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根据药柱不确定参量的特点和基于区间分析的非概率可靠性方法,提出了基于均匀设计思想的药柱结构非概率可靠性分析的响应面法。同时,针对二次多项式响应面函数对边界点附近拟合效果相对较差的问题,提出适当扩大原变量区间进行抽样计算的措施。算例表明,该方法在保证计算精度前提下所需的抽样次数较少,且无需迭代,大大降低了药柱非概率可靠性分析的复杂程度,为试验数据较少情况下药柱结构可靠性评估提供了一种有效的分析方法。
According to the characteristics of the uncertain parameters of the grain and the non-probabilistic reliability method based on the interval analysis, a response surface method based on the uniform design idea is proposed to analyze the non-probabilistic reliability of the grain structure. At the same time, aiming at the problem that the fitting effect of the quadratic polynomial response surface function to the vicinity of the boundary point is relatively poor, this paper puts forward some measures to expand the original variable interval appropriately for sampling calculation. The example shows that the proposed method requires less sampling times without iteration and greatly reduces the complexity of the non-probabilistic reliability analysis of the pillars. The reliability evaluation of the pillars is less when the experimental data is less Provides an effective method of analysis.