(Sorry if this is a duplicate - it seems my previous reply ended up malformed somehow)
Hi Vi,Just in passing, to run windows executables directly from Linux, you can use "wine" (see http://www.winehq.org). Alternatively, if you have at hand a Windows OS to install, you can do so in a virtual environment running from Linux. I am using VirtualBox (http://www.virtualbox.org/) on a Mac to have virtual Linux and virtual Windows in similar cases as you, it works perfectly (better than wine for me for Windows executables). (VBox also runs on Linux and Windows, so you can have access to the missing virtual OS in any case.)
For your dynamics study (but I think it is quite a tricky problem), you might be interested in the scientific article by Meijaard et al. (2007) "Linearized dynamics equations for the balance and steer of a bicycle: a benchmark and review", Proc. Roy. Soc. A 463:1955-1982. Full text is available there from the journal, see pdf link on that page: http://dx.doi.org/doi:10.1098/rspa.2007.1857
Other publications by one of the co-authors can be found there: http://audiophile.tam.cornell.edu/~als93/Publications/papers.htmIt is applied to conventional bicycle designs, but you might be inspired by their mathematical/computational methods.
Hope this helps, Regards, Pascal On Thu, 17 Mar 2011, Vi Vuong wrote:
Hi Dirk,Just for you, I swapped out the rear wheels to vary pivot angles, from 26, 16, 12, to 6in to get 60-52deg. Surprise, they are all ridable. In fact the smaller wheels feel more stable than 26in. Seat height may have something to do with it, and possibly the wheels themselves. Here is video of the test ride. http://www.youtube.com/watch?v=5JUg0zIHSuMRegarding your program, assuming the geometry calculation is OK, the seat rise peak still suggests a critical point, compared to the slopes on either side. I will flip the rear frame back to normal and test 48deg downward until it scraps the ground, to confirm the critical point hypothesis. Searching the archive, it seems that Ray had written a program (python?) that included forces on the geometry, http://rjs.org/Python/FrameGeometry.zip compiled for Windows, so I have to figure out a way run it in Linux. I may take a shot at coding my own to study dynamics, which may take a while...Vi
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