Near-field sound radiation numeration in wave superposition method based on the spatially digital space

The traditional wave superposition method has the merit of higher computing velocity and higher calculation precision. But it relies solely on mesh geometry, and it cannot accommodate fast shape changes in the design stage of a consumer product or machinery, where much iteration of shape changes is required. And a new approach for representing geometry is introduced by constructing a uniform lattice in a 3-D digital work space. In the presented method, geometry is represented with boundary nodes or small lattice that can easily adapt to shape changes, and therefore it is more suitable for shape optimization. The new method is validated by computing sound radiation of simple structures, and the results show that the aforementioned method is entirely feasible, but also the calculation precision is relatively higher.