Research On Acoustic Vector Field Calculation And Analysis In Range-Dependent Environment

With the widely application of vector hydrophones, the acoustic vector field modeling is becoming a hot research issue worldwide. In the light of the fact that domestic methods of acoustic field modeling calculated sound pressure field only, this paper focus on the modeling of the irregular ocean acoustic vector field.Both digital waveguide network methods and parabolic equation methods are chosen to analyze the acoustic vector field in the dissertation. Firstly, based on basic theory, the sea water-liquid bottom boundary conditions and medium absorption coefficient are derived in detail. Then the two-dimensional horizontal and sloping liquid-bottom sound field model is established. Results show that there is little difference between the DWN and standard solution in calculating low frequency and near-field sound vector field. Thus we proved that the DWN is acceptable. After that, based on PE methods theory, expressions of acoustic vector field have been derived, as well as the sloping liquid-bottom and the three-dimensional acoustic field model is built. The simulated results of the low frequency and far-field sound field are exactly the same as standard solution.Finally, an acoustic vector field calculation software is developed on base of two algorithms described above with VC++ 6.0. It is convenient to calculate acoustic field with the help of this software. Test results show that the software is advanced in both calculation speed and accuracy. It is able to model both acoustic pressure and acoustic vector field of various environments. Furthermore, Images of acoustic pressure transmission loss, particle velocity, acoustic energy flow and temporal waveform under different circumstances are available with the help of this software.