Study On The OCS Geometric Parameters' Inspection System Based On Non-Contact Mesurement

With the rapid development of our country's railway undertakings, the requirements of OCS(overhead contact system)'s dynamic characteristics for urban rail transit and national railway have been greatly increased. Since there is obvious distinction between the parameters detected at high speed and at low or medium speed, considering that the former is more truthfulness to reflect the actual condition and deserves more reference, it gets more and more attention to adopt more advanced high-speed dynamic OCS detection technology used for researching and evaluating the running quality of railway consequently.In view of the defect and deficiency of current OCS geometric parameters' inspection methods, this dissertation presents a non-contact detection scheme to gain the parameters by object-identification and motion-track according to the contour curve obtained from the 2-dimentional laser radar when the OCS is within its range on the basis of studying various OCS inspection approaches domestic and overseas. Thus, for the non-contact testability of the measure, the inspection system is able to work in 2 modes: one is dynamic parameters detection mode, namely gaining parameters when simulation pantograph rises, which is close to the train's actual working condition because the pantograph can hold good following characteristic owing to the installation of laser radar on the top of locomotive induducing no extra mass; the other is static parameters detection mode, namely obtaining parameters without pantogragh-catenary contact, which is close to the parameter's static value by and large for the OCS is nearly on natural ground and introduced no extra lift and vibration by the contact force of pantograph. Besides the independent use of the two modes above in dynamic quality research and ordinary maitenance, we can combine with them so as to provide more intuitionistic and reliable analytical basis for the further research of dynamic quality.In this paper, laser radar based on distance-measurement theory of light flying time is used as data acquisition unit, embedded computer with prolific interfaces and strong data-processing capacity is used as front-end processor, and IPC with stable and reliable performance is used as graphic user interface, data processing module and output terminal; Afterwards, several connection modes are designed on account of real-timing and flexible porting requirements; Then, detection principle, error influence factors, data effectiveness control strategy, and pro and cons of the different laser radar's installation ways on the detection results, are discussed respectively in detail; Subsequently, some kinds of familiar digital filters are adopted comparatively for the parameters; Besides, the course of analysis, design and realization of the system's application software is also set forth under the ideological guidance and with the technological support of software engineering. Moreover, the feasibility and rationality of the scheme are verified by practical use and comparative analysis with the contact detection mode.