Structural fatigue property of Shanghai 65-m fully-steerable antenna structure is analysed. According to the active fully-steerable working pattern, the typical fatigue stress piece is put forward based on simple sampling and decomposed by real-time rain flow counting algorithms. Subsequently, the fatigue lives of pitch mechanism bearings were computed by miner linear accumulative damage criterion. What’s more, in a complete cycle of dynamic observation, the shear force and axial force of high strength friction grip bolts for all of the supporting nodes are extracted and counted aiming at each pitching angle. As a result, fatigue analysis is carried out on the supporting nodes of the back-frame structure connected with the pitching mechanism. Last but not the least, finite element refinement model is conducted for the contact part between antenna wheels and the rail. Based on contact fatigue curve spectrum, the contact fatigue existing between the antenna structure roller and the track is analysed. The results show that the fatigue life of the whole antenna structure can meet the safety requirements in the design reference period which is intended to be 30 years. This systematic fatigue analysis procedure, method and results can provide valuable references for design, construction and maintenance of such similar fully-steerable antenna structures in future.

中文翻译：

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上海65米全转向天线结构正常运行时的旋转疲劳分析

分析了上海65米全转向天线结构的结构疲劳特性。根据主动全转向工作模式，基于简单采样提出典型疲劳应力片，并通过实时雨流计数算法进行分解。随后，采用矿工线性累积损伤准则计算变桨机构轴承的疲劳寿命。更重要的是，在一个完整的动态观察周期中，针对每个俯仰角，提取并计算所有支撑节点的高强度摩擦夹紧螺栓的剪切力和轴向力。因此，对与俯仰机构相连的靠背框架结构的支撑节点进行了疲劳分析。最后但是同样重要的，对天线轮与钢轨接触部分进行了有限元细化模型。基于接触疲劳曲线谱，分析了天线结构滚轮与轨道之间存在的接触疲劳。结果表明，整个天线结构的疲劳寿命在拟定为30年的设计参考期内能够满足安全要求。该系统的疲劳分析程序、方法和结果可为今后此类类似的完全可控天线结构的设计、施工和维护提供有价值的参考。结果表明，整个天线结构的疲劳寿命在拟定为30年的设计参考期内能够满足安全要求。该系统的疲劳分析程序、方法和结果可为今后此类类似的完全可控天线结构的设计、施工和维护提供有价值的参考。结果表明，整个天线结构的疲劳寿命在拟定为30年的设计参考期内能够满足安全要求。该系统的疲劳分析程序、方法和结果可为今后此类类似的完全可控天线结构的设计、施工和维护提供有价值的参考。