Iacopo Totaro

Hello!

I need help to make a cascade control in WEST. The control of aeration is performed using ammonium and DO sensors. Ammonium is set between 1.5-3 mg N-NH4/l. Ammonium concentration of 3 mg/l coincides with 1.5 mg/l of DO and ammonium concentration of 1.5 mg/l coincides with 0 mg/l of DO. So the air flow is regulated accordingly. In the model instead of using the air flow I would use directly the Kla to the tanks. I try to use two OnOffBand controlled linked together, with the second one which receives information from DO sensor and the first controller, but it doesn't work. Somebody can explane step by step how I can do?

Thanks a lot for your attention and your time.

Iacopo Totaro

[quote author=Youri Amerlinck link=topic=1471.msg3644#msg3644 date=1371214035]
[quote]I would say it is. LSA aggregates the differences between the reference time series and the perturbed time series (backward and forward), at the selected time points, into a number of values (MAE - Mean Absolute Error, MRE - Mean Relative Error, RMSE - Root Mean Squared Error, ...) that are presented in a table at the end the LSA experiment's execution (Analysis/Runs). This table can be used for ranking. [/quote]

[/quote]

From what types of values in the table would you start to make a ranking of sensitivity by?

[quote author=Enrico Remigi link=topic=1478.msg3635#msg3635 date=1371051301]
You need to modify the value(s) at the level of the model, using the Model Editor
[/quote]

I tried to use Model Editor, but I didn't find where I can do the modify. Can you explain better?

Thank you very much.

Enrico Remigi what do you mean for "Tornado plots"? Because in GSA I only have done plots which are explaned in the GettingStarted Tutorial.

Hello!

I would like to know how you can change the standard range of variation of the parameters in the model, since a kinetic constant which I have to calibrate in the model ASM1 AN (K_NO3_H), has an upper limit too small.

Someone know how I can do?

Thank you for your attention and your help

Iacopo Totaro

I read your answers and I thank you, but then I would understand the main differences in WEST between local and global sensitivity analysis.

Hello!

I'm using Local Sensitivity Analysis in order to observe which parameter of the model is more sensitive. I’m using the model ASM1 AN in order to observe the nitrite profile in alternating cycles of nitrification and denitrification using intermittent aeration in the same process tank.

I would like to make some plots with the perturbation of the parameter on x-axis and the function of sensitivity on y-axis.

I would like also to plot the perturbed trajectories and the nominal trajectory for each parameter.

Then I would also like to define a ranking of sensitivity by the various parameters, so I can choose which ones I must calibrate.
Someone know how can I act?

Thank you for your attention and your help
Iacopo Totaro