Driving safety test system on high-speed railway bridge under earthquake

Abstract

The invention discloses a driving safety test system on a high-speed railway bridge under an earthquake, relates to the field of train safety performance testing, and includes a driving test system. The driving test system includes an acceleration section, a test section and a deceleration section connected in sequence; A model train is placed; a data acquisition system is arranged on one side of the test section, and the data acquisition system and the driving test system are respectively connected to a synchronous control system; the acceleration section can accelerate the model train to a test speed greater than 20m / s. Speed; the test section can use a shaking table to input seismic excitation; the deceleration section can decelerate the model train to a standstill. The invention can realize the functions of short-distance acceleration of model trains to test speed, high-speed driving test on bridges, synchronous reproduction of earthquake excitation and short-distance deceleration and braking in the laboratory, and has the advantages of millisecond-level synchronous control and millimeter-level configuration control, etc. .

Description

technical field [0001] The invention relates to the field of train safety performance testing, in particular to a driving safety test system on high-speed railway bridges under earthquakes. Background technique [0002] At present, my country's high-speed railway construction and operation are facing many challenges and risks, such as complex geological conditions, changing climate environment, railway durability over time, strong wind and sudden earthquake dynamics, etc. my country is located between the circum-Pacific seismic belt and the Eurasian seismic belt. It is an earthquake-prone country with frequent seismic activities. The previous strong earthquakes have caused serious economic losses and casualties to our country, and they will also cause damage to railway lines and even interruption of traffic. In recent years, my country's high-speed railway network has been planned in eight vertical and eight horizontal directions, with a total mileage of more than 30,000 ki...

AI Technical Summary

Problems solved by technology

[0003] There are many technical difficulties in the safety test research on the high-speed railway bridge under the action of earthquake: (1) Difficulty in short-distance acceleration

Due to the high speed of the high-speed train, the speed of the model train in the laboratory needs to reach 20m / s after scaling down, and because the space in the laboratory is limited, the mass of the model train is relatively large, and the acceleration scheme of the model train using gravity inertia in the existing patents or obtained The speed of the model train is too low, or the site required is large enough, and it is difficult to accelerate the model train to the higher speed required for the test in a short distance

(2) Synchronous control is difficult

Since the shaking table array system in the laboratory is composed of discrete shaking tables, and the test length is limited, the model train usually accelerates to the test speed in the static acceleration section before entering the test section. The test section is located in the shaking table array system. In the test, there is a movement amount, and it is difficult to center the track in the static acceleration section and the moving test section. The two need to be separated and disconnected when the model train is on the bridge, and then the test section starts to move. At the same time, the shaking table array It is necessary to start playing seismic waves synchronously. The disconnection of the acceleration section and the deceleration section and the start-up of the shaking table require high synchronization accuracy, which is not considered in the existing patent scheme

(3) It is difficult to control the smoothness and accuracy of the model track

The irregularity of the high-speed rail track is required to be within 3mm. Assuming a geometric scale ratio of 1:10 is used, the irregularity of the model track needs to be controlled within 0.3mm. Existing patented solutions cannot meet such high-precision track smoothness control requirements

(4) Difficulty in safe and non-destructive recycling of model trains

Model trains are produced with high precision, and are usually equipped with high-precision sensors for testing. The overall production cost is expensive, and they need to be safely recycled after the test. A scaled-down single-section model train usually weighs 500kg, and the speed can reach 20m / s. High speed and high quality It is a difficult problem for the model train to be recovered safely in a short distance in the laboratory. The gravity-inertial deceleration scheme adopted in the existing patent is only suitable for small mass and low speed or requires sufficient deceleration length

The above-mentioned difficulties limit the relevant experimental research in the laboratory for driving on bridges under earthquakes

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