Research on Signal Attenuation Model and Transfer Characteristics for Continuous Vibration Signal Inside a Pipeline

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (19) : 84-90.

LiuJun1,2 YuanFeng2

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Abstract

In this paper, impedance and transmission coefficient of power line transmission theory are used to describe the continuous pressure vibrations in the transfer process of the pipeline. The continuous wave attenuation model, which by using characteristic impedance describes the influence of the pipeline’s property on the wave propagation, is established based on the transfer matrix. According to the attenuation model, this paper analyzes the relationship between pressure and flow while the continuous waves move along the pipeline, and the influence of terminal impedance and dip angle of pipelines on the wave transmission. Through the simulation and calculation on the model, it is concluded that pressure waves are in the standing wave distribution in the pipe when the continuous wave signal is transmitting in the pipeline. At the same time, the volatility transmissions under the different terminal impedances are analyzed. The amplitude-frequency characteristic curve of the signal transmission in the pipe is mapped by analyzing the distribution in different frequency signals in the pipeline. It can get a conclusion. The conclusion is that the signal in the pipe is in the attenuation volatility with the increase of frequency. And through the experiment on the ground, the situations about signal transmission of different frequencies in the same pipe are accord with the simulation analysis. This paper provides the theoretical support for the selection about the frequency of communication in the process of measurement while drilling.

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LiuJun1,2 YuanFeng2. Research on Signal Attenuation Model and Transfer Characteristics for Continuous Vibration Signal Inside a Pipeline[J]. Journal of Vibration and Shock, 2015, 34(19): 84-90

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