A rotating blade displacement field inversion reconstruction method and system

A technology of rotating blades and displacement fields, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low measurement accuracy and complex data processing process, achieve high measurement accuracy, simple calculation process, and save strain film effect

Active Publication Date: 2019-06-14
XI AN JIAOTONG UNIV
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Problems solved by technology

The blade tip timing uses the sensor installed close to the inner side of the casing to sense the vibration information of the blade tip, but it can only measure the vibration at a limited position of the blade tip, and the data processing process is relatively complicated, and the measurement accuracy is generally lower than that of the strain gauge results

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  • A rotating blade displacement field inversion reconstruction method and system
  • A rotating blade displacement field inversion reconstruction method and system
  • A rotating blade displacement field inversion reconstruction method and system

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Embodiment Construction

[0041] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the spe...

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Abstract

The invention discloses a rotary blade displacement field inversion reconstruction method and system, and the method comprises the following steps: building a three-dimensional finite element model ofa to-be-measured rotary blade, extracting modal parameters of the three-dimensional finite element model; arranging a plurality of strain gages on the rotating blade, determining the number, positions and directions of measuring points of the strain gages; constructing a conversion coefficient matrix of the strain gauge measuring point dynamic strain and the full-field displacement; and measuringthe dynamic strain of the corresponding position of the rotating blade based on the strain gauge, wherein the dynamic strain is reconstructed based on the conversion coefficient matrix to obtain thedisplacement of the rotating blade at any time, at any position and in any direction. According to the method provided by the invention, the reconstruction of the overall displacement field of the rotating blade is realized only by using extremely few measuring point strains, the measurement of blade surface vibration can be realized, the measurement of blade internal node vibration can be realized, the calculation process is simple, the measurement precision is high, and the online measurement is easy.

Description

technical field [0001] The invention belongs to the technical field of vibration testing of rotary blades, in particular to a method for inversion and reconstruction of a displacement field of a rotary blade and a system thereof. Background technique [0002] The integrity of the high-speed rotating blade directly affects the safe operation of the overall structure of the aero-engine. Affected by factors such as harsh working environment and strong alternating loads, it is very easy to generate vibration fatigue cracks during service and cause serious accidents. High cycle fatigue caused by excessive blade vibration is the main failure mode of aeroengine blades. Blade high cycle fatigue is mainly caused by dynamic stress caused by various aerodynamic loads and mechanical loads, and a large number of cycles can accumulate fatigue cracks in a short period of time, especially when the blade resonates, dynamic stress can easily lead to blade fatigue failure. In the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 乔百杰杨志勃陈雪峰田绍华杨来浩
Owner XI AN JIAOTONG UNIV
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