基于NESSUS的某拔销器可靠性设计与优化

为提高拔销器的设计可靠性,基于应力-强度干涉理论,采用用于系统概率化分析的模块化计算软件NESSUS对其进行可靠性分析,得出该产品的设计可靠度值,并对影响其可靠度的随机变量进行敏感性和重要度分析。结果表明,该产品的设计可靠度值为0.99999999986,与试验值的相对误差为1.3E-10,在工程允许范围内。其中对可靠度影响较大的参数且按其影响程度大小进行排序依次为剪切销直径、输出压力的作用面积、起爆器输出装药的火药力和输出装药的密度,在材料选择及产品加工时,应保证这些参数的一致性。

Reliability Design and Optimization of a Retracting Actuator Based on NESSUS

In order to improve the design reliability of a retracting actuator, the reliability was analyzed and obtained by NESSUS (Numerical Evaluation of Stochastic Structures Under Stress) software based on the stress-strength interference theory, and the sensitivity and importance analysis on random variables which affect the design reliability were also done. Results show that the design reliability of the acuator is 0.99999999986, and the relative error between the test value is 1.3E-10, which is acceptable in engineering. The parameters that have relatively greater effect on the reliability orderes in degree as following diameter of shear pin, active area of output pressure, gunpowder impetus and density of detonator output charge. The consistency of these parameters should be guaranteed in material selection and product processing.