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Test method for natural frequency of blade of integral blade disc

A technology of integral blisk and natural frequency, applied to vibration measurement in solids, measurement of resonance frequency, measurement of vibration and other directions

Inactive Publication Date: 2012-07-11
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a test method for the natural frequency of the blisk blade, so as to solve the problems of low experimental precision and narrow frequency range in the previous test methods , unable to eliminate the problem of disc coupling vibration

Method used

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  • Test method for natural frequency of blade of integral blade disc
  • Test method for natural frequency of blade of integral blade disc
  • Test method for natural frequency of blade of integral blade disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Three kinds of free damping materials: rubber tube, foam block, and rubber foam are tested for damping characteristics, and the transfer function analysis of the damped blade is carried out, see Figure 1~Figure 3 , From the above three figures, it can be seen that the transmission curve of the blade constrained by rubber foam is flatter below 4KHz, which means that the resonance peak of the blade using rubber foam is more effectively suppressed.

Embodiment 2

[0034] In order to study the dynamic characteristics of a single blade on the blisk in depth, the method of applying engineering damping (rubber foam) to all non-tested blades on the blisk, such as Figure 4 shown, while Figure 5 with Image 6 It is the time-domain diagram of the free damping vibration after being stimulated by the propelling excitation under the two conditions before and after the blade is constrained. It can be seen from the figure that this damping method effectively solves the coupling vibration between the blades, thereby improving the blade mode. The accuracy of the state test.

[0035] Example 2

[0036] To detect the natural frequency of a blisk blade, first, use a clamp to fix the blisk on the vibration table; then, use rubber foam to damp the non-tested blades in the blisk blade (see Figure 4 ), and then divide the measured leaf into 7 parts on average to get 14 nodes (see Figure 7 ); each node is knocked with an aluminum hammer, and the vibra...

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Abstract

The invention provides a test method for natural frequency of a blade of an integral blade disc, which combines a damping vibration attenuation technology and a modality identification technology, expands application range, and specifically comprises the steps of a fixed stage, a damping stage, joint point division, vibration test and data verification. The test method for the natural frequency of the blade of the integral blade disc has the advantages of being high in test precision, wide in frequency range and capable of removing coupling vibration of the blade of the blade disc.

Description

technical field [0001] The invention relates to the field of frequency testing of parts, and in particular provides a method for testing the natural frequency of integral blisk blades. Background technique [0002] At present, the domestic testing methods for the natural frequency of components are basically divided into two categories, the "percussion method" test and the "resonance method" test. [0003] The "percussion method" test is used for ordinary single component testing. The natural frequency of the test piece is obtained through the transfer analysis of the excitation received by the test piece and the vibration signal picked up. The test accuracy of this method is poor, and the vibration form corresponding to each order frequency of the specimen cannot be identified. [0004] The "resonance method" test uses an electromagnetic vibrating table to excite the specimen, and when the specimen resonates, the "sand throwing method" is used to determine the mode shape o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/00G01H13/00
Inventor 王国鹏万利范秀杰王闯刘伟
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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