Vibration testing system and method for thin-wall cylindrical shell component

Abstract

The invention relates to a vibration testing system and method for a thin-wall cylindrical shell component, and belongs to the technical field of laser Doppler vibration measurement. A laser Doppler vibrometer, a test piece mounting table and a laser reflecting unit are all arranged on a base, and the laser emitting end of the laser Doppler vibrometer corresponds to the test piece mounting table. Guide rails and a lead screw of the laser reflecting unit are both fixedly arranged on a fixing support, sliding blocks are fixedly arranged on a sliding carriage, and the sliding carriage is in sliding fit with the guide rails through the sliding blocks. A nut is arranged on the lead screw in a sleeved mode, and the nut is fixedly connected to the lower surface of the sliding carriage. One end of a measurement arm is fixedly arranged on the upper surface of the sliding carriage, and the measurement arm, the lead screw and the guide rails are all arranged in parallel. A reflecting mirror is arranged at the other end of the measurement arm, a 45-degree included angle is formed between the reflecting mirror and the vertical direction, and the laser emitting end of the Doppler vibrometer corresponds to the reflecting mirror. A first drive motor is mounted between the reflecting mirror and the measurement arm, and an output shaft of the first drive motor is fixedly connected with the reflecting mirror. A second drive motor is arranged at the shaft end of the lead screw.

Description

technical field [0001] The invention belongs to the technical field of laser Doppler vibration measurement, in particular to a vibration testing system and testing method for a thin-walled cylindrical shell component based on the laser Doppler vibration measurement technology. Background technique [0002] In the field of aerospace, engine R&D and design are very important. In the process of engine R&D and design, vibration testing of engine parts is an important part, and engine parts also contain a large number of thin-walled cylindrical shell components , such as engine casings, etc., relevant technical personnel need to perform vibration tests on these thin-walled cylindrical shell components to obtain the relevant vibration characteristics of the thin-walled cylindrical shell components. [0003] At this stage, laser Doppler vibrometers are often used to perform vibration tests on these thin-walled cylindrical shell components, but this method of vibration measurement h...

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Problems solved by technology

[0003] At this stage, laser Doppler vibrometers are often used to perform vibration tests on these thin-walled cylindrical shell components, but this method of vibration measurement has obvious shortcomings when facing thin-walled cylindrical shell components

First of all, it is difficult for the laser Doppler vibrometer to perform 360° circumferential measurement of thin-walled cylindrical shell components, so it is even more difficult to achieve full-field measurement and frequency response function measurement; secondly, it is difficult to guarantee The laser emitted by the laser Doppler vibrometer can be vertically incident on the outer surface of the thin-walled cylindrical shell member, resulting in low measurement efficiency and low measurement stability

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