Assumed Initial Roll Rate given Required Anti-Roll Bar Rate Formula

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The Assumed Initial Roll Rate is the initial spring rate of the anti-roll bar assumed before calculating the required anti-roll bar rate. Check FAQs
KΦ=(Ka+Kwa22)Kta22Kta22+Ka+Kwa22
KΦ - Assumed Initial Roll Rate?Ka - Required Anti Roll Bar Rate?Kw - Wheel Centre Rate?a - Track Width of Vehicle?Kt - Tyre Vertical Rate?

Assumed Initial Roll Rate given Required Anti-Roll Bar Rate Example

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

Here is how the Assumed Initial Roll Rate given Required Anti-Roll Bar Rate equation looks like with Units.

Here is how the Assumed Initial Roll Rate given Required Anti-Roll Bar Rate equation looks like.

76693.2625Edit=(89351Edit+35239Edit1.2Edit22)321330Edit1.2Edit22321330Edit1.2Edit22+89351Edit+35239Edit1.2Edit22
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Assumed Initial Roll Rate given Required Anti-Roll Bar Rate Solution

Follow our step by step solution on how to calculate Assumed Initial Roll Rate given Required Anti-Roll Bar Rate?

FIRST Step Consider the formula
KΦ=(Ka+Kwa22)Kta22Kta22+Ka+Kwa22
Next Step Substitute values of Variables
KΦ=(89351Nm/rad+35239N/m1.2m22)321330N/m1.2m22321330N/m1.2m22+89351Nm/rad+35239N/m1.2m22
Next Step Prepare to Evaluate
KΦ=(89351+352391.222)3213301.2223213301.222+89351+352391.222
Next Step Evaluate
KΦ=76693.2625462017Nm/rad
LAST Step Rounding Answer
KΦ=76693.2625Nm/rad

Assumed Initial Roll Rate given Required Anti-Roll Bar Rate Formula Elements

Variables
Assumed Initial Roll Rate
The Assumed Initial Roll Rate is the initial spring rate of the anti-roll bar assumed before calculating the required anti-roll bar rate.
Symbol: KΦ
Measurement: Torsion ConstantUnit: Nm/rad
Note: Value should be greater than 0.
Required Anti Roll Bar Rate
Required Anti Roll Bar Rate is the required amount of spring rate of the roll bar for the system.
Symbol: Ka
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.
Track Width of Vehicle
Track Width of Vehicle is the distance between the center line of each of the two wheels on the same axle (front/rear axle).
Symbol: a
Measurement: LengthUnit: m
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.

Other formulas in Wheel Centre Rates for Independent Suspension category

​Go Required Anti-Roll Bar Rate
Ka=KΦKta22Kta22-KΦ-Kwa22
​Go Wheel Centre Rate given Required Anti-Roll Bar Rate
Kw=KΦKta22Kta22-KΦ-Kaa22
​Go Tyre Rate given Required Anti-Roll Bar Rate
Kt=((Ka+Kwa22)KΦ(Ka+Kwa22)-KΦ)2a2
​Go Wheel Centre Rate
Kw=KrKtKt-Kr

How to Evaluate Assumed Initial Roll Rate given Required Anti-Roll Bar Rate?

Assumed Initial Roll Rate given Required Anti-Roll Bar Rate evaluator uses Assumed Initial Roll Rate = (Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2)*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2+Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2) to evaluate the Assumed Initial Roll Rate, The Assumed initial roll rate given required anti-roll bar rate formula is used to find the initially assumed spring rate of the anti-roll bar which would be used to find the required anti-roll bar rate of the system considered. Assumed Initial Roll Rate is denoted by KΦ symbol.

How to evaluate Assumed Initial Roll Rate given Required Anti-Roll Bar Rate using this online evaluator? To use this online evaluator for Assumed Initial Roll Rate given Required Anti-Roll Bar Rate, enter Required Anti Roll Bar Rate (Ka), Wheel Centre Rate (Kw), Track Width of Vehicle (a) & Tyre Vertical Rate (Kt) and hit the calculate button.

FAQs on Assumed Initial Roll Rate given Required Anti-Roll Bar Rate

What is the formula to find Assumed Initial Roll Rate given Required Anti-Roll Bar Rate?
The formula of Assumed Initial Roll Rate given Required Anti-Roll Bar Rate is expressed as Assumed Initial Roll Rate = (Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2)*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2+Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2). Here is an example- 76693.26 = (89351+35239*(1.2^2)/2)*(321330*(1.2^2)/2)/(321330*(1.2^2)/2+89351+35239*(1.2^2)/2).
How to calculate Assumed Initial Roll Rate given Required Anti-Roll Bar Rate?
With Required Anti Roll Bar Rate (Ka), Wheel Centre Rate (Kw), Track Width of Vehicle (a) & Tyre Vertical Rate (Kt) we can find Assumed Initial Roll Rate given Required Anti-Roll Bar Rate using the formula - Assumed Initial Roll Rate = (Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2)*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2+Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2).
Can the Assumed Initial Roll Rate given Required Anti-Roll Bar Rate be negative?
No, the Assumed Initial Roll Rate given Required Anti-Roll Bar Rate, measured in Torsion Constant cannot be negative.
Which unit is used to measure Assumed Initial Roll Rate given Required Anti-Roll Bar Rate?
Assumed Initial Roll Rate given Required Anti-Roll Bar Rate 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 Assumed Initial Roll Rate given Required Anti-Roll Bar Rate can be measured.
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