Vibration testing device of damping mistuning blade-turbine disk with damping block structure

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-wheel disc with a damping block structure. Background technique [0002] As one of the most important parts of turbomachinery, the blade has a very complicated and harsh working environment. High cycle fatigue caused by huge vibration stress is the main reason for blade damage. In actual blades, due to manufacturing errors and wear during use, there are slight physical and geometric differences in the entire circle of blades, which are detuning blades. Detuning blade-wheel disc will produce vibration localization phenomenon, which makes the local blade vibration greatly increase compared with the time of resonance, and generally may reach 2-4 times. The detuning phenomenon poses a great threat to the blade vibration safety. [0003] Due to the loss of periodic symmetry due to detuning, the study of detuning blades must...

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.

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