An Algorithm for Synthesizing Excitable Gas Pressure Based on Sound Relaxation Frequency

doi:10.19596/j.cnki.1001-246x.7948

Abstract

Abstract: Sound relaxation frequency is frequency of peak point in sound absorption spectrum, which contains information of gas composition, ambient temperature, and pressure in excitable gases. With characteristics of sound relaxation frequency is linearly in proportion to gas pressure, we propose an algorithm for synthesizing gas pressure by acoustic relaxation frequency calculated with absorption coefficients and sound speeds at two frequencies. Measurement error of sound relaxation frequency is proportional to acoustic measurement error. Specially, as sound absorption measurement errors at the two frequencies are equal, error of synthesized pressure is zero. For methane and its mixtures at a certain temperature, simulation results demonstrate effectiveness of the algorithm and its robustness to acoustic measurement errors. Thus, a novel acoustic method, which is simple, robust, and capable of on-line to detect pressure of excitable gas vessel, is provided.

Key words: sound relaxation frequency, gas pressure, acoustic measurement, gas pressure vessel

CLC Number:

O424

ZHANG Kesheng, ZHANG Shigong, ZHANG Xiangqun, ZHOU Zhengda. An Algorithm for Synthesizing Excitable Gas Pressure Based on Sound Relaxation Frequency[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(6): 699-706.

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