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Non-contact type displacement field measuring method and system for rotating blade

A non-contact technology of rotating blades, applied in measuring devices, vibration testing, testing of machine/structural components, etc., can solve problems such as limited displacement of blade ends, achieve high measurement accuracy, simple calculation process, and easy implementation

Active Publication Date: 2019-10-25
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention proposes a method and system for measuring the non-contact displacement field of the rotating blade, which solves the problem that the blade tip timing technology can only measure the limited displacement of the blade tip, and has the ability to simultaneously reconstruct the surface of the rotating blade Advantages with internal displacement of all nodes

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  • Non-contact type displacement field measuring method and system for rotating blade
  • Non-contact type displacement field measuring method and system for rotating blade
  • Non-contact type displacement field measuring method and system for rotating blade

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Embodiment Construction

[0041] The following will refer to the attached figure 1 to attach Figure 7 Specific examples of the present invention are described in more detail. 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 thr...

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Abstract

The invention discloses a non-contact type displacement field measuring method and system for a rotating blade. The method comprises the following steps of establishing a three-dimensional finite element model of a rotating blade to be measured, and extracting the modal parameters of the three-dimensional finite element model; determining the number of blade tip timing sensors and the axial mounting positions; constructing a conversion matrix of the limited measuring point displacement and an integral displacement field; and acquiring the limited position displacement of the blade tip of the rotating blade on the basis of the blade tip timing sensors, wherein the position displacement is subjected to the conversion matrix treatment to obtain the displacement field of any time, any positionand any direction of the rotating blade. According to the method provided by the invention, the displacement field of all nodes of the rotating blade is reconstructed by only utilizing the displacement of the finite measuring point at the blade tip in a reversion mode, the vibration measurement of the blade surface and the internal node 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 non-contact vibration testing of rotary blades, in particular to a non-contact displacement field measurement method and system for rotary blades. Background technique [0002] The integrity of the rotating blade directly affects the safe operation of the overall structure of the aeroengine. 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 and production of aero-e...

Claims

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Application Information

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IPC IPC(8): G01B21/02G01M7/02
CPCG01B21/02G01M7/025
Inventor 乔百杰陈雪峰何卫锋杨志勃刘金鑫
Owner XI AN JIAOTONG UNIV
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