NUMERICAL SOLUTION COMPARED WITH EXPERIMENTAL RESULT FOR SOUND PROPAGATION IN DUCTS

Computational criteria used to judge the correctness of numerical calculation for sound propagation in ducts,are presented in the paper.An improved finite-difference scheme is proposed to compute problems with the discontinuity of the wall impedance.Moreover,the comparison of curves of numerical solution with experimental results for sound propagation in hard-soft-hard wall ducts and other examples are also presented.It is shown that both the criteria and the approach to discontinuity are successful and the computational model is rational.