Suspension parameter design of underframe equipment considering series stiffness of shock absorber

Abstract

In this article, a vertical rigid–flexible coupling model between the vehicle and the equipment is established. Considering the series stiffness of hydraulic shock absorbers, the underframe equipment is like a three-element-type Maxwell model dynamic vibration absorber. The carbody is approximated by an elastic beam and the three-element-type dynamic vibration absorber for general beam system was studied by fixed-point theory. The analytical solution of the optimal suspension parameters for the beam system subjected to harmonic excitation is obtained. The dynamic vibration absorber theory is applied to reduce the resonance of the carbody and to design the suspension parameters of the underframe equipment accordingly. Then, the railway vehicle model was established by multi-body dynamics simulation software, and the vibration levels of the vehicle at different speeds were calculated. A comparative analysis was made between the vehicles whose underframe equipment was suspended by the three-element-type dynamic vibration absorber model and the Kelvin–Voigt-type dynamic vibration absorber model, respectively. The results show that, compared with the vehicle whose underframe equipment is suspended by the Kelvin–Voigt-type dynamic vibration absorber model, the vehicle whose underframe equipment is suspended by the three-element-type dynamic vibration absorber model can achieve a much better ride quality and root mean square value of the vibration acceleration of the carbody. The carbody elastic vibration can be reduced and the vehicle ride quality can be improved effectively using the designed absorber.

A Meta-Heuristic Optimization Procedure for the Identification of the Nonlinear Model Parameters of Hydraulic Dampers Based on Experimental Dataset of Real Working Conditions

“…In this sub model, three mass elements 𝑀 , 𝑀 and 𝑀 are introduced to account for the inertial terms. Generally, such elements are neglected in the lumped parameters damper modelling [12]. Nevertheless…”

“…According to [9,10], an accurate modelling of the yaw damper is crucial to assess the vehicle dynamics. The correct estimation of the damper stiffness is also important in the evaluation of ride comfort performances: different studies [11,12,13] considered this effect when modelling yaw or vertical dampers.…”

Mathematical Modeling and Simulation of Suspended Equipment Impact on Car Body Modes

“…Many researchers have thus far contributed to the clarification of rail vibration modes. In particular, the relationship between short-pitch rail corrugation and pinned-pinned resonance at about 1 kHz has been reported [18][19][20][21][22][23].…”

Research on Inertial Force Attenuation Structure and Semi-Active Control of Regenerative Suspension

“…Mikułowski G et al [26] and Martini A et al [27] connected the damper in series with oil and gas springs to reduce the dynamic wheel loads and keep the comfort of the vehicle unchanged. Chen Jie et al [28] improved the vibration absorber of the vehicle body by connecting the shock absorber in the original vibration absorber with the spring in series, forming a ternary vibration absorber composed of two springs and one shock absorber. Much research has shown that the new structure reduces the root mean square value of the vehicle body vibration acceleration and effectively reduces the elastic vibration of the vehicle body.…”