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A test method for a thin-walled cylindrical shell member vibration test system

A thin-walled cylinder and vibration testing technology, which is applied in the testing of machines/structural components, vibration testing, measuring devices, etc., can solve problems such as difficulties, low measurement efficiency, and low measurement stability, and achieve high measurement efficiency and stable measurement sex high effect

Active Publication Date: 2016-04-06
NORTHEASTERN UNIV LIAONING
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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

Method used

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  • A test method for a thin-walled cylindrical shell member vibration test system
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  • A test method for a thin-walled cylindrical shell member vibration test system

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1 , 2 , 3, a thin-walled cylindrical shell component vibration testing system, including a base 1, a laser Doppler vibrometer 2, a specimen mounting table 3, a vibrator 4 and a laser reflection unit, the laser multiple The Puler vibrometer 2 is arranged on the base 1, the test piece mounting platform 3 is arranged on the base 1, and the laser emitting end of the laser Doppler vibrometer 2 corresponds to the test piece mounting platform 3; The vibrator 4 is located on the side of the test piece mounting table 3; the laser reflection unit is arranged on the base 1 through a fixed bracket 12;

[0036] The laser reflection unit includes a reflector 5 and a transmission part. The transmission part includes a guide rail 11, a slider 10, a sliding plate 9, a lead screw 8, a screw nut 7 and a measuring arm 6. The guide...

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Abstract

A testing method of a vibration testing system for thin-walled cylindrical shell components, belonging to the field of laser Doppler vibration measurement technology. The laser Doppler vibrometer, the test piece installation platform and the laser reflection unit of the present invention are all arranged on the base. The laser emission end of the laser Doppler vibrometer corresponds to the test piece installation platform; the guide rail of the laser reflection unit The screw and the screw are fixed on the fixed bracket, the slider is fixed on the slide plate, and the slide plate slides and cooperates with the guide rail through the slider; the screw nut is set on the screw, and the nut is fixedly connected to the lower surface of the slide plate; measurement One end of the arm is fixed on the surface of the slide, and the measuring arm, screw and guide rail are all set in parallel; the reflector is set on the other end of the measuring arm, and the reflector forms an angle of 45° with the vertical direction. Laser Doppler vibrometer The laser emitting end corresponds to the reflector; a first drive motor is installed between the reflector and the measuring arm, and the output shaft of the first drive motor is firmly connected to the reflector; a second drive is installed at the shaft end of the screw motor.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
Inventor 罗忠于长帅王菲于清文朱云鹏
Owner NORTHEASTERN UNIV LIAONING
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