setting so that it comes up when I select Frame Analysis?
This is in 2011.
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Oct 10, 2012
I understand that in a normal part to apply a load to a face is to make it a UDL (uniformly distributed load) by default. To apply a point load, I was told to create a small sketch and use it to split a face to create, in effect, a small face on which to apply a load, effectively making it a point load.
Now in the frame analysis environment, there is clearly an option for 'force' and one for 'continuous force' which the description clearly describes as a uniformly distributed load. However, when I run the simulation (on a 2m long 100mm x 50mm x 4mm Rectangular hollow beam) with a normal load in the middle of the beam (1m offset); the maximum moment comes out at 500000 Nmm or 500 Nm. By my reckoning the moment should be 1000 Nm as the basic formula for a moment from a point load is M = F*D (Moment = Force * Distance). However, to get 500 Nm, it looks like Inventor is using M = (F*x^2)/2 where x is the midspan of the beam (in this case 1m). .is a normal load in frame analysis the same as a UDL? If so..how to I make it a point load?
There are also some errors stating instability of type 2 at various nodes, I've used both Pinned and Floating constraints at either end of the beam.
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May 2, 2013
I have a question regarding adding a force constraint in the Inventor frame analysis environment. When I add the fixed constraint to the beam the orientation indicator is incorrect - the square indicator being not parallel to the base of the beam. I would like to know why this is and as I am relatively new to frame analysis if I am doing something wrong. I have attached a screen shot of the placement of the constraint on the beam.
Autodesk Inventor Professional 2013 SP2 64-Bit Edition
Windows 7 HP Z400, Intel Xeon W3550 3.07GHz
12.0GB RAM, ATI FirePro V4800 (FireGL)
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Sep 14, 2013
Does Frame Analysis uses the finite element method?
If it does, how to view/edit the mesh?
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Jun 14, 2013
I am trying to run a Frame analysis on a beam structure. I wanted a specific yield stress for the components that make up the beam. So I created a new material and changed the yield stress and change my beam components to that new material. However when I run the simulation the yield stress is not what I made it. Is this allowed?
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Jan 23, 2012
I am busy constructing my own Structural Shapes Library in Inventor 1012.During the Authoring and Publishing step I mapped Cross Section Properties (Ixx, Iyy, Torsional Section Modulus, Torsional Rigidity Modulus etc) to set parameters in my iPart table.
I have noticed that once this part is then used in Frame Generator to create a simple beam and then analyzed with the Frame Analysis tool, the analysis tool uses the geometry of the part to calculate these properties.
Is there a way that I can force Inventor to use the properties in the iPart Tables? I am worried that any errors in creating the cross section geometry will be carried into the Cross Section Properties calculated by Inventor.
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Dec 30, 2010
I created a structural shape profile for use in a project. It is square tube with radiused corners, very similar to "ANSI/AISC (Rolled Steel) Structural Tubing Square" in the content center, but mine is 1 inch square with 0.065 inch walls.
I've made a chassis out of my custom tubing. When I run a frame analysis on it, I get an error/warning stating that the torsional section modulus is zero, because I didn't fill in the value when I generated the frame. How do I calculate that value?
I've attached the tube that I used to make the structural shape.
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Nov 29, 2010
Simulation Frame analysis crashed when choose button Simulate. Write failed to connect solver.
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Jan 6, 2012
I have tried the Frame Analysis for the first time and quit from this option as requested.
BUT now the subassemly consisting frame and all its parts are grey even after restarting Inventor.
Here is some bug. [URL] ....
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May 22, 2013
After using Custom Profile for Frame Generator, the Part List will show total length, not individually. How to split these frame members?
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May 20, 2013
I created an extruded aluminium profile (attached file: Item Profile 8 80x80) which I published into the Content Center. When using this profile in a frame design, and using the Trim To Frame command, the profiles are trimmed at a weird angle (attached pdf file).
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Apr 30, 2013
After using Custom Profile for Frame Generator, the Part List will show total length, not individually. how to split these frame members?
Inventor Professional 2013 SP1.1
Windows 7 Pro 64-bit, SP1
HP EliteBook 8460w; 8 GB RAM; i7 - 2.0 GHz; AMD Firepro M3900 -1 GB
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Dec 13, 2011
There should be a way to Notch a straight frame to a curved frame! I want to laser cut the tube, so I really need to trim one tube to a curve tube.
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Jul 26, 2012
I come across this problem from time to time and generally either just ignore it, if the detail is destined for in house manufacture, or alter it in autocad if it's destined for exterior suppliers.
Our guard frames are manufactured from extruded aluminum section (made by a company called palletti) I have when needed created a new frame generator frame member for each new x-section that we wish to use. I then draw a 2d sketch for the base frame skeleton and then a 3d sketch for all the frame work above. This I then use in an assembly to create the framework. This framework assembly then goes into a second assembly where the framework is then adorned with all the accoutrements that make up a guard frame that we can then order as an assembled frame, panels feet, hinges et al.
When placing the views for the detailing of the second assembly sometimes the view will show the wrong length for one or some of the frame members.
;note how the left and right views are different and how some of the frame members are elongated on the lh view.
I'm guessing its because of the home grown frame members but all seems to work well other wise and this only happens infrequently.
HP z210 16Gb ATI FirePro5800
Autodesk Produst design Suite 2012
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Feb 22, 2012
Is it possible to determine which nodes are expanded using the API?
I want to make some changes to the node information in an assembly browser but as there are many hundred parts so I only want to do the operation on the expanded nodes to keep any delay to a minimum.
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Jun 4, 2013
Is the alpha sort function available trough API ? It's located in Assembly tab, Productivity tools. I'd like to use it in a custom program instead of asking my customer to click on the button.
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Jul 3, 2013
how to create an iLogic rule that automatically renames the browser nodes based on part number. I know that this is a function in Inventor itself. The problem is that there is no built-in functionality to automatically change the default browser name to something besides part number. I've done a lot of digging and I came across the following code from an old thread discussing Inventor 2011. I am interested in 2013. It is also worth noting that when I run this code, my Inventor crashes.
PrivateSubMain
UpdateAssyBrowser(ThisDoc.Document)
End Sub
[Code]....
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Jun 28, 2012
Trying to find a way to increase the size of the 3D spline nodes so that they can be seen easier. Is there a setting to control this?
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Jan 7, 2013
Is there a way to rename browser nodes within a part in a similar way that the rename browser nodes tool works in assemblies? I am copying designs with derived parts, after copying the design I can see that the part files contain the correct links to other parts when I open the base component but they display as the old name in the browser which is not ideal.
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May 29, 2012
What I am trying to do is importing a CorelDraw file into Inventor and extruding a few features. The point is to mimic a silkscreen file on metal work. My work process has been as such: create the file in CorelDraw and change all lines/shapes to curves. Save the complete CorelDraw as a dwg. Open the dwg in Inventor and copy and paste the sketch into a new part in Inventor. This process seems to work for simple parts. As soon as there is text and more complicated features there is alot of points which slows my computer down and makes it impossible to do anything. Any way to auto-reduce points in a sketch or have a better way of importing vector files into Inventor? I have tried importing the text as text instead of curves but it does not transfer correctly.
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Oct 20, 2011
I`m trying to determine will Inventor satisfy the needs that I`m having regarding simulation options. So I started with some elementary stuff.
If it is possible in stress analysis to manually select which degrees of freedom body has.
"Fixed constraint" block all 6 DOF and I would like to block only transitional DOF so that I keep rotational degrees of freedom?
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Dec 22, 2011
I have purchased the Autodesk Product Design Suite Premium. It comes with the Frame Generator but does not seem to have the Frame Analysis with it. Is that provided in other Suites or should I have it??
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Oct 8, 2013
I am trying to simulate the following:
I have an 8" OD/5.523" ID steel tube. A 5.5" OD/4.957"ID tube is placed inside. The 8" and 5.5" tubes are placed over a 4.9375"OD shaft. So basically you have a hollow shaft attached to a drive shaft, with a filler tube placed between them to fill the gap. Two 1-1/2" UNC bolts are placed in matching1.531" diameter holes in every component (thru bolted) with a nut. Tightening the nut will tend to flatten the pipes, taking up the clearance between then and creating a contact pressure on the drive shaft. I have having trouble getting all of the contacts correct since the components are not in contact at the beginning of the simulation due to the radial clearances.
Two axial bolt loads of 129,000 lbs will be placed on the tubes. I have used a sliding/no separation contact between the bolt and nut. Then I put a fixed constraint on the bottom face of the nut (not in contact with the tube) and put a 129,000 force on the top of each bolt head to simulate the axial load created by the bolt preload. What type of contact should I use between the tubes that have radial clearance?
I have attached the tubes and drive shaft. The 1-1/2" bolts and nuts (both heavy hex) were found in the library.
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May 9, 2013
How to set up a symmetric stress analysis?
I read about using symmetric analysis on a symmetric assembly, but no description of how it is done.
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Jan 6, 2014
I am trying to properly stress test a steel aircraft fuselage. I can easily model the estimated weight of the pilot, copilot, etc as loads on the airframe. However, when it comes to simulating a high-G situation, (a load factor of around 7.5 times the force of gravity), I am not sure what to do. On one hand, I can simply multiply the loads on the airframe by the load factor and see if the frame can take it. In most cases, it performs very poorly, (safety factor less than 1). However, if I model all the loads under normal conditions, (normal pilot weight, etc.), then add a gravity load equal to 7.5 G, the airframe performs well. Yet I am not sure if the loads on the airframe, (such as pilot weight), are being adjusted along with the increased gravitational load.
My question is, what is the best way to accurately simulate real world loading for high-G situations?
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Oct 9, 2013
I am doing an eigen frequency analysis of a structure in the range of 0 to 1500 Hz. For my structure I am getting about 6 modes as expected.
For the final results I will mass normalize to convert to an energy based on the relative "displacements" However, each of the "displacements" for the 6 eigenfrequencies are the same?
I know this can not be right as it would mean that all have the same energy which is impossible.
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