A method for classifying ultrasonic echo signals at the mud-water interface of lead-zinc mine suction wells based on random forest

Abstract

The invention discloses a lead-zinc ore water absorption well mud-water interface ultrasonic echo signal classification method based on a random forest. The method includes the following steps of collecting the ultrasonic echo signals under different working conditions through an ultrasonic transducer installed under the water absorption well; performing the wavelet decomposition on the collectedsignals, calculating a threshold value by using a Hessian threshold value selection method, and performing coefficient processing by using a soft threshold value function, and then reconstructing thesignal to complete denoising; extracting the maximum value characteristic of the denoised signal; establishing a decision-making tree-based learning device by returned random extraction modulus maximum value characteristics and partial samples, forming the random forest classifier with a plurality of decision trees for signal classification. According to the invention, the classification accuracyof the echo signals is high, the operation cost is low, and great value is achieved for echo parameter estimation under different mathematical models.

Description

technical field [0001] The invention belongs to the field of ultrasonic detection, and in particular relates to an ultrasonic echo classification method for sludge in an underground water-absorbing well of a lead-zinc mine. Background technique [0002] The safety of mine drainage is an important factor affecting the safe production of mining areas. Underground drainage is very important to the safety of underground workers and equipment, and is the most basic condition for underground operations. Due to underground mining and other reasons, the water in the well is relatively turbid. After the water accumulates in the water absorption well, it is easy to generate silt in the water absorption well. At present, the water level of the suction well is measured by an ultrasonic liquid level gauge, which gives the liquid level height by measuring the distance from the liquid level surface. This measurement method ignores the thickness of the silt deposited at the bottom of the we...

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Problems solved by technology

[0004] Ultrasonic ranging is based on the reflection signal generated when the ultrasonic signal encounters the measured object, and the distance between the ultrasonic probe and the measured object can be estimated according to the echo signal. At present, most ultrasonic ranging uses the threshold method to estimate the ultrasonic propagation time. In lead In the underground water absorption well of zinc mine, there are interferences of heavy metal particles and other underground impurities, and it is difficult to obtain accurate information by using the traditional threshold method

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