The motor suspension parameters were adjusted in real time to improve the hunting stability of vehicle bogie.A bogie dynamics model of motor suspension was established,including two wheelsets,one frame,and two motors.The primary suspension device was considered between wheelsets and frame,air springs and anti-yaw dampers were considered for the secondary suspension device between frame and car body,and the two motors were considered as a whole and elastically connected to the frame.Based on the minimum damping ratio of high-speed bogie system model,the optimal lateral frequency of motor was found.The influences of bogie parameters on the optimal lateral frequency of motor were analyzed,and an active motor suspension feedback control strategy was proposed for this type of bogie,so as to improve the hunting stability.Motor suspension control strategy was verified by carrying out a SIMP ACK/SIMULINK joint simulation of high-dimensional vehicles with active motor suspension.Research results indicate that the optimal lateral frequency of motor increases with the increase of the equivalert conicity of wheel-rail,when the equivalent conicity of wheel-rail increases from 0.3 to 0.6,the optimal lateral frequency of motor increases from 4.5 Hz to 7.0 Hz.Under different equivalent conicities,motor masses,and primary longitudinal stiffnesses,the difference between the optimal lateral frequency of motor and the hunting frequency of the bogie is within the range of 1.0-1.5 Hz.Therefore,the optimal lateral frequency of motor can be obtained by detecting the hunting frequency of bogie and subtracting 1.0-1.5 Hz.The relative displacement and speed between motor and frame are used as feedback signals to obtain the optimal motor suspension parameters in real time,making it an ideal power absorber.High-dimensional numerical simulations show that compared with the passive motor suspension,the active motor suspension can increase the critical speed of vehicle with wheel worn from 370-380 km·h-1to 500-510 km·h-1,and reduce the lateral acceleration of frame from 2m·s-2 to 1 m·s-2,indicating that the proposed motor suspension control strategy can effectively improve the hunting stability of bogie.14 figs,38 refs.
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