Influence Of Secondary Suspension Parameters On The Dynamic Interaction Between The Heavy Haul Locomotive And The 102-Type Coupler

There are two types of couplers widely used in China,which are the coupler with an arc contact surface and the other with two elastic shoulders instead.As a typical frictional coupler,the 13 A coupler has been widely used in HXD1 and HXD2 electric locomotives.During the actual operation,the coupler gradually exposes the problem that the yaw angle is too large and the lateral displacement of the car-body is serious,which affects the safe running of trains.Although the 102-type coupler has not been widely used,the lateral displacement of the carbody can be effectively controlled due to its small yaw angle.It is concerned that whether this type of coupler could match the heavy haul locomotive.Therefore,the influence of secondary suspension parameters on the dynamic interaction between the heavy haul locomotive and the 102-type coupler is investigated in order to provide theoretical support for the coupler selection,parameter matching and safe using of heavy haul locomotive.This paper first introduces the structural characteristics of the eight-axle locomotive and the stable mechanism of the 102-type coupler,and then analyzes the dynamic interaction of the car-body and coupler.Secondly,a simplified model of "1+1" traction the 20,000-ton heavy haul train is established using the SIMPACK software.Based on the dynamic model of the heavy haul train,influences of secondary suspension parameters such as the secondary lateral stiffness,free and elastic clearances of the secondary lateral stopper on the car-body and coupler are studied.Small lateral stiffness and stopper stiffness,large stopper free and elastic clearances could reduce the wheelset lateral force and derailment coefficient,but increase the coupler force.When the lateral stiffness of secondary system is 0.5 MN/m the elastic stiffness of the stopper is 1.11 MN/m,the sum of the free and elastic clearance of the stopper should be not less than 40 mm.And the free clearance should be no less than 30 mm,and the elastic clearance should be no less than 10 mm to keep low axle lateral force and derailment coefficient.Finally,an optimized parameter scheme for matching the 102-type coupler with the eightaxle heavy haul locomotive is proposed,and dynamic performances of the "1+1" traction the 20,000-ton heavy haul train bearing longitudinal pressure on straight and curved tracks are analyzed when the optimization scheme is adopted.Based on the above research,an optimization scheme for matching the performance of the heavy haul locomotive and coupler is proposed,in which the lateral stiffness is 0.5MN/m,the stopper stiffness is 1.11MN/m,and the free and elastic clearances is 35 mm and 15 mm respectively.Finally,dynamic performances of the heavy haul locomotive adapting the optimized scheme are analyzed.The results show that safety indexes can meet the requirements when the vehicle passing through the straight and curved tracks.When the 20,000-ton heavy haul train is running on the straight and the longitudinal pressure is no more than 2500 kN,kinetic indicators of the locomotive are all less than the safety limit.The 1+1 traction 20,000-ton train with 102-type coupler all could withstand 2200 kN longitudinal pressure force through the curved track with the 600 m radius at the speed of 40 km/h,the curved track with the 800 m radius at the speed of 50 km/h and the curved track with the 1400 m radius at the speed of 80 km/h.And the heavy haul locomotive with 102-type coupler could bear large longitudinal pressure.