Maximum localization vibration response method for mistuned bladed disc

Abstract

The invention provides a maximum localized vibration response method for a mistuned bladed disc, which is characterized by comprising the following specific steps: 1, establishing a total vibration differential equation of a mistuned bladed disc system; 2, calculating a differential equation of the whole system by using a direct integral method to obtain a vibration displacement response of each blade in the mistuned bladed disc system; 3, comparing the vibration displacement response of each blade to obtain the position of the blade where the maximum localized vibration response of the wholemistuned bladed disc system is located, and marking; and 4, according to the position of the blade where the maximum localized vibration response of the whole mistuned bladed disc system is located determined in the step 3, coupling rigidity is applied to the blade with the maximum localized vibration response and the adjacent blade, establishing an energy transmission channel, and reducing the maximum localized vibration response of the mistuned bladed disc system is reduced. According to the invention, the vibration localization vibration response of the mistuned bladed disc can be quickly and effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of impeller disks, and relates to a maximum localized vibration response method of a detuned blade disk. Background technique [0002] Cyclic symmetric structures are widely used in engineering, such as steam turbine blade discs, satellite antennas, etc. In an ideal cyclic symmetric structure, each substructure has the same physical characteristics. When the structure vibrates, the vibration will be transmitted evenly between the entire structure, and there will be no vibration localization phenomenon. However, due to various reasons, some asymmetrically distributed small quantities inevitably appear in the cyclic symmetric structure, and this phenomenon is called detuning in dynamics. When the cyclic symmetry structure is detuned, the structure will appear localized mode and vibration response, and then accompanied by the increase of dynamic stress, thus accelerating the high cycle fatigue of the structure...

AI Technical Summary

Problems solved by technology

At present, the existing literature mainly focuses on the main influencing factors affecting the localization degree of the vibration response of the detuned bladed disk system, which cannot be used to weaken the localization degree of the vibration response of the detuned bladed disk system.

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