A multi-channel percussion detection device for a composite material adhesive structure

Abstract

The invention discloses a multi-channel knock detection device for a composite-material glue joint structure. The multi-channel knock detection device comprises a drive circuit, a conditioning circuit, N electromagnetic hammers and N knocking heads, the knocking heads are in correspondence with the electromagnetic hammers; two electromagnetic coils in each electromagnetic hammer are alternatively switched under the action of drive current of the drive circuit, alternating up-and-down electromagnetic force is generated, a metal slide is abstracted to drive the knocking heads to move in a vertical reciprocating manner, the surface of a to-be-detected piece is knocked through the knocking heads, a built-in piezoelectric sensor coverts a pressure signal into an electrical signal, the electrical signal is transferred to the drive circuit to be amplified and compared, and a modulating signal is output. The multi-channel knock detection device high in flexibility, knocking frequency and reliability can be used in the automatic detections system of the composite-material glue joint structure, cost is lowered, and efficiency is improved.

Description

technical field [0001] The invention relates to a multi-channel percussion detection device of a composite material bonding structure, which belongs to the application field of non-destructive detection. Background technique [0002] The bonded structure of composite materials is one of the important structures in the development and production of aerospace model products. Widely used in launch vehicles, strategic missiles, and satellite products, such as rocket fairings and satellite brackets. Due to the manual operation and single-piece production of composite material bonding structural parts, and the production process conditions are difficult to strictly control, there are likely to be debonding defects inside the parts that affect the performance of the parts. Non-destructive testing of the bonding quality of bonded structural components is an important guarantee for model quality reliability. [0003] Ultrasonic water jet penetration, acoustic resonance, low-frequen...

AI Technical Summary

Problems solved by technology

However, the percussion hammer is artificially excited (knocked) to the structure under test, so different operators have different strengths

Although the operator is required to use continuous and appropriate strength as much as possible, it cannot completely eliminate the difference between the strength used by the same operator for each detection and the detection by different operators, and these differences are reflected in the original signal as the difference in signal amplitude

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