tag:blogger.com,1999:blog-1564958057737541664.post3068784410691715312..comments2024-02-14T17:11:22.168-08:00Comments on On Bicycles, and.... what else is there?: vibration data from MIT studydjconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-1564958057737541664.post-79133104082797451682010-01-12T12:59:00.982-08:002010-01-12T12:59:00.982-08:00Don : Problem solved. I'm reading the blog on ...Don : Problem solved. I'm reading the blog on Feed demon. Much friendlier to eye-sight. I thought common wisdom had it that writing with black on white background is the way to go. Yeah your blog does seem like a terminal window, well put there :)Unknownhttps://www.blogger.com/profile/12256394060474969622noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-65401240702313138052010-01-12T05:22:10.754-08:002010-01-12T05:22:10.754-08:00Wow -- the black background looks good on my Ubunt...Wow -- the black background looks good on my Ubuntu/Chromoium system But that light-on-black has always been my preference for terminal windows. Unfortunately the old X adage of "Mechanism not Policy" never really caught on in the zeal to tune everything to either Mac or Windoze look-and-feel, and the web is all about specifying every detail. Which brings up "embrace, extend, extinguish", but that's off topic.<br /><br />On comfort, there's two issues:<br />1. In the linear regime, what can be felt?<br />2. In the beyond-linear regime, ie significant hits, what can be felt?<br /><br />Honestly, I don't know. Looking at the MIT data and "spring-mass man", I have a hard time believing you're going to feel anything too far into the acoustic range. 35 Hz already seems a real stretch to me, and that was where carbon fiber seemed to have the strongest effect. Yet people claim carbon fiber is smoother than Al. I really can't say. My carbon fiber bike may take hits better than my older Al frame (now cracked, RIP.... Champoux had some good work on that subject, as well), but the Al frame had a steeper head tube.<br /><br />I test rode a Cannondale CAAD-9 a few months back and was shocked at how smooth it was on the appalling San Francisco streets in the SOMA district. If you'd have told me it was carbon, I'd have believed you, no problem.<br /><br />Note the lowest order modes are from tires. So tire pressure is the #1 thing. Then fork bending is next. So fork compliance is next. Then of course geometry is important, as that affects the moments.<br /><br />So the short version: "I don't know".djconnelhttps://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-60442938559312676382010-01-11T23:23:19.442-08:002010-01-11T23:23:19.442-08:00Nice post. A question after seeing all these graph...Nice post. A question after seeing all these graphs : Do you have confidence in the idea that reduced acceleration has any bearing on comfort or efficiency?<br /><br />P.S : I've been digging your posts but the black background is frankly a bit of an eyesore. I generally avoid reading blogs that play with your vision.Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.com