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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Convergent Zone-Refinement Method for Risk Assessment of Gas Turbine Disks Subject to Low-Frequency Metallurgical Defects
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Convergent Zone-Refinement Method for Risk Assessment of Gas Turbine Disks Subject to Low-Frequency Metallurgical Defects

机译：低频冶金缺陷的燃气轮机圆盘风险评估的收敛区域精化方法

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摘要

Titanium gas turbine disks are subject to a rare but not insignificant probability of fracture due to metallurgical defects, particularly hard a, A probabilistic methodology has been developed and implemented in concordance with the Federal Aviation Administration (FAA) Advisory Circular 33.14-1 to compute the probability of fracture of gas turbine titanium disks subject to low-frequency metallurgical (hard a) defects. This methodology is further developed here to ensure that a robust, converged, accurate calculation of the probability is computed that is independent of discretization issues. A zone-based material discretization methodology is implemented, then refined locally through further discretization using risk contribution factors as a metric. The technical approach is akin to "h" refinement in finite element analysis; that is, a local metric is used to indicate regions requiring further refinement, and subsequent refinement yields a more accurate solution. Supporting technology improvements are also discussed, including localized finite element refinement and onion skinning for zone subdivision resolution, and a restart database and parallel processing for computational efficiency. A numerical example is presented for demonstration.
机译：钛燃气轮机盘由于冶金缺陷而遭受断裂的可能性很小，但并非微不足道，特别是困难的a。已根据联邦航空局（FAA）咨询通告33.14-1制定并实施了一种概率方法，以计算燃气轮机钛合金盘遭受低频冶金（硬a）缺陷损坏的可能性。在此进一步开发此方法，以确保计算出与离散化问题无关的可靠，收敛，准确的概率计算。实施基于区域的材料离散化方法，然后使用风险贡献因子作为度量标准，通过进一步离散化对局部进行细化。该技术方法类似于有限元分析中的“ h”细化。即，使用局部度量来指示需要进一步细化的区域，并且随后的细化产生更精确的解决方案。还讨论了支持技术的改进，包括用于区域细分解决方案的局部有限元优化和洋​​葱皮化处理，以及重新启动数据库和并行处理以提高计算效率。给出了一个数值示例进行演示。

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