symmetric plate size with load in the center and side supports

[lormus]

Good evening, I'm lorenzo, mechanical engineering student.
They entrusted me as a university project the realization of an electric wheelchair and I and my comrades have burst into a solution that provides a base plate on which it supports the seat through a rod and the plate that supports the ground by means of the 4 wheels.
We thought we could make simplifications in the sizing of the plate, but we were told we could not do it. We are now too far ahead with the project to make a change of direction and after a revision with the prof we did not come to any clarification about the sizing of this plate, nor so much less we know from where to start. I kindly ask you to illustrate the main road and tell us how to move. the problem should be simple, it is very symmetric. I'll attach you photos of the plate, thanks a lot of guys!

 

[volaff]

a fem analysis? !

 

[lormus]

I would need an analytical method if possible, we have faced little of the fem analysis at the moment and I would risk not knowing how to imprint or do something risky, in case I accept advice also for an analysis.

 

[meccanicamg]

is a rectangular plate resting on four points that are supports.
you need to look for the theory of slabs on a good book and find the case with the right solution already calculated.
I believe that on the roark's formulas for stress and strain there can be the solution.

 

[meccanicamg]

Why don't we move this discussion to students? What's with the 3d?

Anyway, I'm setting you up the two conditions you can bring back your system.and the alternative if the load is on a partial area....the butt compared to the base for example.

 

[meccanicamg]

Good evening, I'm lorenzo, mechanical engineering student.
They entrusted me as a university project the realization of an electric wheelchair and I and my comrades have burst into a solution that provides a base plate on which it supports the seat through a rod and the plate that supports the ground by means of the 4 wheels.
We thought we could make simplifications in the sizing of the plate, but we were told we could not do it. We are now too far ahead with the project to make a change of direction and after a revision with the prof we did not come to any clarification about the sizing of this plate, nor so much less we know from where to start. I kindly ask you to illustrate the main road and tell us how to move. the problem should be simple, it is very symmetric. I'll attach you photos of the plate, thanks a lot of guys!

I am pleased that university teachers are not able to give explanations to their students....and so that they are paid by your attendance fees.

I do not want the medal, but one day I would like the institutions to notice the work that this forum does, the professionals who devote here, free of charge, to the spread of knowledge and try to bridge what other sources prepared do not provide.

 

[giando.f]

I recommend the student to consult the following volume:
science of construction - volume 3° - (page 75 onwards we talk about the topic)
author: odone belluzzi
publishing house: zanichelli