Multilevel Evaluation Method of Acoustic Frequency Spectrum in Periodic Pipe Structure Based on Improved Radar Chart Method
1 State Key Laboratory of Oil and Gas Equipment, CNPC Tubular Goods Research Institute, Xi'an 710077, China
2 College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 266580, China
3 School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
4 CNPC Engineering Technology R&D Co., Beijing 102206, China
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