Nonlinear Ground Vibration Testing using Control-based Continuation

英国在机翼和喷气发动机等高价值航空结构的设计、制造和支持方面处于世界领先地位。英国的技术战略是到2035年将航空结构的重量比2019年减少35%。较轻的结构容易出现复杂的非线性现象，而目前的地面振动测试(GVT)无法识别和表征这些现象。在基于控制的延拓和非线性模态分析的最新进展的基础上，该项目将开发一种能够克服这一问题的通用和系统的GVT方法。由于与ONERA的国际合作，该方法将在两个学术基准结构上进行演示，然后在全尺寸飞机结构上进行测试。该项目不仅将揭开非线性结构模态特性的严格表征，而且还将弥合目前阻碍非线性模型开发和验证的差距。

The UK is a world leader in the design, manufacture, and support of high-value aeronautic structures such as wings and jet engines. The UK's technology strategy is to reduce aeronautic structure weight by 35% by 2035 compared to 2019. Lighter structures are prone to complex nonlinear phenomena which cannot be identified and characterised using current ground vibration tests (GVTs). Building on recent advances in control-based continuation and nonlinear modal analysis, this project will develop a general and systematic GVT method that can overcome this issue. The method will be demonstrated on two academic benchmark structures before being tested on a full-scale aircraft structure thanks to an international collaboration with ONERA. The project will not only unlock the rigorous characterization of modal properties of nonlinear structures but will also bridge the gap currently preventing the development and validation of nonlinear models.