连续型浮置板轨道模态设计方法

Modal Design Method of Continuous Floating Slab Track

针对传统浮置板轨道固有频率计算方法在计算连续型浮置板轨道时的局限性,文章开展了连续型浮置板轨道模态设计的方法研究。利用线性振动理论推导了连续型浮置板轨道固有频率计算公式,并通过实际算例对比,阐释了本文提出的计算方法与传统方法的区别。最后利用有限元法,验证了该方法的准确性。结果显示:对于20 m长的浮置板轨道,本文提出的计算方法与有限元法的绝对误差仅为0.04 Hz,远小于传统方法与有限元法的误差(0.49 Hz),大幅提高了模态频率设计的精度。

Aiming at the limitation of the calculation method of natural frequency of traditional floating slab track in calculating the continuous floating slab track,in this paper,a modal design method for continuous floating slab track is developed.The formula of the natural frequency of the continuous floating slab is deduced by the linear vibration theory.The difference between the proposed design method and the traditional method is explained by the practical calculation example.Finally,the finite element method is used to verify the accuracy of the method.The results show that the absolute error of proposed method is 0.04 Hz respect to the finite element method,the traditional method absolute error is 0.49 Hz.The proposed method greatly improves the accuracy of the modal frequency design.