Front View Swing Arm: Difference between revisions
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[[File:Annotation 2025-07-15 103433.png|thumb|406x406px|Example of FVSA]] | [[File:Annotation 2025-07-15 103433.png|thumb|406x406px|Example of FVSA]] | ||
Front View Swing Arm (FVSA) is a theoretical line between the center of the upright to the FVSA instant center. The FVSA instant center is determined by the upper and lower control arm's geometry. FVSA determines camber gain, tire lateral scrub rate, and roll center height. | Front View Swing Arm (FVSA) is a theoretical line between the center of the upright to the FVSA instant center. The FVSA instant center is determined by the upper and lower control arm's geometry and current ride height. FVSA determines camber gain, tire lateral scrub rate, and roll center height. The '''FVSA instant center moves with ride height change.''' Thus, it will change over the course of a drive. | ||
== Camber Curves == | == Camber Curves == | ||
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(add the math) | (add the math) | ||
== Roll Center == | |||
[[File:Annotation 2025-07-15 134306.png|thumb|397x397px|Example of a roll center]] | |||
Using the FVSA, the roll center can be found. First find the FVSA of each wheel. Then, create a line from each instant center to its respective wheel's contact patch. The point where these 2 lines intersect is the car's roll center at that ride height. The roll center height is used to calculate the roll moment of the vehicle. | |||
The roll center is used to calculate the change in vertical tire load due to link [[load transfer]]. It is also used to calculate the change in vertical tire load due to the roll stiffness load transfer (elastic load transfer). | |||
Latest revision as of 11:56, 31 July 2025
Front View Swing Arm (FVSA) is a theoretical line between the center of the upright to the FVSA instant center. The FVSA instant center is determined by the upper and lower control arm's geometry and current ride height. FVSA determines camber gain, tire lateral scrub rate, and roll center height. The FVSA instant center moves with ride height change. Thus, it will change over the course of a drive.
Camber Curves[edit | edit source]
As the wheel travels, the instant center changes due to the outer control arms position changing. By changing the control arm's geometry, the wheels camber can change at different rates throughout its travel.
(add the math)
Roll Center[edit | edit source]
Using the FVSA, the roll center can be found. First find the FVSA of each wheel. Then, create a line from each instant center to its respective wheel's contact patch. The point where these 2 lines intersect is the car's roll center at that ride height. The roll center height is used to calculate the roll moment of the vehicle.
The roll center is used to calculate the change in vertical tire load due to link load transfer. It is also used to calculate the change in vertical tire load due to the roll stiffness load transfer (elastic load transfer).
