It might help if they program humanoid robots to ride bikes. The problem seems to be hard to analyze because there's a person on the bike, and the way the person moves with the bike is hard to track.
Fresh work on the mathematics of bicycles in motion
21–30 of 100 posts
Re: Fresh work on the mathematics of bicycles in motion
#22My master touched this. Used AI to find spoke patterns. http://master.matsemann.com
> There were untested geometries out there that could transform bike design.
Better hardware and simulations makes it easier to test thousands of these, possibly with the help of AI. I wonder if any drastically new designs will be found in the feature, or if time will show the current design is the best.
Re: Fresh work on the mathematics of bicycles in motion
#23Earlier quoted context omitted.
Yes! This PDF explains it very well, with illustrations, on the last page: http://bicycle.tudelft.nl/schwab/Bicycle/DO-07-3-2bicycles.p... "Practically nobody is conscious of the fact that they must steer briefly to the left ion order to make a right-hand turn. But this is not so strange, because the swerve is very small (approximately 3 degrees) and happens very quickly – 0.5 seconds. The wet tire tracks from cyclin…
It seems that they are saying you have to steer right in order to initiate a left lean. But how do they account for steering with no hands? I can steer pretty well without hands. It seems as if I must be able to initiate the left lean without pushing the handlebars right. So why couldn't I also do this when not riding without hands?
Pay attention to yourself next time you ride and you might be surprised.
Re: Fresh work on the mathematics of bicycles in motion
#24OK - this is probably my ignorance talking, but why is it surprising that bike are balanced? The pedals are basically shoulder width and staggered, which is a very natural position for people to balance in as bipedal creatures? in addition, while the bike is moving, won't the inertia tend to keep things moving in the same direction? This is all coupled by the fact that the rider is actively piloting and adjusting the…
Re: Fresh work on the mathematics of bicycles in motion
#25OK - this is probably my ignorance talking, but why is it surprising that bike are balanced? The pedals are basically shoulder width and staggered, which is a very natural position for people to balance in as bipedal creatures? in addition, while the bike is moving, won't the inertia tend to keep things moving in the same direction? This is all coupled by the fact that the rider is actively piloting and adjusting the…
Re: Fresh work on the mathematics of bicycles in motion
#26Earlier quoted context omitted.
Yes! This PDF explains it very well, with illustrations, on the last page: http://bicycle.tudelft.nl/schwab/Bicycle/DO-07-3-2bicycles.p... "Practically nobody is conscious of the fact that they must steer briefly to the left ion order to make a right-hand turn. But this is not so strange, because the swerve is very small (approximately 3 degrees) and happens very quickly – 0.5 seconds. The wet tire tracks from cyclin…
It seems that they are saying you have to steer right in order to initiate a left lean. But how do they account for steering with no hands? I can steer pretty well without hands. It seems as if I must be able to initiate the left lean without pushing the handlebars right. So why couldn't I also do this when not riding without hands?
Fun fact: when I read about it I had to test and I had to make sure I wasn't deceiving myself so I put one palm in front of the handle on one side and the other one behind the handle on the other side. That way I could ensure I pushed it the correct way.
It worked exactly as advertised (50cc bike so somewhere below 60km/h).
Much simpler than using slow motion camera etc.
Re: Fresh work on the mathematics of bicycles in motion
#27It might help if they program humanoid robots to ride bikes. The problem seems to be hard to analyze because there's a person on the bike, and the way the person moves with the bike is hard to track.
See Murata's Robots: http://www.murata.com/en-us/about/mboymgirl
Re: Fresh work on the mathematics of bicycles in motion
#28Earlier quoted context omitted.
Yes! This PDF explains it very well, with illustrations, on the last page: http://bicycle.tudelft.nl/schwab/Bicycle/DO-07-3-2bicycles.p... "Practically nobody is conscious of the fact that they must steer briefly to the left ion order to make a right-hand turn. But this is not so strange, because the swerve is very small (approximately 3 degrees) and happens very quickly – 0.5 seconds. The wet tire tracks from cyclin…
It seems that they are saying you have to steer right in order to initiate a left lean. But how do they account for steering with no hands? I can steer pretty well without hands. It seems as if I must be able to initiate the left lean without pushing the handlebars right. So why couldn't I also do this when not riding without hands?
Re: Fresh work on the mathematics of bicycles in motion
#29OK - this is probably my ignorance talking, but why is it surprising that bike are balanced? The pedals are basically shoulder width and staggered, which is a very natural position for people to balance in as bipedal creatures? in addition, while the bike is moving, won't the inertia tend to keep things moving in the same direction? This is all coupled by the fact that the rider is actively piloting and adjusting the…
Re: Fresh work on the mathematics of bicycles in motion
#30Avid cyclist, but I have no idea what this is talking about: "...the phenomenon of 'countersteering', whereby the rider can steer to the left only by first briefly torquing the handlebars to the right, allowing the bike to fall into a leftward lean." Am I just doing this subconsciously?
It's wildly unintuitive, so don't feel bad. When I was first learning to ride a motorcycle with the MSF, I damn neared dumped the practice bike a few times trying to manhandle it. You'll really quickly internalize push-left-go-left. And it turns out to work great on regular bikes, too. (But it's terrifyingly more responsive - I actually can't relax pedaling a bicycle because of the fear of how easy it is to flip the…
Well yes, seeing as that's how you steer a bicycle. As a keen cyclist it annoys me when people (especially coaches) start harping on about countersteering being an additional technique you should learn, when it's what everyone has been doing intuitively since they first learned to ride a bike.