An experiment on vibration and sound radiation from finite stiffened double cylindrical shell covered with the uncoupled anechoic material is done

and the values of structure response of the shell’s surface and sound pressure are measured.The sound pressure of near-filed in four different work conditions is compared and the vibration passing of inner and outer shell under single-frequency excitation work condition is analyzed.The result shows that brace makes larger function on vibration passing between inner and outer shell

and the vibration and sound radiation can be rejected effectively when all the shell surfaces are coated with the uncoupled anechoic material.