topic Re: FEA on Large Robot Jig in Inventor Forum

FEA on Large Robot Jig

zondashF5M2Q — Fri, 04 Mar 2022 16:48:17 GMT

I am needing to perform an analysis on a large robot jig that is picking up and moving parts. It has one attachment point to the robot, and then 6 attachment points to the object it is moving. I am trying to determine stresses on the frame of the jig as it picks up and moves this object at maximum acceleration. How exactly can I even do this? Would Inventor Nastran be more suited to performing an analysis of this scale with lots of frame pieces and a complex path to calculate forces?

Re: FEA on Large Robot Jig

JDMather — Fri, 04 Mar 2022 20:18:20 GMT

Environments>Dynamic Simulation - Export to Motion Loads Analysis.

Re: FEA on Large Robot Jig

zondashF5M2Q — Fri, 04 Mar 2022 20:36:00 GMT

Thanks. The tool path of this robot follows a very irregular path. Is there a way to input a trace of the tool path from recorded date from the robot? If not what gives me the best option for replicating the path of the robot arm.

Re: FEA on Large Robot Jig

zondashF5M2Q — Fri, 04 Mar 2022 21:09:25 GMT

I am also struggling to induce the motion to the jig frame. my assembly only has the jig frame and not the robot it is attached to. how can I set up a joint if my entire assembly will be moving during normal operation.

Re: FEA on Large Robot Jig

JDMather — Sat, 05 Mar 2022 12:29:40 GMT

Input Grapher.

This topic is quite advanced use of the software.

Re: FEA on Large Robot Jig

zondashF5M2Q — Mon, 07 Mar 2022 16:10:06 GMT

My 2 thought processes are find a way to input the motion to the part and do an analysis on that motion, or I will have accelerometer data on the jig assembly so I could determine the highest instantaneous acceleration and then do some kinematic calcs to determine the acceleration at each clamping point on the assembly. Maybe there's another software that is more designed for this type of analysis?

Re: FEA on Large Robot Jig

JDMather — Mon, 07 Mar 2022 17:28:38 GMT

@zondashF5M2Q wrote:

Maybe there's another software that is more designed for this type of analysis?

Why?

Are you expecting an "Easy Button" solution?

Re: FEA on Large Robot Jig

zondashF5M2Q — Mon, 07 Mar 2022 17:53:44 GMT

I'm fairly new to doing FEA in any type of software so I'm a little uncertain about what can and can't be done with the Inventor FEA. The forums here have been a good source of learning to figure out what I'm doing. So not an "easy button", but maybe a method of doing things or a tool in the software I am not aware of

Re: FEA on Large Robot Jig

Frederick_Law — Mon, 07 Mar 2022 20:55:59 GMT

Find out max G the robot can do with the jig and parts on it.

Apply that to the jig on different directions and check FEA results.

Analyzing the jig on the robot path is great but you'll need to do it again when path change.

If you design the jig to work with max G in any direction, you are good for any robot path.