A fiber composite board nonlinear internal resonance characterization test method and test system

Abstract

The invention discloses a testing method and a testing system for nonlinear internal resonance representation of fiber composite boards. The method includes selecting internal resonance inherent frequencies of two steps of a composite board, and pre-determining dimension parameters and material parameters, for forming internal resonance of the composite board, according to an integral-multiple coordination method; processing the composite board; testing the internal resonance inherent frequencies of the two steps of the composite board; judging whether the internal resonance inherent frequencies of the two steps are in integral-multiple relation or not, and if not, adjusting the clamping position of the composite plate slightly and retesting the internal resonance inherent frequencies of the two steps of the composite board to enable the internal resonance inherent frequencies of the two steps to have integral-multiple relation; performing internal resonance representation testing on the composite board under different stimulation conditions, analyzing vibration characteristics of nonlinear internal resonance, and concluding change rules of nonlinear vibration response. By the testing method, an integral-multiple coordination theory is provided to calculate the inherent frequency of the composite board, specific parameters of the composite board are determined, and accordingly,testing accuracy and efficiency are high.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, and in particular relates to a nonlinear internal resonance characterization testing method and testing system of a fiber composite board. 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 engineering practice, such as solar panels, aeroengine fan blades, and large wind turbine blades, etc. , At present, there are a large number of typical composite thin plate structural parts made of this type of material in engineering practice. However, because fiber reinforced composites are different from conventional materials, their properties have obvious anisotropy, and their macroscopic thin plate structures exhibit a series of dynamic phenomena that are not found in linear systems, such as hysteresis and jumping, subh...

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Problems solved by technology

[0005] From the currently available information, people have carried out some research on the utilization and analysis of nonlinear internal resonance, but most of the inventions have not clarified the necessary conditions for the formation of internal resonance, and some internal resonance analysis and research only focus on vibration response However, a set of scientific and reasonable characterization test methods have not been formed to effectively obtain the nonlinear internal resonance phenomenon

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