Semi-analytical and semi-numerical method for calculating the vibration characteristics of structure excited by turbulent boundary layer
A semi-analytical and semi-numerical method for calculating the vibration characteristic of structure excited by turbulent boundary layer based on random excitation theory is presented.The power spectra density expression of the excitation caused by turbulent boundary layer given by Corcos is dispersed into matrix form as input.Combined with the frequency response function matrix considering fluid-structure interaction calculated by FEM/BEM methods,the power spectral density of the structure velocity is calculated.The numeric method result is quite identical with the analytical method mentioned in references,proving the numeric one to be correct.Thus,this method is used to calculate the vibro-acoustic characteristic of single cylindrical shells excited by turbulent boundary layer.The result shows that this semi-analytical and semi-numerical method is quite suitable for solving practical engineer projects the structure of which has a simple and regular outer shape but has quite complicated inner structures such as machinery,pipe system and so on.