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Permanent deformation estimates of dynamic equipment foundations: Application to a gas turbine in granular soils

机译:动态设备基础的永久变形估计:在颗粒土壤中的燃气轮机中的应用

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摘要

Permanent displacements of a gas turbine founded on a fine, poorly graded, and medium density sand are studied. The amplitudes and modes of vibration are computed using Barkan´s formulation, and the “High-Cycle Accumulation” (HCA) model is employed to account for accumulated deformations due to the high number of cycles. The methodology is simple: it can be easily incorporated into standard mathematical software, and HCA model parameters can be estimated based on granulometry and index properties. Special attention is devoted to ‘transient’ situations at equipment´s start-up, during which a range of frequencies – including frequencies that could be similar to the natural frequencies of the ground – is traversed. Results show that such transient situations could be more restrictive than stationary situations corresponding to normal operation. Therefore, checking the stationary situation only might not be enough, and studying the influence of transient situations on computed permanent displacements is needed to produce a proper foundation design
机译:研究了基于细砂,低级砂和中密度砂的燃气轮机的永久位移。使用Barkan的公式计算振动的振幅和模式,并使用“高循环累积”(HCA)模型来说明由于循环次数高而引起的累积变形。该方法很简单:可以轻松地将其合并到标准数学软件中,并且可以基于粒度分析法和指数属性估算HCA模型参数。在设备启动时会特别注意“瞬态”情况,在此情况下会遍历一系列频率,包括可能与地面自然频率相似的频率。结果表明,这种瞬态情况比对应于正常操作的静止情况更具限制性。因此,仅检查静态情况可能还不够,并且需要研究瞬态情况对计算得出的永久位移的影响才能产生适当的基础设计

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