| Citation: | Luo Feng, Deng Wangqun, Mi Dong, et al. NURBS-based optimization for bolt hole geometry design[J]. Journal of Aerospace Power, 2026, 41（X）：20250556 doi: 10.13224/j.cnki.jasp.20250556
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A bolt hole design optimization method based on Non-Uniform Rational B-Splines (NURBS) curves was proposed. The three-dimensional model of the bolt hole was constructed using a two-segment NURBS curve with pole-based control, with the optimization objective of minimizing the maximum equivalent stress. The pole coordinates served as design variables, while constraints included the maximum radial displacement of the baffle, maximum circumferential stress of the bolt hole, and bolt clamping area. A mathematical optimization model for the bolt hole was established, and the enhanced learning differential evolution (QLDE) algorithm was employed for optimization. The results showed that the optimized bolt hole achieved a 19.0% reduction in maximum equivalent stress, a 12.7% decrease in maximum circumferential stress, a 0.3% reduction in maximum radial displacement of the baffle, and a 0.5% increase in bolt clamping area, while the low-cycle fatigue life of the baffle improved by 122%. Experimental validation confirmed the effectiveness of the proposed method, with significantly enhanced low-cycle fatigue life. This addressed the failure issue of premature crack initiation in baffle bolt holes due to inadequate low-cycle fatigue life.
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