The high-speed railway track regularity directly impacts the safety and comfort of train operations.The chord measurement method serves as a direct means to guide the maintenance and repair of track profile and alignment irregularities,with its results providing direct guidance for precise track adjustment.A dynamic chord measurement method based on inertial is proposed to address the issues of low efficiency and heavy workload using static chord measurement method,as well as difficulty in visually identifying measurement benchmarks on-site using dynamic inertial reference methods.Firstly,a dynamic short chord measurement value is established based on the inertia measurement approach.The dynamic long chord measurement value is derived through matrix deduction.This dynamic chord measurement method has been applied on the domestically preeminent GJ-6 track inspection system.Secondly,the sources of errors in the dynamic chord measurement method is analyzed and a formula for calculating the standard deviation of errors is proposed;the results indicate that the standard deviation of errors in the dynamic chord measurement method increases to the power of 1.5 with the increase of the basic chord length multiple.Finally,the stability of 10 m and 20 m dynamic chord measurement values is verified through a comprehensive track inspection test calibration platform simulating track irregularity excitations.The results show that the average multiple ratio of 10 m and 20 m chord measurement values to the spatial curve amplitude of equal wavelengths are 2.007 and 2.045,respectively.The result is consistent with the characteristics of midpoint chord measurement principle.This provides a theoretical and experimental basis for the correlation analysis of dynamic and static track inspection.
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