In this paper, it was presented that a simple method for calculating the distribution of the pistonlike sound fields, which extends the approach proposed by Wen and Breazeale. The distribution function on the source i...In this paper, it was presented that a simple method for calculating the distribution of the pistonlike sound fields, which extends the approach proposed by Wen and Breazeale. The distribution function on the source is expressed as the product of one function and a Gaussian sum of the step function, and the calculation of the sound fields reduces the estimation of sums of some relatively simple functions such as the M-shape and Gaussian ones. Some of pistonlike fields are evaluated, and the results indicate that this approach is very successful.展开更多
A sound pulse scattering from an edge of thick plates is experimentally and numerically investigated. Beside the edge diffracted signal, waves radiated by the plate that are excited from the plate edge are also detect...A sound pulse scattering from an edge of thick plates is experimentally and numerically investigated. Beside the edge diffracted signal, waves radiated by the plate that are excited from the plate edge are also detected in the diffraction process. The phenomena are examined by the elastic plate theory and agrecment is observed. The finite difference method (FDM) is used in the numerical calculation. Field distribution around the plate edge and fields at certain points as functions of time are displayed. Comparison is made with experiments. It is found that the grid size of FDM formulation may affect accuracy of computation significantly, but the results show the same phenomena as that measured in experiments.展开更多
文摘In this paper, it was presented that a simple method for calculating the distribution of the pistonlike sound fields, which extends the approach proposed by Wen and Breazeale. The distribution function on the source is expressed as the product of one function and a Gaussian sum of the step function, and the calculation of the sound fields reduces the estimation of sums of some relatively simple functions such as the M-shape and Gaussian ones. Some of pistonlike fields are evaluated, and the results indicate that this approach is very successful.
文摘A sound pulse scattering from an edge of thick plates is experimentally and numerically investigated. Beside the edge diffracted signal, waves radiated by the plate that are excited from the plate edge are also detected in the diffraction process. The phenomena are examined by the elastic plate theory and agrecment is observed. The finite difference method (FDM) is used in the numerical calculation. Field distribution around the plate edge and fields at certain points as functions of time are displayed. Comparison is made with experiments. It is found that the grid size of FDM formulation may affect accuracy of computation significantly, but the results show the same phenomena as that measured in experiments.
