旋转叶片动应力非接触测量方法研究综述

doi:10.7527/S1000-6893.2023.28516

Abstract

Abstract:

Blade is an important energy conversion component of aero-engines and gas turbines. The fatigue fracture problem of blades seriously affects the operation safety of the unit， so it is particularly important to monitor its health status. Real-time dynamic stress monitoring and load spectrum construction for blades can help to predict the remaining life of blades， warn the initiation of blade cracks， and realize the health management for blades. Since the non-contact dynamic stress measurement method was proposed， it has shown great potential in improving the safe operation capability of aero-engines， gas turbines and other equipment. This paper reviews the basic principle of non-contact dynamic stress measurement and the main research achievements in recent years. Besides， it summarizes the key methods and technologies in dynamic stress inversion， including the accurate identification method of tip vibration displacement， the determination method of stress amplitude ratio， multi-mode dynamic stress calculation method， etc. Furthermore， it analyzes the error sources of dynamic stress inversion and two commonly used error calibration tools for non-contact measurement of dynamic stress， and presents an outlook on the key research directions.

Key words: dynamic stress inversion, blade tip timing, non-contact dynamic strain measurement, error analysis, digital twin

CLC Number:

V232.4

Weimin WANG, Dongfang HU. Review on non⁃contact dynamic stress measurement methods of rotating blades[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(22): 28516-028516.

Figures/Tables 7

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Review on non⁃contact dynamic stress measurement methods of rotating blades

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