Analysis on vibration isolation of Zhongnan Theater

As one of the arenas of the Eighth China Art Festival,Zhongnan Theater is of stringent stipulation in the respect of acoustic environment.It was shown in the environmental evaluation report that structural noise in the theater induced by rail transit exceeded 30 dB(A),which didn’t satisfy the noise evaluation curve NR-25.The attenuation formula of environmental vibration in the field of Zhongnan Theater was derived by the linear regression method.Numerical simulation of environmental vibration around the projected field was carried out by Ansys three-dimensional FEM program,in which the exciting force was input from the vibration data measured at the foot of the pier.That the simulation results were consistent with the measured data indicated the reliability of the numerical model.According to the practice,three kinds of vibration isolation models were established.And it was indicated by the simulation results that the effect of combination of continual walls and vibration alleviation materials was satisfactory.