Vibration test device for damped mistuned blade-disk with damping block structure

A technology of vibration testing and damping blocks, which is applied in the field of experimental devices, can solve the problems of insufficient research on mechanism and little understanding of performance, and achieve the effect of simple structure and convenient operation

Active Publication Date: 2018-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above reasons, the research on the relationship between damping mistuned blades and discs, especially the mechanism research, is still insufficient, and there is little understanding of the performance under actual operating conditions.

Method used

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  • Vibration test device for damped mistuned blade-disk with damping block structure
  • Vibration test device for damped mistuned blade-disk with damping block structure
  • Vibration test device for damped mistuned blade-disk with damping block structure

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] see figure 1 , the present invention has a damping detuned blade-disc vibration testing device with a damping block structure, including a base frame, a disc fixing device, a blade root fixing device, a centrifugal force loading device, an exciting vibration generating device and a measuring device.

[0032] see figure 2 , first introduce the turbine blades in the test. The turbine blade is composed of shroud 9 , damping block 10 , blade body 11 and blade root 12 . In the working state, due to the action of centrifugal force, on the one hand, the blade root 12 and the tooth surface of the wheel disc 13 are closely contacted and pressed together; Indirect contact and compression. Under the action of the airflow excitation force, relative slip occurs between the contact surfaces of adjacent blade shrouds 9, and the dry friction damping converts the vibration ...

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Abstract

The invention discloses a vibration testing device of a damping mistuning blade-turbine disk with a damping block structure. A turbine disk fixing device is fixed at the center of the bottom plate of a base frame; the pre-tightening force of a blade root fixing device can be increased by adjusting a nut, so that the blade root fixing device can be fixed between the edge of a turbine disk and the root of a blade; one end of a centrifugal force loading device is connected onto a damping block of a vane shroud ring, and the other end of the centrifugal force loading device winds around a slide rod and is vertically arranged; the centrifugal force loading device is used for controlling and making the centrifugal force of the blade damping block mistuned; an excitation generating device is fixed on an excitation plate of the base frame; and a measuring device is installed inside and outside the excitation plate and is fixed on the bottom plate of the base frame through bolts. The vibration testing device can be used for measuring the vibration feature of the damping mistuning blade-turbine disk system with the nonlinear dry friction damping block structure under an actual operating condition and can provide a reference basis for the design and failure analysis of the blade-turbine disks of high-performance engines, gas turbines and turbines.

Description

technical field [0001] The invention relates to the technical field of experimental devices, in particular to a vibration testing device for a damping detuned blade-disc with a damping block structure. Background technique [0002] As one of the most important components in turbomachinery, blades work in an extremely complex and harsh environment. High cycle fatigue caused by huge vibration stress is the main cause of blade damage. Due to manufacturing errors and wear in use, the actual blades have slight physical and geometric differences on the entire circle of blades, that is, detuned blades. The detuned blade-disk will produce vibration localization, which will greatly increase the vibration of the local blade compared with the harmonic adjustment, which may generally reach 2-4 times. The detuned phenomenon poses a great threat to the safety of blade vibration. [0003] Due to the loss of periodic symmetry due to detuning, the study of detuned blades must be based on fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02G01M13/00
CPCG01M7/02G01M13/00
Inventor 张荻赵伟刘天源谢永慧
Owner XI AN JIAOTONG UNIV
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