叶片可靠性预测的非线性振荡低网格边界元法

为了预测叶轮机械叶片的流体激振可靠性，基于非线性流体激振理论，建立流体结构耦合分析的边界积分方程直接求解格式，采用等效均值和离差的线性化处理来估算可靠度指标，提出了叶片可靠性分析的非线性振荡低网格边界元法。数值计算结果显示，该方法能快速、有效地预测叶片结构的工作性能，可应用于新型叶轮机械的优化概率设计。

Nonlinear-oscillating Meshless Boundary Element Method for the Prediction of Blade Reliability

On the basis of a nonlinear fluid vibration excitation theory a direct solution scheme for boundary integral equations of fluid structure coupling analysis has been set up to predict the fluid excited vibration reliability of turbomachine blades. By using the linearization treatment of equivalent mean values and deviations a reliability index is evaluated, and a nonlinear meshless boundary element method proposed to analyze the reliability of blades. The results of numerical calculations indicate that the proposed method can be employed to realize a speedy and effective prediction of blade performance and to conduct an optimized probability design for a new type of turbomachinery.