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翼肋主要作用是维持机翼外形,对于机翼的总弯曲刚度贡献较小,但是翼肋的重量却在翼盒的结构重量中占有相当大的比例(一般为8%～12%),因此有必要通过一定的结构优化方法减轻翼肋的结构重量。在MSC.PATRAN平台上二次开发了应力约束全局化的拓扑优化方法,并首次将该方法应用于翼肋的拓扑优化;采用了一套工程估算方法,可用于翼肋的初步设计和快速重量估算。结果表明:在满足稳定性要求的情况下,经过拓扑优化的翼肋结构减重效果明显。
The main function of the ribs is to maintain the profile of the wing and contribute less to the overall bending stiffness of the wing. However, the weight of the ribs accounts for a significant proportion (typically 8% to 12%) of the structural weight of the wing box It is necessary to reduce the structural weight of the rib by some structural optimization methods. In the MSC.PATRAN platform, the topological optimization method of stress-constrained globalization is developed for the second time, and the method is applied to the topological optimization of the rib for the first time. A set of engineering estimation method is adopted, which can be used for preliminary design of the rib and rapid weight Estimated. The results show that under the condition of meeting the stability requirements, the topological optimization of the rib structure significantly reduces the weight loss.