Subharmonic detection method for false sticking damage of repairing patch
A detection method, sub-harmonic technology, applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, instruments, analysis materials, etc. It can solve the problems of false damage and other problems, and achieve improved effectiveness, strong anti-interference ability, and high accuracy Effect
Inactive Publication Date: 2018-11-16
武汉珈鹰智能科技有限公司
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The traditional harmonic detection method is easily affected by the background noise brought by the measurement link, resulting in false damage alarms, while the sub-harmonic can only be generated when the impact and vibration at the solid interface are in contact with the vibration and under specific excitation conditions. The test link is irrelevant, making subharmonic waves more suitable for the detection of virtual adhesive damage on the bonding interface
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0031] Step 1. In order to simulate the overall wall panel of the aircraft wing, take as figure 1 The aluminum alloy rectangular plate shown is used as the base material, the size is 400mm*200mm*5mm, the repair piece is made of the same aluminum alloy material as the base material, and the square aluminum plate with a side length of 50mm and a thickness of 1mm is pasted on the geometric center of the base, and the repair piece and A virtual adhesive area with a diameter of 20 mm is prefabricated at the substrate bonding interface. to be tested as figure 1 Paste two piezoelectric sheets on the positions shown, as the excitation terminal 5 for transmitting signals and the receiving terminal 6 for receiving signals, which are recorded as the test piece 1;
[0032] Step 2: Use the signal generator 3 and the power amplifier 4 to apply a linear frequency sweep excitation with a frequency range of 0-50KHz to the test piece 1, and observe the frequency domain peak value of the respon...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a subharmonic detection method for the false sticking damage of a repairing patch. The method concretely comprises the following steps: 1, two piezoelectric patches are pastedto corresponding positions of the substrate material of a test piece to be detected as an excitation end of a transmitting signal and a receiving end for receiving a response signal; 2, a signal generator is used to transmit the signal, the signal is amplified by a power amplifier, the bonding structure of the base material of the test piece to be detected and the repairing patch undergoes sweeping excitation, and an oscilloscope receives the response signal, and determines the longitudinal natural frequency k maximally responded by the test piece; 3, sinusoidal signal excitation with an excitation frequency of 2 k is applied to the bonding structure of the base material of the test piece and the repairing patch, and collected signal data is processed by a computer; 4, a response spectrogram is obtained; and 5, the response spectrogram obtained in step 4 is analyzed. The method adopts subharmonic waves to identify the damage, is not affected by an actuator or a measuring link, has strong anti-interference ability, and can highly accurately identify the false sticking of the bonding structure.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a sub-harmonic detection method for virtual adhesive damage of a patch. Background technique [0002] During the service process, the overall wall plate of the aircraft wing and other related structures are easily affected by the working load and the environment, resulting in cracks and other damage forms. Using repair sheets to bond and repair the damaged part of the overall wall plate of the aircraft wing can improve the damage of the damaged part. Strength, can prolong life appropriately. However, during the bonding and repairing process or the service process of the patch, it is easy to have virtual sticking at the bonding interface, which leads to potential safety hazards in the structure. Therefore, real-time health monitoring of patches is of great significance. In recent years, the damage detection technology of structures has attracted the attention of ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/12
CPCG01N29/12G01N2291/0289
Inventor 江汶王芝吴维亮刘俊毅
Owner 武汉珈鹰智能科技有限公司