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In order to solve the rail corrugation in the curve section of steel spring floating slab track in a metro, firstly, the characteristics of rail corrugation were tested on site. Secondly, according to the characteristics of rail corrugation, the precise tuning and development of wide-frequency tuned mass damper (WTMD) were carried out. Then, the parameters such as mass, stiffness and damping of WTMD were input to the established Vehicle-WTMD-Steel spring floating slab coupled dynamic model. The floating slab and foundation were considered as flexible bodies in the model. The wheel-rail contact was solved by the Kik-Piotrowski model, a multi-point non-Hertzian contact model. The 5th grade power spectral destiny formula from USA superimposed on the measured corrugation irregularity spectrum were used as excitation. The finite element software ANSYS and the multi-body dynamics simulation software UM were used to carry out the coupled dynamics analysis, and the WTMD parameters were optimized iteratively. At the same time, the rail vibration accelerations obtained by simulation analysis with or without WTMD were compared with the field measured data, and the influence of WTMD on rail vibration was studied. Finally, the total rail vibration level, track decay rate and three times corrugation tracking tests, with or without WTMD, were carried out to study the influence of WTMD on the rail vibration, the track decay rate and the corrugation development. The results show that: The first three dominant frequencies of the designed WTMD are 518 Hz, 700 Hz and 759 Hz, which are consistent with the vehicle passing frequency (520~830 Hz). The simulation and measured data are in good agreement, and the rail vertical vibration acceleration RMS is reduced from 200 g to 20 g after the installation of WTMD, and the vibration reduction effect is 8.1 dB. The WTMD can improve the vertical and lateral track decay rate and suppress the vertical and lateral rail pinned-pinned resonance. The three times corrugation tracking tests find that the rail corrugation develops slowly after the installation of WTMD, the rail corrugation is invisible.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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