Influence of suspension damper asymmetry on vehicle vibration response to ground excitation

Bifurcation Analysis of a Rigid Impact Oscillator with Bilinear Damping

“…Compared to the research on piecewise linear dampers in [19][20][21][22][23][24][25][26][27][28][29], numerical methods including bifurcation diagrams, phase-portraits, and basin of attraction were carried out to show the influence of the forcing frequency and amplitude on the dynamics of the system. Furthermore, coexisting attractors and various types of bifurcations, such as grazing, period-doubling, and saddle-node, are observed, which show the complex phenomena inhered in the impact oscillator.…”

“…For example, shock absorber with bilinear characteristics is often used for improving the driving safety and traveling comfort of vehicles [19]. Therefor, piecewise linear or viscous dampers have received considerable attention from researchers and engineers, for example, [20][21][22][23][24][25][26][27][28][29]. In [19], the nonlinear stationary oscillations of a quartervehicle model with two degrees of freedom subjected to a vertical road excitation and bilinear damping were studied.…”

“…In [22], Verros et al studied the dynamic response of a controlled single-degree-of-freedom quarter-car model subjected to road excitation, and the control strategy applied to the system was based on the selection of two values of the damping ratio. In [23], the effect of asymmetric damping on the sprung mass position was investigated by analyzing a two-degree-of-freedom quartervehicle model. In [24], Verros et al investigated the car models involving passive damping with constant and dualrate characteristics.…”

On the distribution of nonlinear effects in locally nonlinear one-dimensional chain type structures

“…Moreover, for some mechanical engineering systems with nonlinearity, from a spatial or geometrical point of view, the nonlinearities have a local character, i.e., these local nonlinearities constitute only one or few restricted components of mechanical systems [9], but the presences of the few nonlinear components can lead the whole system to behave nonlinearly. There are considerable examples of local nonlinearities in mechanical engineering systems, such as fluid-film bearings in rotating machinery [10], dry friction and backlash phenomena in certain connections of mechanical systems [11], nonlinear spring and damper supports in vehicle systems [12], and breathing cracks in beams [13], rotors [14] or plates [15], etc.…”

Optimal synthesis of a two-stage asymmetric damper of an automotive suspension considering wheel camber variations

“…Although these studies have yielded important guidelines for suspension damper synthesis, the findings were generally based on considerations of limited performance measures, while the damping asymmetry was ignored in most of the studies. A few studies have investigated dynamic responses of a quarter-vehicle model comprising asymmetric suspension damping and suggested that damping asymmetry causes suspension 'packing or jacking down' [4][5][6], where the sprung mass experiences a mean shift in its position relative to the unsprung mass. Apart from the asymmetry in suspension damping, which affects the dynamic email: pras_bk@yahoo.com responses of the vehicle in a highly complex manner, the suspension kinematics and tyre lateral compliance may also contribute to asymmetry in the responses of the sprung and unsprung masses.…”