analysis fem bicycle frame: some straight...

[gregario]

Hi.

I am helping a friend realize the design of a 3d racing bicycle frame using solidworks.

I don't normally design these things, but power transmission organs, so since I do work a little 'lost time' I don't know where to recover various material.

for solid modeling at the moment, solved some needles in fitting with various solid surfaces, it seems that the design of the frame is taking shape.. .

I wanted to take a step further for personal culture, since it is not my field, but "learn art and put it aside." . .

I wanted to check through the calculation of finite elements some critical sections, but I have nothing that can quantify the loads agents in certain sections and how they act... .
online there is nothing, norms uni-en are paid. . .

Any advice on that?

every little help is well accepted..........

hello and thank you in advance for your answers

 

[sampom]

Hi.

I am helping a friend realize the design of a 3d racing bicycle frame using solidworks.

I don't normally design these things, but power transmission organs, so since I do work a little 'lost time' I don't know where to recover various material.

for solid modeling at the moment, solved some needles in fitting with various solid surfaces, it seems that the design of the frame is taking shape.. .

I wanted to take a step further for personal culture, since it is not my field, but "learn art and put it aside." . .



I wanted to check through the calculation of finite elements some critical sections, but I have nothing that can quantify the loads agents in certain sections and how they act... .
online there is nothing, norms uni-en are paid. . .

Any advice on that?

every little help is well accepted..........

hello and thank you in advance for your answers

Hello greg..

I invite you to refer to the debates with titles which have a clear reference to the subject.

Imagine you have to do a search for keywords, what could you look for?some straight? What about?

even to be able to answer, one from the summary knows already where to go without having to open all threads at home.

Thank you.

greetings
Mar

p.s. a part that everything is explained in the regulation:mixed:

 

[Oldwarper]

I suggest you go to the forum We do or in the specific cosmos (now solidworks simulation). in addition to recommendations on the program you will also have answers on the correct methodologies of calculation and analysis.

 

[ezioceres]

Hi. Maybe a little bit I can help you. .
if you are interested you could try to do the tests that are typically made on the motorcycle frames to verify stiffness, resistance and fatigue.

stiffness tests aim to assess how rigid the frame is torsionqally and flexionally. in practice binds the back to the ground, and by means of rigid elements connected to the steer canoe, or pulls (flexional test) or twists (prova torsionale).

for resistance tests are assessed critical conditions: Ingenre this you have with a force placed in the point of contact wheel-soil in landing from frog (force z and x)

fatigue tests are a bit complex to explain with two words. .
Hi.

 

[Matteo]

Hi, I'm studying a cycling dynamic problem: short (1 or 2 weeks) I will put some results on the company website ( http://www.caedevice.net/bicicletta/index.php ). consider that the problem of loads acting on a bicycle is not simple: I suggest you start with clear ideas on the conditions to simulate (pedaled with pedivella in a position of maximum push, pedaled outpost, "ride" i.e. sliding on the road). also the simulation of stiffness and kinematics of the circles and tires is not trivial.

the speech is much simpler if reduced to a static evaluation, as indicative, and a quick comparison with "competition".

as already done by the other mods I place the fem section as more appropriate. cad level I am using a parameter similar to swx (in my case proe wf4) for the study of the frame (the parameterity I need to manage the simulation of the different sizes and the dimensions of the tubes, modeled as surfaces) and an explicit (spaceclaim) for the modeling of the accessories (paediles, handlebar attachment).

 

[gregario]

Hi, I'm studying a cycling dynamic problem: short (1 or 2 weeks) I will put some results on the company website ( http://www.caedevice.net/bicicletta/index.php ). consider that the problem of loads acting on a bicycle is not simple: I suggest you start with clear ideas on the conditions to simulate (pedaled with pedivella in a position of maximum push, pedaled outpost, "ride" i.e. sliding on the road). also the simulation of stiffness and kinematics of the circles and tires is not trivial.

the speech is much simpler if reduced to a static evaluation, as indicative, and a quick comparison with "competition".

as already done by the other mods I place the fem section as more appropriate. cad level I am using a parameter similar to swx (in my case proe wf4) for the study of the frame (the parameterity I need to manage the simulation of the different sizes and the dimensions of the tubes, modeled as surfaces) and an explicit (spaceclaim) for the modeling of the accessories (paediles, handlebar attachment).

My problem is also to quantify the type of load... .
that loads attribute to the various ways of pedaling?
Does the weight of the cyclist affect? What percentage?
how do you distribute your weight on the frame?

Maybe I want to do something bigger than me....

 

[Matteo]

the weight counts a lot! an average cyclist weighs 6 times the bicycle, mostly "supported" at the saddle, with a cyclic discharge on the pedals (about 50%).

for pedaling: make a pattern of the kinematic chain (pedal, pedivella, chain crown, pinion, hub, circles) and consider that normally the maximum thrust (which varies from 100n to 1000n in relation to the type of pedal and cyclist) is realized when the pedivella is oriented forward and about horizontal.

Maybe I want to do something bigger than me...

Do things calmly... it takes months to avoid such a problem

 

[gregario]

the weight counts a lot! an average cyclist weighs 6 times the bicycle, mostly "supported" at the saddle, with a cyclic discharge on the pedals (about 50%).

for pedaling: make a pattern of the kinematic chain (pedal, pedivella, chain crown, pinion, hub, circles) and consider that normally the maximum thrust (which varies from 100n to 1000n in relation to the type of pedal and cyclist) is realized when the pedivella is oriented forward and about horizontal.



Do things calmly... it takes months to avoid such a problem

lovely advice!!! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

If you don't get upset about other delucidations and on other occasions, can I contact you for mp?

hello and good day

b)