Simulation study on dynamic performance of the hot

Simulation Research on dynamic performance of 200km/h EMU

Abstract: This paper is a cooperative research work of dynamic simulation of 200km/h EMU carried out by China Academy of Railway Sciences (cars) and Japan Railway Integrated Technology Research Institute (RTRI). Cars adopts AMS and NUCARS general procedures, and RTRI adopts self-developed procedures. The vehicle structure parameters calculated by simulation are proposed by cars according to the actual application, and the actual measured line irregularity data are used. Through simulation calculation and dynamic performance test of Beijing ring test line, the single vehicle dynamics model is checked and confirmed, and the influence of different simulation models and different analytical methods on vehicle dynamics simulation results is discussed. Based on adam/rail template product modeling technology, a six car dynamic model is established, and longitudinal shock absorbers are set between vehicles. The batch processing method is applied to calculate and analyze the multi vehicle model, and the influence of longitudinal shock absorber on the dynamic performance of 200km/h EMU is studied. The research shows that the longitudinal shock absorber can improve the lateral dynamic performance of 200km/h EMU

key words: 200km/h EMU dynamic model numerical simulation workshop shock absorber

1 preface

at present, the simulation calculation of vehicle system dynamics mostly adopts single vehicle model. In fact, railway vehicles operate in the form of train formation, and more and more high-speed trains are equipped with various damping connections between vehicles. Therefore, establishing a reliable and practical multi vehicle model is an important work of the current railway vehicle system dynamics simulation research

China Academy of Railway Sciences (cars) and Japan Railway Integrated Technology Research Institute (RTRI) carried out a cooperative research on "high-speed vehicle operation simulation" during, and China Puzhen rolling stock factory and Tangshan rolling stock factory participated in the work of the project. In the cooperative research, cars and RTRI fully exchanged and discussed the basic theory and modeling method of establishing vehicle system dynamics simulation model. On the basis of confirming the single vehicle dynamic model, cars adopts AMS and NUCARS programs, and RTRI adopts the self-developed program. For the purpose of the actual application of 200km/h passenger car bogie, using the exact same vehicle parameters and the measured geometric irregularity data of the line, the dynamic simulation calculation of the multi vehicle model of six vehicles is completed respectively

in December, 2002, the dynamic test of the double deck passenger car with cars200 bogie developed by Puzhen rolling stock factory was carried out on Beijing ring road. The cooperative members of cars and RITI project participated in the experiment of the roundabout. According to the actual structure data of the prototype and the measured Beijing ring line line data, cars and RITI carried out simulation calculation again in 2003, and compared with the test results

2 vehicle and track model

the simulation calculation model takes the 200km/h Trailer bogie as an example (hereinafter referred to as cars200). The bogie is equipped with anti rolling torsion bar, air spring with damping hole and bolster free form. The calculation adopts LMA wheel tread and T60 track of China Railway. The geometric irregularity of the line comes from the measured data of Beijing circular test line of China Academy of Railway Sciences. The wheel rail friction coefficient is 0.35. Table 1 mass, inertia and center of gravity height of main components of cars200

Figure 1 CAD model of cars200 bogie

Figure 2 CAD model of wheel and rail of cars200

Figure 3 wheel tread (LMA) of cars200

Figure 4 T60 rail surface shape

Figure 5 ams/rail template model of cars200

Table 2 mechanical parameters of track structure recommended by RTRI

Figure 6 N in cars200 single car is called deformation strengthening index, K is called the deformation strengthening coefficient assembly model

Figure 7 test value of track irregularity of the ring test line ()

3 main calculation results of single vehicle model

cars and RTRI compared the calculation results of speeds of 160km/h and 240km/h. The vehicle acceleration, wheel rail force and derailment coefficient calculated by both parties are basically the same, and individual vibration waveforms and details are different. In December, 2002, a dynamic performance test of cars200 was carried out on the Beijing loop test line. After the test, cars and RTRI carried out dynamic simulation calculation again, and the calculated results were compared with the test results

figure 8 test results of wheel rail lateral force

Figure 9 calculation results of wheel rail lateral force

Figure 10 comparison of calculation and test results of vehicle body lateral acceleration PSD

Figure 11 comparison of calculation and test results of vehicle body vertical acceleration PSD

Table 3 RMS of vehicle body acceleration and St

Table 4 RMS of wheel/rail lateral force

4 Basic method of establishing multi vehicle model

4.1 vehicle body template of multi vehicle model

ams/rail is a dynamic simulation software package based on template products, which uses template products to generate subsystems and subsystems to assemble system models. This model building method is conducive to the automatic generation and establishment of train system dynamics model with standard bogie and body templates. However, due to various reasons, the research work of applying ams/rail to multi vehicle computing has made slow progress

ams/rail has many methods and ways to establish multi vehicle model. It is a shortcut to follow the template product idea designed by AMs

the train is coupled through the car body, and the correct creation of the car body template of the multi car model is the key to the establishment of the multi car model. Users need to accurately understand and apply the two important concepts of ams/rail connector (communicator) and vehicle serial number (wagon order)

connectors are used for information exchange and transmission between different subsystems. It enables multiple subsystems to integrate the large-scale system model designed for users according to the predetermined connection order and interaction relationship

there are two types of connectors: input communicators (the company uses internally manufactured sample pieces for control test (similar to STM 4501 block shear test)) and output communicators. Input connectors are used to obtain information from other subsystems. The output connector is used to provide information to other subsystems

in order to establish a multi vehicle model, first create three body templates of the head vehicle, the middle vehicle and the tail vehicle in ams/rail template builder:

● input connectors are set on the body template of the head vehicle to access subsequent vehicle information

● input and output connectors are set on the body template of the intermediate vehicle at the same time. The output connector provides information for coupling the front vehicle, and the input connector provides information for connecting the rear vehicle

● the output connector is set on the body template of the tail car to provide information for coupling the front car

Figure 12 schematic diagram of vehicle serial number and workshop connector

4.2 subsystem of multi vehicle model

using three body templates of head vehicle, middle vehicle and tail vehicle, subsystem of multi vehicle model can be created in ams/rail standard interface

when generating the subsystem of multi vehicle model, it is necessary to specify the vehicle serial number for each vehicle in the order from front to back. Ams/rail arranges the geometric position of the vehicle through the vehicle serial number, finds the connection relationship between the front and rear, and assembles the multi vehicle system model

the initial mileage coordinates of each vehicle are specified when generating the subsystem. Table 12.2 shows the data of cars and RTRI used in the 6-car calculation model. Table 5 6 vehicle serial number and initial coordinates of vehicle model (unit: m)

4.3 set AMS memory parameters, assemble multi vehicle model

before system assembly on the basis of multi vehicle model subsystem, AMS environment parameters should be detected and memory mode should be reset. AMS provides several standard memory modes for users to choose from

for large-scale multi vehicle models, the user-defined memory mode should be selected. The specific steps are as follows:

(1) click, select "program" - "ftware" - "ams2003" - "Settings", and the AMS setting dialog box appears on the screen (Figure 13)

(2) set "memory model (view)" and "memory model (Solver)" to usedefined according to the needs of the model

(3) start MS visual studio and select "open workspace"

(4) open the target file c:program filesams2003win32uconfg_ Userw

(5) file uconfg f. Adjust memory parameters as needed

(6) press F7 to compile and generate L

in this way, the setting of user-defined memory parameters is completed. It usually needs to be debugged several times to get the appropriate memory setting parameters to ensure the smooth assembly and calculation analysis of the multi vehicle model

Figure 13 am graphics/memory settings dialog box

Table 6 standard memory mode provided by AMS

Table 7 parameters of AMS memory mode

Figure 14 6-car dynamic model assembled

4.4 simulation calculation of multi car model by batch processing

simulation calculation of multi car dynamics by ams/rail, with long calculation time and huge amount of output data. For effective analysis, AMS batch mode can be used, and the output options can be strictly controlled

to execute the batch processing method, first select "files only" in "submitting analysis", so that the analysis file with the specified name can be written in the working directory, such as cars01_ 120。 Ams/rail generates the following three cars01_ 120 file:

● cars01_ M - model file of ams/solver

● CARS01_ F - command file of ams/solver

● CARS01_ M- ams/rail output setup model file

multiple analysis files are generated in this way. Then, a batch file that runs multiple analysis tasks, such as multi_ run . Bat:

execute multi under MSDOS_ t. AMS automatically completes the eight analysis small panel control systems in the above example under the background operation mode, and its responsibility is to make the equipment work efficiently. After all batch calculation tasks are completed, you can re-enter the graphical interface of s/rail with stable growth of AM export to post process the calculation results

5 influence of workshop longitudinal shock absorber on the dynamic performance of 200km/h EMU

5.1 set workshop longitudinal shock absorber in the multi vehicle model

according to the actual application of Shinkansen high-speed train, cars and RTRI set the longitudinal shock absorber between vehicles in the cooperative research model to study the influence of workshop shock absorber on the dynamic performance of the train. According to the recommendations of RTRI, the damping moment of the two workshops is 5.12mnms

Figure 15 schematic diagram of workshop longitudinal shock absorber set in the multi vehicle model

5.2 impact of workshop longitudinal shock absorber on the dynamic performance of 200km/h EMU

according to the simulation results and the actual use of Shinkansen in Japan, the following conclusions are reached:

(1) the improvement effect of workshop longitudinal shock absorber on the lateral dynamic performance of high-speed EMU is about 20%

(2) the longitudinal vibration damper in the workshop is obviously helpful to improve the longitudinal dynamic performance of high-speed EMUs

(3) the longitudinal vibration damper in the workshop has no obvious effect on the wheel rail function of high-speed EMU

Figure 16 calculation results of lateral acceleration of vehicle body with and without workshop longitudinal shock absorber

Figure 17 influence of workshop longitudinal shock absorber on lateral acceleration of vehicle body

6 summary

(1) comparative analysis of simulation calculation of different mechanisms and programs is enlightening. The European Institute of Railway Technology (ERRI) has organized a comparison in this regard, with as many as 18 participating units. In the cooperative research, cars and RTRI can evaluate the impact of different simulation models and different analytical methods on vehicle dynamics simulation results by analyzing and comparing the calculation results of both sides

(2) ams/rail has good multi vehicle model analysis and calculation ability. After understanding and mastering the basic concepts and model assembly skills of AMS template products, ams/rail can be used for high-speed train dynamics simulation calculation

(3) the longitudinal shock absorber in the workshop can be changed