| In recent years,with the continuous development of national railway technology,the export volume of locomotives is also increasing.However,there are some differences in gauge between some exporting countries and China ’s railways.For example,Belarus,Ukraine and other countries adopt 1520 mm wide-gauge railways,which will affect the variation law between suspension parameters and locomotive dynamic performance.The suspension system is an important part of the locomotive,and its parameter changes will significantly affect the dynamic characteristics of the locomotive.Therefore,how to select reasonable suspension parameters has gradually become the focus of locomotive dynamics research.This paper mainly studies the influence of the matching relationship between the suspension parameters on the lateral dynamic characteristics of the locomotive through the dynamic simulation model of the wide rail locomotive.Firstly,the influence of suspension parameters on the lateral stability of locomotive is analyzed.The critical speed analysis model of locomotive bogie and the 10-degree-of-freedom snake-like motion differential equation are established.The characteristic root method is used to obtain the variation law of suspension parameters and critical speed.Compared with the law obtained by simulation method,the correctness of the dynamic simulation model is verified.Then,the influence of single suspension parameters on lateral stability is studied by dynamic simulation,and the key suspension parameters are obtained.Then,the influence of the matching relationship between key suspension parameters and other suspension parameters on lateral stability of locomotive is further analyzed.Finally,this research process is extended to the analysis of lateral stability and curve passing of locomotive.According to the results,it can be seen that :The interaction of the suspension parameters is the most significant in the study of the lateral stability of the locomotive.The primary lateral stiffness and the secondary lateral damper damping coefficient(referred to as the secondary lateral damping)are important parameters affecting the lateral stability of the locomotive.The matching relationship will significantly affect the lateral stability of the locomotive.When the primary lateral stiffness is large,with the increase of the secondary lateral damping,the optimal lateral damping value will appear to maximize the nonlinear critical speed of the locomotive.The larger the primary lateral stiffness,the smaller the optimal damping value.However,the change of some non-critical suspension parameters will also affect this matching relationship. |
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