Abstract
This paper investigates the bandwidth sensitivity of automobile handling, comfort, and stability based on Monte Carlo sensitivity simulations. Performed bandwidth sensitivity simulations include the effects of vehicle geometry and suspension parameters on lateral acceleration, roll angle, front/rear sideslip angles, and yaw rate angle, including both time- and frequency-domain sensitivity analyses. To replicate actual automobile responses, a full-vehicle roll-oriented suspension seven-degree-of-freedom (7-DOF) model was developed and implemented considering a 2-DOF planar two-track model with a nonlinear Pacejka tire model. During the Monte Carlo simulations, 10 mm and 20 mm amplitude sine-wave excitations were used for the left and right sides, respectively, and the frequency was uniformly sampled over the range of 0–30 Hz. Simultaneously, each investigated vehicle parameter varied by ±25% relative to the reference model parameters. These simulations illustrate the sensitivity of the lateral acceleration, roll angle, yaw angle, and sideslip angles to their parameter variations. The results confirm that the road excitation frequency, tire properties, vehicle geometry, and suspension parameters significantly influence the vehicular lateral and roll stabilities when considering the lower and higher peaks and the frequency bandwidths of the lateral and roll stabilities. Interestingly, the longitudinal location of the center of gravity and the tire properties can achieve more significant peak lateral stability responses, as represented by the front and rear sideslip angles and the frequency bandwidth, compared to the other vehicle parameters at high frequencies. Choosing the correct tire properties and vehicle geometry, as well as suspension characteristics, plays an essential role in increasing the vehicular lateral stability and the rollover threshold. Variations in the studied parameters allow for higher vehicular stability when a vehicle is driven on random road surfaces.
Highlights
Studies of vehicle dynamics can make fundamental contributions to the further development of the vehicle industry
Handling dynamics deal with the lateral or transverse vehicle dynamics, which primarily refer to the vehicular handling stability, sideslip caused by lateral tire forces, and yaw and roll motions
Joshi et al [39] studied the effect of the steering input frequency on the transient handling dynamics of sport utility vehicles (SUVs). eir results indicate that the yaw rate and lateral acceleration responses are significantly correlated with low-frequency steering inputs below 2 Hz
Summary
Studies of vehicle dynamics can make fundamental contributions to the further development of the vehicle industry. Joshi et al [39] studied the effect of the steering input frequency on the transient handling dynamics of SUVs. eir results indicate that the yaw rate and lateral acceleration responses are significantly correlated with low-frequency steering inputs below 2 Hz. e critical rollover factor was determined considering the steering frequency with different steering amplitudes and vehicle speeds in Ref. Frequency-based sensitivity simulations aim to identify the least and most influential parameters/variables to reveal correlations between the parameters and the system performance In this sense, continued efforts are necessary to provide greater insight into the impacts of both low- and high-frequency road excitations on vehicular lateral stability and rollover propensity. Based on Monte Carlo simulations, the current study conducted a complete frequency-based parametric bandwidth sensitivity analysis associated with vehicle lateral and roll stability of a 9-DOF passenger vehicle model. Ese frequency-based parametric bandwidth sensitivity analyses highlight the bandwidth change in the peak amplitudes and resonant frequency bandwidths of the lateral stability and rollover propensity. us, complete frequency-based bandwidth sensitivity simulations would provide insights into the on-resonance and off-resonance performance of the lateral stability and rollover propensity
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