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Non-contact dynamic strain field measurement method for rotary vane, and system thereof

A rotating blade, non-contact technology, applied in the direction of measuring devices, vibration testing, jet engine testing, etc., can solve the problems of low reliability, continuous working time, low survival rate, etc., and achieve easy on-line measurement, high measurement accuracy, easy-to-achieve effects

Active Publication Date: 2019-06-11
XI AN JIAOTONG UNIV
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Problems solved by technology

For a long time, aeroengine blades have achieved dynamic strain measurement by pasting strain gauges on the surface of the rotating blade, which can only measure the dynamic strain at a limited position of the blade, and its reliability and continuous working time are low, especially in high temperature environments. A large number of strain gauges are arranged on the blade, often only a few strain gauges can obtain effective information, and the survival rate is extremely low

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  • Non-contact dynamic strain field measurement method for rotary vane, and system thereof
  • Non-contact dynamic strain field measurement method for rotary vane, and system thereof
  • Non-contact dynamic strain field measurement method for rotary vane, and system thereof

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Embodiment Construction

[0040] The following will refer to the attached figure 1 A specific embodiment of the present invention is described in more detail to FIG. 7( b ). 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.

[0041] 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 throug...

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Abstract

The invention discloses a non-contact dynamic strain field measurement method for a rotary vane, and a system thereof. The method comprises the following steps that: establishing the three-dimensionalfinite element model of a rotary vane to be measured, and extracting the modal parameter of the three-dimensional finite element model; determining the number and the axial installation positions oftip-timing sensors; constructing a transfer matrix of finite measurement point displacement and an integral strain field; and on the basis of the tip-timing sensors, obtaining the finite position displacement of a rotary vane tip, wherein the dynamic strain obtains the dynamic strain of the rotary vane at any moment, any position and any direction on the basis of transfer matrix modal processing.By use of the method, tip finite measurement point displacement is used for realizing the reconstruction of the integral strain field of the rotary vane, the measurement of the dynamic strain of the vane surface can be realized, and the measurement of the positive strain and the shearing strain of the internal node of the vane can be realized. The method has the advantages of simple calculation process, high measurement accuracy and easiness in online measurement.

Description

technical field [0001] The invention belongs to the technical field of non-contact vibration testing of rotating machine blades, in particular to a method and system for measuring non-contact dynamic strain field of rotating blades. 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 developme...

Claims

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Application Information

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IPC IPC(8): G01B21/32G01M7/02
CPCG01B21/32G01M7/045G01M5/0016G01M7/02G06F30/23G01M15/14
Inventor 乔百杰敖春燕陈雪峰曹宏瑞孙瑜
Owner XI AN JIAOTONG UNIV
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