Cylindrical shell modal vibration sound radiation testing device based on laser scanning

Abstract

The invention discloses a cylindrical shell modal vibration sound radiation testing device based on laser scanning, relates to the field of cylindrical shell modal vibration acoustic radiation testingdevices. The device comprises an excitation device, a laser vibration meter, a laser vibration meter translation device, a shell rotating device, a data acquisition analyzer, a microprocessor and a stabilized voltage supply, wherein the shell rotating device is located at the upper end of the excitation device, and the laser vibration meter is located above the shell rotating device. Characteristic parameters such as modal shape, inherent frequency and damping of cylindrical shell vibration under any boundary condition are measured by utilizing test devices such as an excitation device, a laser vibration meter, a laser vibration meter translation device, a shell rotating device, a data acquisition analyzer and a microprocessor; sound pressure (near field or far field) or sound power can be directly measured through experiments, or the sound pressure (near field or far field) or sound power generated by vibration of the cylindrical shell can be indirectly calculated by measuring the vibration speed of the shell, and certain use prospects are achieved.

Description

Technical field [0001] The invention relates to the field of cylindrical shell modal vibration and acoustic radiation testing devices, in particular to a cylindrical shell modal vibration and acoustic radiation testing device based on laser scanning. Background technique [0002] Cylindrical shells are typical engineering structural parts, which are widely used in aviation, aerospace and other general mechanical equipment, such as aircraft engine casings, various cabins of spacecraft, and drums in granulators to obtain the modalities of cylindrical shells The mode shape is of great significance to the dynamic design and vibration suppression of this type of structure. For a long time, the test of the mode shape of the cylindrical shell mainly adopts the method provided by the general experimental modal analysis theory, that is, by testing each response The frequency response function of a point is used to identify the mode shape. Among them, the use of hammer or electromagnetic e...

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Problems solved by technology

[0002] Cylindrical shells are typical engineering structural parts, widely used in aviation, aerospace and other general mechanical equipment, such as casings of aero-engines, various cabins of spacecraft, and drums in granulators, to obtain the modal of cylindrical shells The mode shape is of great significance to the dynamic design and vibration suppression of this type of structural parts. For a long time, the test of the mode shape of the cylindrical shell mainly adopts the method provided by the general experimental modal analysis theory, that is, by testing each response The frequency response function of the point is used to identify the mode shape. The most common method is to use a hammer or an electromagnetic exciter to stimulate the test. This traditional method of testing the mode shape is not very accurate. Therefore, we A laser-scanning modal vibration-acoustic radiation testing device for cylindrical shells is proposed

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