Hub forces

[Jepeto]

Hi,

I have searched the answer to my question in the forum but I havent found it.

Im just looking for the forces that the hub will support during the trials.

My team has given me 3 forces. The one that the floor does against the tyre upwards (1700 N), the friction between the tyre and the ground (3500 N) and the cornering force (4000 N).

1- What does your experience say about that forces? are realistic? We have estimate a weight of 280 kg with the driver.

Other point is how to apply this forces to the hub. Im using Ansys Workbench with remote forces applied to the bolt holes of the rim from the simulated ground (0.26 cm below the hub axle).
I attach the picture. <http://img836.imageshack.us/img836/1074/previewev.png (http://imageshack.us/photo/my-images/836/previewev.png/)

Uploaded with ImageShack.us (http://imageshack.us)

2- The hub is fixed on the bearing, the force is on the ground in the X axis and is applied on the bolts.

In your opinion, is ok?

Thanks!!

[Jepeto]

Hi,

I have searched the answer to my question in the forum but I havent found it.

Im just looking for the forces that the hub will support during the trials.

My team has given me 3 forces. The one that the floor does against the tyre upwards (1700 N), the friction between the tyre and the ground (3500 N) and the cornering force (4000 N).

1- What does your experience say about that forces? are realistic? We have estimate a weight of 280 kg with the driver.

Other point is how to apply this forces to the hub. Im using Ansys Workbench with remote forces applied to the bolt holes of the rim from the simulated ground (0.26 cm below the hub axle).
I attach the picture. &lt;http://img836.imageshack.us/img836/1074/previewev.png (http://imageshack.us/photo/my-images/836/previewev.png/)

Uploaded with ImageShack.us (http://imageshack.us)

2- The hub is fixed on the bearing, the force is on the ground in the X axis and is applied on the bolts.

In your opinion, is ok?

Thanks!!

[Bemo]

According to the results you will get, you should remove the attachements for the brake disc as they don't take any load. Think about it...

[Jepeto]

So, I should attach the force in the brake disc attachements?

[rmk36]

Every action has a reaction. The forces on your car are generated by the tires. Your bearings react forces, but does a bearing react torque?

In short, you have multiple loading scenarios which require different fixture scenarios. Think about the different types of forces/moments you will see and how they will reacted in your hub assembly.

[wagemd]

Bemo, I like how you phrased that... Make 'em think!

[Jepeto]

Leaving the misteries aside, could anybody tell me if the forces are realistic? I mean, do the forces fit with the ones you had from your own cars?

Maybe its a top secret, but aprox?

[Chapo]

In short, yes, the forces are similar in magnitude to the ones on MY car. However for your car they may be completely off.

To calculate these forces there are some very simple calculations that you can do and all you need is the:

Vehicle mass
Centre of gravity height
Wheel Base
Track
Wheel radius and effective brake disc radius
Expected load cases (lateral, longitudinal and vertical acceleration)
Safety factors

With those figures and a simple free body diagram or two you can calculate your weight transfer and the appropriate forces that will be experienced by the car (brake reaction forces, acceleration forces etc).

I suggest you work this information out for yourself as it is extremely important for the safety of your driver and other people that may be around the car when it is running.
Additionally this kind of thing is exactly what the FSAE project is about so I am not going to give you the answer, some simple google searches may help you though.