Surface Tolerances for Aircraft Design, Maintenance and Repair

飞机设计、维护和修理的表面公差

• 批准号: 102373
• 金额: $ 60.25万
• 依托单位: IHS GLOBAL LIMITED
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=102373
• 关键词: Surface; Tolerances; Aircraft; Design; Maintenance

The aerodynamic design of aircraft surfaces is subject to many constraints and is refined interactively during the design cycle. One of the constraints is the manufacturing tolerance at joints, surface roughness/waviness and gaps. During the design phase acceptable tolerances are set by the aerodynamic department to minimize their effect on performance and fuel burn. The current methods only estimate the excrescence drag and are based on the interpretation of results from surface discountinities placed in a zero pressure gradient. Therefore these methods do not consider effects on lift and pitching moment. This project will develop and validate rapid CFD-based tools that capture these effects over a wide range of surface shapes and flow conditions, and consequently more accurate data sheet methods. These methods will enable the designer to trade surface-finish requirements between performance benefits and manufacturing costs and thus reduce total-ownership costs. In addition the results from this project will be tailored to provide information to operators to assist in their maintainance in order to minimise the increase in fuel burn due to ageing aircraft.

飞机表面的气动设计受多种约束条件的制约，在设计过程中需要进行交互优化。约束之一是连接处的制造公差、表面粗糙度/波纹度和间隙。在设计阶段，空气动力学部门设定可接受的公差，以最大限度地减少对性能和燃料消耗的影响。目前的方法只估计额外阻力，并且基于对放置在零压力梯度中的表面折射率的结果的解释。因此，这些方法没有考虑升力和俯仰力矩的影响。该项目将开发和验证基于CFD的快速工具，这些工具可以在广泛的表面形状和流动条件下捕捉这些影响，从而获得更准确的数据表方法。这些方法将使设计者能够在性能优势和制造成本之间权衡表面光洁度要求，从而降低总拥有成本。此外，该项目的结果将被调整，以便向运营商提供信息，以帮助他们进行维护，以最大限度地减少因飞机老化而增加的燃料消耗。