Location

Virtual

Start Date

5-10-2021 11:10 AM

End Date

5-10-2021 11:20 AM

Description

In this paper a new mode tracking method is presented which incorporates backtracking logic to maintain a high degree of confidence in mode tracking results. The effectiveness of this mode tracking method is demonstrated on linear and nonlinear aeroelastic systems of varying complexity in the context of aeroelastic analyses and optimizations with stability constraints. The high degree of confidence in mode correlations provided by the new mode tracking method allows for the creation and use of mode-specific C1 continuous stability constraints in gradient-based optimization frameworks. Using our mode tracking method in the context of a gradient-based optimization framework with nonlinear flutter constraints eliminates the need to use constraint aggregation to construct C1 continuous flutter constraints, allows mode shapes to be prescribed, and enables less critical modes in coupled aeroelastic and flight stability analyses to be ignored when constructing nonlinear flutter constraints.

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May 10th, 11:10 AM May 10th, 11:20 AM

Reliable Mode Tracking in Gradient-Based Optimization Frameworks with Flutter Constraints

Virtual

In this paper a new mode tracking method is presented which incorporates backtracking logic to maintain a high degree of confidence in mode tracking results. The effectiveness of this mode tracking method is demonstrated on linear and nonlinear aeroelastic systems of varying complexity in the context of aeroelastic analyses and optimizations with stability constraints. The high degree of confidence in mode correlations provided by the new mode tracking method allows for the creation and use of mode-specific C1 continuous stability constraints in gradient-based optimization frameworks. Using our mode tracking method in the context of a gradient-based optimization framework with nonlinear flutter constraints eliminates the need to use constraint aggregation to construct C1 continuous flutter constraints, allows mode shapes to be prescribed, and enables less critical modes in coupled aeroelastic and flight stability analyses to be ignored when constructing nonlinear flutter constraints.