High frequency gas excitation tester

Abstract

The invention discloses a high frequency gas excitation tester, which belongs to the technical field of engine blade experiment. In the present invention, the first motor drives the first double fulcrum driving shaft through the first speed increaser to drive a to-be-tested overall blade plate. The second motor drives the second double fulcrum driving shaft through the second speed increaser; the second double fulcrum driving shaft, through soft connection, is connected to an air guiding shaft positioned by the double positioning fulcrum; the air guiding shaft seals the gas collection ring through a well-sealing flange; the gas collection ring is provided with an excitation spray nozzle at the position corresponding to the blade of the blade plate. The air guiding ring fixedly arranged on the double positioning fulcrum guides air in through the air inlet nozzle. Between the air guiding ring and the air guiding shaft, a well-sealing tooth is provided to have the two sealed. The air guiding shaft is provided with an air guiding hole. The air enters the air guiding shaft from the air guiding ring through the air guiding hole, and arrives at the excitation nozzle through the air collection ring before finally being exerted on the blade of the blade plate to perform real time testing on vibration response of the to-be-tested blade through electric guiding device. The excitation frequency range of the invention is wide; the excitation energy can be adjusted; and the whole-stage blade can be tested synchronously.

Description

technical field [0001] The invention belongs to the technical field of engine blade experiments, and in particular relates to a high-frequency gas excitation tester. Background technique [0002] The vibration characteristics test of aeroengine blades is usually excited by an electromagnetic vibration table, and the frequency is not higher than 5000 Hz. It is powerless for the test of the integration of the integral blisk or the integral blade ring of a certain model. An electromagnetic vibration table is required for the excitation frequency exceeding 5000 Hz. It is very difficult to achieve, even if the excitation exceeding 5000Hz can be realized, the excitation energy is usually very small, and there is no technical solution to realize the excitation of the entire blade. [0003] For the integral blisk and leaf ring technology widely used in a certain model, foreign countries have begun to study the whole-stage blade excitation method based on the rotor tester. Usually, a...

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Problems solved by technology

[0002] The vibration characteristics test of aeroengine blades is usually excited by an electromagnetic vibration table, and the frequency is not higher than 5000 Hz. It is powerless for the test of the integration of the integral blisk or the integral blade ring of a certain model. An electromagnetic vibration table is required for the excitation frequency exceeding 5000 Hz. It is difficult to achieve, even if the excitation over 5000Hz can be realized, the excitation energy is usually very small, and there is no technical solution for the excitation of the entire blade.

[0003] For the integral blisk and leaf ring technology widely used in a certain model, foreign countries have begun to study the whole-stage blade excitation method based on the rotor tester. Usually, a high-speed gas or liquid excitation nozzle with a stator is used. The high-frequency excitation obtained by this method The frequency can reach more than 10,000 Hz, but the power of the driving motor is high, and it is carried out in a vacuum box. The test box needs to be vacuumed, and the test cost is relatively high. The safety of the test piece cannot be guaranteed under high-speed rotation.

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