the plot indicates that for a vehicle with a given tread and cg height,the highest rollover threshold will be achieved by maintaining the sprung mass roll rate at the highest possible level (using suspensions with high tool stiffness ), and by designing the front and rear suspensions so as to have the inside wheels lift off at the same roll angle condition.
exper methods have been developed to measure the quasi-static rollover threshold by use of a "tilt-table". As suggested by the name, the table tilts the vehicle in the lateral, or roll,plane and from measurement of the angle at which rollover occurs,the threshold is determined. The method is reasonably accurate for heavy trucks which have a high centre gravity and experience rollover at small angles ( on the order of 20 to 25 degrees ).
for passenger cars, however , the rollover threshold may well be on the order of 45 degrees. At hight angles the component of the vehicle weight acting downward in the vehicle plane is reduced substantially ( 30 person at 45 degrees ). the reduced loading on the suspensions and tires raies the body above its normal ride position causing premature rollover and invalidating the test. In order to avoid these errors,test procedures must be devised which impose a lateral force at the centre of gravity ( the "cable pull" test ) or by applying a pure moment to the body of the vehicle.
the plot indicates that for a vehicle with a given tread and cg height,the highest rollover threshold will be achieved by maintaining the sprung mass roll rate at the highest possible level (using suspensions with high tool stiffness ), and by designing the front and rear suspensions so as to have the inside wheels lift off at the same roll angle condition.
exper methods have been developed to measure the quasi-static rollover threshold by use of a "tilt-table". As suggested by the name, the table tilts the vehicle in the lateral, or roll,plane and from measurement of the angle at which rollover occurs,the threshold is determined. The method is reasonably accurate for heavy trucks which have a high centre gravity and experience rollover at small angles ( on the order of 20 to 25 degrees ).
for passenger cars, however , the rollover threshold may well be on the order of 45 degrees. At hight angles the component of the vehicle weight acting downward in the vehicle plane is reduced substantially ( 30 person at 45 degrees ). the reduced loading on the suspensions and tires raies the body above its normal ride position causing premature rollover and invalidating the test. In order to avoid these errors,test procedures must be devised which impose a lateral force at the centre of gravity ( the "cable pull" test ) or by applying a pure moment to the body of the vehicle.
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