中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
PE算法的改进

文献类型:学位论文

作者石达景
学位类别博士
答辩日期1992
授予单位中国科学院声学研究所
授予地点中国科学院声学研究所
关键词水下声场 数值预报 PE算法
其他题名Improvement of PE (Parabolic Equation) Approximation Method
中文摘要PE 算法是水下声场数值预报的有效方法,本文利用恰当分离局地简正波,并分别进行PE运算的方法,使相位误差减小,精度提高。通常,只需把简正波分为两组,就可使相位误差平均降低十几倍。所以,此算法使PE近似法适用的频率、距离、传播角度范围都有了很大的扩展,使对声场的预报也更准确。为了验证程序的准确性和有效性,本文给出了改进PE算法的部分数值模拟结果,并把它们同PE算法的结果、MOATL程序的结果以及理论值进行了比较。可见改进后PE程序在一定程度上还是可行的。
英文摘要The parabolic equation (PE) method is one of the effective approcimations for numerically forecasting the underwater acoustic field. The improved PE model proposed in this paper, after properly seperating the local normal-modes, respectively using PE method, can improve the precision of the calculatable sound field and decrease its phase error. Normally, only two separate groups of normal-modes are needed in order to reduce the phase error more than 10 times. It shows the improved PE method greatly extends the limits of suitable frequency, rang and propagation angle for PE approach so that the acoutic field prediction will be more exact. In order to testify the accuracy and efficiency of the computer program of the improved PE method, PE, MOATL approachs are respectively applied. The comparision of their data with each other and with the theoretical data shows the imptoved PE method at some extent is still available in sound field prediction.
语种中文
公开日期2011-05-07
页码21
源URL[http://159.226.59.140/handle/311008/1214]  
专题声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文
推荐引用方式
GB/T 7714
石达景. PE算法的改进[D]. 中国科学院声学研究所. 中国科学院声学研究所. 1992.

入库方式: OAI收割

来源:声学研究所

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