Wood damage monitoring method based on acoustic emission technique

Abstract

The invention discloses a wood damage monitoring method based on an acoustic emission technique. The method specifically comprises the following steps: arranging an acoustic emission sensor on the surface of a wood stress concentration part; collecting weak acoustic emission signals generated by wood damages; amplifying and filtering the collected acoustic emission signals, carrying out analogue-to-digital conversion, and then transmitting the converted signal to an FIFO in an FPGA control module and buffering; uploading data to an upper computer through a wireless transmission module; carrying out wavelet noise reduction and reconstitution on the collected acoustic emission signals collected by the upper computer; positioning a wood-damage acoustic emission source by a linear positioning method, and monitoring the position of the wood-damage acoustic emission source in real time through a human-computer interaction interface designed by LABVIEW; and extracting energy characteristic values form the collected acoustic emission signals by the upper computer by virtue of a wavelet packet analysis system, constructing a corresponding training sample set, building a neural network, and predicting and analyzing the variation trend of the acoustic emission signals of wood stress damages through accumulated energy so as to deduce the positions of the wood damages.

Description

technical field [0001] The invention relates to the field of wood, in particular to a wood damage monitoring method based on acoustic emission technology. Background technique [0002] In the United States, wood structure buildings are in a dominant position in the market and are widely used to build houses, factories, schools, hotels, commercial buildings, gymnasiums, etc. In Canada, the timber industry is one of the country's pillar industries. The industrialization, standardization and supporting installation technology of its timber structure housing are very mature. In Finland and Sweden in northern Europe, 90% of the residential buildings are one-story or two-story wooden structures. In Japan, too, there are a large number of wooden buildings, even in densely populated Tokyo. In our country, there are many ancient buildings with wooden structures, which are treasures of human history. [0003] Today, with the continuous development of urban landscape, people have hig...

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Problems solved by technology

[0005] However, wood also has the characteristics of shrinking when dry, expanding when wet, and anisotropy. When used for a long time, it is prone to cracking, distortion and other damage in the air, and there are certain safety risks.

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