Noise Optimization

[Nicolas...@gmx.de]

Hello, I doing a Noise Optimization Study for a medium range aircraft and based on the script I got some questions you can hopefully help me with:

- the reference speed (approach, sideline, flyover)is not changing when I change it the the mission segments. I could change it about the optimization file, with the problem inputs: V2 and VLS speed increase, and also for the cutback altitude, but I would like to know how the process works within the aerodynamics?

- kind of the same questions, but about the flaps and slats: how can I be sure there is the right deflection for the mission segment?

- I got problems to integrate the plots into the optimization file and does the noise contour plot works? for another file I couldn't get the plots for the noise contour

- I would like to change the origin of the engines: in the B737 Vehicle is a hint that the center of gravity is overwritten in the compute_component_centers_of_gravity(base, compute_propulsor_origin=True) but I couldn't find it. And when I change the origin there is no change for the noise. 

- not sure how the optimization/nexus works or how do I see the optimization values within the lb and ub values and the generate new truth data?

[Emilio]

Hi,

The reference speeds are calculated and not inputs. See here.

Flaps and slat settings are done at the configuration level.

I believe, the noise contour plots were not made to work with that level of Fidelity Noise analysis. The optimization code was supposed to be a quick analysis and not a definitive one. This tutorial uses the F1 noise models and make the plots. You may need to do some splicing to use them for a B737.

The origin location of the engine should change with the compute function, what changes is the relative CG. So relative to the engine origin, where is the CG. I also wouldn't expect a change in aircraft noise from changing the engine location. At this level of analysis we're calculating first order effects and not things like blade noise reflections off the fuselage etc.

You can set the LB and UB values like this. When it's done you can print out the results with bounds like this in the tutorials.

-Emilio