A visualization experiment platform for vibration energy transfer characteristics of thin-wall casing structure

Abstract

The invention relates to a visualization experiment platform for the vibration energy transfer characteristics of a thin-walled casing structure, which is especially suitable for thin-walled casings of aero-engines, and can realize the global vibration of the thin-walled casing structure under different support conditions, excitation positions and vibration excitation types Experimental study on visualization of energy transfer characteristics. The experimental platform consists of a thin-wall casing structure body coated with optical pressure-sensitive coatings, an optical transparent vacuum box, an exciter, a laser light source, a charge-coupled device (CCD camera), and an image acquisition and control unit. The thin-walled casing structure with optical pressure-sensitive coating is vibrated by the exciter, and the pressure-sensitive coating is excited by the laser light source. In the vacuum environment, the CCD camera captures the sound pressure change on the surface of the thin-walled casing structure and transmits it to the image acquisition. With the control system, the vibration energy transfer vector field diagram of the thin-walled casing structure is obtained, and then the vibration energy transfer characteristics of the thin-walled casing structure are obtained.

Description

Technical field [0001] The present invention belongs to the field of experimental technology of receiver dynamic characteristics, involving a thin-walled receiver structural dynamic characteristics experimental device, in particular involving a thin-walled receiver structure vibration energy transfer characteristics experimental platform, especially suitable for aero-engine thin-walled receiver, to achieve the aircraft engine thin-walled receiver structure under the action of excitation force global vibration energy transfer path visualization, to obtain global vibration energy transfer characteristics, to achieve effective control and suppression of thin-walled receiver vibration, and then to achieve thin-walled receiver structure in a variety of fixed support methods 2. Experimental research on the visualization of global vibration energy transfer characteristics under excitation load, which provides experimental measurement scheme and hardware support for the analysis of the dy...

AI Technical Summary

Problems solved by technology

The contact method mainly uses strain gauges, acceleration sensors and other equipment installed on the surface of the structure for direct measurement. The quality, damping and other characteristics of these sensors will directly affect the vibration response of the measured structure, thereby affecting the measurement accuracy and accuracy of the vibration energy transfer characteristics. , and this local point measurement cannot derive the global vibration energy transfer characteristics of the vibrating structure

The non-contact method mainly uses hydrophones, laser Doppler velocimeters and other equipment for indirect measurement. Most of them are based on acoustic or optical principles. The post-processing of measurement data such as noise and reconstruction is cumbersome, which limits the application of this method in nonlinear structures such as flange contacts.

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