Parametric Modeling Of High-speed Train Hydraulic Dampers

Hydraulic damper is an important damping component of railway vehicle suspension system, its damping characteristics play very important role on stationary and stability of train running. At high operational speeds, the train system becomes very sensitive to service parameters of hydraulic damper; on the other hand, optimum design of suspension parameters and damper own parameters is to develop integrated design,therefore, The establishment of parametric model high-speed train hydraulic dampers has important practical significance.This paper addresses a more adaptive nonlinear parametric modeling of a hydraulic yaw damper than Maxwell model, this concept is used in Hydraulic yaw damper parametric modeling of the chinese SS9 electric locomotive. For operating characteristics of hydraulic yaw damper in High-speed condition, The model considers the influence of the series stifness,the small fixing clearance and the viscous damping, the series stiffness is the tandem result of the dynamic oil stiffness, the rubber attachment stiffness and the fixing seat stifness; A dynamic oil property model is embedded in the modeling process,which is affected by the oil temperature, the instantaneous working pressure and the entrapped air ratio of the oil; Damping characteristics of damper is simulated using MATLAB software,The impact of the oil temperature, the rubber attachment stiffness, the entrapped air ratio of the oil and the fixing clearance on damping characteristics of damper are analysed. Fanally, the bench experiments validate that the established nonlinear parametric model is accurate and robustFor three kinds of semi-active hydraulic damper which are switched using high-speed solenoid valves, regulated by an inversely proportional relief value and regulated by a proportional throttle valve respectively, parametric model of changeable damping characteristics is established based on the conceptual design. According to the matched vehicle model, the initial selection and design of this semi-active damper are carried out through the conceptual design, which provide the basis for follow-up control system design and detailed design of damper...