The Motor Active Flexible Suspension and Its Dynamic Effect on the High-Speed Train Bogie

Abstract

We put forward the motor active flexible suspension and investigate its dynamic effects on the high-speed train bogie. The linear and nonlinear hunting stability are analyzed using a simplified eight degrees-of-freedom bogie dynamics with partial state feedback control. The active control can improve the function of dynamic vibration absorber of the motor flexible suspension in a wide frequency range, thus increasing the hunting stability of the bogie at high speed. Three different feedback state configurations are compared and the corresponding optimal motor suspension parameters are analyzed with the multi-objective optimal method. In addition, the existence of the time delay in the control system and its impact on the bogie hunting stability are also investigated. The results show that the three control cases can effectively improve the system stability, and the optimal motor suspension parameters in different cases are different. The direct state feedback control can reduce corresponding feed state's vibration amplitude. Suppressing the frame's vibration can significantly improve the running stability of bogie. However, suppressing the motor's displacement and velocity feedback are equivalent to increasing the motor lateral natural vibration frequency and damping, separately. The time delay over 10 ms in control system reduces significantly the system stability. At last, the effect of preset value for getting control gains on the system linear and nonlinear critical speed is studied.

Vibration Analysis of Traction Drive System Components Based on the Field Test for High-Speed Train

“…Internal excitations such as harmonic torque output by the traction motor and meshing of the gearbox would cause motor vibration and would transmit it to the motor hanger. Te external excitation of the wheel-rail is transmitted to the frame through the primary suspension and then to the motor hanger and traction motor [19,20].…”

Stability control of high-speed bogies using an adaptive vibration absorber

“…His further works focused on three different state feedback configurations and the multi-objective optimization (MOOP) with two objective functions about the stability index and the control effort was solved by the NSGA-II algorithm for getting the feedback gains. 6 The absolute displacement/velocity signals of the bogie frame and motors were also used as the state feedback in this paper. Although laser or magnetostrictive position sensors can be used to detect absolute displacement, their placement requires a stationary reference which is impractical in vehicle system.…”

An active suspension system for enhancing running safety of high-speed trains under strong crosswind

“…[10][11][12] Typically, active suspension systems can be classified into four functional categories: vibration control, [13][14][15] steering and guidance of wheelsets, 16,17 carbody titling 18,19 and hunting stability improvement. 17,20,21 Despite numerous studies focused on these areas, research on the use of active suspension systems to enhance the operational safety of HSTs has been relatively limited. Alfi et al 22 proposed an active airspring together with active lateral suspension to increase train rolling resistance under crosswind, and a PD regulator with feedforward regulator was adopted in the research.…”