Vibration analysis of a nonlinear half-vehicle model caued by the consecutive speed control humps

• 1、College of Automation, Chongqing University, ChongQing 400044
• 2、College of Automation,Chongqing University,Chongqing 400044,China
• 3、Department of Mechanical Engineering,Oyama National College of Technology,Nakakushi Oyama 323-0806,Japan

Abstract：Ihis paper is aimed at investigating the complicate vibration of the nonlinear half -vehicle model with 4-DOF(degree of freedom) through the excitations caused by rough road surface. In the paper,the consecutive speed contol humps(SCHs) dynamic excitation function is presented.A 4-DOF vehicle suspension model with nonlinear spring and damper is modeled. The vibration characters of 4-DOF nonlinear vehicle suspension system are investgated by analysing speed bifurcation diagram and Poincaré maps of 4-DOF virants which obtain body's vetical displacement,angle of pitch,displacements of front and rear wheels when passing over the consecutive SCHs. Numerical results confirm that the chaotic vibration response may be excited by the consecutive SCHs .It is useful to the dynamics analysis of vehicle and design of the consecutive SCHs.

Keywords： consecutive speed control humps nonlinear half-vehicle model suspension system chaotic vibration