The sway bar must move freely with the suspension in pitch the road springs alone support the weight of the car and the sway bar provides additional roll stiffness when required.
Anti roll bar design calculation.
Roll motion referred as to the motion in the lateral direction on the y axis during which the vehicle rolls around the central axis of the vehicle.
If you are designing your own anti roll bar or have a relatively simple shape roll bar then it is often more accurate to calculate the bars stiffness.
This means that the rate either needs to be calculated or measured.
Unlike coil springs anti roll bars very rarely have the spring rate marked on them.
We must now use installation ratios and anti roll bar contribution rate to calculate the actual spring rate of the part that will be bolted to the car in the form of coil springs and anti roll bars.
The formula is a general attempt to compute the spring rate of the sway bar.
The effects of anti roll bar design parameters on final anti roll bar properties are also evaluated by performing sample analyses with the automated design program developed in this study.
Lowering the anti roll bar setting will increase body roll and higher settings will decrease body roll.
Look at the suspension telemetry screen.
Anti roll bar sometime also known as a stabilizer bar or sway bar is used for the purpose of controlling the roll motion of the vehicle.
The original formula is from fred puhn s book on handling called how to make your car handle.
And a sway bar motion ratio of 0 8333 this number squared is 0 6944 we calculate the sway bar rate at the end of the arm to be 300 0.
For the anti roll bar we need to know the installation ratio in terms of anti roll bar twist per degree of chassis roll.
It will calculate the spring rate for solid and hallow sway bars.
It provides better stability during corning.
If the bar is filling up completely while the suspension is loaded down mid corner you need more roll stiffness and increasing the arb settings is one way to do that.
If we have a sway bar wheel rate of 300 lb in.
This can be used for comparison of.
