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Research on Mass Flow of Gas-solid Flow-Measurement of the Concentration

Author: JiaWei
Tutor: HeZhongHai
School: Northeastern University
Course: Detection Technology and Automation
Keywords: Gas - solid flow Mass flow measurement Concentration measurement Piezoelectric Accelerometer Random signal analysis methods
CLC: TH814
Type: Master's thesis
Year: 2009
Downloads: 113
Quote: 0
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Abstract


Gas - solid two-phase mass flow measurement in industrial production and scientific research has an important significance. Piezoelectric Accelerometer combines random signal analysis methods for the realization of the gas - solid two concentration measurements provide an effective solution with high research and application value. In this paper, in-depth study of piezoelectric accelerometer sensing mechanism based on the use of piezoelectric acceleration sensor combines random signal analysis method to establish a set of gas - solid two concentration measurement system, and the system has been a lot of experiments and debugging. After concentration measurement system for collecting the signal in-depth analysis and research, selected power spectral density analysis method, wavelet analysis and statistical analysis of experimental phenomena and results are analyzed. For the problems found in the signal analysis algorithm has been improved and validated to find a suitable analysis algorithms. Numerical characteristics of random signals using statistical algorithms - mean-variance method simulation of the sampling data obtained relationship between the concentration and displayed online. This paper completed the following tasks: 1. On the gas - solid two-phase mass flow measurement of relevant background for a full investigation and research, choose gas - solid two concentration measurement as a research point. 2 pairs of piezoelectric acceleration sensor and electret microphone in-depth study to compare the advantages and disadvantages of both, to determine the selection of Piezoelectric Accelerometer sensor measurement system as a whole, the correctness. 3 of the entire measurement system hardware circuit design for a long time and debugging, including pre-stage amplifier circuit, 50Hz notch circuit, high-pass filter circuit, a low-pass filter circuit, PGA amplifier circuit, span adjustment circuit, emitter follower output circuit and limiter circuit design and debugging. 4 of the sampling signal spectrum analysis to determine the sampling frequency, the signal through the MCU samples the data transfer to the PC. 5 on the PC, the sampling data conducted an extensive analysis and research, selected random signal analysis methods in the power spectrum estimation method, wavelet analysis and statistical analysis of the sampling data processing. 6 in the algorithm and methods of analysis, based on a large number of experiments carried out to distinguish the sand flow and noise signals to determine the starting time of the flow of sand, obtained both qualitative and concentration variance relationship and line display processing results.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Thermal measuring instruments > Flow Meter
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