Method for extracting natural frequency difference between blades by single blade tip timing sensor or uniformly distributed blade tip timing sensors

US11898453B1 · kind B1 · utility

Assignee

• XI'AN JIAOTONG UNIVERSITY · CN

Inventors

• Zhibo Yang · Hong Kong, CN
• Jiahui Cao · Tuji, CN
• Xuefeng Chen · 浮桥镇, CN
• Zengkun WANG · Tuji, CN
• Laihao Yang · Tuji, CN
• Shaohua TIAN · Tuji, CN
• Haoqi Li · Los Angeles, US
• Wenbo Li · Beijing, CN

Key dates

• Filing date: Oct 20, 2022
• Grant date: Feb 13, 2024
• Expiry date: Oct 20, 2042

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2270/821
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present disclosure discloses a method for extracting a natural frequency difference between blades by a single blade tip timing sensor or uniformly distributed blade tip timing sensors. The method includes the following steps: acquiring actual arrival time of a rotating blade by using a single blade tip timing sensor or uniformly distributed blade tip timing sensors, and converting a difference between theoretical arrival time and the actual arrival time into displacement data of a blade tip according to a rotational speed and a blade length of the rotating blade; selecting displacement data of blade tips of two rotating blades with the same blade length at the same rotational speed; intercepting the displacement data, performing discrete Fourier transform respectively, and making a sampling frequency approximate to an average rotational speed to obtain spectrum data.