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首页> 外文期刊>Mechanics & Industry >SICODYN international benchmark on dynamic analysis of structure assemblies: variability and numerical-experimental correlation on an industrial pump (part 2)
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SICODYN international benchmark on dynamic analysis of structure assemblies: variability and numerical-experimental correlation on an industrial pump (part 2)

机译：SICODYN结构组件动态分析的国际基准：工业泵的可变性和数值实验相关性（第2部分）

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摘要

An international benchmark has been organized by EDF R&D during 2008-2010, gathering 11 partners. Its main objective is to quantify the confidence in numerical models. The built-up dynamical system considered is a pump actually in service in power plants, considered in its work environment. Blind eigenfrequency numerical values relative to the pump assembly fixed in concrete present a larger variability than the 5% rough variability concerning the separate parts, essentially due to the modeling of the boundary conditions and interfaces at macro level. For the nine first eigenmodes considered, experimental-numerical correlation shows a frequency error less than 15% for the free sub-structures and nearly 30% for the free five-component system. Though the first overall modes are correctly identified, the frequency error is significantly larger for the clamped pump assembly, with however MAC coefficients higher than 0.9 for two modes; but the frequency error can be reduced to less than 9% for the four first modes after updating procedure. A lesson to draw is that measurement information is needed to improve the quality of theoretical built-up structure. After this benchmark, a more ambitious research program will follow as a FUI project, gathering the observation of numerical and experimental variabilities, updating model improvement and numerical quantification of the total uncertainty.
机译：EDF研发部门在2008年至2010年间组织了一项国际基准，吸引了11个合作伙伴。其主要目的是量化数值模型的置信度。所考虑的组合动力系统是实际在发电厂使用的泵，在其工作环境中考虑。相对于固定在混凝土中的泵组件，本征频率数值的可变性要比单独零件的5％粗糙可变性大，这主要是由于在宏观层面对边界条件和界面进行了建模。对于所考虑的九个第一本征模，实验-数值相关性显示出自由子结构的频率误差小于15％，自由五分量系统的频率误差小于30％。尽管可以正确识别出第一个整体模式，但是对于夹紧泵组件，频率误差明显更大，但是对于两种模式，MAC系数都高于0.9。但更新程序后，前四个模式的频率误差可以降低到小于9％。可以吸取的教训是，需要测量信息来提高理论结构的质量。在达到此基准之后，将进行更雄心勃勃的研究计划，作为FUI项目，收集对数值和实验变异性的观察，更新模型改进和总不确定性的数值量化。

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