Required Anti-Roll Bar Rate Calculator

✖The Assumed Initial Roll Rate is the initial spring rate of the anti-roll bar assumed before calculating the required anti-roll bar rate.ⓘ Assumed Initial Roll Rate [K_Φ]			+10% -10%
✖Tyre Vertical Rate is the spring rate controlled by the tyre compound, sidewall stiffness and operating pressure.ⓘ Tyre Vertical Rate [K_t]			+10% -10%
✖Track Width of Vehicle is the distance between the center line of each of the two wheels on the same axle (front/rear axle).ⓘ Track Width of Vehicle [a]			+10% -10%
✖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.ⓘ Wheel Centre Rate [K_w]			+10% -10%

✖Required Anti Roll Bar Rate is the required amount of spring rate of the roll bar for the system.ⓘ Required Anti-Roll Bar Rate [K_a]

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Required Anti-Roll Bar Rate Solution

STEP 0: Pre-Calculation Summary

Formula Used

Required Anti Roll Bar Rate = Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Wheel Centre Rate*(Track Width of Vehicle^2)/2
K_a = K_Φ*(K_t*(a^2)/2)/(K_t*(a^2)/2-K_Φ)-K_w*(a^2)/2
This formula uses 5 Variables

Variables Used

Required Anti Roll Bar Rate - (Measured in Newton Meter per Radian) - Required Anti Roll Bar Rate is the required amount of spring rate of the roll bar for the system.
Assumed Initial Roll Rate - (Measured in Newton Meter per Radian) - The Assumed Initial Roll Rate is the initial spring rate of the anti-roll bar assumed before calculating the required anti-roll bar rate.
Tyre Vertical Rate - (Measured in Newton per Meter) - Tyre Vertical Rate is the spring rate controlled by the tyre compound, sidewall stiffness and operating pressure.
Track Width of Vehicle - (Measured in Meter) - Track Width of Vehicle is the distance between the center line of each of the two wheels on the same axle (front/rear axle).
Wheel Centre Rate - (Measured in Newton per Meter) - 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.

STEP 1: Convert Input(s) to Base Unit

Assumed Initial Roll Rate: 76693 Newton Meter per Radian --> 76693 Newton Meter per Radian No Conversion Required
Tyre Vertical Rate: 321330 Newton per Meter --> 321330 Newton per Meter No Conversion Required
Track Width of Vehicle: 1.2 Meter --> 1.2 Meter No Conversion Required
Wheel Centre Rate: 35239 Newton per Meter --> 35239 Newton per Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

K_a = K_Φ*(K_t*(a^2)/2)/(K_t*(a^2)/2-K_Φ)-K_w*(a^2)/2 --> 76693*(321330*(1.2^2)/2)/(321330*(1.2^2)/2-76693)-35239*(1.2^2)/2

Evaluating ... ...

K_a = 89350.4125212363

STEP 3: Convert Result to Output's Unit

89350.4125212363 Newton Meter per Radian --> No Conversion Required

FINAL ANSWER

89350.4125212363 ≈ 89350.41 Newton Meter per Radian <-- Required Anti Roll Bar Rate

(Calculation completed in 00.004 seconds)

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National Institute of Technology Calicut (NIT Calicut), Calicut, Kerala

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< Wheel Centre Rates for Independent Suspension Calculators

Assumed Initial Roll Rate given Required Anti-Roll Bar Rate

LaTeX Go 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)

Tyre Rate given Required Anti-Roll Bar Rate

LaTeX Go Tyre Vertical Rate = (((Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2)*Assumed Initial Roll Rate)/((Required Anti Roll Bar Rate+Wheel Centre Rate*(Track Width of Vehicle^2)/2)-Assumed Initial Roll Rate))*2/Track Width of Vehicle^2

Wheel Centre Rate given Required Anti-Roll Bar Rate

LaTeX Go Wheel Centre Rate = (Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Required Anti Roll Bar Rate)/((Track Width of Vehicle^2)/2)

Required Anti-Roll Bar Rate

LaTeX Go Required Anti Roll Bar Rate = Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Wheel Centre Rate*(Track Width of Vehicle^2)/2

Required Anti-Roll Bar Rate Formula

LaTeX Go

What are the main functions of anti-roll bar?

The first function is the reduction of body lean which is dependent on the total roll stiffness of the vehicle. Increasing which does not change the steady-state total load (weight) transfer from the inside wheels to the outside wheels, it only reduces body lean. The total lateral load transfer is determined by the CG height and track width. The other function is to tune the handling balance of a car. Understeer or oversteer behaviour can be tuned out by changing the proportion of the total roll stiffness that comes from the front and rear axles. Increasing the proportion of roll stiffness at the front increases the proportion of total load transfer that front axle reacts to—and decreases proportion that rear axle reacts to. In general, this makes outer front wheel run at a comparatively higher slip angle, and outer rear wheel run at a comparatively lower slip angle, which is an understeer effect. Increasing the proportion of roll stiffness at the rear axle has the opposite effect and decreases understeer.

What are the drawbacks of anti-roll bar?

Because an anti-roll bar connects wheels on opposite sides of the vehicle, the bar transmits the force of a bump on one wheel to the opposite wheel. On rough or broken pavement, anti-roll bars can produce jarring, side-to-side body motions (a "waddling" sensation), which increase in severity with the diameter and stiffness of the sway bars. Other suspension techniques can delay or dampen this effect of the connecting bar. Excessive roll stiffness, typically achieved by configuring an anti-roll bar too aggressively, can make the inside wheels lift off the ground during hard cornering. This can be used to advantage: many front-wheel-drive production cars lift a rear wheel when cornering hard in order to overload the opposite wheel, limiting understeer.

How to Calculate Required Anti-Roll Bar Rate?

Required Anti-Roll Bar Rate calculator uses Required Anti Roll Bar Rate = Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Wheel Centre Rate*(Track Width of Vehicle^2)/2 to calculate the Required Anti Roll Bar Rate, The Required Anti-roll bar rate formula is used to find the spring stiffness of the anti-roll bar for the system considered. Required Anti Roll Bar Rate is denoted by K_a symbol.

How to calculate Required Anti-Roll Bar Rate using this online calculator? To use this online calculator for Required Anti-Roll Bar Rate, enter Assumed Initial Roll Rate (K_Φ), Tyre Vertical Rate (K_t), Track Width of Vehicle (a) & Wheel Centre Rate (K_w) and hit the calculate button. Here is how the Required Anti-Roll Bar Rate calculation can be explained with given input values -> 89350.41 = 76693*(321330*(1.2^2)/2)/(321330*(1.2^2)/2-76693)-35239*(1.2^2)/2.

FAQ

What is Required Anti-Roll Bar Rate?

The Required Anti-roll bar rate formula is used to find the spring stiffness of the anti-roll bar for the system considered and is represented as K_a = K_Φ*(K_t*(a^2)/2)/(K_t*(a^2)/2-K_Φ)-K_w*(a^2)/2 or Required Anti Roll Bar Rate = Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Wheel Centre Rate*(Track Width of Vehicle^2)/2. The Assumed Initial Roll Rate is the initial spring rate of the anti-roll bar assumed before calculating the required anti-roll bar rate, Tyre Vertical Rate is the spring rate controlled by the tyre compound, sidewall stiffness and operating pressure, Track Width of Vehicle is the distance between the center line of each of the two wheels on the same axle (front/rear axle) & 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.

How to calculate Required Anti-Roll Bar Rate?

The Required Anti-roll bar rate formula is used to find the spring stiffness of the anti-roll bar for the system considered is calculated using Required Anti Roll Bar Rate = Assumed Initial Roll Rate*(Tyre Vertical Rate*(Track Width of Vehicle^2)/2)/(Tyre Vertical Rate*(Track Width of Vehicle^2)/2-Assumed Initial Roll Rate)-Wheel Centre Rate*(Track Width of Vehicle^2)/2. To calculate Required Anti-Roll Bar Rate, you need Assumed Initial Roll Rate (K_Φ), Tyre Vertical Rate (K_t), Track Width of Vehicle (a) & Wheel Centre Rate (K_w). With our tool, you need to enter the respective value for Assumed Initial Roll Rate, Tyre Vertical Rate, Track Width of Vehicle & Wheel Centre Rate and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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