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Blade dynamic strain field and displacement field reconstruction method and system based on modal decoupling

A dynamic strain and displacement field technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficult to decouple strain gauges

Active Publication Date: 2019-07-19
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention proposes a strain field and displacement field reconstruction method and system based on multi-mode decoupling of rotor blade dynamic strain, which solves the problem of dynamic strain under multi-mode vibration with few measuring points. Decoupling and strain gauges can only measure the dynamic strain problem at a limited position of the blade, and have the advantage of reconstructing the surface and internal displacement fields of the blade

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  • Blade dynamic strain field and displacement field reconstruction method and system based on modal decoupling
  • Blade dynamic strain field and displacement field reconstruction method and system based on modal decoupling
  • Blade dynamic strain field and displacement field reconstruction method and system based on modal decoupling

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[0058] 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.

[0059] 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 strain field and displacement field reconstruction method and system based on rotor blade dynamic strain multi-modal decoupling, and the method comprises the steps of building a three-dimensional finite element model of a to-be-measured rotor blade, and extracting the modal parameters of the three-dimensional finite element model; arranging a strain gauge on the rotor blade, and measuring the multi-modal vibration of the rotor blade through the dynamic strain of a measuring point where the strain gauge is located; decoupling the multi-modal vibration of the rotor blade; and establishing a mapping relation between the measuring point strain and the full-field strain and displacement, wherein the dynamic strain is reconstructed based on the mapping relation to obtain the dynamic strain and displacement of the rotor blade at any time, at any position and in any direction. According to the method, the rotor blade dynamic strain decoupling under multi-mode vibration can be achieved, the reconstruction of an overall strain field and a displacement field can be achieved only through single measuring point strain information, not only the blade surface vibrationmeasurement can be achieved, but also the internal node vibration measurement can also be achieved, the calculation process is simple, and the measurement precision is high.

Description

technical field [0001] The invention belongs to the technical field of vibration testing of aeroengines and gas turbine blades, in particular to a strain field and displacement field reconstruction method and system based on multi-mode decoupling of dynamic strain of rotor blades. Background technique [0002] The integrity of the 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. Blade vibration 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-engines, in order to grasp the vibration character...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 乔百杰翟智陈雪峰田绍华吴淑明
Owner XI AN JIAOTONG UNIV
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