Публикации

Zhihui Chen, Lei Xu, Wanming Zhai. Investigation on the Detrimental Wavelength of Track Irregularity for the Suspended Monorail Vehicle System

First International Conference on Rail Transportation, Chengdu, China, July 10-12, 2017

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Abstract: Track irregularity is a crucial factor influencing the running safety and ride comfort of the suspended monorail-vehicle system. This paper puts an emphasis on the exploration of the detrimental wavelengths of track irregularities for this system. Firstly, the suspended monorail vehicle model with 52 degrees of freedom is modelled by adopting multi-body dynamics theory, where the nonlinear characteristics of tyre and stop structure are considered. Based on the random nature of vehicle-track interactions, the sixth grade track irregularity PSD of U.S. railways is taken as excitation of the driving and guiding wheels in the dynamic computations. Then the characteristic wavelengths are analysed according to the dynamic responses of typical indices of the suspended monorail vehicle by the average smooth periodogram method. On this basis, the coherence theory is employed to emphatically expose the amplitudes-wavelengths relationships between track random irregularities and accelerations of car-body, wheel-rail forces, respectively. Finally, the most sensitive wavelengths of track irregularities can be further determined for the suspended monorail vehicle system. The dynamic results show that the detrimental wavelengths which significantly affect the wheel-rail forces are in the range of 1.5m and 6~17m, and those for the car-body accelerations are mainly about 2m and 6m. This research offers a reference to the maintenance and management of the suspended monorail vehicle-track system.

Keywords: suspended monorail vehicle system; track irregularity; detrimental wavelength; coherence theory; maintenance

 
 
 

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