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  1. Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
  2. Path: sparky!uunet!uvaarpa!darwin.sura.net!sgiblab!spool.mu.edu!howland.reston.ans.net!paladin.american.edu!auvm!EEIUC.ERICSSON.SE!EEIGCN
  3. Message-ID: <9301271542.AA22450@eeiuc>
  4. Newsgroups: bit.listserv.frac-l
  5. Date:         Wed, 27 Jan 1993 15:42:43 GMT
  6. Sender:       'FRACTAL' discussion list <FRAC-L@GITVM1.BITNET>
  7. From:         Gerry Callaghan <eeigcn@EEIUC.ERICSSON.SE>
  8. Subject:      Re: Chaotic modeling
  9. Lines: 40
  10.  
  11. P.J van Dok was asking about modelling chaotic systems.
  12.  
  13. An interesting chaotic system to model is a double pendulum set.
  14. There was an article and construction details in the U.S. magazine
  15. 'Amateur Scientist' last Summer (I'm at work and don't have the reference )
  16.  
  17. Let's see if I can draw it
  18.  
  19.                                 A
  20.                 ...............[  ].............
  21.                                |0 |     Fixed beam
  22.                 ...............|  |.............
  23.                                |  |
  24.                                |  |
  25.                                |  |
  26.                                |  |
  27.                                ...|
  28.                               \  \|
  29.                                \0 \  B
  30.                                 \  \
  31.                                  \  \
  32.                                   \  \
  33.                                    \  \
  34.                                     \  \  Weight
  35.                                     <<< >>>
  36.                                     <<< >>>
  37.  
  38. The system can rotate at both points A and B. A LED and battery can be
  39. mounted on the lower arm for interesting time delay photographs.
  40. It exhibits an astonishing range of chaotic behaviour.
  41. This  might be easier to model than a pendulum that moves in 360 degrees
  42. as it stays in one plane.
  43.  
  44. I'd love to see the wheel too!
  45. Gerry
  46.  
  47. Gerry Callaghan                 Email:  eeigcn@eeiuc.ericsson.se
  48. Ericsson System Expertise       Phone:  +353 902 74601 ( work )
  49. Cornamaddy, Athlone                              85054 ( home )
  50. Co. Westmeath, Irish Republic
  51.