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您的检索式：作者名="E.P.PETROV"
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| 1 | 失谐叶片轮盘的减缩建模及动力响应预测方法显示文摘为解决高保真失谐叶盘计算量大的问题,提出了一种新的减缩建模及动力响应预测方法。该方法对叶盘单扇区有限元模型进行圆周对称分析,获取谐调叶盘在局部坐标系下的基本模态特性。同时,运用主节点的概念,仅对少量节点进行模态分析,在大大降低矩阵维度的同时获取准确的失谐模态特性。在动力响应预测分析时,利用失谐固有频率点处响应的基本特性,仅选取危险频段内、危险叶片上的危险节点进行响应分析计算,既极大地提高了运算效率,又能够准确地获取叶盘最大受迫响应幅值。实例分析结果表明:相较于传统的有限元方法,该方法中模态分析的求逆过程矩阵维度从150万下降到384,计算所得的前50阶固有频率的精度保持在0.005%以内,最大响应计算过程运算量下降超过99%时,仅存在-0.35%的误差。 | 臧朝平 段勇亮 E.P.PETROV | 2015 | 航空学报2015，36，10： | 9 |
| 2 | 失谐叶盘受迫响应的灵敏度分析方法显示文摘针对失谐叶盘结构的受迫响应与叶片失谐之间的敏感性问题,提出了一种失谐叶盘最大响应幅值分别关于叶片频率失谐参数和叶片节点失谐质量的一阶和二阶灵敏度系数计算方法,以探究叶盘结构失谐参数对其最大响应幅值的影响。该方法立足于高保真失谐叶盘减缩建模和响应分析技术,直接对失谐叶盘结构的动力学方程进行推导获取其一阶和二阶灵敏度系数的数学表达式,未引入任何其他近似和简化计算措施,可以有效地求解高保真失谐叶盘最大响应幅值在不同激励频段、激励阶次和失谐形式下的灵敏度系数。该灵敏度分析方法在大规模高保真失谐叶盘结构模型上验证了其有效性。结果表明,与常规的数值差分灵敏度近似计算方法相比,本文提出的灵敏度分析方法在计算精度和计算效率方面具有巨大的优势,对进一步的失谐叶盘响应分析具有广泛的应用前景和通用性。 | 谭元球 臧朝平 周标 段勇亮 E.P.PETROV | 2017 | 航空学报2017，38，12： | 3 |
| 3 | Identification of crystal orientation for turbine blades with anisotropy materials显示文摘A novel approach to identify the crystal orientation of turbine blades with anisotropy materials is proposed. Based on enhanced mode basis, with the main advantages of its efficiency,accuracy and general applicability, the blade vibration mode of each order is linearly constructed by several specified mode shapes, which are obtained from the considered turbine blade with specified crystal orientations correspondingly. Then, a surrogate model based on Kriging method is introduced for constructing the condensed perturbed matrix of stiffness in order to improve the efficiency even further. The constructed surrogate model allows to perform the modal analysis of turbine blades with arbitrary crystal orientations in higher efficiency, due to the fact that the elements of condensed perturbed matrix of stiffness are considered in construction of the surrogate model rather than concerning the perturbation of all the elements of the initial stiffness matrix for the blade. Genetic algorithm is finally employed to optimize the defined fitness functions in order to identify the crystal orientation angles of turbine blades. Several corresponding examples demonstrated the accuracy, efficiency and general applicability of the proposed method. | Yuanqiu TAN Chaoping ZANG Biao ZHOU Xiaowei WANG E.P.PETROV | 2018 | Chinese Journal of Aeronautics2018，31，2： | 0 |
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