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Abstract. Many military vehicles are being developed which use a hybrid
electric drive system. Of these, a number utilise drive motors
mounted within some or all of the road wheels. Of
necessity these wheel-motor assemblies are somewhat heavier than the similar,
existing, conventional road wheels. This extra mass has implications for
both the ride within the vehicle and the design of
the suspension-wheel-motor system. This paper looks at the implications of
the extra mass within the wheel assembly as it increases
the unsprung mass of the vehicle. Linear and non-linear single-wheel
station models have been developed in order to quantify the
effects of the modified design. A range of sprung-to-unsprung mass
ratios have been analysed using the models. The behaviour of
the vehicle at a range of speeds and different obstacles
has been simulated. The results show the predicted accelerations and
vibration dose value (VDV) vary with both speed and sprung-to-unsprung
mass ratio. The behaviour of the suspensions for the random
ride and step impact conditions show that the ride quality
and acceleration levels deteriorate with vehicle speed. For the pothole
simulation, however, the higher unsprung mass conditions show an improvement
in some aspects as speeds increase, because the wheel effectively
‘skips over’ the pothole and the resultant impact is reduced.
Related topics:
tracked vehicles, transmission, mobility
View first page of "Purdy: A Brief Investigation into the Effect on Suspension Motions of High Unsprung Mass"
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