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Reliability-Based Design Optimization Method of Turbine Disk with Transformed Deterministic Constraints

机译：变换确定性约束的涡轮盘可靠性设计优化方法

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摘要

To improve the computational efficiency of the reliability-based design optimization (RBDO) of a complex structure with nonlinear and implicit limit-state function, the single-loop-single-vector (SLSV)-limit-state factor (LSF) (SLSV-LSF) method was developed by fully considering the advantages of the SLSV approach and the LSF method to transform uncertain constraints into deterministic constraints. The mathematical models of SLSV and LSF were established and the basic RBDO process of the SLSV-LSF method is presented. The shape optimization of an aeroengine turbine disk was completed based on the proposed method. From the reliability sensitivity analysis of the turbine disk, it is revealed that an uncertain constraint of average circumferential stress can be transformed into a deterministic constraint and material density can be regarded as a deterministic variable. Through the min-mass shape design of the turbine disk based on different approaches, it is demonstrated that the developed method maintains high computational speed and efficiency while keeping maintaining computational accuracy, which validates the feasibility and validity of the SLSV-LSF method in the RBDO of aeroengine typical components. (C) 2016 American Society of Civil Engineers.
机译：为了提高具有非线性和隐式极限状态函数的复杂结构基于可靠性的设计优化（RBDO）的计算效率，单回路单矢量（SLSV）极限状态因子（LSF）（SLSV- LSF）方法是通过充分考虑SLSV方法和LSF方法将不确定约束转换为确定性约束的优势而开发的。建立了SLSV和LSF的数学模型，并给出了SLSV-LSF方法的基本RBDO过程。基于该方法完成了航空发动机涡轮盘的形状优化。从涡轮盘的可靠性灵敏度分析中可以看出，可以将不确定的平均周向应力约束转换为确定性约束，而将材料密度视为确定性变量。通过基于不同方法的涡轮盘最小质量形状设计，证明了该方法在保持计算精度的同时保持了较高的计算速度和效率，验证了RBSV中SLSV-LSF方法的可行性和有效性。航空发动机的典型组件。 （C）2016年美国土木工程师学会。

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