| The continuous development of the Silk Road Economic Belt strategy has strengthened the international road connectivity,promoted the development of international combined transportation and interregional transportation,and provided a convenient platform for economic and trade exchanges between China and neighboring countries.In 2016,the Ministry of Science and Technology put forward the project of 400km/h cross-border intermodal high-speed trains,in order to meet the strategic demand of "going global" of high-speed trains,as one of the most effective ways to solve the interconnection of different gauge roads,gauge-changeabel technology has begun to flourish in China.In this paper,the development status and characteristics of foreign gauge-changeable trains,bogies and ground transformation facilities are summarized.According to China's national conditions,the key technologies and design difficulties in the research of gauge-changeable bogies are analyzed and summarized in detail.Based on this,starting with the wheelset axle box and basic braking device of gauge-changeable bogies,two schemes of wheelset locking mechanism are designed:? The locking mechanism is located at the inner side of the wheel and can be applied to bogies of freight car,passenger car and CRH5 body suspension style motor structure;? The locking mechanism is located in the middle of the axle box on the outside of the wheel and can be adapted to the motor car bogie with traditional frame suspension style motor.Aiming at the transverse movement of the wheel disk braking device for the power car bogie,3 kinds of follower mechanism with different principles and different control methods are designed: ? Passive follower mechanism with full mechanical structure;? Semi-active follower mechanism with hydraulic unlocking;? Electromechanical active follower mechanism with servo motor control traverse.Then,ADAMS software was used to carry out dynamic interference simulation on the motion characteristics of follower mechanism,and the stress state was analyzed.The simulation results were consistent with the theoretical design,which verifies the correctness of parameter calculation and the rationality of mechanical structure design.Based on the above structural design and the top index requirements of the 400km/h cross-border intermodal high-speed trains,a gauge-changeable bogie structure scheme for high-speed EMUs is designed.The key technical problems of ground transformation facility are analyzed and discussed,a kind of ground transformation facility matching gauge-changeable bogie of high-speed EMUs is designed,and the coordination principle and the gauge-changeable process between the ground facility and the bogie are analyzed in detail.The single vehicle dynamics model of the gauge-changeable vehicle was built with the dynamics simulation software SIMPACK,and the running stability,stationarity and curve passing performance of the gauge-changeable vehicle under different gauge,different rail profile and rail cant were simulated and analyzed.The results show that the gauge-changeable vehicle has better dynamic performance when the gauge is 1520 mm,each dynamic index is better than 1435 mm gauge.The straight-line stability and curve safety indexes of gauge-changeable vehicle on different lines all meet the limit values in relevant standards,and the vehicle stability also meets the design requirements.Finally,the adaptability of gauge-changeable vehicle to 4 kinds of wheel tread(LMB10N,S1002 CN,LMA,XP55)on two kinds of rails(CHN60,GOST P65)was analyzed and studied,from the aspects of wheel-rail contact relationship,vehicle stability,stationarity and curve safety,respectively.The results show that,LMB10 N wheel tread can meet the design speed requirements of the gauge-changeable bogie,and has better stability index and curve safety index.The other 3 types of tread profile cannot meet the requirements of design speed,vehicle stability and curve safety at the same time.LMB10 N wheel tread is selected after comprehensive consideration,which can better meet the dynamic performance requirements of gauge-changeable vehicles under two kinds of track parameters. |
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