A rotating high-frequency alternating airflow excitation test device

Abstract

The invention provides a rotary high-frequency alternating air flow excitation test device. The rotary high-frequency alternating air flow excitation test device comprises a driving system, a rotary alternating air flow generation device and a gas source system. Compressed gas is stored through a front gas storage tank, the air inflow is increased, and the defects of insufficient air inflow is avoided; by adopting a rotary disc circumferential surface arrangement mode and by combining labyrinth seal, gas leakage is avoided, and the using efficiency of the compressed gas is improved; structuralforms such as a spindle, a tank main gas inlet hole, a tank auxiliary gas inlet hole, a spindle elliptical kidney-shaped hole and a tank conical hole are adopted, gas flowing is smooth, and it is ensured that the gas has the sufficient energy; and high-efficiency and high-intensity analog gas flow high-frequency alternating excitation is achieved; and a spraying nozzle is coincident with a rotarycenter in position, arrangement of a test piece is facilitated, and the structure is more compact.

Description

technical field [0001] The invention relates to the field of mechanical vibration test equipment. Background technique [0002] Gas turbine engine inner blades and other components need to be subjected to vibration tests during the design process and before application, in order to ascertain the inherent characteristics and vibration response characteristics of the part structure. At present, the fatigue test of the blade is usually carried out on the electrodynamic vibration table. However, parts such as blades are actually in an alternating gas excitation environment, and there is a complex coupling relationship between the gas and the blades, such as the influence of gas viscosity on the vibration of the blades. It is often difficult to simulate the actual working environment of the blades with gas excitation by using an electric vibration table. Some special vibration properties due to coupling effects cannot be excited, resulting in a large error between the vibration ...

AI Technical Summary

Problems solved by technology

However, on the one hand, this kind of test equipment does not have an airflow storage device at the front end of the compressed airflow supply, resulting in insufficient airflow through the air pipe; , which leads to the loss of most of the airflow, the airflow through the round hole of the turntable is less, the excitation force is insufficient, and the efficiency is low. Moreover, the position of the nozzle of the device used deviates from the rotation center by a certain distance, resulting in a compact structure.

On the basis of the above-mentioned patents, Northeastern University proposed a high-frequency air-induced test device for fiber-reinforced composite thin-walled components (Patent No. ZL201610091215.8). There is an airflow reverser, and the airflow reverser is set on the movable frame, and the test bench is set on the base below the airflow reverser, to simulate the compound excitation of fiber reinforced composite thin-walled components, but a patented airflow excitation is still used. Due to the structural form of the vibration test equipment (Patent No. ZL201320754575.3), there are still some inherent problems such as insufficient excitation force and low efficiency.

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