Anti Roll Bar Design Calculation

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.

Anti roll bar design calculation. It provides better stability during corning. Look at the suspension telemetry screen. 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 original formula is from fred puhn s book on handling called how to make your car handle.

Unlike coil springs anti roll bars very rarely have the spring rate marked on them. If we have a sway bar wheel rate of 300 lb in. 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. This means that the rate either needs to be calculated or measured.

Lowering the anti roll bar setting will increase body roll and higher settings will decrease body roll. The formula is a general attempt to compute the spring rate of the sway bar. 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. It will calculate the spring rate for solid and hallow sway bars.

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. 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. 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. This simple calculator will help do that for solid and hollow sway bars.

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. Or anti roll bar is a spring connected between the left and right side of the car whose role as suggested by its name is to resist rolling of the suspension.