It is a virtual point in which longitudinal forces can be The kinematic pitch centre is the longitudinal equivalent of the kinematic At factory ride height, youĬan expect a rear anti-lift angle of 22 deg and rear anti-lift ratio of 1.96. Percentage of rear anti-lift is likely much less. Into consideration the percentage of rear braking force, so the effective Swing axle is also much shorter as compared to the front suspension, The graph below shows the trend of the rear anti-lift angle and the rearĪnti-lift ratio through the heave travel.īecause of the rear suspension architecture, the side-view kinematic instantĬentre for does not move much relative to the suspended mass. Vehicle fore/aft weight distribution \(\text\].Safety Administration, the following values are used for the weightĭistribution and the centre of gravity height: Representative of what would happen when the vehicle is lowered.īased on published data for the Acura RSX by the National Highway Traffic Wheels are displaced the same amount and in the same direction. The analysis will focus on what happens in heave. Because there are many types of antis, we will discuss them in the The use of antis in kinematic analysis is convenient because it handlesĪsymmetries in the suspension geometry and in the forces applied at each Swing axles is the kinematic pitch centre. The intersection of the front and rear side-view virtual Line from the tire contact patch to its respective side-view kinematic Under braking, the side-view virtual swing axle is formed by drawing a the line defined by the two inboard attachment points of the lower control arm.The side-view kinematic instant centre for the H-arm with camber link rear the side-view plane defined by the front and rear tire contact patches.the upper strut plane defined by the upper strut attachment point and a normal vector defined by the strut.the lower control arm plane defined by the two inboard attachment points and the outer ball joint.Suspension is found at the intersection of: The side-view kinematic instant centre for the MacPherson strut front The side-view kinematic instant centre is determined differently for theįront and rear wheels because they have different suspension architectures. Longitudinal forces can be resolved into the suspended mass. Kinematic pitch centre is a virtual point on the side plane where The same concepts can be applied for the longitudinal dynamics. Similar to how we discussed the front kinematic roll The kinematic simulation used in this study is self-developed using free and The assembled virtual vehicle is shown below. Virtual environment where the linkages can be articulated through its range Using computer simulation, a kinematic model of the Acura RSX is created in a TheĪcura RSX suspension system is shown below with the front and rear designs on For the rear suspension, the H-arm formedīy the lower control arm reacts the longitudinal forces exclusively. Of a lower control arm and a strut assembly, both of which locate the The MacPherson strut front suspension consists The Acura RSX features a MacPherson strut front suspension and a H-arm withĬamber link rear suspension. The definition of anti-lift andĪnti-dive geometry is discussed, and the existence of a pitch centre is To gain an appreciation of these interactions, we will analyze the side-view Meaning the load paths from both front and rear axles must be considered to Four wheel braking is a full vehicle event, The relationship between the front and rear axles become clear whenĪnalyzing the side-view geometry. Vehicle chassis systems work together to react handling loads in a desirable
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