One-dimensional spherical granular chain nonlinear solitary wave sensor

Abstract

The invention discloses a one-dimensional spherical granular chain nonlinear solitary wave detection sensor, which can realize the stable excitation and detection of nonlinear solitary waves and is used for the nondestructive detection of materials or structures. Shock particles are controlled by an electromagnetic valve to shock a one-dimensional spherical granular chain from a fixed height in a free falling body manner to form nonlinear solitary waves propagating along the one-dimensional spherical granular chain, when the nonlinear solitary waves are propagated to observation particles, a displacement of the solitary waves can be sensed by a piezoelectric material embedded in the observation particles, can be outputted in a voltage form and is called incidence solitary waves; when the nonlinear solitary waves propagated to an interface of the particles on the tail end of the one-dimensional spherical granular chain and the material or structure to be detected, reflection is generated, the nonlinear solitary waves re-enter the one-dimensional spherical granular chain, the nonlinear solitary waves can be re-sensed by the piezoelectric material in the observation particles in the propagation process, and an output voltage signal is called reflection solitary waves. By utilizing a flying time difference or an amplitude ratio between the reflection solitary waves and the incidence solitary waves, nondestructive evaluation can be performed for the rigidity or damage of the material or structure to be detected.

Description

technical field [0001] The invention relates to a one-dimensional spherical particle chain type nonlinear solitary wave detection sensor, which belongs to the technical field of non-destructive testing. The incident and reflected solitary wave signals recorded by the piezoelectric material can be used for non-destructive evaluation of the material or structure to be tested. Background technique [0002] The multilayer board bonding structure is widely used in high-end aerospace equipment. When there is damage inside the structure or debonding occurs between layers, the local properties of the material (such as density, stiffness, etc.) will change. At present, the general non-destructive testing method for damage or debonding between layers in the bonded structure of multilayer boards is mainly ultrasonic method. Generally, a piezoelectric ultrasonic transducer is used to excite ultrasound, and a couplant is required. The excitation source of the piezoelectric ultrasonic t...

AI Technical Summary

Problems solved by technology

The excitation source of the piezoelectric ultrasonic transducer generally includes a precise and complex signal generator and amplifying circuit, etc. The received ultrasonic reflection signal generally has a low amplitude, which is easily affected by noise interference and affects the detection effect of local damage or debonding

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