公开(公告)号：US20240133845A1

公开(公告)日：2024-04-25

申请号：US17971429

申请日：2022-10-20

Applicant: XI'AN JIAOTONG UNIVERSITY

Inventor： Zhibo YANG ,  Jiahui CAO ,  Haoqi LI ,  Shaohua TIAN ,  Laihao YANG ,  Zengkun WANG ,  Xuefeng CHEN ,  Shuming WU

IPC: G01N29/12 ,  G06F17/14 ,  G06F17/16

CPC classification number: G01N29/12 ,  G06F17/14 ,  G06F17/16

Abstract: The present disclosure discloses a method for detecting a natural frequency of a blade by a single blade tip timing sensor. In the method, two segments of displacement data vectors are subjected to dot product to obtain a product data vector after multiplication of corresponding serial numbers, the product data vector is subjected to low-frequency filtering, the filtered product vector is subjected to Hilbert transform to obtain an instantaneous phase, the instantaneous phase is subjected to discrete Fourier transform, an absolute value of a natural frequency difference between blades is extracted from amplitude frequency data, blades on a bladed disk are subjected to permutation and combination to obtain absolute values of the natural frequency differences between all the blades, a sum of the absolute values of the natural frequency differences between each blade and other blades is calculated.

公开(公告)号：US20240230597A9

公开(公告)日：2024-07-11

申请号：US17971429

申请日：2022-10-21

Applicant: XI'AN JIAOTONG UNIVERSITY

Inventor： Zhibo YANG ,  Jiahui CAO ,  Haoqi LI ,  Shaohua TIAN ,  Laihao YANG ,  Zengkun WANG ,  Xuefeng CHEN ,  Shuming WU

IPC: G01N29/12 ,  G06F17/14 ,  G06F17/16

CPC classification number: G01N29/12 ,  G06F17/14 ,  G06F17/16

Abstract: The present disclosure discloses a method for detecting a natural frequency of a blade by a single blade tip timing sensor. In the method, two segments of displacement data vectors are subjected to dot product to obtain a product data vector after multiplication of corresponding serial numbers, the product data vector is subjected to low-frequency filtering, the filtered product vector is subjected to Hilbert transform to obtain an instantaneous phase, the instantaneous phase is subjected to discrete Fourier transform, an absolute value of a natural frequency difference between blades is extracted from amplitude frequency data, blades on a bladed disk are subjected to permutation and combination to obtain absolute values of the natural frequency differences between all the blades, a sum of the absolute values of the natural frequency differences between each blade and other blades is calculated.