| Traction drive system is the main transmission path of railway locomotive power,and is also a weak part for bogie as well as locomotive.Besides,as one of the most important element of the whole mechanical system,performance of the traction drive device will affect the operation of the locomotive directly and is closely related to the service state and safety of the train.With the further development of China’s heavy haul railways,high power,large axle load and high speed are the trend of locomotive design,which have higher requirement and severe challenge for service state and safety of the gear transmission system.Meanwhile,gear drive system failure will hinder output of traction/braking power of the locomotive,in severe cases,the train may out of control even derailed,which have an adverse impact on the ride comfort and running safety of the train.Therefore,researching on coupling dynamic interaction between gear transmission system and locomotive system and considering impact of the gear transmission system on the dynamic performance of high power heavy-haul locomotive have important theoretical significance and practical engineering application value for ensuring security as well as stable operation of the train.In analysis and summarizes general situation of the locomotive and the gear transmission system dynamics research both at home and abroad,main type of electric locomotives currently in use in our country,structural characteristics and working principle of gear transmission system,the author establish a dynamic model of heavy haul locomotive with gear transmission system by using multi-body dynamics method and deduce the axle load transfer of the 2(Bo-Bo)locomotive with axially symmetrical arrangement of traction drive device.The correctness of the locomotive system dynamics model is verified by comparing with the test data.On these basis,the dynamic performance of heavy haul locomotive that considering gear transmission system is studied.Firstly,on the basis of revealing the coupling mechanism of gear transmission system,the multi-rigid-body dynamics software is used to establish the dynamic model of heavy haul locomotive including gear transmission system.Using the established model,response of the locomotive and bogie frame is calculated and compared with the tested results.The results show that the response waveforms of the body and the bogie frame are in good agreement with the results measured by the experimental test.For instance,under the research conditions,the maximum vertical vibration acceleration of the car body obtained by the test and simulation calculation is 0.30g and 0.28g;the maximum lateral vibration acceleration of the car body obtained by the test and simulation calculation is 0.030g and 0.026g;the maximum vertical vibration acceleration of the bogie frame obtained by the test and simulation calculation is 0.65g and 0.60g;the maximum lateral vibration acceleration of the bogie frame obtained by the test and simulation calculation is 0.48g and 0.50g.Secondly,the theoretical calculation formula of axle load transfer of heavy haul locomotive is deduced,and the difference between the calculation results of theoretical analysis formula and locomotive dynamic model that considering gear transmission system is compared.The results show that the calculated results are in good agreement with each other in value and trend.In addition,for taking into account the coupling of various dynamic excitation in the actual operation of the locomotive,the dynamic model can further reflect dynamic axle load transfer phenomenon during the running process.Finally,ride comfort,running safety,locomotive/rail dynamic interaction and other kinetic evaluation index of heavy haul locomotive model that considering gear transmission system and traditional locomotive model that ignoring gear transmission system are calculated and compared,and the influence of the coupling effect of the gear transmission system on the dynamic performance of the locomotive is revealed.The results show that the two models show some differences in derailment coefficient,rate of wheel load reduction,body vibration response,bogie frame vibration response,ride comfort index,wheel/rail vertical force,wheel/rail lateral force and wheel/axle lateral force.Especially,the difference between the two models is more obvious on amplitude and trend of rate of wheel load reduction,wheel/rail vertical force,wheel/rail lateral force. |
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