Vibration detection device and method for fixed support plate at both ends based on optical fiber displacement measuring instrument

Abstract

The invention discloses a two-end fixing support plate vibration detection device and method based on an optical fiber displacement measurement instrument. The two-end fixing support plate vibration detection device comprises a flexible plate body part and a vibration detection part. The flexible plate body part comprises a flexible plate, a magnetic base, an optical fiber probe and a micrometer, the two ends of the flexible plate are fixed through mechanical clamping devices, the optical fiber probe is installed right ahead the flexible plate through a horizontal support and a vertical support, the distance between the optical fiber probe and the flexible plate is adjusted through the micrometer, and the vertical support is installed on the magmatic base. The vibration detection part comprises an optical fiber displacement measurement instrument system, an A / D data collecting card and a computer, vibration signals of the optical fiber probe are collected through the optical fiber displacement measurement instrument system, processed by the A / D data collecting card and transmitted to the computer, and the computer obtains low-order mode vibration of two-end fixing support plates through decoupling to be used for vibration analysis or control. By means of the two-end fixing support plate vibration detection device and method, decoupling of the two-end fixing support plates on low-order mode vibration detection is achieved in a non-contact detection mode.

Description

technical field [0001] The invention relates to the field of vibration detection of two-end fixed support plates, in particular to a vibration detection device and method for two-end fixed support plates based on an optical fiber displacement measuring instrument. Background technique [0002] With the rapid development of modern aircraft technology, the speed of aircraft is becoming more and more high-sonic or hypersonic. In order to reduce the structural weight, more thin-walled structures are used in the structural design of the new generation of high-speed aircraft. Due to the light weight and small modal damping of the thin-walled structure, coupled with the aerodynamic influence of high-speed airflow, it is easy to cause structural vibration or wall panels. flutter. Panel flutter refers to a self-excited vibration phenomenon of the panel structure (such as wing skin) of high-speed aircraft in supersonic airflow. When a high-speed aircraft vibrates due to uncertain di...

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Problems solved by technology

[0003] In order to suppress the flutter of the wallboard, it is necessary to detect the amount of vibration first. However, in the prior art, contact sensors are generally used to measure it, such as the detection of pasted piezoelectric ceramics, or the detection of installed acceleration sensors. The additional mass generated by the plate will change the structural characteristics of the wall plate. At the same time, the piezoelectric ceramic material is a brittle material, and the strength and fatigue life of the material are affected by the ambient temperature, so the application is subject to certain restrictions. The measurement noise of the acceleration sensor is relatively large. This requires filtering of the vibration signal

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