Research On Data Processing Method Of Dynamic Bridge Alignment Detection

In recent years,the rapid development of China's transportation industry,highway,railway and bridge maintenance and repair work is particularly important and urgent.The alignment of the bridge detection is the traditional given high precision elevation data section discrete observation points in the closed test environment under the linear structure of bridge linear fitting,detection method of such high and low efficiency of the test environment.In order to obtain the observation data efficiently,the mobile measurement system is applied to the bridge detection field.The mobile measurement is carried out in an open environment,and the three-dimensional coordinates of the continuous travel path in the geodetic coordinate system are obtained directly.However,in the open measurement environment,the dynamic continuous elevation data of MMS can not be directly used as the structural alignment of the bridge.The measurement error introduced by mobile carrier path shift measurement vector and bridge coupling vibration and geodetic coordinates to bridge axis coordinate conversion factor is far greater than the allowable precision alignment of bridge detection.The fine processing of basic data based on MMS is the precondition of the alignment accuracy of the bridge structure.In this paper,the problems existing in the application of mobile measurement in bridge structural alignment detection are studied.These include:1.Path offset error compensation method.This method takes into account the structure of linear curve path measuring carrier deviation measure bridge environment open problems in the analysis of attitude change vector and calculate the path offset error compensation on elevation data detection.2.Multi vehicle bridge coupling vibration error processing method.This method fully considers the interaction between bridge surface roughness and vehicle to vehicle bridge coupling vibration,through the establishment of multi vehicle bridge coupling vibration model,the vibration spectrum of coupled vibration spectrum can be obtained as a conclusion the average error spectrum,thus the effect of spectral subtraction reduces vehicle bridge coupling vibration of foundation data.3.High-precision coordinate conversion parameters.Common point transformation considering the geodetic coordinates to bridge axis coordinate system in precision and number on the impact of conversion accuracy,established the coordinate transformation adjustment mathematical model,algorithm of coordinate transformation design,and puts forward the accuracy evaluation of coordinate conversion parameters standard.The genetic algorithm is designed to realize the automatic selection of the common points of coordinate transformation.It provides a theoretical basis and a high precision guarantee for the conversion of the bridge structure from MMS to the bridge axis coordinate system.In order to verify the correctness and feasibility of the fine processing method for the basic data of dynamic bridge structure linear detection,the bridge structure alignment using mobile measurement vector of different vehicle speed and different routes to Wuhan Qingchuan Bridge detection.The method of processing fine detection of basic data,are compared with the traditional measurement method of high precision line of the bridge structure,the detection error under different speeds is 0.3mm,achieve the linear measurement requirements of bridge structure.The error theory and the processing method under different measuring conditions corresponding to the value and the actual value of processing shape of correlation analysis,it proves that the proposed the fine processing method is correct and feasible,which provides a method for realizing high precision linear detection of bridge structure.