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Roll Rate or Roll stiffness is the resistance moment generated per unit of roll angle of the sprung mass. Check FAQs
KΦ=KttR22(Rarb+KwTs22)KttR22+Rarb+KwTs22
KΦ - Roll Rate?Kt - Tyre Vertical Rate?tR - Rear Track Width?Rarb - Roll Rate of Anti-Roll Bar?Kw - Wheel Centre Rate?Ts - Spring Track Width?

Roll Rate with Anti-Roll Bar Example

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With units
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Here is how the Roll Rate with Anti-Roll Bar equation looks like with Values.

Here is how the Roll Rate with Anti-Roll Bar equation looks like with Units.

Here is how the Roll Rate with Anti-Roll Bar equation looks like.

10297.4296Edit=321300Edit0.4Edit22(4881.6Edit+30366.46Edit0.9Edit22)321300Edit0.4Edit22+4881.6Edit+30366.46Edit0.9Edit22
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Roll Rate with Anti-Roll Bar Solution

Follow our step by step solution on how to calculate Roll Rate with Anti-Roll Bar?

FIRST Step Consider the formula
KΦ=KttR22(Rarb+KwTs22)KttR22+Rarb+KwTs22
Next Step Substitute values of Variables
KΦ=321300N/m0.4m22(4881.6Nm/rad+30366.46N/m0.9m22)321300N/m0.4m22+4881.6Nm/rad+30366.46N/m0.9m22
Next Step Prepare to Evaluate
KΦ=3213000.422(4881.6+30366.460.922)3213000.422+4881.6+30366.460.922
Next Step Evaluate
KΦ=10297.4296037473Nm/rad
LAST Step Rounding Answer
KΦ=10297.4296Nm/rad

Roll Rate with Anti-Roll Bar Formula Elements

Variables
Roll Rate
Roll Rate or Roll stiffness is the resistance moment generated per unit of roll angle of the sprung mass.
Symbol: KΦ
Measurement: Torsion ConstantUnit: Nm/rad
Note: Value should be greater than 0.
Tyre Vertical Rate
Tyre Vertical Rate is the spring rate controlled by the tyre compound, sidewall stiffness and operating pressure.
Symbol: Kt
Measurement: Surface TensionUnit: N/m
Note: Value should be greater than 0.
Rear Track Width
Rear Track Width is the distance between the centers of the rear wheels.
Symbol: tR
Measurement: LengthUnit: m
Note: Value should be greater than 0.
Roll Rate of Anti-Roll Bar
The Roll Rate of Anti-Roll Bar is the stiffness of the anti-roll bar in the roll mode.
Symbol: Rarb
Measurement: Torsion ConstantUnit: Nm/rad
Note: Value should be greater than 0.
Wheel Centre Rate
Wheel Centre Rate is the vertical force acting on the tire per unit vertical displacement at the location along the spindle corresponding to the wheel centerline, measured relative to the chassis.
Symbol: Kw
Measurement: Surface TensionUnit: N/m
Note: Value should be greater than 0.
Spring Track Width
Spring Track Width is the distance between the springs on either side of the axle.
Symbol: Ts
Measurement: LengthUnit: m
Note: Value should be greater than 0.

Other Formulas to find Roll Rate

​Go Roll Rate
KΦ=KttR22KwTs22KttR22+KwTs22

Other formulas in Rates for Axle Suspension in Race Car category

​Go Vertical Tyre Axle Rate given Roll Rate
Kw=KΦKttR22KttR22-KΦTs22
​Go Spring Track Width given Roll Rate
Ts=KΦKttR2(KttR22-KΦ)Kw
​Go Tyre Rate given Roll Rate
Kt=KΦ(KwTs22)(KwTs22-KΦ)tR22
​Go Rear Track Width given Roll Rate
tR=KΦKwTs2(KwTs22-KΦ)Kt

How to Evaluate Roll Rate with Anti-Roll Bar?

Roll Rate with Anti-Roll Bar evaluator uses Roll Rate = (Tyre Vertical Rate*(Rear Track Width^2)/2*(Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2))/(Tyre Vertical Rate*(Rear Track Width^2)/2+Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2) to evaluate the Roll Rate, The Roll rate with Anti-roll bar formula used to find the stiffness of the car with an axle suspension and anti-roll bar in the roll mode. Roll Rate is denoted by KΦ symbol.

How to evaluate Roll Rate with Anti-Roll Bar using this online evaluator? To use this online evaluator for Roll Rate with Anti-Roll Bar, enter Tyre Vertical Rate (Kt), Rear Track Width (tR), Roll Rate of Anti-Roll Bar (Rarb), Wheel Centre Rate (Kw) & Spring Track Width (Ts) and hit the calculate button.

FAQs on Roll Rate with Anti-Roll Bar

What is the formula to find Roll Rate with Anti-Roll Bar?
The formula of Roll Rate with Anti-Roll Bar is expressed as Roll Rate = (Tyre Vertical Rate*(Rear Track Width^2)/2*(Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2))/(Tyre Vertical Rate*(Rear Track Width^2)/2+Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2). Here is an example- 10297.43 = (321300*(0.4^2)/2*(4881.6+30366.46*(0.9^2)/2))/(321300*(0.4^2)/2+4881.6+30366.46*(0.9^2)/2).
How to calculate Roll Rate with Anti-Roll Bar?
With Tyre Vertical Rate (Kt), Rear Track Width (tR), Roll Rate of Anti-Roll Bar (Rarb), Wheel Centre Rate (Kw) & Spring Track Width (Ts) we can find Roll Rate with Anti-Roll Bar using the formula - Roll Rate = (Tyre Vertical Rate*(Rear Track Width^2)/2*(Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2))/(Tyre Vertical Rate*(Rear Track Width^2)/2+Roll Rate of Anti-Roll Bar+Wheel Centre Rate*(Spring Track Width^2)/2).
What are the other ways to Calculate Roll Rate?
Here are the different ways to Calculate Roll Rate-
  • Roll Rate=(Tyre Vertical Rate*(Rear Track Width^2)/2*Wheel Centre Rate*(Spring Track Width^2)/2)/(Tyre Vertical Rate*Rear Track Width^2/2+Wheel Centre Rate*Spring Track Width^2/2)OpenImg
Can the Roll Rate with Anti-Roll Bar be negative?
No, the Roll Rate with Anti-Roll Bar, measured in Torsion Constant cannot be negative.
Which unit is used to measure Roll Rate with Anti-Roll Bar?
Roll Rate with Anti-Roll Bar is usually measured using the Newton Meter per Radian[Nm/rad] for Torsion Constant. Newton Centimeter per Radian[Nm/rad] are the few other units in which Roll Rate with Anti-Roll Bar can be measured.
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