Fiber composite thin plate nonlinear vibration characterization test method based on vibration measurement with laser

Abstract

The invention relates to a fiber composite thin plate nonlinear vibration characterization test method based on vibration measurement with laser, First, the inherent frequency and modal shape of a fiber composite thin plate needs to be obtained accurately. Then, a nonlinear vibration characterization test is carried out according to a test idea of from a time domain to a frequency domain and thento a time-frequency domain. The specific steps are as follows: testing inherent frequency of each order of the fiber composite thin plate; testing the modal shape of each order of the fiber compositethin plate according to the inherent frequency; carrying out a harmonic distortion nonlinear characterization test; carrying out a nonlinear time-varying damping characterization test; carrying out ahard / soft rigidity nonlinear characterization test; carrying out a characterization test of amplitude dependent on nonlinear damping; carrying out a nonlinear jump characterization test; carrying outan ultraharmonic / subharmonic resonance nonlinear characterization test; and carrying out an internal resonance nonlinear characterization test. The method provided by the invention can obtain variousnonlinear vibration characterization of the fiber composite thin plate through one-time testing, a test result is relatively accurate, the test efficiency is improved, and an important reference is provided for establishing a method system for a nonlinear vibration test of a composite structure of this type.

Description

technical field [0001] The invention relates to a vibration test technology, in particular to a laser vibration measurement-based nonlinear vibration characterization test method for a fiber composite thin plate. Background technique [0002] Fiber-reinforced composite materials have high specific strength, high specific modulus, good thermal stability, and certain damping and vibration reduction capabilities, so they are widely used in important fields such as aviation, aerospace, ships, and weapon industries. At present, there are a large number of typical composite thin plate structural parts made of this type of material in engineering practice, such as solar panels, aeroengine fan blades, and large wind turbine blades. However, because fiber reinforced composite materials are different from conventional materials, their properties have obvious anisotropy, and their macroscopic thin plate structures also exhibit vibration characteristics such as nonlinear stiffness and d...

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Problems solved by technology

[0004] At present, no technical solutions that can meet the above requirements have been reported.

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