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cds-0.blogspot.com

CDS-0: A minimal bike geometry

http://cds-0.blogspot.com/2013/11/a-minimal-bike-geometry.html

Friday, November 29, 2013. A minimal bike geometry. With this post I want to start a project that I've got in my mind for quite a long time. I've got a very busy year ahead so I don't know if I will be advancing as fast as I would like to. As a first step, I want to define a minimal set of parameters that could determine completely the dynamic behaviour of a bike. Let's take a look to a typical bike geometry chart:. Specialized Venge 2014 geometry chart. Taking all this into account, we can say that a mi...

cds-0.blogspot.com

CDS-0: Trek and Specialized investigate on bicycle dynamics

http://cds-0.blogspot.com/2013/12/trek-and-specialized-investigate-on.html

Wednesday, December 25, 2013. Trek and Specialized investigate on bicycle dynamics. After the optimisation work that the F1 chassis builder did for the carbon layup of the Venge McLaren, McLaren and Specialized continue to cooperate. This time, McLaren is focusing on studying the dynamic behaviour of bikes and analyzing how it can be improved tuning the mechanical characteristics of the frame. Bikeradar has the full story. As the McLaren engineer says, both vertical (through the relation between Crr and ...

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CDS-0: February 2013

http://cds-0.blogspot.com/2013_02_01_archive.html

Tuesday, February 19, 2013. Just a short post to show the tire-road contact model that I will use for the dynamical model of a bicycle that I'm developping. The model is fully "analytical", no multi-body software used. There are some secundary features lacking but the core is already done. As you can see just after the impact, this road profile-wheel combination is near the limit of the single contact point condition that the majority of tire load models use. Some plots:. Subscribe to: Posts (Atom).

cds-0.blogspot.com

CDS-0: Dynamical model. Introduction

http://cds-0.blogspot.com/2013/09/dynamical-model-introduction.html

Thursday, September 12, 2013. Dynamical model. Introduction. After those two simpler models, I decided to devote more time to the development of the dynamical model. It started with a tire model able to handle discontinuous contact. Later, I tried to build the whole system around this tire model without success so I decided to step back and add elements to the model progressively. A quick animation. Take a look at how the BB and the chain moves during the downstroke ;). More soon. Thanks for reading!

cds-0.blogspot.com

CDS-0: Dynamical model. Modelling bike compliance

http://cds-0.blogspot.com/2013/09/dynamical-model-modelling-bike.html

Thursday, September 19, 2013. Dynamical model. Modelling bike compliance. How to modelize the compliance of a bike in a dynamic model. S a very good que. Type of model u. S, the area that analyze. S the deformation of element. S in dynamic condition. S There are more complex model. Sed in a FEA formulation of the deformable component. S of kinematical coordinate. S that can be found in. S Flex or Altair Hyperwork. S For the moment, I didn't want to go a. Sed on connecting certain element. S Now the que.

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CDS-0: March 2012

http://cds-0.blogspot.com/2012_03_01_archive.html

Friday, March 23, 2012. The return of the legend. After the latest regulation craze of the UCI, it's nice to hear these words:. Saturday, March 17, 2012. Rim and disc brakes. Rear end vertical stiffness. To simplificate things, I have considered the rear end to be plane and formed by two identical tubes. I have also applied linearity (small strain) in the system to avoid having also to consider inertial and slipping forces due to deceleration. If something isn't clear, don't hesitate to ask. Rim and disc...

cds-0.blogspot.com

CDS-0: January 2013

http://cds-0.blogspot.com/2013_01_01_archive.html

Sunday, January 27, 2013. The program can be downloaded from the following link. I have enclosed some data samples in the file to show the data structure that the program handles. Yaw calculator v.1.0. Don't forget to run MCRInstaller before running the app. Have fun and please report any bugs. Saturday, January 5, 2013. Κ, shape factor of the Weibull distribution. λ, scale parameter of the Weibull distribution. va, average wind speed. An example. Weibull distribution for bike speeds:.

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CDS-0: June 2013

http://cds-0.blogspot.com/2013_06_01_archive.html

Thursday, June 20, 2013. Long time without posting because I was very busy the last few months. Now I've got some free time and I will try to complete the dynamical model. Right now, I am developping accurate pedal force profiles for variable cadence and/or power and a tuneable automatic drivetrain (something similar to the SRAM Automix IGH). The upper body and the elastic couplings between the rider and the bike aren't modelised yet but I will add them later. More soon. Thanks for reading!

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CDS-0: November 2012

http://cds-0.blogspot.com/2012_11_01_archive.html

Friday, November 9, 2012. Drag to time savings. As you can see, the phenomenon that causes the paradox that I have already commented is present here. Drag savings in real world are smaller than in the wind tunnel because the speed increase causes a yaw reduction and, consequently, a small drag increase. The error is maximized for yaws near stall angle, when the derivative of drag with respect to yaw is bigger. That's all for today. Thanks for reading! Friday, November 2, 2012. Subscribe to: Posts (Atom).

climbindex.eu

European Climb index - Mehrleistung beim Radfahren auf bergigen Strecken

http://www.climbindex.eu/TuBergpage/TUD_BP-bergbilanz.php

Def bold#1{ bf #1} newcommand{ d}{ mathrm{d} ). Bike parts to avoid. Average power on climb stage. But you don't fly up a hill. You struggle slowly and painfully up a hill.". Wir fahren in die Berge, darum wird es langsamer." Wer kennt sie nicht, diese Aussage. Aber was steckt wirklich dahinter? Oft werden Dinge einfach daher gesagt, aus dem Bauch heraus, ohne den Wahrheitsgehalt zu kennen. Der Beweis, dass diese Aussage dennoch ihre Wahrheit hat, möchte ich an der Stelle liefern. Mithilfe der Geschwindi...