摘要:
在范式气枪模型中,范德瓦尔斯修正量通常被作为常量,但实际上却是随着温度的不同而改变的。基于范德瓦尔斯非理想气体理论,将气枪内的气体看作范德瓦尔斯非理想气体,在准静态开放式热力学系统和气泡振荡理论的基础上,建立范氏气体子波模型,重点剖析了范德瓦尔斯修正量随温度的变化规律,并将拟合函数引入范氏气体子波模型以进行改进。经模拟实例分析对比表明,所得的改进模型的计算结果相对于范氏气体模型与实测子波波形非常接近,从而验证了改进模型的可靠性,为气枪子波模拟的进一步分析提供可靠依据。
Abstract:
The Van der Waals corrections in the Van air-gun wavelet models are usually assumed as constants. However, they actually alter with the change in temperature. Through the actual measurement of the gas in the experiment, we utilized the conversion relationship between the virtual coefficient and Van der Waals corrections, and discovered the change value that Van der Waals corrections alter with the change in temperature, and it should not be ignored in the research. The actual gas follows the ideal gas equation approximately at ordinary temperatures and pressures, therefore, we introduced the Van der Waals gas equation. In this research paper, gas in the guns is regarded as a Van der Waals Gas by Van der Waals Gas Theory. Based on the open quasi-static thermo-dynamical system and the bubble oscillation theory, the wavelet model of the Van der Waals Gas is established. The changes of Van der Waals corrections with temperature are analyzed in details, and the wavelet model of the Van der Waals Gas is improved by leading into fitting function. Through analysis and comparison of simulation examples, it manifests that the result of improved model is close to the measured wavelet and relative to that of the wavelet model of the Van der Waals Gas. Thus, the reliability of the improved model is valid, and it will provide the reliable foundation for the further analysis of the air-gun wavelet simulation.
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