1、 Background

The development of China's rail transit from the initial tram system to modern high-speed railways and subway systems demonstrates China's rapid development and technological progress in the field of rail transit. The development process of China's rail transit, from tram in the early 20th century to high-speed railway and subway networks in the 21st century, not only reflects technological progress, but also reflects the support of national policies and the improvement of people's living standards.

The country has specially formulated relevant standard specifications GB/T 14894-2005 "Rules for Inspection and Testing of Urban Rail Transit Vehicles after Assembly" to safeguard the rail transit system. The updating of standards can enhance the standardization of testing, unify the inspection and testing methods and requirements for the same or similar items of each vehicle model, effectively verify vehicle performance and assembled vehicle quality, reduce personnel and property losses in the later stage, and improve the quality of urban rail transit vehicle operation services.


The standard provides the following provisions for the braking distance test method of rail vehicles:


2、 Test plan

In response to the braking performance testing method in the national standard GB/T 14984-2005, combined with the operating environment of our rail vehicles, such as shuttling between cities and being affected by high-rise buildings and tunnels, GPS testing cannot be used to achieve various measurements. Therefore, we provide a train performance testing scheme based on optical speed sensors, which mainly includes optical speed sensors and DEVOC NEX DAQ data acquisition:

(1) Dewetron NEX DAQ data acquisition system: 8-channel analog input channel, 2-channel CAN/CAN-FD input, 200 KS/s sampling rate, professional Oxygen software testing package.

(2) OMS4 optical sensor: 1000Hz sampling rate, precise speed measurement, integrated IMU module, suitable for various testing road surfaces, asphalt, gravel, moisture, snow, etc.



The OMS4 optical sensor is combined with the Dewatron NEX DAQ data acquisition system. Through a professional Oxygen application, all brake measurement signals, such as brake distance, MFDD, brake departure time, etc., can be displayed online, generate charts, and automatically generate test reports after measurement.




3、 Conclusion

For rail transit vehicles such as high-speed rail, intercity, and subway, the complexity of their operating environment, such as uneven tracks, multiple high-rise buildings and tunnels during operation, and the inability to use GPS testing, is not conducive to the performance testing of rail transit vehicles. By using the OMS4 optical speed sensor, train speed, acceleration, and vehicle attitude data can be accurately measured on slippery, sandy, and even snowy roads. Combined with NEX DAQ data acquisition and analysis software, it is very suitable for various performance tests of rail transit vehicles in China.

If you are interested in our products, please call Guangzhou Zeer Testing Technology Co., Ltd. for detailed product information.

Guangzhou Zeer Testing Technology Co., Ltd

Phone: 0086-20-38104042

Email: info@zeer.com.cn

Website: www.zeer.top