Impact monitoring system using digital random demodulation and split recovery algorithm

A technology of shock monitoring and random demodulation, which can be used in shock testing, testing of machine/structural components, and measurement of properties using piezoelectric devices. It can solve problems such as high computational complexity.

Active Publication Date: 2020-01-14
HOHAI UNIV CHANGZHOU
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  • Abstract
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Problems solved by technology

However, the basic pursuit of convex optimization often has high computational complexi...

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  • Impact monitoring system using digital random demodulation and split recovery algorithm
  • Impact monitoring system using digital random demodulation and split recovery algorithm
  • Impact monitoring system using digital random demodulation and split recovery algorithm

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Embodiment 1

[0086] Such as Figure 8 Shown is a general diagram of the system structure in Embodiment 1. Embodiment 1 Select a T-30 carbon fiber composite laminate as the monitoring object, and arrange four piezoelectric sensors on its surface to form a square array. The composite laminate was a square with a diameter of 160 cm and a thickness of 25 cm. A PZT-5 piezoelectric sheet with a diameter of 0.8 cm is selected as the piezoelectric sensor. The piezoelectric sensors are distributed at the four corners of a square with a side length of 100 cm, and the distance between each piezoelectric sensor and the edge of the plate is 30 cm. In this embodiment, a small steel ball is vertically dropped in the monitoring area composed of four sensors to simulate the external impact on the laminated board. The charge amplifier model YE5853 is connected to four piezoelectric sheets to collect the charge signal accumulated by the piezoelectric sensor due to the positive piezoelectric effect of the e...

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PUM

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Abstract

The invention proposes an impact monitoring system using a digital random demodulation and split recovery algorithm, and the system comprises an impact monitoring front end, a sampling trigger module,a signal conversion module, a digital random sampler, a host computer and other modules, wherein the impact monitoring front end and the sampling trigger module realize the real-time monitoring of animpact signal, and record the required information for the processing at the next layer structure; the signal conversion module converts the received voltage analog signal into a ternary signal basedon the level change of its amplitude and inputs the ternary signal into the digital random sampler; the digital random sampler performs compressed sampling on the ternary signal by digital random demodulation; and the upper computer implements algorithm recovery that can process the sampled signals in parallel, and accurately inverts the original impact signal waveform at high speed.

Description

technical field [0001] The invention relates to an impact monitoring system adopting digital random demodulation and split recovery algorithm, which belongs to the field of structural health monitoring. Background technique [0002] Structural health monitoring is a means of continuously monitoring objects to increase human safety and reduce maintenance costs. In civil and industrial buildings, structural health monitoring systems provide information on changes in individual components or entire structures due to material aging, environmental effects or accidental events. In the aerospace industry, carbon fiber reinforced polymer composites are very common in the main structure of modern aircraft, but the disadvantage is that their complex laminate structure makes their damage mechanism more complicated than that of classical materials. Therefore, it is important to monitor different forms of composite materials in real time to ensure that component failure does not occur d...

Claims

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Application Information

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IPC IPC(8): G01M7/08G01L5/00G01L1/16H03M7/30
CPCG01L1/16G01L5/0052G01M7/08H03M7/3062
Inventor 梁栋蔡宇航陈晓琦刘淼冯祯钰詹啸强
Owner HOHAI UNIV CHANGZHOU
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