Aircraft Structural Stress Based Indicators For Loads Optimisation

航空结构设计过程中的基本阶段是载荷开发和应力/尺寸。前者处理飞机在服役中可能遇到的载荷情况的开发，而后者负责承载上述载荷所需的结构部件的详细设计。由于大量的负载情况（考虑到动态操作中的每个时间步可能有数百万），通常会实施资源密集型的下选择过程，以将情况数量减少到几百或几千。这个新项目的高级目标是开发一种方法，用于发现飞机动态机动如何反映在整个飞机结构的各个元素的所需性能上，并发现这些要求对设计变化的敏感性。完成此任务所需的任务是：-捕获负载设计中给定更改的分布式负载的更改。-制定一项策略，以确定最有效的结构应力指标，以提供成本函数，以推动给定负载设计机会的优化。-为更复杂的结构元件开发相应的实际结构性能包络，特别是那些需要bbbb3特征载荷的结构。理想情况下，这应该可扩展到20-40负载情况，以捕获完整的机翼/机身/ HTP行为。-开发和评估在大量复杂加载状态、设计变量和约束的背景下计算灵敏度的新方法，从而得出基于结构应力指标的优化负载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.