When these mechanisms are precisely modeled, the quasi-static roll response of a motor vehicle will tale the form shown in Figure 9.4 . At low levels of lateral acceleration the vehicle roll response increases linearly with a slope equal to the roll rate. This proceeds until one of the inside wheels lifts off. ( Both the front and rear wheels will not necessarily leave the ground at precisely the same instant on an actual vehicle due to differences between the front and rear suspensions and their loads. In the case of multi-axle trucks, the slope will change with the lift-off of each inside wheels,resulting in a curve with three or four line segments in this area. ) At this point the response changes to a lower slope because the roll rate is reduced to that provided by the one suspension that remains in contact with the ground. When the second inside wheel lifts, the rollover threshold has been reached. Thereafter, the roll response follows the downward sloping line, closely eqivalent to that discussed in the case of the rigid vehicle.
When these mechanisms are precisely modeled, the quasi-static roll response of a motor vehicle will tale the form shown in Figure 9.4 . At low levels of lateral acceleration the vehicle roll response increases linearly with a slope equal to the roll rate. This proceeds until one of the inside wheels lifts off. ( Both the front and rear wheels will not necessarily leave the ground at precisely the same instant on an actual vehicle due to differences between the front and rear suspensions and their loads. In the case of multi-axle trucks, the slope will change with the lift-off of each inside wheels,resulting in a curve with three or four line segments in this area. ) At this point the response changes to a lower slope because the roll rate is reduced to that provided by the one suspension that remains in contact with the ground. When the second inside wheel lifts, the rollover threshold has been reached. Thereafter, the roll response follows the downward sloping line, closely eqivalent to that discussed in the case of the rigid vehicle.
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