Blade vibration event identification method based on time delay characteristics of blade tip timing data

• Main Authors: NIU GUANGYUE, LI FAFU, JIANG JIAJIA, QIN HAOWEI, DUAN FAJIE, GUO PEIXUAN, LIU HAO, FU XIAO
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The invention discloses a blade vibration event identification method based on a blade tip timing data time delay characteristic, which realizes accurate identification of a blade vibration event under the condition of a single sensor, and comprises the following steps: S1, installing a single blade tip timing sensor at the top of a certain blade on a certain rotating blade disc; s2, on the basis of the blade tip timing principle, the sampling time ti when each blade in each circle rotates to a blade tip timing sensor is measured, and when the blades are subjected to the action of external exciting force, displacement response of generated single-degree-of-freedom coupling-free vibration is obtained; s3, measuring the vibration displacement of each circle of each blade based on the step S2, and adding a rectangular window with the length of n to the vibration displacement; the vibration displacement, measured in the jth circle, of the ith blade is expressed as yij; s4, constructing a class reconstruction attr