Broadband Lamb wave excitation signal generator applied to structural health monitoring

A technology of health monitoring and broadband excitation, which is applied in the generation of ultrasonic/sonic/infrasonic waves, can solve the problems of high performance requirements of DC/DC modules, high cost, and inability to meet the requirements of system miniaturization, so as to reduce the power of the system. The complexity and cost of consumption and integration, the effect of improving stability and ensuring functional completeness

Active Publication Date: 2011-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

The first implementation of the power module cannot meet the requirements of system miniaturization; the second implementation has high requirements on the performance of the DC / DC module, because the module must upgrade the low voltage to a high voltage, and the gap between the two voltages is relatively large. Large, the module must have a rated power of more than 50W to continuously provide a stable power supply for the high-frequency power amplifier circuit, so the cost is relatively high

Method used

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  • Broadband Lamb wave excitation signal generator applied to structural health monitoring
  • Broadband Lamb wave excitation signal generator applied to structural health monitoring
  • Broadband Lamb wave excitation signal generator applied to structural health monitoring

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Embodiment approach 1

[0028] Such as figure 2 As shown, the high-voltage broadband Lamb wave excitation signal generator based on PCI / CPCI / PC104+computer system bus of the present embodiment includes a PCI bus interface module, a single-chip microcomputer, a high-voltage broadband excitation signal output module, a DC / DC power supply module and an output channel break control module, the overall implementation scheme is as follows image 3 shown.

[0029] The PCI bus interface module is directly realized by the PCI bus bridge chip and its peripheral auxiliary circuits.

[0030] An 8-bit single-chip microcomputer is used as the core of the logic management module, and the high-voltage broadband excitation signal output module and the output on-off control module are programmed through the commands transmitted by the PCI bus interface module. When the excitation signal is output, the single-chip microcomputer first sends out the output on-off control signal to drive the output on-off control modul...

Embodiment approach 2

[0042] Such as figure 2 As shown, the high-voltage broadband Lamb wave excitation signal generator based on the USB computer external bus of this embodiment includes a single-chip microcomputer, a high-voltage broadband excitation signal output module, a DC / DC power supply module, and an output on-off control module. The overall implementation scheme is as follows Figure 5 shown.

[0043] The USB bus interface communication is realized directly by the USB bridge module inside the microcontroller. The single-chip microcomputer directly performs program control on the high-voltage broadband excitation signal output module and the output on-off control module. When the excitation signal is output, the single-chip microcomputer first sends out the output on-off control signal to drive the output on-off control module to open the output signal channel, delay N 1 clock cycle ( N 1 According to the clock setting of the single-chip microcomputer, it is advisable to achieve a de...

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Abstract

The invention discloses a broadband Lamb wave excitation signal generator applied to structural health monitoring, comprising a computer bus interface module, a logic management module, a high-voltage broadband excitation signal output module, a DC / DC (Direct Current / Direct Current) power supply module and an output on-off control module, wherein a computer bus communication interface module is connected with a computer bus; the logic management module is connected with the computer bus interface module; the DC / DC power supply module is subjected to voltage conversion after receiving a bus low-voltage direct current power supply; the bus low-voltage direct current power supply directly provides low-voltage power supply to the high-voltage broadband excitation signal output module; and thehigh-voltage broadband excitation signal output module generates a high-voltage broadband excitation signal to drive a piezoelectric element to work. By using the invention, cost and power consumption of an integrated structural health monitoring integrated system based on the piezoelectric element and an active Lamb wave can be reduced, reliability and integration of software and hardware of theintegrated system can be improved, and the development of a portable structural health monitoring system and the realization of an aircraft carried structure health monitoring system can be promoted.

Description

technical field [0001] The present invention relates to a broadband Lamb wave excitation signal generator applied in the field of structural health monitoring, in particular to a broadband excitation signal generator with low power consumption, miniaturization, and high output voltage, which can be based on a computer bus and whose signal output can be switched on and off. device. Background technique [0002] In the field of structural health monitoring, active Lamb wave structural health monitoring methods based on piezoelectric elements are very sensitive to small structural damages, such as metal cracks and composite material delamination, and are currently one of the research and application hotspots at home and abroad. Piezoelectric elements are used as both driving and sensing elements in active Lamb wave structural health monitoring methods. When it is used as a driving element, the structural health monitoring system inputs an excitation signal to it, triggering it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34
Inventor 邱雷袁慎芳王昊董晨华刘沛沛王长春
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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