4 Replies Latest reply on Aug 12, 2016 7:36 AM by Gianluca Mattaroccia

How can I do a motion analysis of a 4wheeled device?

Joana Alves Aug 11, 2016 7:53 AM

Hi!

I am having troubles with the motion analysis of a 4wheeled device. I put a rotary motor on one of the wheels (all the wheels are solidary with each other). But it seems I cannot make it right, I don't know what I am doing wrong.

Also, I wanted to know if it is possible in this analysis to evaluate the velocities, accelerations as a force is applied to the device (in a way it can be seen in the figure in attachment). Or, as well, the stress in the material through the movement of the device.

The device was made in SW 2016, SP0. I put it attached.

Thanks for all the help!

Walker.7z.zip 1.0 MB

Re: How can I do a motion analysis of a 4wheeled device?

Gianluca Mattaroccia Aug 11, 2016 9:13 AM (in response to Joana Alves)

Joana,

you may want to make sure your wheel can actually roll onto a plane and not just spin in free air.
I will look into you model and see what can be done.

Gianluca
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Re: How can I do a motion analysis of a 4wheeled device?

Gianluca Mattaroccia Aug 11, 2016 10:44 AM (in response to Joana Alves)
Hi Joana,
I was able to make a simulation out of your model. You had several mating issues that I corrected as you can see in the file.
I did add a motor and the forces as you were looking to. Please make sure the parameters in your simulations are correct, I did not spend enough time in actually setting the simulation for real results. I only wanted to make sure you could simulate the assy.

Let me know

Gianluca

Walker_GM.zip 2.3 MB
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- Re: How can I do a motion analysis of a 4wheeled device?
  
  Joana Alves Aug 11, 2016 1:43 PM (in response to Gianluca Mattaroccia)
  
  Hi Gianluca,
  
  many thanks for your reply and your help. Yes, I will now correct the parameters in my simulations.
  I take the opportunity to ask if there is a way to study the consequence of those two forces in the velocity of the device? Also, can I do a simulation for the stresses (in the parts) in parallel with the motion analysis?
  
  Once again, thanks.
  Joana
  
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  - Re: How can I do a motion analysis of a 4wheeled device?
    
    Gianluca Mattaroccia Aug 12, 2016 7:36 AM (in response to Joana Alves)
    
    Hi Joana, it depends what type of parameters you will assign to your motor. You will need to define a Torque setting (acceleration and speed) and evaluate the max speed the cart will reach. But to get numbers that have meanings you will need to take into account, friction bearings in your bushings and between ground and wheels.
    
    Of course you can evaluate the stresses importing the reaction forces and bearing loading from Motion to Simulation.
    Make sure you take care of any redundancy in your mates otherwise all you do is worthless.
    Good luck
    
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