Method for determining allowable amplitude of turbine engine blade

An engine blade and determination method technology, which is applied in the application of stable tension/pressure to test material strength, vibration test, machine/structural component test, etc. Different degrees of problems, to achieve the effect of helping understanding and engineering application

Active Publication Date: 2019-12-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for determining the allowable amplitude of turbine engine blades to solve the problems in the prior art that the determination methods for the allowable amplitude of turbine engine blades are complicated and the accuracy of the obtained results is not uniform

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  • Method for determining allowable amplitude of turbine engine blade
  • Method for determining allowable amplitude of turbine engine blade
  • Method for determining allowable amplitude of turbine engine blade

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Embodiment Construction

[0036] The present invention will be further explained below in conjunction with the accompanying drawings.

[0037] A method for determining the allowable vibration amplitude of a turbine engine blade of the present invention comprises: normal temperature quasi-static tensile test of a standard smooth test piece of material for the blade, high-temperature quasi-static tensile test of a standard smooth test piece of material for the blade, standard smoothness of the material for the blade Normal temperature high cycle fatigue test of the test piece, high temperature high cycle fatigue test of the blade material standard smooth test piece, high cycle fatigue test of the actual blade, and determination of the allowable amplitude of the actual blade. The test equipment used includes electro-hydraulic servo fatigue testing machine, electro-hydraulic servo tension-torsion fatigue testing machine with high temperature furnace, and electromagnetic exciter. The normal temperature desc...

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Abstract

The invention discloses a method for determining allowable amplitude of a turbine engine blade. The method comprises the following steps: correspondingly carrying out a normal-temperature quasi-statictensile test on a standard smooth test piece of the material for the blade and a high-temperature quasi-static tensile test on the standard smooth test piece of the material for the blade so as to obtain the attribute of the basic material of the material for the blade of the turbine engine; correspondingly carrying out a normal-temperature high-cycle fatigue test on a standard smooth test pieceof the material for the blade and a normal-temperature high-cycle fatigue test on the standard smooth test piece of the material for the blade to obtain an equal life curve of the material for the blade; carrying out an actual blade high cycle fatigue device to determine the blade fatigue limit at normal temperature; and introducing a relation between the fatigue life reserve coefficient and the amplitude of the monitoring point, and determining the allowable amplitude of the actual blade. The method is simple in design experiment and low in cost; the determined allowable amplitude result is more accurate, and the accuracy of the result is improved.

Description

technical field [0001] The invention belongs to the technical field of turbomachinery, in particular to a method for determining the allowable vibration amplitude of a turbine engine blade. Background technique [0002] In the actual service state, the blades of the steam turbine are subjected to large centrifugal loads due to high speed. At this time, if the blades resonate due to factors such as uneven flow field and wake excitation of the stator guide blades, the blades will be under centrifugal load. Asymmetric cyclic fatigue failure occurs under the joint action of static stress and alternating stress caused by blade vibration. Therefore, it is necessary to study the fatigue failure of steam turbine blades due to vibration during actual service, and then determine the allowable vibration amplitude of turbine engine blades. . However, the existing methods for determining the allowable vibration amplitude of turbine engine blades are complicated, and the accuracy of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01N3/10G01N3/18G01N3/38
CPCG01M7/00G01N3/10G01N3/18G01N3/38G01N2203/0003G01N2203/0005G01N2203/0017G01N2203/0048G01N2203/005G01N2203/0073G01N2203/0075G01N2203/0226
Inventor 牛序铭宋迎东赵旭孙志刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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