How do you calculate vertical stiffness on a tyre?

Non-rolling vertical stiffness was determined with two methods. One method measured the rate of decay of free oscillation by dropping the tire from a known height and regressing the vertical position versus time data. The second method used the equilibrium load-deflection data from each free vibration test.

Where is the tyre load rating?

You’ll find the load rating of your tyre on the sidewall, just to the right of the diameter. For example, a tyre with a load index of 91 can carry 615kg of weight. Load ratings and speed ratings should be looked at together when you buy a new tyre. Also remember to check your manufacturer’s recommendations.

What is the normal force of a tire?

So you would divide the total mass by 4 since there are 4 wheels. This gives you the mass on each tire. Multiply that mass by the acceleration due to gravity which is 9.81m/s^2. This result is the normal force on each car wheels.

How much force can a tire take?

There is a maximum pressure stamped on the sidewall of all passenger car tires listing the maximum safe cold pressure, its usually around 52 PSI so you are safe. At 150°F the temperature your tire might hit due to road temps and friction the pressure will increase to 39 PSI. These are the pressure laws of physics.

What is vertical stiffness?

Vertical stiffness (kvert) is a measure of system/whole body stiffness and is equal to maximum vertical ground reaction force (Fmax) divided by change in whole body centre of mass (ΔCOM).

What is stiffness of tire?

Cornering stiffness of a tire is its ability to resist deformation in the shape of a tire while the vehicle corners. The more flexible the tire is the less stiffer it is. When a vehicle is moving at high speed, lateral force acting on tires increases the possibility for vehicle to get into a critical situation.

What is lateral load?

Lateral loading is the continuous and repeated application of a load on an object or structural component in a horizontal direction or parallel to the x-axis. Lateral loading can cause a material to shear or bend in the direction of the force and ultimately lead to the failure of the material.

What is tire lateral force?

The lateral deflection taking place in the tyres gives rise to an elastic force. This force, called cornering force or lateral force is perpendicular to the direction the wheel is pointing and happens in the center of the tyre contact patch. As the slip angle increases, some sliding begins to occur in the tyre tread.

How do I find my load rating?

To roughly determine the load range capacity for each individual tire, take the vehicle’s gross weight and divide by four. If the vehicle gross weight is 4,500 pounds, each tire should be able to safely support at least 1,125 pounds.

How do you read a tire load rating?

The higher the tire’s load index number, the greater its load carrying capacity. A tire with a higher load index than that of the Original Equipment tire indicates an increase in load capacity. A tire with a load index equal to that of the Original Equipment tire indicates an equivalent load capacity.