Research On The Application Of Measurement Technology Of Front End Deviation Of DWL-48 Tamping Car

With the application and development of inertial navigation measurement technology in the field of railway precision measurement,the operation mode of precise tamping of inertial navigation measurement car and DWL-48 tamping car is becoming more and more mature.However,the existing inertial navigation measurement vehicle requires the cooperation of the whole station for measurement,which takes a long time and has low measurement efficiency.Moreover,the detection skylight must be applied for separately in advance,which leads to deficiencies such as not providing timely data and occupying too many skylights.In addition,the accurate tamping of the existing tamping car is generated by the measuring car.The front-end deviation provided by.Ver format data does not take into account the influence factors such as the track lifting capacity of the tamper,bridge and culvert characteristics,rail rebound,etc.,so the operation quality cannot achieve the expected effect.In order to further improve the working quality and efficiency of DWL-48 tamper,make full use of public works maintenance skylight,reduce the frequency of public works personnel on the road,and ensure the safety of railway transportation,a front-end deviation measurement technology based on the integrated navigation system of inertial navigation system(INS)and global navigation satellite system(GNSS)was proposed.It is used in line tamping operation of DWL-48 tamper.The measurement system of DWL-48 tamper was studied,and it was found that the sensor could not correct the long wave irregularity of the track line,and the laser collimation system could not work on the curve.The existing construction process of DL-48 tamper involved in line tamping operation is studied,and the existing construction organization needs to be improved.The calculation principle of key measurement technology of GNSS/INS combined system is analyzed to provide theoretical support for the front end deviation measurement car.On this basis,the structure composition and installation scheme of the front-end deviation measuring car are put forward.According to its design characteristics,the working flow of line tamping operation with DWL-48 tamping car is determined: The front-end deviation measuring car measures at a certain distance in front of the tamping car.The optimized measurement data will guide the tamping operation of the next skylight point.After the measurement is completed,it will return to the tamping operation section on the same day to carry out the job quality check,obtain the railway TQI value,and evaluate the job quality.By comparing with the existing construction process,it is found that using the skylight with the front-end deviation measuring trolley and the tamping operation can indeed optimize the operation process to improve the utilization rate of the skylight.In order to verify that the measurement data of the front-end deviation measuring car can guide the operation of the DWL-48 tamping car,a test scheme was designed.After many field measurement tests,it was found that the obtained data were better than that of a domestic inertial navigation car brand and could be controlled within the allowable error.The line deviation data guided the railway TQI drop after tamping operation to exceed the expectation,so as to draw the conclusion that the front-end deviation measuring car meets the application requirements of the DWL-48 tamping car.