Abstract:

At present, there are few studies on the straightness measurement of vacuum magnetic levitation pressure pipelines at home and abroad. Combining with the vacuum magnetic levitation high-speed train test device under construction of Southwest Jiaotong University, this paper puts forward a method for measuring the straightness of vacuum pipeline and introduces how to establish a high-precision three-dimensional control network in the pipeline, how to determine the coordinates of the center of each section of the pipe according to the three-dimensional control network and the method of circular curve fitting, and how to do the straight line fitting to analyze the straightness of the whole pipeline. Finally, according to the aboved method, a programis is compiled to process and analyze the measured data, which verifies the correctness and feasibility of the method, and provides reference for the construction of vacuum magnetic levitation pressure pipeline in the future.

Key words: vacuum pipe, straightness, three-dimensional control network, circular curve fitting, straight line fitting