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Geometric roll center is solely dictated by the suspension geometry, and can be found using principles of the instant center of rotation.; Force based roll center, according to the US Society of Automotive Engineers, is "The point in the transverse vertical plane through any pair of wheel centers at which lateral forces may be applied to the sprung mass without producing suspension roll".
Roll center height at design load; Mechanical (or caster) trail; Anti-dive and anti-squat; Kingpin Inclination; Scrub radius; Spring and shock absorber motion ratios; The kinematics describe how important characteristics change as the suspension moves, typically in roll or steer. They include Bump Steer; Roll Steer; Tractive Force Steer; Brake ...
The roll axis is the line through the front and rear roll centers that the vehicle rolls around during cornering. The distance from this axis to the sprung center of gravity height is the roll moment arm length.
Zero scrub radius (top) positive scrub radius (center) negative scrub radius (bottom) In an automobile's suspension system, the scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. It can be positive, negative or zero.
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Camber angle cannot change during body roll. Furthermore, the roll center moves in reaction to road irregularities. Toe is typically fixed at zero for a live axle, and dynamic toe control is difficult to implement. The mass of the beam is part of the unsprung weight of the vehicle, hurting ride quality.
The front of the H attaches to the body via rubber bushings, and the rear of the H carries each stub-axle assembly, on each side of the car. The cross beam of the H holds the two trailing arms together, and provides the roll stiffness of the suspension, by twisting as the two trailing arms move vertically, relative to each other.
Angular inertia is an integral over the square of the distance from the center of gravity, so it favors small cars even though the lever arms (wheelbase and track) also increase with scale. (Since cars have reasonable symmetrical shapes, the off-diagonal terms of the angular inertia tensor can usually be ignored.) Mass near the ends of a car ...