Three dynamic models of a passenger car including the one-dimensional dynamic
model, two-dimensional dynamic model, and three-dimensional dynamic model are
built to evaluate the ride quality of the passenger car as well as the isolating
performance of the SNS (structure of negative stiffness). The decrease of the
root-mean-square (RMS) accelerations in the seat and car’s body shaking is the
research goal. The investigation results indicate that under all working
conditions including the various excitations of the road surface and various
velocities of the passenger car, the seat’s acceleration with SNS is strongly
ameliorated in comparison without SNS in all three models of the passenger car.
Particularly, the RMS seat acceleration with SNS in one-, two-, and
three-dimensional models is strongly reduced in comparison without SNS by
76.87%, 66.15%, and 70.59%, respectively. Thus, the seat’s SNS has a good effect
in isolating the vertical vibration of the passenger car’s seat. However, in
both two- and three-dimensional models, the SNS doesn’t improve the passenger
car’s pitching angle. Conversely, the SNS in the three-dimensional model also
has a great impact on improving the passenger car’s roll vibration. Thus, the
three-dimensional model should be used to fully evaluate the isolating
performance of SNS in all the vertical, pitch, and roll vibrations of the
passenger car.
