| This thesis takes underwater explosion experiment as the research background,and uses air gun array instead of TNT for underwater explosion experiment as the research purpose,analyzes and summarizes the effects of different working conditions on air gun wavelet parameters and air gun array wavelet parameters,and optimizes the design of air gun array Methodological research.The main research contents are as follows.This thesis first summarizes the development history of air gun seismic source theory and the current research status of air gun wavelet numerical models at home and abroad,introduces the “free bubble oscillation theory”,explains the movement process of bubbles,and sorts out three classic single-gun wavelet ideal gas models,Ziolkowski(1998)model,Schulze-Gattermann model,Jonhson model,and through the numerical simulation of single-gun wavelet mode characteristics,comparative analysis of the three ideal gas models,the results found that the simulation results of the three ideal models are basically the same.Secondly,the Van der Waals gas single-gun wavelet model is revised,the initial conditions of the bubble are assumed,and the numerical simulation program of the Van der Waals gas single-gun wavelet is written.Using MATLAB software,the Van der Waals gas single-gun wavelet is performed.The numerical simulation of the model,and base on the experimental data of Wang Liming,prove the superiority of the modified model.Using the control variable method,the wavelet numerical simulation of the working pressure of the air gun,the sinking depth of the air gun and the volume of the air gun are carried out respectively,the influencing factors of the single-gun wavelet are studied,and the influence law of the working parameters of the Sleeve Ⅰ air gun is summarized.Then,aiming at the problem of the influencing factors of the tuning array wavelet,a numerical simulation program of the Van der Waals gas tuning array wavelet is written.Using MATLAB software,the numerical simulation of the Van der Waals gas tuning array wavelet is carried out,and the air gun is discussed.The superiority of the tuning array compared to the single-gun.Using the control variable method,the air gun working pressure,the total volume of the tuning array,the sinking depth of the tuning array and the array mode are respectively simulated by wavelet waves.The influence factors of the air gun tuning array wavelet are studied,the influence law of working parameters of the tuning array base on Sleeve Ⅰ air gun is summarized.Finally,a mathematical model for the optimization design of the tuning array is established,and the model algorithm is given.The three-gun tuning array is designed,and use the tuning array optimization mathematical model to optimize the design of the three-gun array.The verification and comparison analysis proves the accuracy of the optimization model.Aiming at the diversification of energy output requirements in underwater explosion experiments,optimization designs of six-gun tuning array and twenty-four-gun tuning array are carried out,and compare and analyze the advantages and disadvantages of planar arrays and spatial stereo arrays.On this basis,the equivalent calculation of the air gun array and TNT is carried out for the three array schemes,and the air gun tuning array design scheme is provided for the underwater explosion experiment. |
