Need source for tire stiffness data

[wesman33]

Hello,
I need some help finding a reference-able source for tire stiffness / spring rate data.

We are evaluating the affect of seismic loading on a multi-wheeled transporter. (e.g. Goldhofer SPMT) The transporter has multiple 215 / 75 R17.5 tires mounted to vertically mounted hydraulic cylinders. Tire pressure is typically 150 psig.

For our analysis case, we are considering the hydraulic cylinders as locked (rigid links), and the tires would be the only appreciably flexible link in the system. The question is: how flexible?

Any help would be greatly appreciated.

 

[GregLocock]

Try loading the vehicle up and measuring the change in axle weight and sidewall height.

Alternatively ask the tire manufacturer.

Alternatively you may be able to find a chart of wheel load and rolling radius.

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[wesman33]

Thanks for the quick response.

I can't do a), because I don't have access to the vehicle until next year (rental).

I guess it's time to start working the phones at the tire manufacturer.

Thanks again.

-wah

 

[GregLocock]

Yeah, you'd think it was an industrial secret or something. I can assure you that any reputable tire manufacturer has the info.

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.