Transient Structural Capability

[eggheadkhan]

Hi,

Would it be possible to create this type of analysis in Inventor Nastran?
 
I am embarking on dynamic FEA due to needing data on this type of motion to complete a design...

[viktor_velichko]

Hi! Can you describe your problem in more detail?

If this is a task of rigid body dynamics, then the Inventor has a Motion analyse. You can solve the equations of motion there, then transfer the forces and constraints to Inventor Simulation Stress Analysis. If this module is not enough for you, you can import loads and constraints from this analysis into the Inventor Nastran.

[eggheadkhan]

thanks for the reply

1. 150mm lever has force applied at end

2. lever rotates in a shaft & drives a cam

3. cam drives spring

4. (force is abruptly removed)

5. spring drives cam into stop at original position

we test to 500,000 cycles mechanically, and below points I would like to improve:

a) the lever connection to the cam

b) the cam connection to the spring

c) the point on the cam that hits the stop

d) the stop

I have various other projects that I could speed up vs mechanical testing with similar concepts - where there is 2+ bodies that depend on what happens to the others to find the force (esp. the force location) on the final bodies...

i was thinking that if I could generate the type of analysis below + including rotating parts like the first video, it would help a lot improving the design.

before I throw a bunch of time of time working out how to do it, I wanted to check it that it was possible...

[viktor_velichko]

Hi! Your last video is very interesting, but it does not apply to your calculations. This is Explicit Dynamics, used for very fast dynamic process. But on this YouTube channel, I found interesting videos that can just be applied to your task.

https://www.youtube.com/watch?v=9ysjy2PNozY&list=PL7889BEC6E2906C2C&index=14

You can also see the book Wasim Younis - Up and Running with Autodesk Inventor Simulation (any edition). This book introduces a dynamic modular inventory and explains how to transfer loads to this analysis in stress analysis Inventor.

The next step you have to take is to go to Configure and click this button

and calculate Multi-Axial Fatigue.

The Ansys for this task uses the same principle - using the module mudule Rigid Dynamic and tranfert to Static straction for calculate stress https://www.youtube.com/watch?v=cGv8m60zN4c

[eggheadkhan]

viktor, thanks for taking time to reply.

i'll check it out.

what I see unique about what I am looking for is that the interaction of the 3rd & 4th item in the chain has unique contact points and forces that are best found by applying the simple force (rotational, etc) at the 1st item in the chain... and I'd like to do manual generative design on every item in that chain...

however, i found on this post, they were heading to where I wanted to go, (see the animation of a piston and crankshaft attached to it)... but it is a work in progress to replicate it at my end...

https://forums.autodesk.com/t5/inventor-nastran-forum/rotational-force-loading-only-for-one-part/m-p...

right now I'm heading down the path of finding someone on upwork to do it for me, as I'm on short on time, and I'll keep plugging on the weekend to see what I can get out of inventor. 

[viktor_velichko]

Ok, I can try to do this. Send me a description of the problem in a private message.