A Safety Factor Method for Reliability-Based Component Design
A Safety Factor Method for Reliability-Based Component Design
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DOI：
10.1115/1.4049881
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发表时间：
2021-09
影响因子：
3.3
通讯作者：
Jianhua Yin;Xiaoping Du
中科院分区：
文献类型：
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作者：
Jianhua Yin;Xiaoping Du
基于可靠性的设计（RBD）采用优化来确定满足可靠性要求的设计变量。然而，对于许多不需要优化的常规组件设计工作，RBD可能不适用，特别是对于那些手动执行或使用电子表格执行的设计工作。这项工作开发了一种改进的RBD方法的组件设计，使可靠性目标可以通过进行传统的组件设计重复使用一个确定性的安全系数。新构件的设计基于一阶可靠性方法（FORM），该方法在设计过程中迭代地分配安全系数，直到满足可靠性要求。除了确定性元件设计的几次迭代之外，其他额外的工作是计算设计裕度相对于随机输入变量的导数。所提出的方法可以用于广泛的组件设计应用。例如，如果确定性组件设计是手动执行或使用电子表格执行的，则基于可靠性的组件设计也是如此。通过三个算例验证了该方法的实用性。
Reliability-based design (RBD) employs optimization to identify design variables that satisfy the reliability requirement. For many routine component design jobs that do not need optimization, however, RBD may not be applicable, especially for those design jobs which are performed manually or with a spreadsheet. This work develops a modified RBD approach to component design so that the reliability target can be achieved by conducting traditional component design repeatedly using a deterministic safety factor. The new component design is based on the first-order reliability method (FORM), which iteratively assigns the safety factor during the design process until the reliability requirement is satisfied. In addition to several iterations of deterministic component design, the other additional work is the calculation of the derivatives of the design margin with respect to the random input variables. The proposed method can be used for a wide range of component design applications. For example, if a deterministic component design is performed manually or with a spreadsheet, so is the reliability-based component design. Three examples are used to demonstrate the practicality of the new design method.