In view of the offshore wind turbine vibration control problems,a kind of locally resonant phononic crystal tower structure is put forward.Based on the Bloch theorem of periodic structure,the finite element method is used to calculate the band structure,displacement fields of eigenmodes and transmission power curves of the finite period phononic crystal tower structure,its band gap characteristics are analyzed.Based on the formation of locally resonant band gap,the vibration control problems of the phononic crystal tower structure is studied,which can be applied to the vibration reduction of offshore wind turbines at specific frequencies in different marine environments.The transmission power curves of the phononic crystal tower structure in the xy plane and the z direction are obtained,and the structural displacement diagrams at specific frequencies are selected for analyzing.The transmission power curves of non-ideal phononic crystal tower structure in the xy plane and the z direction are calculated and compared.The influence of various parameters on the band gap attenuation band of the phononic crystal tower structure is studied.By adjusting reasonable design parameters,low frequency vibration isolation in a specific range of the structure can be realized,which has a good application prospect in the field of vibration reduction of offshore wind turbines in complex marine environment.
关键词
振动与波/声子晶体/海上风机/减振特性/带隙特性/能带结构
Key words
vibration and wave/phononic crystal/offshore wind turbine/vibration reduction characteristics/band gap characteristics/band structure
维普
万方数据