Love from The University of Chalmers! Thats me, because when you pronounce Love differently you get my Swedish name.
Now and then I'm working on a project as a student, and I would like to share some of them with the rest of the world.
Apart from what could be expected, the blog won't be designated to mechatronic systems exclusively.
Hope you find something of interest.
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[VAWT] Affordable wind measurements
The shop Clas Ohlsson in Sweden sells a spare anemometer for the WH-1080 weather station for a hobbyist friendly price around 15 euros. This anemometer can probably be found in other countries too.
The WH-1080 spare anemometer
Here you can read about how to use this anemometer together with an Arduino or any other embedded system.
As we couldn't find any data on the characteristics of this sensor, we did our own calibration in a wind tunnel and the results are presented in the report above. This anemometer was used in a Bachelors Thesis project related to the devlopment of optimization of the Savonius Turbine, here tagged [VAWT].
Cut a barrel in half, mount it on a shaft and you have a windturbine. If the barrel is used, then what else probably would end up on a scrap heap is instead used for converting renewable energy.
Simplicity and low cost makes this an attractive option especially for societies with limited economy and a malfunctioning or non existing electric grid. Small off-grid electrical networks can be built and people who perhaps most needs electricity get that. Isn't that neat?
Savonius (from http://solarvan.co.uk/savonius)
An overlooked potential?
The Savonius though has a widespread reputation of having low effiency and is often dismissed as a credible option around forums and in formal litterature. However, when looking at the graph below from a publication Wortman did 1983, the effiency can be realtively high provided that the TSR(Tip-to-Wind-Speed-Ratio) is held at a correct value and the windmill should work quite nicely. In practice this could probably be done by controlling the generato…
You shouldn't judge a book by a cover they say, and likewise you shouldn't judge a project by what just meets the eye. During our current master thesis work I had the chance to get better acquainted with some of the works of among others Leonhard Euler and Joseph-Louis Lagrange. These people spent thousands of hours on things that have been beneficial to even the whole human race. Few people know this though.Why? Because the works consist of truckloads of books full of equations, and it is not as easy to see the use of this as for instance painting a wall or something that is easily recognized and valued.
This stands in contrast to Cubli. It makes use of abstract science in a way that is perceivable more easily. Although it is a great deal of fun to use the results of among others Euler and Lagrange for various things it is useful to also demonstrate the concrete use and validity of it for ourselves and others. Therefore we choose to do our master thesis around a Cubli base…