Permanent deformation estimates of dynamic equipment foundations: Application to a gas turbine in granular soils
Permanent deformation estimates of dynamic equipment foundations: Application to a gas turbine in granular soils
复制标题
动态设备基础的永久变形估计：在粒状土壤中燃气轮机的应用
DOI：
10.1016/j.soildyn.2014.03.002
复制
发表时间：
2014
影响因子：
4
通讯作者：
R. Jimenez
中科院分区：
文献类型：
--
作者：
R. Galindo;Manuel Illueca;R. Jimenez
研究了一台燃气轮机在细粒、级配差、密度中等的砂土上的永久位移。振型和振型的计算采用Barkan的S公式，并采用“高循环累积”(Hca)模型来考虑由于循环次数多而产生的累积变形。该方法很简单：它可以很容易地整合到标准的数学软件中，并且可以根据粒度测量和指数特性来估计HCA模型参数。特别关注设备S启动时的“暂态”情况，在此过程中遍历了一系列频率--包括可能与地面固有频率相似的频率。结果表明，这种暂态情况可能比与正常运行相对应的静态情况更具限制性。因此，仅对静止状态进行校核可能是不够的，需要研究暂态状态对计算永久位移的影响，以产生适当的基础设计。
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.