The integral Helmholtz equation is derived with the acoustic radiation of railway bridges taken into acount and by using the transfer matrix method for railway bridge and the boundary el...The integral Helmholtz equation is derived with the acoustic radiation of railway bridges taken into acount and by using the transfer matrix method for railway bridge and the boundary element method for the infinite sonic field. Then, the noises generated by a high speed train passing over a bridge are analytically studied. It is shown that high speed railway noises are of wide frequency, and that reducing vibration does not necessary lowering noises unless the most significant noises at special frequencies are decreased.展开更多
文摘The integral Helmholtz equation is derived with the acoustic radiation of railway bridges taken into acount and by using the transfer matrix method for railway bridge and the boundary element method for the infinite sonic field. Then, the noises generated by a high speed train passing over a bridge are analytically studied. It is shown that high speed railway noises are of wide frequency, and that reducing vibration does not necessary lowering noises unless the most significant noises at special frequencies are decreased.
