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Ren S.,Beijing Jiaotong University | Ren S.,Infrastructure Inspection Center | Feng Q.,Beijing Jiaotong University | Xu G.,Infrastructure Inspection Center | And 2 more authors.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2010

The measuring principle of longitudinal level irregularity of the CP-3 type track inspection car is inertial measurement method, which means the train speed has much influence on the measuring result. Therefore according to the train speed this device is classified into three gears and adjusted manually when measurement starts. Obviously that will cause inconvenient and measuring errors. Hence the authors present a new integral measuring system which is the level accelerometer, displacement sensors, tiltmeters and synthesize those signals. Furthermore, combined with the self-designed analogy low-pass filter and associated digital filter, the measuring system eliminates the effect of the train speed and hence the automatic measurement is realized. The feasibility of this device is demonstrated by the field testing.

Hou W.-X.,Transportation Bureau | Wang W.-D.,Infrastructure Inspection Center | Zeng Y.-Q.,China Academy of Railway Sciences
Tiedao Xuebao/Journal of the China Railway Society | Year: 2010

The instrumented wheelset under high-precision, high-speed and continuous measurement is the important technical means to conduct associated system tests, safety evaluation and simulation of rail-wheel relationship and system dynamics of high speed railways. In the recent years, lots of researches have been carried out into instrumented wheelsets in China and the core of the technical advancement has been achieved. In this paper, the basic principle, design methodology, manufacturing technology and static and dynamic calibration of the instrumented wheelset are expounded, and the actual application conditions of the instrumented wheelset installed on Number 0 high-speed comprehensive-inspection train are introduced, where high-precision continuous measurement of wheel-rail dynamic forces under high-speed rotation of wheelsets are made. The results show that the instrumented wheelset inspection can gain the complete set of wheel-rail interacting forces including the vertical, lateral, longitudinal and wheel-rail contact forces, thus creating conditions for further study and application of dynamic wheel-rail forces with high detecting precision, reliable data transmission and steady performance. How to use the instrumented wheelset to simulate wheel-rail dynamics of high-speed railways is also discussed.

Ren S.,Beijing Jiaotong University | Ren S.,Infrastructure Inspection Center | Gu S.,Infrastructure Inspection Center | Xu G.,Infrastructure Inspection Center | And 2 more authors.
Chinese Optics Letters | Year: 2011

We develop and build a new type of inspection car. A beam that is not rigidly connected to the train axle boxes and can absorb the vibration and impact caused by the high speed train is used, and a laser-camera measurement system based on the machine vision method is adopted. This method projects structural light onto the track and measures gauge and longitudinal irregularity. The measurement principle and model are discussed. Through numerous practical experiments, the rebuilt car is found to considerably eliminate the measurement errors caused by vibration and impact, thereby increasing measurement stability under high speeds. This new kind of inspection cars have been used in several Chinese administration bureaus. © 2011 Chinese Optics Letters.

Ren S.,Beijing Jiaotong University | Ren S.,Infrastructure Inspection Center | Gu S.,Infrastructure Inspection Center | Xu G.,Infrastructure Inspection Center | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Rail track geometric parameters, such as gage, level, twist, longitudinal irregularity, and alignment irregularity, etc., have much influence on the operation safety of train vehicles. GJ-4 track inspection car is a large scale dynamic measurement equipment for measuring track geometric parameters precisely and efficiently. It is useful to find track defects, guide track maintenance, and eliminate potential safety problems of track. However the device of measuring gage and alignment irregularity of this track inspection car is installed on a hanging beam, which is not suitable for rapid inspection and has higher failure rate. Hence this sub-system is replaced by the laser-camera method. The rebuild car is named GJ-4G. It greatly eliminates the measurement errors caused by the existing subsystem and increases the measuring stability. The feasibility of this track inspection car has been proven by the practical experiments carried out by Beijing Railway Administration. © 2010 SPIE.

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