doubts about frame

[gios90]

Hello, everyone.
I tried to look for the "welcome" section but at a glance I did not find it, also because eager to post pictures and have your consult. I hope the section is the right one.. I ask you to move it to the right area.

I am a student of mechanical ing (early 3rd year), and for an exam they asked us to design an electric bike from scratch, without any base on which to start.

the first doubts begin with the design of the frame, and before making calculations, indeed.. even before opening a book that gives me at least one infarination on the resistance of materials, I first created a sketch of the frame of the bike. it was done considering only the aesthetics all created with solidworks... but I have all the table with the relative quotas of each component (with autocad). what I ask is... starting from this frame.. will I be able to understand if this frame is suitable? Can I get certain data on that type of frame and that kind of material? or perhaps it is better than I operate for a more linear solution, straight lines and with less curves.. .

the design is missing in many of its parts... but the basic idea is what you see.

 

[gios90]

Is no one able to give me a tip?? Well...

 

[peloritano]

but what matter did he ask you?? ? ?

 

[gios90]

It is simply the examination "assisted drawing to the computer" even if the name of the matter has changed, but the path remains the same.

The idea of using curved beams is just my... more than anything for a design factor... all aesthetic question. use solidworks to create rectangular and straight sections seems a little wasted... I just want to know how to study stresses on curved beams.. .

 

[peloritano]

Here.... construction of machines... curved beams are studied in that matter. .
but first it is the case of evaluating the distribution of loads in the various points.. .

 

[gios90]

I tried to search in some book of machine constructions... but they only refer to straight beams at the most tilted... never a minimum example of the forces acting on a curved plane.. So much so I thought of putting myself in a greater range of safety but evaluating those curves as if they were simply inclined beams... I do not think this is allowed in the case of patents.

I could also make a solidworks simulation about the resistance of materials... but a paper approach with calculator would not be bad to complete this project at best.

I have to look for a lot in the library. But if I could get more information, I wouldn't mind.

 

[peloritano]

So... curved beams are a construction topic of machines but you need first to know what loads are on your structure.. .
as I have written you must evaluate the loads that are applied and, starting from these, you have to calculate the forces agents on the knots of your frame (for knots I mean the axis of the bike, the points of attack of the shock and the intersection point of the two rods... this regarding the only part you have drawn). .
for the moment you can consider everything in a plan and to solve this you need the basics of science of buildings.. in construction science for the moment you can replace curved beams with straight rods

 

[gios90]

being a bike I can imagine that the forces applied on the chassis are in correspondence of the saddle (with vertical forces), on the handlebar (I go a bit in confusion with the forces... because being walk then high handlebar.. I can't imagine the forces... almost as if there were...).

a alley is precisely in correspondence of the intersection of the two auctions... and shock absorbers. . .

I have to take some book "serio" and throw down some accounts...

 

[athlon]

in the bikes a point where many forces are discharged is the central movement (pedals)