Diaphragm Pump Check Valve Of Acoustic Emission Signal Acquisition Monitoring And Analysis

The pipeline transportation is one of the most important modes of transport for iron ore that is iron and steel industrial raw materials. High-pressure reciprocating piston diaphragm is a core implementing agencies in pipeline transport which need to focus on maintenance monitoring. Use of acoustic emission techniques, the structure is relatively simple monitoring one-way valve, thereby indirectly monitoring the diaphragm. The acoustic emission of one-way valve belongs to high-frequency signals, which are detected by sensitive acoustic emission collect and monitoring equipment. Therefore, the core work of this paper is aimed at collecting acoustic emission signals of one-way valve, and its analysis for the purpose of fault diagnosis.This paper design an acoustic emission signal acquisition monitoring system based on STM32F103RB, which is32-bit microprocessor with Cortex-M3core. This paper simulates the normal operation and fault conditions, application of different analytical methods to diagnose fault conditions. Specific activities include the following:1) In this paper, the design of acoustic emission acquisition unit in the acoustic emission signal acquisition and monitoring system, achieved a multi-channel data parallel, real-time acquisition, high-speed transmission. The acquisition unit included the core control module, the analog signal acquisition module, AID conversion module and the data receiver and transmission module. The core control circuit design includes control the gain of amplifier circuit, control the clock between external AD chip and data cache chip, control the port of data acquisition, control the port of data output. This design is in line with the principles of high-speed, accurate, and targeted. During the design, the chip selection of the core control chip, acoustic emission sensors and AD chip, the design of two-stage amplifier circuit, the design of the data cache circuit and the design of the USB interface circuit, which all contribute to the implementation of the system performance.2) In this paper, we study in fault signal diagnostic methods. Based on the actual situation, the simulation of one-way valve acoustic emission signals both in normal operation conditions and fault operation conditions. The analysis method of fast Fourier transform, the analysis method of wavelet packet decomposition and wavelet packet combined with principal component analysis method apply to extract the fault characteristics in the simulated conditions. Prove that the three methods can be used for fault identification of the acoustic emission signals of one-way valve in the simulations. In practical applications, engineers and technicians can choose a different fault signal analysis methods, depending on the situation at the scene.3) In this paper, the design of the acoustic emission monitoring unit in the acoustic emission signal acquisition monitoring system, achieving monitoring of data and time-frequency analysis. The unit includes the Design and Implementation for the monitoring software, it can process the signals, analysis the results and display and preservation the image and the key points. The design of the monitoring software has characteristics with targeted and the fast processing speed. Confirmed the good performance of the acoustic emission monitoring software through professional sound processing software Adobe Audition3.0. Then, confirmed the accuracy of collected the signals of acoustic emission signal acquisition unit by the monitoring software and the standard signal generator. In a lab environment, test the entire acoustic emission acquisition and monitoring system, proved good system performance.This article was designed and implemented acoustic emission signal acquisition monitoring systems of diaphragm one-way valve, and simulation studies for fault signals recognition applications in three different analytical methods. We tested the system in a lab environment to prove that good system performance. The paper completed the acquisition monitoring and analysis for acoustic emission signals of one-way diaphragm valve. Finally, basis on summarized of the follow-up design work, make the prospect for failure identification work to the one-way valve, as well as the diaphragm.