Method for measuring locking rail temperature based on overall change of steel rail modal
A technology for locking rail temperature and rail, which is applied in the measurement of heat, the application of measuring devices, thermometers, etc., can solve the problems of huge model workload, theoretical method not having engineering feasibility, etc., to reduce workload, simple operation, application wide range of effects
Active Publication Date: 2021-09-28
SHENYANG JIANZHU UNIVERSITY
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Problems solved by technology
However, even if it is technically feasible to build the same model as the track structure in service, there are differences in the track structure in different sections. In order to measure the longitudinal force of the rail in any section, the workload of the built model will be huge, which leads to theoretical method is not engineering feasible
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[0049] Use 3 vibration sensors, 1 railway-specific temperature sensor, 1 force hammer and 1 set of signal test and analysis system. First, the vibration sensors are arranged at equal intervals in the neutral layer of the same span of the rail to measure the lateral vibration. The excitation points are distributed at equal intervals in adjacent spans, a total of 5 points; point by point, multiple hammering. The temperature sensor is arranged on the rail to measure the real-time rail temperature. Test scenarios such as figure 2 shown.
[0050] Then, carry out the rail tension test. The details of the rail used are as follows: type 60 rail, 35 meters in length, one end is fixed, the other end is free, and the free end can be stretched; the torque of the fastener is 120N·m. Use a stretching machine to apply different tensions to simulate changes in rail temperature, and attach strain gauges to the rail waist to read the internal stress. The simulated rail temperature changes ...
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The invention discloses a method for measuring a locking rail temperature based on overall change of a steel rail modal, and solves the problems that the interference of human factors is large and the influence of the change of rail parameters on the natural vibration frequency of a steel rail cannot be ignored in the prior art. The method comprises the following steps: establishing a mapping relation between longitudinal force and a steel rail mode through a modal experiment to form a relational digital dictionary, and selecting any area on a service steel rail to carry out the modal experiment to obtain a multi-order vibration mode of the steel rail; and matching the actually measured steel rail vibration mode with the steel rail mode under zero longitudinal force in the digital dictionary, further calculating the longitudinal force of the steel rail, and finally measuring the locking temperature of the steel rail. According to the method for measuring the locked rail temperature, the influence of rail parameters can be eliminated by using the overall change of the rail mode, and the workload of measuring the longitudinal force by using the rail vibration characteristics is greatly reduced. The method is easy to operate, not affected by track parameters, free of damage to structural stability of an existing track, efficient, feasible, accurate in calculation and wide in application range.
Description
technical field [0001] The invention belongs to the technical field of rail health detection, and in particular relates to a method of measuring and locking based on the overall change of the rail mode, which is simple in operation, not affected by rail parameters, without destroying the structural stability of the existing rail, efficient, feasible, accurate in calculation, and wide in application. rail temperature method. Background technique [0002] With the improvement of driving speed, the train needs to have better stability and safety, and the seamless track rail has become the main track form of the current track line. However, because the rails are laid out in the field all year round, the temperature difference is large throughout the year, and they are affected by the impact force of the wheels and rails, and a large longitudinal force will be accumulated inside. If the longitudinal tension is too large, the rail will be broken; if the longitudinal pressure is t...
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IPC IPC(8): G01L1/10G01K13/00
CPCG01L1/10G01K13/00Y02T90/00
Inventor 岳国栋董京
Owner SHENYANG JIANZHU UNIVERSITY