Wood damage monitoring device based on acoustic emission technique

Abstract

The invention relates to a wood damage monitoring device based on an acoustic emission technique. The wood damage monitoring device comprises a wood damage signal acquisition system based on acoustic emission and an analysis and monitoring system; the wood damage signal acquisition system comprises an acoustic emission sensor, a pre-amplifier, a filter circuit, a main amplifying circuit, an analog-to-digital conversion circuit, an FPGA (Field Programmable Gate Array) control module and a wireless transmission module, wherein the acoustic emission sensor selects an ultrasonic wave sensor with the frequency of 60 Hz-400 KHz and the central frequency of 150 KHz; the analysis and monitoring system comprises a wood damage source positioning analysis module and an accumulative energy prediction analysis module, wherein the wood damage source positioning analysis module can carry out wavelet denoising and reconstruction on an acquired acoustic emission signal, then position an acoustic emission source by adopting a linear positioning method and display on a wood damage acoustic emission source positioning monitoring interface; the accumulative energy prediction analysis module is used for extracting energy characteristic values of the acoustic emission signal by applying wavelet packet analysis to construct a neural network and to realize the valid prediction of accumulative energy of the wood stress acoustic emission signal through predicting accumulative energy values, so that effective data is provided for monitoring, corresponding prevention measures are conveniently taken, and the loss caused by wood damage is avoided.

Description

technical field [0001] The invention relates to the field of wood, in particular to a wood damage monitoring device 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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