Application of the modified infinite element method to two-dimensional transient acoustic radiation

By introducing the concept of modified sound pressure, Helmholtzʹ equation is converted into another form of differential equation. On this basis, an infinite element approach is proposed to solve transient acoustic radiation in unbounded domain by establishing a new type of shape function, which does not need a wave-like factor. Numerical tests indicate that this approach is free from “rule of thumb” mesh adjustments.