CN111537246B

CN111537246B - High-speed railway bridge up-driving safety test system under earthquake

Info

Publication number: CN111537246B
Application number: CN202010315746.7A
Authority: CN
Inventors: 余志武; 国巍; 蒋丽忠; 刘汉云; 龙岩
Original assignee: Central South University; National Engineering Laboratory for High Speed Railway Construction Technology
Current assignee: National Engineering Research Center Of High Speed Railway Construction Technology; Central South University
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2021-10-15
Anticipated expiration: 2040-04-21
Also published as: CN111537246A

Abstract

The invention discloses a driving safety test system on a high-speed railway bridge under an earthquake, which relates to the field of train safety performance test and comprises a driving test system, wherein the driving test system comprises an acceleration section, a test section and a deceleration section which are sequentially connected; a model train is placed on the driving test system; 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 with a synchronous control system; the acceleration section can accelerate the model train to a test speed of more than 20 m/s; the test section can adopt a vibration 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 the model train to the test speed, high-speed driving test on the bridge, synchronous reproduction of earthquake excitation, short-distance deceleration braking and the like in a laboratory, and has the advantages of millisecond-level synchronous control, millimeter-level configuration control and the like.

Description

High-speed railway bridge up-driving safety test system under earthquake

Technical Field

The invention relates to the field of train safety performance testing, in particular to a safety test system for a high-speed railway bridge on an earthquake.

Background

At present, the construction and operation of high-speed railways in China face a plurality of challenges and risks, such as complex geological conditions, changeable climatic environments, railway durability over time, strong wind and sudden earthquake dynamic action and the like. China is located between the Pacific earthquake zone and the Eurasian earthquake zone, belongs to the countries with multiple earthquakes, and has frequent earthquake activities. The strong earthquake all the time causes serious economic loss and casualties in China, and can also cause railway lines to be damaged and even cause traffic interruption. In recent years, the highway network of China is planned with eight longitudinal lines and eight transverse lines, the total mileage is over 3 kilometers, and in order to meet the requirement of driving smoothness, the bridge has higher line occupation ratio. The high-speed railway line can inevitably cross an earthquake zone or be built along the earthquake zone, the probability of the high-speed train running on the bridge is greatly increased when an earthquake occurs, and the research on the safety of the high-speed train operation under the sudden earthquake is very necessary. However, due to the paroxysmal, destructive and unpredictable nature of earthquake, it is difficult to predict the precious data of the vehicle driving under earthquake when or how to measure the earthquake through actual earthquake damage, the test data of high-speed rail under earthquake is rare in the world, and the earthquake damage data of high-speed rail in China is almost blank. In order to avoid serious accidents such as derailment of a high-speed rail, line interruption and the like when a strong earthquake occurs in the future, besides theoretical research and numerical simulation, laboratory tests of a system are urgently needed to be carried out to obtain key data and verify the effectiveness of a theoretical numerical model.

The safety test research of the shape of the high-speed railway bridge under the action of earthquake has a plurality of technical difficulties: (1) short-range acceleration is difficult. Because the high-speed train is high in speed, the speed of the model train in the laboratory needs to reach 20m/s after the scale is reduced, and because the field in the laboratory is limited, the quality of the model train is high, the speed of the obtained model train is too low or the required field is wide enough in the existing patent scheme for accelerating the model train by adopting gravity inertia, and the model train is difficult to accelerate to the higher speed required by the test in a short distance. (2) The synchronization control is difficult. Because the vibration table array system in the laboratory consists of discrete vibration tables and can provide limited test length, a model train can enter a test section after being accelerated to a test speed in a static acceleration section generally, the test section is on the vibration table array system, the motion amount exists in the test, the static acceleration section and the moving test section are difficult to align, the model train is required to be separated from and disconnected from the bridge at the moment, then the test section starts to move, meanwhile, the vibration table array needs to synchronously start playing seismic waves at the moment of bridge mounting on the model train, the synchronous precision requirements of the disconnection of the acceleration section and the deceleration section and the starting of the vibration tables are high, and the existing patent scheme is not considered. (3) And the smoothness and precision of the model orbit are difficult to control. The requirement of the irregularity of the high-speed rail is within 3mm, and if a geometric scaling ratio of 1:10 is adopted, the irregularity of the model rail needs to be controlled within 0.3mm, so that the requirement of smooth control of the high-precision rail cannot be met by the existing patent scheme. (4) The model train is difficult to safely and nondestructively recover. The model train is high in manufacturing precision, a high-precision sensor for testing is usually arranged, the whole manufacturing cost is high, the model train needs to be safely recovered after testing, a single section of the reduced model train usually weighs 500kg, the speed can reach 20m/s, the short-distance safe recovery of the high-speed and high-mass model train in a laboratory is difficult, and the gravity inertia speed reduction scheme adopted by the existing patent is only suitable for small-mass and low-speed or needs enough speed reduction length. The above difficulties limit the development of experimental studies related to driving on the bridge under the action of earthquake in laboratories.

Disclosure of Invention

The invention aims to provide a safety test system for driving on a high-speed railway bridge under an earthquake, which is used for solving the problems in the prior art, improving the track control precision and accurately testing the speed safety limit value of driving on the bridge and the relation between the speed safety limit value and the earthquake intensity.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a driving safety test system on a high-speed railway bridge under an earthquake, which comprises a driving test system, wherein the driving test system comprises an acceleration section, a test section and a deceleration section which are sequentially connected; a model train is placed on the driving test system; 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 with a synchronous control system; the acceleration section can accelerate the model train to a test speed of more than 20 m/s; the test section can adopt a vibration table to input seismic excitation; the deceleration section can decelerate the model train to a standstill.

Optionally, the acceleration section comprises a servo motor driving system, an acceleration guiding system, a joining track system, a first support steel frame system, a servo motor, an acceleration push plate and a servo actuator; guide system is fixed set up in first support steel frame system top with higher speed, guide system bilateral symmetry is provided with servo motor actuating system with higher speed, servo motor actuating system including set up in the drive chain of guide system both sides with higher speed, the closed winding in drive chain both ends has the drive wheel, guide system front end is provided with the push pedal with higher speed, and the rear end is articulated to have link up track system, keep away from push pedal one end with higher speed the drive wheel has through motor shaft swing joint servo motor, servo motor is last to be installed servo actuator, servo actuator's expansion end with link up track system's bottom slope is connected, link up the end of track system and be used for being connected with the test section.

Optionally, the test section comprises a vibration table array system, a pier supporting rigid beam system, a reduced scale model bridge system, a reduced scale model track system and a laboratory site platform; the plurality of vibration table vibration systems are uniformly arranged on the laboratory site platform, a plurality of reduced scale model bridge systems are uniformly arranged on the vibration table array system of the vibration table array system, the reduced scale model track systems are horizontally paved on the reduced scale model bridge systems, the pier supporting rigid beam system is connected between two adjacent vibration table array system vibration table array systems, and the pier supporting rigid beam system is connected with the bottom of the reduced scale model track system; and the tail end of the joining track system is used for being connected with one end of the reduced scale model track system.

Optionally, the deceleration section comprises a second support steel frame system, a hydraulic damping system, a deceleration guide rail system and a deceleration net; the speed reduction guide rail system is horizontally arranged on the second support steel frame system, and the speed reduction nets are arranged on two sides of the speed reduction guide rail system; one end of the speed reduction guide rail system is connected with the reduced scale model rail system, and the other end of the speed reduction guide rail system is provided with the hydraulic damping system.

Optionally, the synchronous control system includes a workstation and a display electrically connected, and the workstation is electrically connected to the servo motor, the vibration table array system of the vibration table array system, and the data acquisition system, respectively.

Optionally, the data acquisition system includes a data acquisition box, a wireless acceleration sensor, a laser displacement meter, a high-speed video camera and a camera support frame; the data acquisition box is respectively and electrically connected with the wireless acceleration sensor, the laser displacement meter, the high-speed camera and the workstation; the high-speed camera is arranged on a camera support frame, and the camera support frame is arranged on one side of the test section; the laser displacement meter is arranged at the bottom of the carriage of the model train, which is over against the reduced scale model track, so that the model train stably runs at a low speed before the test, and the laser displacement meter scans the model track at a fixed distance to obtain the data of the track surface of the model track, thereby obtaining the irregularity data of the actually measured model track; the wireless acceleration sensor is arranged on the train body, the bogie or the wheel set of the model train and is used for measuring the displacement and the acceleration of the train body, the bogie and the wheel set of the model train.

Optionally, the vibration table array system includes a plurality of vibration tables arranged on the same straight line, and each vibration table can realize three-direction six-degree-of-freedom seismic excitation.

Optionally, the tread contour proportion of the reduced steel rail model and the wheel set model is kept unchanged, so that the actual wheel-rail contact relation can be accurately simulated; after the scale is reduced, the geometric sizes of the model track and the model wheel are small, and the requirement of high manufacturing precision after the track is not smooth and the scale is reduced is met; i-shaped safety guide rails are paved on the track plates of the reduced scale model track system to prevent the train from derailing under extreme working conditions.

Optionally, the bridge system, the track system and the model train in the test section are similarly designed according to a certain geometric scaling ratio, the design requirement of the model test similarity rate is strictly met, the connection between the acceleration section and the test section requires millimeter-scale manufacturing precision, and the model train jumping phenomenon cannot be generated; the model rail system of experimental section satisfies the recurrence required precision of the unsmooth millimeter level of track behind the reduced scale, and reduced scale model rail system is provided with the track and connects the fastener, connects the fastening bolt on the fastener through adjusting the track, realizes the accurate regulation and control of the orbital millimeter level of reduced scale model for the system has millimeter level configuration control accuracy.

Compared with the prior art, the invention has the following technical effects:

the connection of the acceleration section and the test section needs millimeter-scale manufacturing precision, the phenomenon of model train jumping cannot be generated, the test section meets the requirement of millimeter-scale reproduction precision of unsmooth tracks after the scale is reduced, and the system has millimeter-scale configuration control precision; the millisecond-level synchronous control is realized, because the model train has high running speed and the bridge structure length of the test section is limited, the effective test time at a high speed of more than 20m/s in the test is often several seconds, the waste of any time is very bad at the moment, meanwhile, because of the test requirement, the synchronization of the input of seismic waves, the data acquisition and the measurement of the speed of the model train must be ensured, and the high-precision synchronous control is realized.

The scale model has higher requirements on manufacturing precision, particularly for the unsmooth part of a track, the corresponding model is usually in the level of 0.1mm, at the moment, some adjusting devices are required to be arranged between a lower support and the track to realize the precision adjustment of the track, the track is tested and determined before experiments, meanwhile, the displacement control precision of a vibration table is higher in requirement, otherwise, the introduction of background noise can cause larger recurrence errors and even exceed the influence of the unsmooth, the invention provides and adopts a millimeter-level configuration control thought, and the invention designs a millimeter-level adjustable design thought: the connection fastener that sets up in the scale model track system is used for adjusting the track irregularity, subtracts last fastening bolt through adjusting the connection fastener, can realize the accurate regulation and control of the orbital millimeter level of scale model, and shaking table control system adopts the three parameter control strategies based on displacement, speed and acceleration simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a flow chart showing the construction and test of a driving safety test system on a high-speed railway bridge under an earthquake;

FIG. 2 is a schematic diagram of the general overview of the system for testing the safety of vehicles traveling on the highway bridge under earthquake;

FIG. 3 is an overview of an acceleration segment;

FIG. 4 is a perspective assembly view of the acceleration section;

FIG. 5 is a schematic diagram of the experimental section;

FIG. 6 is a perspective assembly view of a trial;

FIG. 7 is a schematic view of the deceleration section;

FIG. 8 is a perspective assembly view of the deceleration section;

FIG. 9 is a model train overview;

FIG. 10 is a wiring overview of the synchronous control system;

FIG. 11 is a wiring overview of the data acquisition system;

wherein, 1 is an acceleration section, 101 is a servo motor driving system, 102 is an acceleration guiding system, 103 is a joining track system, 104 is a first supporting steel frame system, 105 is a servo motor, 106 is an acceleration push plate, 107 is a servo actuator, 2 is a test section, 201 is a vibration table array system, 202 is a pier supporting rigid beam system, 203 is a reduced scale model bridge system, 204 is a reduced scale model track system, 205 is a laboratory site platform, 3 is a model train, 4 is a deceleration section, 401 is a second supporting steel frame system, 402 is a hydraulic damping system, 403 is a deceleration guide rail system, 404 is a deceleration net, 5 is a data acquisition system, 501 is a first workstation, 502 is a data acquisition box, 503 is a display, a keyboard, a mouse and other peripheral equipment, 504 is a wireless acceleration sensor, 505 is a laser displacement meter, 506 is a high-speed video camera, 507 is a camera supporting frame, reference numeral 6 denotes a synchronization control system, 601 a second workstation, and 602 a display.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The invention provides a safety test system for driving on a high-speed railway bridge under an earthquake, which is built by relying on an existing vibrating table array system, considers the performance parameters of the vibrating table, such as the table size, the maximum load of the table, the maximum driving speed and the like, adopts a certain scale ratio to carry out similar design, and adopts a high-speed railway model as a prototype vehicle. The test section device comprises shaking table array system, reduced scale model bridge system, reduced scale model track system etc. and the reduced scale model has higher requirement to the preparation precision, especially track irregularity part, and corresponding model often is at the 0.1mm rank, sets up the track connection fastener in the reduced scale model track system, through adjusting the fastening bolt on the connection fastener, realizes the accurate regulation and control of the orbital millimeter level of reduced scale model. And meanwhile, an I-shaped safety guide rail is paved on the track plate of the reduced scale model track system to prevent the train from derailing under extreme working conditions. Meanwhile, a connecting track system in the train acceleration section is used as a transition section of the acceleration section and the test section, the train track and the overturning guide rail are centered with the test section through a locking device, the model train in acceleration motion can be guaranteed to accurately enter the test section all the time, the problem of centering of the acceleration section and the test section track is effectively avoided, meanwhile, millisecond-level unlocking connection is carried out on the model train after the test section, the test section track is guaranteed not to be influenced by the acceleration track in the test process, and millisecond-level synchronization of the system is achieved. The whole test device can realize the accuracy verification of a numerical model and an algorithm of a vehicle-rail-bridge system with an added track being not smooth, can obtain the speed safety limit value of the vehicle running on the bridge and the relation between the speed safety limit value and the earthquake intensity through the test, provides a safe and reliable test platform for the vehicle running test on the high-speed train bridge under the earthquake action, and provides a test platform for the safety and prevention and control technology of the vehicle running on the bridge.

The high-speed camera adopted in the invention is used for collecting the displacement and the acceleration among the reduced-scale model bridge, the model train and the wheel rail in the test process, is arranged at one side of the driving test system, ensures that the visual angle of the camera is fully utilized, fully considers the coverage of the blind area of the camera and ensures that the whole monitoring process is not omitted. The wireless acceleration sensor is arranged on the model train body, the bogie and the wheel set and is used for measuring the displacement and the acceleration of the model train body, the bogie and the wheel set. The laser displacement meter is arranged at the bottom of the carriage, over the model train, of the carriage, the model train runs stably at a low speed before the test, and the laser displacement meter scans the model track at a fixed distance to obtain the rail surface data of the model track, so that the irregularity data of the actually measured model track is obtained.

Specifically, as shown in fig. 1, it is a flow chart of the composition and test of the bridge-descending and vehicle-ascending system under the action of earthquake, and the system composition and test flow are summarized as a whole. Whole test system includes model train 3, acceleration section 1, test section 2, deceleration section 4, data acquisition system 5 and synchronous control system 6, and wherein acceleration section 1 contains the linking section, and the linking section is including linking track system 103, links up track system 103 and test section 2 and supports jointly on existing shaking table array system 201. In the test process, the model train 3 sequentially passes through the acceleration section 1, the joining track system 103, the test section 2 and the deceleration section 4, and the data acquisition system 5 and the synchronous control system 6 are responsible for whole-process data acquisition and system control.

Fig. 2 is a schematic view of a part of the on-bridge train test system, which includes an acceleration section 1, a test section 2, a model train 3, a deceleration section 4, a data acquisition system 5 and a synchronous control system 6, wherein the relative position diagram of each constituent subsystem is shown, and the data acquisition system 5 can be flexibly arranged according to the requirement of test data acquisition. In the test, the model train 3 needs to reach a predetermined test speed before entering the test section 2, so the model train needs to be accelerated by an accelerating device of the accelerating section 1. The acceleration section 1 accelerates the model train 3 to a speed required by the test within a short distance by the arranged servo motor driving system 101, and then enters the test section 2 through the joining track system 103. The linking track system 103 ensures that the model track between the acceleration section and the deceleration section is centered through the locking device, and simultaneously, the test section on the model train is in instantaneous millisecond-level unlocking connection, so that the test section track is not influenced by the acceleration section track in the test process, the linking track system 103 is disconnected at the moment when the model train 3 running at high speed enters the test section 2, and at the moment, the linking track system 103 sends a disconnection state message to the whole control system 6. The control system 6 synchronously sends a starting instruction to the vibration table array system 201, and the vibration table array system 201 synchronously starts to play the test seismic waves which are processed and stored in advance. The test seismic waves are selected from a strong earthquake database or generated manually according to parameters such as field types, field distances, earthquake intensity levels and the like, and are stored in the vibration table array system 201 of the vibration table array system after being adjusted by a time scale and an amplitude value. The vibration table array system 201 of the vibration table array system transmits test seismic waves into a test section 2 through a vibration table top to realize seismic excitation, at the moment, a model train 3 starts to enter a reduced scale model track system 204 and a reduced scale model bridge system 203, meanwhile, a high-speed camera 502 and a wireless acceleration sensor 504 in a data acquisition system 5 start to acquire data, the high-speed camera 502 acquires structural deformation image data of an observation position, the wireless acceleration sensor 504 acquires acceleration time-course response data of a vehicle model, one test seismic wave corresponds to one data acquisition process in the acquisition process, the data are stored in a storage medium of the vibration table after the data acquisition is finished, the data can be read once or after a plurality of tests according to the size of the storage medium, and the data are uploaded to a first workstation 501 for subsequent data processing. The acceleration section, the test section, the deceleration section and other action sections of the whole driving test system are externally connected with a synchronous control system, the response time of the whole synchronous control system is in the millisecond level, the synchronism and accuracy of the acceleration section and the test section in time are ensured, and the system has the millisecond-level synchronous characteristic. The connection of the acceleration section and the test section needs millimeter-scale manufacturing precision, the phenomenon of model train jump cannot be generated, the test section needs to meet the requirement of reproduction precision of the unsmooth millimeter-scale track after the scale is reduced, and the system has millimeter-scale position shape control precision.

The geometric scaling ratio of the whole on-bridge traveling system is 1: other parameters were obtained by dynamic similar design criteria 10. The scale model track system 204 is connected the fastener through the track of arranging, realizes the accurate regulation and control of millimeter level to track irregularity. An I-shaped safety guide rail is arranged in the middle of the rail system, the safety guide rail is connected with the model train through a concave hook, the safety guide rail is not contacted under a normal driving state, the concave hook catches the safety guide rail under a derailing and overturning state, and the model train is prevented from falling down to damage the test equipment of the bridge model. After the test content of the model train 3 is completed on the test section 2, the model train enters the deceleration section 4, the deceleration section 4 realizes two-stage lossless capture of the model train 3 through the deceleration net 404 and the hydraulic damping system 402, and the problem that the model train is difficult to recover safely and losslessly can be solved. Fig. 3 is an overall schematic view of the acceleration section 1, fig. 4 is an exploded view of the acceleration section 1, and it can be seen from fig. 3 and 4 that the entire train acceleration section mainly includes a servo motor driving system 101, an acceleration guiding system 102, a joining track system 103, a first supporting steel frame system 104, a servo motor 105, an acceleration push plate 106, a servo actuator 107, and the first supporting steel frame system 104 is movable. The support system comprises seven track support steel frames and a motor support steel frame, and the servo motor 105 is arranged on the motor support steel frame. Fig. 5 is an overall overview of the test section 2, fig. 6 is an explosion diagram of the test section 2, it can be seen from fig. 5 and 6 that the whole test section mainly comprises a vibration table array system 201, the vibration table array system 201 is an existing conventional existing vibration table array system, the vibration table array system 201 comprises a plurality of vibration tables arranged on the same straight line, each vibration table can realize earthquake excitation of three-way six-degree-of-freedom, a pier supporting rigid beam system 202, a reduced scale model bridge system 203, a reduced scale model track system 204 and a laboratory site platform 205. Fig. 7 is an overall overview of the deceleration section 4, fig. 8 is an exploded view of the deceleration section 4, and it can be seen from fig. 7 and 8 that the entire deceleration section 4 mainly comprises a second supporting steel frame system 401, a hydraulic damping system 402, a deceleration guide rail system 403, and a deceleration net 404. Fig. 9 is an overview of a model train, and the model train 3 can be obtained by adopting vehicles of different models to perform reduced-scale and power-similarity design according to test requirements. Fig. 10 is a schematic diagram of the connection of the synchronous control system, the synchronous control system 6 includes a second workstation 601 and a display 602, the second workstation 601 is connected to the joining track system 103 and the vibration table array system 201, it controls the servo motor 105 to accelerate the model train, controls the servo actuator 107 to disconnect the joining track, and controls the vibration table array system to play the seismic waves, wherein the model train is on the bridge at the moment, the joining track is instantaneously disconnected, the vibration table is immediately started, so the control system is required to ensure the high precision millisecond synchronization between the two. Fig. 11 is a schematic diagram of a connection of a data acquisition system, as can be seen from fig. 11, the entire data acquisition system includes a first workstation 501, a data acquisition box 502, peripherals 503 such as a display, a keyboard, a mouse, etc., a wireless acceleration sensor 504, a laser displacement meter 505, a high-speed camera 506, and a camera support 507, before a test, a model train stably runs at a low speed, the laser displacement meter 505 scans a model track at a fixed distance to obtain model track surface data, thereby obtaining measured model track irregularity data, wherein the sensors include a wireless acceleration sensor and a high-speed camera, but are not limited to the above sensors, and the wireless acceleration sensor is mounted on a train body, a bogie, and a wheel set of the model train for measuring displacement and acceleration of the train body, the bogie, and the wheel set of the model train; the sensors are all connected with a data acquisition box 502, the data acquisition box 502 is connected with a workstation 501, the high-speed camera 506 and the wireless acceleration sensor 504 both carry storage cards and can store partial data, the earthquake test working conditions which can be stored by the storage cards at one time can be calculated according to the acquisition duration and the acquisition points in the test, and then the test data are led into the workstation for storage and standby.

The driving safety test system on the high-speed railway bridge under the earthquake has the characteristics of millisecond synchronous control, millimeter-scale configuration adjustability and the like, and can provide a technical scheme of the system for the driving safety related test research of the high-speed train under the earthquake action. The whole test device provides a test platform for the high-speed railway bridge traveling vehicle test under the action of an earthquake, ensures the synchronization of the input of earthquake waves, the data acquisition and the measurement of the model train speed, realizes the high-precision synchronous control, provides a test platform for the safety and prevention and control technology of the bridge traveling vehicle, provides a verification platform for the accuracy of a numerical model and an algorithm of a vehicle-rail-bridge system with unsmooth tracks, and can obtain the speed safety limit value of the traveling vehicle on the bridge and the relation between the speed safety limit value and the earthquake intensity through the test.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. High-speed railway bridge up traffic safety test system under earthquake, its characterized in that: the device comprises a driving test system, wherein the driving test system comprises an acceleration section, a test section and a deceleration section which are sequentially connected; a model train is placed on the driving test system; 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 with a synchronous control system; the acceleration section can accelerate the model train to a test speed of more than 20 m/s; the test section can adopt a vibration table to input seismic excitation; the deceleration section can decelerate the model train to be static; the acceleration section comprises a servo motor driving system, an acceleration guide system, a connection track system, a first support steel frame system, a servo motor, an acceleration push plate and a servo actuator; the acceleration guide system is fixedly arranged at the top of the first support steel frame system, servo motor driving systems are symmetrically arranged on two sides of the acceleration guide system and comprise driving chains arranged on two sides of the acceleration guide system, driving wheels are wound at two ends of the driving chains in a closed mode, an acceleration push plate is arranged at the front end of the acceleration guide system, the linkage track system is hinged to the rear end of the acceleration guide system, the driving wheel far away from one end of the acceleration push plate is movably connected with the servo motor through a motor shaft, the servo actuator is arranged on the servo motor, the movable end of the servo actuator is obliquely connected with the bottom of the linkage track system, and the tail end of the linkage track system is used for being connected with a test section; the test section comprises a vibration table array system, a pier supporting rigid cross beam system, a reduced scale model bridge system, a reduced scale model track system and a laboratory site platform; the plurality of vibration table array systems are uniformly arranged on the laboratory site platform, a plurality of reduced scale model bridge systems are arranged on the vibration table array systems, the reduced scale model track systems are horizontally laid on the reduced scale model bridge systems, the pier supporting rigid beam system is connected between every two adjacent vibration table array systems, and the pier supporting rigid beam system is connected with the bottom of the reduced scale model track system; the tail end of the engagement track system is used for being connected with one end of the reduced scale model track system; the vibration table array system comprises a plurality of vibration tables which are arranged on the same straight line, and each vibration table can realize three-direction six-degree-of-freedom seismic excitation;

the acceleration section accelerates the model train to the speed required by the test within a short distance through a distributed servo motor driving system, and then enters the test section through the connection track system; the connection track system ensures that the model track between the acceleration section and the deceleration section is centered through the locking device, simultaneously, the connection is unlocked in the instant millisecond level of the test section on the model train, the connection track system is disconnected at the instant when the model train running at high speed enters the test section, and at the moment, the connection track system sends a disconnection state message to the whole control system; the synchronous control system synchronously sends a starting instruction to the vibration table array system, and the vibration table array system synchronously starts to play the pre-processed and stored test seismic waves; the vibration table array system transmits test seismic waves into a test section through a vibration table top, seismic excitation is achieved, a model train starts to enter a reduced scale model track system and a reduced scale model bridge system at the moment, meanwhile, a high-speed camera and a wireless acceleration sensor in the data acquisition system start to acquire data, the high-speed camera acquires structural deformation image data of an observation position, the wireless acceleration sensor acquires acceleration time-course response data of a vehicle model, one test seismic wave corresponds to one data acquisition process in the acquisition process, and the data are stored in a storage medium of the vibration table array system after the data acquisition is completed and used for subsequent data processing.

2. The system for testing safety of vehicles travelling on high-speed railway bridges under earthquakes according to claim 1, which is characterized in that: the deceleration section comprises a second support steel frame system, a hydraulic damping system, a deceleration guide rail system and a deceleration net; the speed reduction guide rail system is horizontally arranged on the second support steel frame system, and the speed reduction nets are arranged on two sides of the speed reduction guide rail system; one end of the speed reduction guide rail system is connected with the reduced scale model rail system, and the other end of the speed reduction guide rail system is provided with the hydraulic damping system.

3. The system for testing safety of vehicles travelling on high-speed railway bridges under earthquakes according to claim 2, characterized in that: the synchronous control system comprises a workstation and a display which are electrically connected, and the workstation is electrically connected with the servo motor, the vibration table array system and the data acquisition system respectively.

4. The system for testing safety of vehicles travelling on high-speed railway bridges under earthquakes according to claim 3, characterized in that: the data acquisition system comprises a data acquisition box, a wireless acceleration sensor, a laser displacement meter, a high-speed video camera and a camera support frame; the data acquisition box is respectively and electrically connected with the wireless acceleration sensor, the laser displacement meter, the high-speed camera and the workstation; the high-speed camera is arranged on a camera support frame, and the camera support frame is arranged on one side of the test section; the laser displacement meter is arranged at the bottom of the carriage of the model train, which is over against the reduced scale model track; the wireless acceleration sensor is arranged on a train body, a bogie or a wheel set of the model train.

5. The system for testing safety of vehicles travelling on high-speed railway bridges under earthquakes according to claim 4, characterized in that: the tread contour proportion of the reduced steel rail model and the wheel set model is kept unchanged, and the actual wheel-rail contact relation can be accurately simulated; and an I-shaped safety guide rail is paved on the track plate of the reduced scale model track system.

6. The system for testing safety of vehicles travelling on high-speed railway bridges under earthquakes according to claim 4, characterized in that: the reduced scale model track system is provided with track connection fastener, through adjusting fastening bolt on the track connection fastener can realize the accurate regulation and control of orbital millimeter level of reduced scale model.