Toe Load Detection and Test Verification Based on the Natural Frequency of Fastener Elastic Rod
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective The insufficient toe load of the fastener elastic rod will induce loosening of the surrounding fasteners, aggravate the dynamic response between wheels and rails, affecting the service life of the track components. Compared with the missing and breaking of the fastener elastic rod, fastener elastic rod loosening is more difficult to be spotted by routine manual inspection, so the toe load detection method of the fastener elastic rods needs to be studied. Method Taking WJ-7 fastener elastic rod of high-speed railway as an example, a refined model of fastener system is established, the modal characteristics of fastener elastic rod under different toe load states are analyzed, corresponding relationship between the toe load of fastener elastic rod and the natural frequency is obtained, and a rapid non-destructive testing method for calculating the toe load by testing the modal frequency of elastic rod is proposed accordingly. The high-speed railway line at the track test base of a State Key Laboratory is selected as the test site, and the test verification of the detection method is carried out. Result & Conclusion Under different toe load states, the 1st modal shape characteristics of elastic rods all manifest as vertical vibration and torsion on both side legs of the elastic rod. The maximum absolute value of the difference ratio between the simulation value and the measured value of the elastic rod 1st order natural frequency is 3.24%, so the test method can be considered as effective.
Authors and Affiliations
Zhengxiang DING, Ziwen CAO, Mingjia LIU, Linya LIU, Zheng WEI, Zhequan HU, Rui SONG
Influence Analysis of Metro Tunnel Underground Construction on Existing Metro Station and Viaduct Pile Foundation
Objective Influence of metro tunnel closely under-passing the existing metro station and viaduct pile foundation is studied. Method Wulidun Station safety line tunnel on Hefei S1 Line closely under-passes the existing Wu...
Intelligent Health Management System for Rail Transit Signaling System Power Supply
Objective The dual-bus and dual-interruptible power supply (UPS) architecture in rail transit signaling system power supply enhances the system redundancy but does not effectively reduce component failure rates. To impro...
Assessment and Optimization Strategies of Tram Station Environment Based on Park City Scene Creation
Objective In the development context of ecological construction and new urbanization for park cities in the current new-era, the main theme is to explore the planning direction and influencing factors of urban new scene...
Influence Analysis of Suspended Monorail Track Beam on Vehicle Running Stability
Objective Influenced by the track beam, the suspended monorail vehicle is prone to yaw motion during running, which significantly affects the vehicle′s stability. Therefore, it is necessary to analyze the causes of the y...
Impact Analysis of Planning and Design Elements on Urban Rail Transit Energy Consumption
[Objective] By establishing an energy consumption model for urban rail transit, the impact of planning and design elements on its energy consumption is analyzed, so as to guide the optimization of urban rail transit plan...