CN-122016207-A - Damping measurement optimization method for adjustable stator blade

Abstract

The invention provides an adjustable stator blade damping measurement optimization method which comprises the following steps of S01, preparing a test fixture and stator blades, S02, starting a vibrating table system, determining damping parameters of the stator blades, obtaining damping curves of the stator blades under gaps, S03, repeating the step S01 and the step S02, obtaining damping curves of the stator blades under different gaps, S04, determining vibration magnitude ranges, calculating the area of each damping curve in the vibration magnitude ranges, and S05, selecting a gap corresponding to the largest area in the S04 as the installation gap of the stator blades. The invention realizes the accurate measurement and optimization of the damping parameters of the adjustable stator blade, solves the problems of inaccurate traditional direct measurement results and difficult quantification of the comprehensive damping effect, provides reliable method support for the damping optimization of similar components in the development process of the engine, and has remarkable engineering application value.

Inventors

• FU SHUNGUO
• HE YUN
• LUO XIANQIANG
• DAI JIANGBO
• WANG QI
• LIU MEIRU
• SHI TINGTING

Assignees

• 中国航发四川燃气涡轮研究院

Dates

Publication Date

20260512

Application Date

20260109

Claims (6)

1. 1. The method for measuring and optimizing the damping of the adjustable stator blade is characterized by comprising the following steps of: step S01, preparing a test fixture and a stator blade; s02, starting a vibrating table system, determining damping parameters of the stator blades, and obtaining damping curves of the stator blades under the gap; step S03, repeating the step S01 and the step S02, and obtaining damping curves of stator blades under different gaps; step S04, determining a vibration magnitude range, and calculating the area of each damping curve in the vibration magnitude range; And S05, selecting a gap corresponding to the maximum area value in the step S04 as an installation gap of the stator blade.
2. 2. The method for optimizing damping measurement of an adjustable stator vane according to claim 1, wherein step S01 specifically comprises: Fixing and restraining the test fixture and one end of the stator blade, wherein an adjustable gap is arranged at the other end of the test fixture; the test fixture is arranged on the vibrating table sliding table, and strain gauges are arranged at the wiring positions of the stator blades and connected with the test systems.
3. 3. The method for optimizing damping measurement of an adjustable stator vane according to claim 2, wherein step S02 specifically comprises: starting a vibrating table system, and acquiring the natural frequency of a stator blade through frequency sweep; performing excitation operation under natural frequency to obtain a frequency response curve under the conditions of setting a gap and setting excitation force; determining damping parameters by a half-power bandwidth method; changing exciting force, obtaining damping parameters under different exciting forces and drawing a damping curve of the stator blade under the gap.
4. 4. The method for optimizing damping measurement of an adjustable stator vane according to claim 3, wherein the half power bandwidth method is , wherein, For the corresponding damping parameter(s), For the first frequency to be the first frequency, As a function of the fundamental frequency, Is the second frequency.
5. 5. The method for optimizing damping measurement of an adjustable stator vane according to claim 4, wherein said step S04 is specifically performed by the formula And calculating the area of each damping curve in the vibration magnitude range, wherein A 1 and A 2 are end points of the vibration magnitude range.
6. 6. The method for optimizing damping measurement of an adjustable stator blade according to claim 3, wherein the step S02 of obtaining damping parameters under different exciting forces is specifically to obtain damping parameters under at least 20 different exciting forces.

Description

Damping measurement optimization method for adjustable stator blade Technical Field The invention relates to the technical field of engine tests, in particular to an adjustable stator blade damping measurement optimization method. Background With the rapid development of power equipment, the damage of vibration of each component in the test is also serious, and the components are extremely easy to fatigue and crack or break in long-time work. Damping technology is one of the very effective means for reducing the damage caused by vibration. Damping generally refers to the ability of the interior of a material to dissipate mechanical vibrational energy into thermal energy during vibration deformation, i.e., the ratio of the energy lost by the system to the energy input. The damping is applied properly, so that the engineering vibration resistance can be greatly improved, and a powerful guarantee is provided for troubleshooting and dynamic design. Meanwhile, the damping design is one of the design works with great difficulty in engineering, and how to better play the forward function of damping is also a difficult problem to overcome in the current power development. Stator vanes are important components in the engine development process and play an important role in the test. In the test process, the stator blade vibrates under the excitation of factors such as air flow, and the stator blade is easy to generate vibration fatigue to generate cracks or breaks to generate faults after long-time test. Disclosure of Invention In view of the above, the present invention provides an adjustable stator blade damping measurement optimization method to achieve the purpose of damping measurement optimization. The invention provides the following technical scheme that the method for measuring and optimizing damping of the adjustable stator blade comprises the following steps of S01, preparing a test fixture and the stator blade, S02, starting a vibrating table system, determining damping parameters of the stator blade, obtaining damping curves of the stator blade under the gap, S03, repeating the S01 and the S02, obtaining damping curves of the stator blade under different gaps, S04, determining vibration magnitude ranges, calculating the area of each damping curve in the vibration magnitude ranges, and S05, selecting a gap corresponding to the largest area in the S04 as the mounting gap of the stator blade. Compared with the prior art, the method has the advantages that at least one technical scheme adopted by the method at least comprises the steps of realizing accurate measurement and optimization of damping parameters of the adjustable stator blade, overcoming the problems that the traditional direct measurement result is inaccurate and the comprehensive damping effect is difficult to quantify, providing reliable method support for damping optimization of similar components in the engine development process, and having remarkable engineering application value. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic flow chart of an embodiment of the present invention; FIG. 2 is a schematic diagram of a damping parameter measurement curve; fig. 3 is a schematic diagram of a damping measurement screening curve. Detailed Description Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments. As shown in FIG. 1, the adjustable stator blade damping measurement optimization method aims at realizing optimization of the damping effect of the stator blade by precisely controlling test conditions, scientifically measuring damping parameters and screening optimal gaps through a system, providing reliable data support for structural design optimization and fault diagnosis of the stator blade of the engine, effectively improving the vibration resistance of the stator blade and reducing the crack or fracture risk caused by vibration fatigue. And step S01, preparing a test fixture and a stator blade. The core of the step is to build a test platform meeting the test requirements, ensure that the test conditions are consistent with the actual working state of the stator blade on the engine, and lay a foundation for the accuracy of the subsequent damping parameter measurement. The specific implementation process is as follows: and sel