openmdao¶
pyNA is developed in the openMDAO framework. On this page, you’ll learn what you need to know about openMDAO to be able to interact with pyNA.
creating an openMDAO problem¶
When calling pyna.create_problem(), an openMDAO problem, called pyna.prob is created with the NoiseModel group. The NoiseModel group hosts the components that are used to compute noise of the trajectory.
The Geometry component
The Source component
The Propagation component
The Levels component
A recorder can be added to an openMDAO to save variables in the model after a run. More information about openMDAO recorders can be found here. To enable the recording of the results, set settings["save_results"] = True. The output file can be named using settings["output_file_name"]. This file will be saved in the output folder of the settings["case_directory"] directory.
The command prob.setup() sets up the model without running it. It connects all the inputs and outputs of all the components.
The command prob.run_model() runs the openMDAO problem.
N2 diagram¶
A handy feature of an openMDAO problem is the input-output or N2 diagram. The structure of the openMDAO problem is nicely illustrated using such a diagram. An example can be seen in the pyna structure page.
accessing variables¶
To access the variables, you can use the command prob.get_val("..."), where ... is the name of the variable. You can use the N2 diagram to see the promoted name of the variables inside pyNA.
For example: the sound-pressure level (SPL) can be accessed by calling prob.get_val('levels.SPL').
