PSI - Issue 22

B.R. Miao et al. / Procedia Structural Integrity 22 (2019) 102–109 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 1. The part dynamics parameters of one EMU vehicle.

The dynamics parameter name

Abbreviation

Value 36.320

Unit

Carbody mass

M C

t

Bogie Frame mass

M BF M WS K PSV

2271 1627 0.919 0.919 0.886 0.124 0.124 0.182 2600

kg kg

Wheelset mass

Primary spring vertical stiffness Primary spring lateral stiffness Primary spring longitudinal stiffness Air-spring vertical stiffness Air-spring lateral stiffness Air-spring longitudinal stiffness Underframe equipment mass

MN•m MN•m MN•m MN•m -1 MN•m -1 MN•m -1 -1 -1 -1

K PSLA K PSLO

K PSV

K PSLA K PSLO M EQ1

kg

Fig. 1. High speed train rigid-flexible dynamics model.

2.3. Aerodynamic loads of high speed train Taking a certain type of high-speed train as the object, the aerodynamic characteristics of the high-speed train under the action of the open line are simulated. The shape of the high-speed train, especially the under-vehicle features are very complicated. It is unrealistic to completely simulate the external flow field of the real train. It is necessary to simplify the original model appropriately. The characteristics of the flow field outside the vehicle are basically stable and do not change greatly with time. The aerodynamic simulation is carried out according to the three-vehicle grouping model of the high-speed train. The aerodynamic model is used to obtain the aerodynamic load datum of the train under the crosswind 。 And the aerodynamic loads are applied to the dynamic model of the multi-body system of the train vehicle. It is applied at a pneumatic load of 300 km/h and a crosswind speed between 15.5-25 m/s. The aerodynamic model for calculating the aerodynamic performance of a high-speed train under crosswind effect is shown in Fig. 2.

Fig. 2. Aerodynamic pressure under the lateral wind of the vehicle with 300km/h