海洋平台周期桁架结构振动特性研究

Study on Vibration Characteristics of Periodic Truss Structures of Offshore Platforms

海洋平台长期处于洋流、台风及地震等恶劣环境中,其减振性能影响到设备运行和人员安全。基于周期导管结构的带隙特性,将海洋平台设计成全周期桁架结构。建立周期桁架结构的有限元分析模型,进行海洋平台周期桁架结构的响应计算,对比了传统桁架结构与周期桁架结构的响应特性,研究周期桁架的几何结构参数对海洋平台结构减振性能的影响规律。结果表明:海洋平台周期桁架结构的减振性能比传统桁架结构的减振性能提高了4.5 dB,带隙范围内的振动得到了显著降低。因此,在减振设计领域,周期结构在海洋平台桁架结构中具有很好的应用前景。

The offshore platform is always exposed to harsh environments such as ocean currents,typhoons and earthquakes,and its vibration reduction performance effect is always affecting the operation of equipment and the safety of people.In this paper,based on the band gap characteristics of the periodic conduit structure,the offshore platform was designed as a full periodic truss structure.Its finite element model was established,and the response calculation was performed.The response characteristics of the traditional truss structure and the periodic truss structure were compared mutually.The influence of the geometric structure parameters of the periodic truss on the vibration damping performance of the offshore platform structure was studied.The results show that the vibration damping performance of the periodic truss structure of the offshore platform is increased by 4.5 dB compared with the traditional truss structure,and the vibration in the band gap is significantly reduced.Therefore,periodic structures have a good application prospect in the field of vibration reduction design of offshore platform truss structures.