Two-stage noise reduction method for impact monitoring digital sequence of composite structure

A technology of digital sequence and structural impact, which is applied in the direction of measuring devices, instruments, special recording/indicating devices, etc., can solve the problems of false alarms, without any signal noise filtering and conditioning modules, and cannot accurately realize positioning, so as to reduce misjudgment and false alarms, the effect of improving accuracy

Active Publication Date: 2013-01-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] However, in order to meet the requirements of miniaturization and low power consumption, the system does not have any filtering and conditioning modules for signal noise in the hardware circuit. The external sensor array is directly connected to the comparator array in the system, and the shock location algorithm of the system relies solely on the corresponding Sequence of rising edges i

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  • Two-stage noise reduction method for impact monitoring digital sequence of composite structure
  • Two-stage noise reduction method for impact monitoring digital sequence of composite structure
  • Two-stage noise reduction method for impact monitoring digital sequence of composite structure

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Embodiment Construction

[0015] The noise reduction method of the present invention specifically follows the steps:

[0016] (1) Number sequence acquisition

[0017] The miniaturized digital large-scale sensor array shock monitoring system acquires digital sequences.

[0018] There are three reasons for the above sequence of numbers: Due to the shock, the sensor outputs a shock response signal, thereby obtaining a digital sequence through the comparator array inside the system; Due to the large noise amplitude of the sensor output, the digital sequence is obtained through the comparator array, and this digital sequence is generated purely due to noise; The mixture of large-amplitude noise and impulse response signals causes the comparator array to output a digital sequence that is caused by both the impulse response signal and the noise.

[0019] (2) First-level noise reduction of digital sequences based on Haar discrete wavelet transform

[0020] Carry out Haar discrete wavelet transform o...

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Abstract

The invention discloses a two-stage noise reduction method for an impact monitoring digital sequence for a miniature digital large-scale sensor array impact monitoring system. After the miniature digital large-scale sensor array impact monitoring system acquires a digital sequence, two-stage noise suppression is carried out on the digital sequence by using the method. Haar discrete wavelet transform is adopted in the first-stage noise suppression. A noise reduction method based on the feature digital sequence is adopted in the second-stage noise suppression. The distinguishing criterion for determining the feature digital sequences is as follows: the proportion of digital sequences equal to 1 (i.e., high level) is larger than R in digital sequences the rising edges of which last for a certain length of m. Based on the method, the accuracy of impact monitoring of the miniature digital large-scale sensor array impact monitoring system can be improved and erroneous judgment and false alarm to impact are reduced.

Description

technical field [0001] The invention relates to a noise reduction method for digital sequences acquired by a miniaturized digital large-scale sensor array impact monitoring system. The miniaturized digital large-scale sensor array impact monitoring system is suitable for airborne real-time impact area monitoring and impact event recording of large aeronautical structures, and belongs to the technical field of aeronautical structure health monitoring. Through the digital sequence two-stage noise reduction method of the present invention, the noise reduction of the digital sequence can be realized without adding any signal filtering, conditioning circuit or other noise reduction hardware modules, so that the system volume and power consumption are not increased. In the case of the system, the misjudgment and false alarm of the system on the impact of the structure are reduced. Background technique [0002] Composite materials have been widely used because of their advantages ...

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Application Information

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IPC IPC(8): G01D3/032
Inventor 邱雷袁慎芳钱伟峰梅寒飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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