固定辙叉心轨轨顶降低值优化  

Optimization of Nose Depth for Rigid Frog

作　　者：曹洋[1] 王平[2] 

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《西南交通大学学报》2015年第6期1067-1073,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51078320)

摘　　要：为合理选取固定辙叉心轨轨顶降低值,基于车轮踏面在翼轨和心轨间过渡时的轮轨接触几何关系和动力相互作用,提出了心轨关键断面降低值的选取及评价方法.以LMA型车轮踏面列车直逆向通过60 kg/m钢轨12号固定辙叉式道岔为例,用该方法对心轨轨顶降低值进行了优化.结果表明:心轨关键断面降低值的确定,在满足固定辙叉区轮载过渡的安全性和心轨承载断面强度要求的同时,应提高列车运行的稳定性;断面降低值越小,产生的轮轨相互作用越小,有利于提高行车性能,但需考虑此时轮轨作用位置是否超出心轨结构承载能力范围;60 kg/m钢轨12号固定辙叉心轨顶宽20和50 mm断面处,可分别取3和0 mm降低值作为优选方案.Based on wheel-rail contact relationship and dynamic interaction when wheel treads pass from wing rail to nose rail,a design and evaluation method for nose depth selection of key crosssections was proposed to select reasonable nose depths for rigid frog. A train with LMA wheel treads passing over No. 12 turnout of rigid frog in the facing move of the straight direction was taken as an example,and the optimization of nose depths was carried out by this method. The research results show that the nose depths of key cross-sections should not only satisfy the safety of wheel-load transition and the strength of nose rail,but also improve the train running stability. The smaller the nose depth,the smaller the wheel-rail interaction,which is helpful to improve the running performance,but whether the wheel-rail interaction location exceeds the scope of nose bearing capability should be taken into account. To a No. 12 turnout of rigid frog,the optimal nose depths of the cross-sections with railhead widths of 20 and 50 mm should be 3 and 0 mm respectively.

关 键 词：固定辙叉 心轨降低值 轮轨关系 过渡断面 动力响应 

分 类 号：U213.6[交通运输工程—道路与铁道工程]