Suppression of Rail Corrugation by Double Rail Vibration Absorber in Cologne-egg Fastener
Rail vibration absorber is a common method to suppress rail corrugation in subway lines.However,the suppression effect of double rail vibration absorber on rail corrugation is not clear.Therefore,the work aims to study the suppression effect of double rail vibration absorber on rail corrugation in Cologne-egg.Firstly,through the field investigation of Jiaochangkou-Xiaoshizi section of Chongqing Line 1,it was found that the rail corrugation was mainly concentrated in the low rail of the curve of small radius.After the installation of rail vibration absorber,the rail corrugation could be suppressed to a certain extent.Then,combined with the field investigation,the finite element model of the upper wheel-rail-vibration absorber system in the curve section with small radius supported by the Cologne-egg fastener was established.Based on the theory of friction self-excited vibration,the suppression effects of single rail vibration absorber and double rail vibration absorber on rail corrugation were compared by complex eigenvalue method and instantaneous dynamic method.According to the three unstable frequencies of friction self-excited vibration of wheel rail system of 228.57 Hz,480.97 Hz and 1 181.60 Hz,the suppression effect of single rail vibration absorber can reach 15.20%,100%and 20.19%,respectively.The suppression effect of double rail vibration absorber was 15.20%,100%and 100%.The vibration absorber of double rail could effectively suppress the friction self-excited vibration of wheel rail system,and the effect of double rail vibration absorber was better than that of single rail vibration absorber.In order to explore the principle of better suppression effect of double rail vibration absorber,the harmonic response method was used to analyze the tuning frequency of two mass blocks of double rail vibration absorber to explore the suppression range of double srail vibration absorber on rail corrugation.Two tuning frequencies 183.64 Hz and 473.62 Hz were found for the double rail absorber,which indicated that its suppression range was wider.Finally,the effect law of different connection parameters of double rail vibration absorber on rail corrugation was analyzed.Moreover,the connection parameters of double rail vibration absorber were fitted with multiple parameters based on least square method and the optimal solution was obtained by particle swarm optimization algorithm.The real part of the complex eigenvalue of the wheel-rail-vibrator system with connected parameters after parameter optimization was smaller,which was 33.683,compared with that before and after parameter optimization.In other words,the double rail vibration absorber has two frequency ranges,which can well suppress multiple unstable frequencies of the wheel-rail system,and obtain better effect on rail corrugation suppression.Besides,reducing the connection stiffness and increasing the connection damping of the double rail vibration absorber can improve the suppression effect on rail corrugation.When the vertical stiffness of the lower mass block of the double rail vibration absorber is 22.7×107 N/m,the vertical stiffness of the upper and lower mass block is 1.856×107 N/m and the damping of the absorber is 6 N·s/m,the corrugation of the rail can be suppressed more effectively.
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