Abstract
When vehicles are driven on consecutive speed control humps, the parameters of speed control humps such as height, width, and space and vehicle’s speed are the important factors to affect safety and comfort of passengers. The paper assumes that the excitation function of the consecutive speed control humps is a half-sine wave and a SCHs-speed coupling excitation model called 7-DOF nonlinear full-vehicle model and differential equation are established by introducing the time delay of incentive input and then by using numerical simulation to analyze chaotic vibration in 7-DOF nonlinear full-vehicle model excited by consecutive speed control humps. The numerical simulation results show that chaotic vibration phenomenon possibly appears as vehicles are driven on consecutive speed control humps. Further studies indicate that the influence of nonlinear running state of vehicle on driving comfort becomes manifest as the state changes from chaotic motions to the periodic motion of the high speed and the periodic motion of the low speed, and this phenomenon can be avoided by changing the parameters of consecutive speed control humps. The results can be applied in design of vehicle and road humps pavement.
Highlights
Road speed control humps are a kind of forced road traffic safety facilities, which play an important role in curbing the occurrence of traffic accidents [1, 2]
Under the condition of four wheels with time delay, chaotic vibration of 7-DOF nonlinear vehicle model and the relationship between vibration and comfort are researched, and the complex dynamic behavior of the system is obtained by numerical simulation
We found that when the speed of the vehicle reaches a certain range, the instability regions of system appear, while the phenomenon in the study of 2-DOF and 4-DOF vehicle model could not be obtained
Summary
Road speed control humps are a kind of forced road traffic safety facilities, which play an important role in curbing the occurrence of traffic accidents [1, 2]. We study the action of nonlinear vibration of the automobile suspension system under the fixed amplitude and different frequency areas of road surfaces, and the relationship between the nonlinear running state of vehicle and the driving comfort It is of great practical significance for designing vehicle and road pavement. Aiming at this special road of the SCHs in highway, the SCHs-speed coupling excitation model, 7-DOF nonlinear full-vehicle model, and dynamic equation are firstly presented, the response of nonlinear chaotic vibration of 7-DOF nonlinear full-vehicle model excited by consecutive SCHs is analyzed by numerical simulation, the range of the chaotic vibration frequency is derived, and the relationship between the nonlinear running state of vehicle and the driver’s comfort is obtained from the perspective of vibration strength (VS) and vibration amplitude (VA). It is concluded that the low periodic motion zone is the strongest region for affecting the vehicle comfort, adjusting the parameters of SCHs to avoid this phenomenon
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