The Research On Bogie Selection Of Alishan Train

Alishan is a famous tourist area in Taiwan,widely favored by toruists around the world.Taking the Alishan train can not only enjoy the beautiful scenery along the way,it is also the only way up the hill,which has become a major feature of Alishan.The old sightseeing vehicles manufactured very early and its technical standards were already obsolete.With the development of Alishan tourism,the poor curving performance of old sightseeing vehicles cannot meet the requirements of tourists.The feature of Alishan railway is that the railway quality is poor,there are also many curves,and radius of which is very small.It is the key to design the bogie which plays an important role in the dynamic performance of vehicle.Combined with the characteristics of Alishan railway,radial bogie is taken.The application of flexible positioning,self-steering and forced-steering bogies is analyzed,and dynamic comparative calculation of curving performance is taken.The results show that the forced-steering bogie has better curving performance to the other two bogies with the similar lateral stability,it is therefore identified as the final project.Combined with the design requirements of bogie,the main structure is designed.The action principle and structure of forced-steering mechanism are introduced in detail.The dynamic model of forced-steering vehicle is established to analyze its dynamic performance.A brief introduction to model preprocessing is also presented.The equivalent couple method is used to simplify the forced-steering mechanism.The derivation of the equivalent stiffness and equivalent gap of articulated joints is introduced in detail.The strength of the forced-steering poles is also checked.The suspension parameters are optimized to ensure the good dynamic performance of vehicle.The LM tread is adopted according to the curving behavior and hunting stability analysis compared with the prototype.The riding index,running stability and curve negotiation performance are analyzed and predicted according to UIC 518,GB/T 5599-1985 and UIC 505.The results indicate that the indexes of dynamic performance are in the standard range.The influence of the radial joint stiffness and joint gap change on the dynamic performance is also analyzed;the results indicate that the change of radial joint stiffness and joint gap has great effect on the dynamic performance.In practice,the significant attention should be given to the state of joints of radial mechanism to avoid dynamic performance degradation substantially.