Kooperation mit der Uni Teheran
Zu Beginn des Semesters kam der Gedanke auf, Bahmans Kontakte in den Iran zu einer studentischen Kooperation auf Projektbasis zu nutzen. Nach einigem hin und her erfolgete dann ein direkter Kontakt zu einem Professor der Uni, der auch kleinere Projekte bereut. Eine Gruppe von 4 Studenten erhielt dann von uns ein Pflichtenheft, welches die Anforderungen an das Teilprojekt enthielt.
Das Teilprojekt der Uni Teheran
Zum Test unserer Gesamtschaltung fehlte uns fast immer eine geeignete Spannungsquelle, die die 16 Brennstoffzellenspannungen simulieren konnte. Daher schlugen wir den iranischen Studenten vor, eine Dummy-Schaltung zu entwerfen, die sich annähernd wie unser Brennstoffzellenstack verhalten würden. Dabei wurden von uns folgende Anforderungen gestellt (Auszug aus einer Mail an die 4 Studenten...):
The Dummy-Fuelcell :
This should be an analog and/or digital device ( maybe based on a microcontroller …? ), to simulate a 16-pieces fuelcell-stack. This means the device provides 16 independent outputs with a voltage of 0…1 V. Every output has its own two potentials, so no common ground ! But it should be possible to cable the outputs externally in series, just as a fuelcell-stack. So, every output should behave like a battery/fuelcell. Also the outputs should be able to load up to 2A current.
Then, there should be some modes, to test the monitor-device :
Normal mode : every output is behaving like a working fuelcell, this means the voltage is 0.1 … 1 V and the voltage difference between output 1 and output 16 is not more than 0.1 V.
There should be different normal modes, like :
- all outputs on the same level ( maybe 0.7 V )
- the 16 outputs form shapes, like sine, cosine, step-function, random …
- Malfunction1-testmode : One of the 16 outputs ( can be chosen by the user ) goes in a fixed amount of time ( maybe adjustable ) below 0.1 V, the other outputs behave like in normal mode.
- Malfunction2-testmode : All outputs behave like in normal mode, but the voltage difference between output 1 and 16 increases over 0.1 V in a fixed time.
So, once again : Your task is to develop and build this dummy-fuelcell. When it is finished, you should send us all the necessary design information to rebuild one dummy in Berlin, so that we can use it with the fuelcell-monitor.
The work on the fuelcell-monitor is close at end, so you should know, that your students will work on the dummy-project, while our students are in holidays. But we will try to provide a communication between some of our students and your students in Teheran, so that some international project-management comes into action.
Die Teilnehmer
Das Ergebnis
Die Dokumentation
Users Guide, Test result of output terminals, Schematics
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