Website of WHPSC Simulator here.
The code solves an energy balance equation by considering an interval initial time t0 and end time t1, the equation is given by
where on the right-hamd side:
is the kinetic’s energy difference.
the rider’s energy input.
potential energy difference generated by the road’s slope.
accounts for the dissipated energy by rolling resistance and air drag.
Coefficients for rolling resistance (Cr) and drag resistance (Cd) are needed for the energy balance equation. For the road bike Cr’s initial value at 0.1 m/s is taken as Cr = 0.005 (relatively smooth asphalt, mid-market 28’ tyres) and Cd = 0.68 at 15 m/s (see ‚CFD ‚analysis of an exceptional cyclist sprinter position‘, Blocken et al.). Slope for Cd is that for the recreational bike mentioned in ‚Bicycle ‚aereodynamics: an experimental evaluation methodology (Chowdhury, H., Alam, F.). Cr is varied according to our own data for a 28‘ tyre. Cd’s value for the unfaired recumbent bike is taken basing on CdA = 0.18 at at 50 km/h (see The Recumbent Bicycle and Human Powered Vehicle Information Center) and Area = 0.2. An interpolation of this curve yields values for Cd at speeds different from 50 km/h. Cr stays unchanged with respect to the road bike. Coefficients for Taurus are set with values similar to its estimated ones. Shape is maintained, but with respect to a different reference value at v=120 km/h, which is Cd(v=120 km/h) = 0.04. Cr's values are experimental values obtained.
| Vehicle | Cd@120 km/h | Cr | Frontal Area (m²) |
|---|---|---|---|
| Road bike | 1.036Cd(v=120km/h) at 0.1 m/s; slope = - 2.8810^{-4} , yielding Cd = 1.0933 at 20 m/s | 0.005 at 0,1 m/s;slope = + 3*10^{-6} every 0.1 m/s, yielding Cr = 0.0056 at 20 m/s | 100 < h <= 165 => 0.34; 165 < h <= 175 => 0.38; 175 < h <= 185 => 0.43; 185 < h <= 200 => 0.48 |
| Unfaired recumbent bike | same as above | same as above | 100 < h <= 165 => 0.26; 165 < h <= 175 => 0.29; 175 < h <= 185 => 0.32; 185 < h <= 200 => 0.36 |
| Taurus | 1.48430.04 at 0.1 m/s; 1.06910.04 at 40 m/s | 0.0029 at 0.1 m/s; 0.0045 at 40 m/s | 0.04 |
Shape of cx curve of Taurus
- Go to whpsc-sim.policumbent.it
- Connect your bluetooth powermeter. (This functionality is available only in Google Chrome 83+)
- Start a new run
- How you can see here, Linux version of bluettoth API are partially implemented and not supported. So you need to enable
chrome://flags/#enable-experimental-web-platform-features. - Go to whpsc-sim.policumbent.it
- Connect your bluetooth powermeter. (This functionality is available only in Google Chrome 83+ and on linux may not work)
- Start a new run
- Android: Requires Android 6.0 Marshmallow or later.
- Mac: Requires OS X Yosemite or later. (Some MacBooks may not work: Check "About this Mac" / "System Report" / "Bluetooth" and verify that Low Energy is supported.)
- Linux: Requires Kernel 3.19+ and BlueZ 5.41+ installed. Read How to get Chrome Web Bluetooth working on Linux.(Note that Bluetooth daemon needs to run with experimental interfaces if BlueZ version is lower than 5.43: sudo /usr/sbin/bluetoothd -E)
- Windows: Requires Windows 10 version 1706 (Creators Update) or later.
Thanks goes to these wonderful people (emoji key):
 Stefano Loscalzo 💻 🤔 |
 FelAcke 📖 |
 Gabriele Belluardo 💻 |
This project follows the all-contributors specification. Contributions of any kind welcome!