Aircraft Structural Stress Based Indicators For Loads Optimisation

航空航天结构设计过程中的基本阶段是载荷开发和应力/尺寸确定。第一部分涉及飞机在使用中可能遇到的可能载荷情况的发展，而第二部分负责承载上述载荷所需的结构部件的详细设计。由于大量的荷载工况（当考虑动态机动中的每个时间步长时，可能是数百万），通常实施资源密集型向下选择过程以将情况的数量减少到几百或几千。这个新项目的一个总体目标是，开发出一种方法，以便发现飞机的动态机动性是如何反映在整个飞机的各个部件所要求的性能上的结构，并发现这些要求对设计变更的敏感性。完成这一任务所需的任务是：-捕获负载设计中给定变化的分布式负载变化。- 制定一项战略，以确定最有效的结构应力指标，以提供成本函数，推动给定载荷设计机会的优化。为更复杂的结构元件，特别是那些需要大于3个特征载荷的元件，开发相应的实际结构性能包络线。理想情况下，这应该是可扩展到20-40个载荷工况，以获得完整的机翼/机身/ HTP特性。开发和评估在大量复杂载荷状态、设计变量和约束条件下计算灵敏度的新方法，从而根据基于结构应力的指标，得出优化载荷设计机会的推荐方法。

The fundamental stages within the aerospace structural design process are loads development and stressing/sizing. The first deals with the development of possible load cases that an aircraft may encounter in service, whereas the latter is responsible for the detailed design of the structural components required to carry the aforementioned loads. Due to the large number of load cases (potentially millions when each time step in the dynamic manoeuvres is considered) a resource intensive down-selection procedure is typically implemented to reduce the number of cases to a few hundred or thousand.The high-level aim of this new project is to develop a methodology for discovering how aircraft dynamic manoeuvres are reflected in the required performance on individual elements of the whole aircraft structure, and discover the sensitivity of those requirements to design changes. The tasks required to accomplish this are:- Capture the changes in distributed loading for a given change in loads design. - Develop a strategy for identifying the structural stressing indicators that are most effective for providing the cost function to drive the optimisation of the given loads design opportunity.- Develop the corresponding realistic structural performance envelopes for more complex structural elements, especially those requiring >3 characteristic loads. Ideally this should be scalable to the 20-40 load cases required to capture the complete wing / fuselage / HTP behaviour.- Develop and evaluate new methods for the computation of sensitivities in the context of large numbers of complex loading states, design variables and constraints, and thereby arrive at a recommended approach for optimising loads design opportunities based upon structural stress based indicators.