Simulation On Wavelet And Optimization Of The Air Gun Array In Conditions Of Van Der Waals Gas

Abstract:According to the working principles of air guns, this thesis focuses on the parameter and evaluation methods of the air gun array, The mathematical model of air gun source of Van der Waals Gas, such as, single air gun model, establishment of the model of an air gun array and its solution, analysis on the impact factors of the air gun array wavelet, use experiments to optimize the air gun array.Firstly, the history of air gun array simulation, research status at home and abroad are reviewed in this paper. Then we analyzed the evaluation parameters of the signature, and the factors that affect the performance of an air gun array in details, and obtained a more general conditions that a good air gun arrays need to be met. Then the classification principles of the array is discussed. Through the comparison of the signature stimulated by the single gun and air gun arrays, the latter is superior to the former. Based on the theories and algorithms of the single air gun wavelet model of Van der Waals Gas, the theoretical model of tuned arrays and coherent arrays are established, and carried on the preliminary discussion for the numerical solution of coherent array model. Furthermore, by numerical simulation, we study the influence of working pressure, total capacity, sinking depth, and the different types of an array on the wavelet shape; Finally on the above mentioned basis, multi-gun and multi-sub array tuned air gun arrays are designed and experimented, in order to provide a reference to the design of the air gun array in actual measurements.The main result of this thesis is that based on the single gun wavelet model of Van der Waals Gas, the theoretical model of tuned air gun array is established, found the numerical simulation and spectrum analysis, this all provide theoretical support for the analysis of the signature of an array. In this thesis, we choose working pressure, total capacity, sinking depth and array type to perform parameter analysis, received the impact effect of these parameters to the wavelet. At last, based on these bases, we list three guns array, an array of six guns and four sub-bursts out for design experiments, for three gun array, the planar array is good than three dimensional array. After that, through orthogonal experiment, found out the best design scheme when working pressure and capacity have two levels. For six guns array and sub-bursts array, the prioritization scheme is to choose the planar array design.