海洋平台桁架结构半主动颗粒阻尼减振技术研究

摘要

海洋平台桁架结构的减振装置长期暴露在盐雾和高强度的紫外线辐射下,传统的黏弹性阻尼减振技术易老化、失效,其使用寿命有限.通过电磁场控制颗粒运动的半主动颗粒阻尼技术在被动颗粒阻尼技术耐高温、抗老化等优点的同时,还能适应外界复杂载荷的变化.基于耦合仿真分析方法研究半主动颗粒阻尼技术在海洋平台桁架结构中的减振性能,分析了控制策略、控制电流、颗粒参数等因素对海洋平台桁架结构振动特性的影响规律.结果表明:半主动颗粒阻尼减振效果优于被动颗粒阻尼减振效果;控制策略在不同频段对系统减振效果的不同;仿真结果与试验结果具有很好的一致性.%The traditional viscoelastic damping will be failure when the truss structure of an offshore platform is exposed to high-energy ultraviolet light and salt spray for along period of time.To solve the problem,the application of semi-active particle damping was studied in vibration reduction of the truss structure of an offshore platform.A coupling simulation algorithm based on the discrete element method and the finite element method was used to calculate the semiactive particle damper in the truss structure of the offshore platform.The influence of control strategy,control current and particle parameters on the vibration characteristics of the truss structure of the offshore platform was analyzed.The results show that the damping effect of semi-active particle damper is better than that of passive particle damper,and reasonable correlation is demonstrated between simulation and test.