Bascou Joseph, Sauret Christophe, Pillet Hélène, Vaslin Philippe, Thoreux Patricia, Lavaste François
LBM, Arts et Métiers Paristech, 151 Bd de l'Hôpital, Paris, 75013, France.
Comput Methods Biomech Biomed Engin. 2013 Apr;16(4):381-91. doi: 10.1080/10255842.2011.623673. Epub 2012 Jan 20.
This article presents an examination and validation of a method to measure the field deceleration of a manual wheelchair (MWC) and to calculate the rolling resistances properties of the front and rear wheels. This method was based on the measurements of the MWC deceleration for various load settings from a 3D accelerometer. A mechanical model of MWC deceleration was developed which allowed computing the rolling resistance factors of front and rear wheels on a tested surface. Four deceleration sets were conducted on two paths on the same ground to test the repeatability. Two other deceleration sets were conducted using different load settings to compute the rolling resistance parameters (RPs). The theoretical decelerations of three load settings were computed and compared with the measured decelerations. The results showed good repeatability (variations of measures represented 6-11% of the nominal values) and no statistical difference between the path results. The rolling RPs were computed and their confidence intervals were assessed. For the last three sets, no significant difference was found between the theoretical and measured decelerations. This method can determine the specific rolling resistance properties of the wheels of a MWC, and be employed to establish a catalogue of the rolling resistance properties of wheels on various surfaces.
本文介绍了一种测量手动轮椅（MWC）的场减速并计算其前后轮滚动阻力特性的方法的检验与验证。该方法基于通过三维加速度计对不同负载设置下MWC减速的测量。建立了MWC减速的力学模型，该模型能够计算测试表面上前后轮的滚动阻力系数。在同一地面的两条路径上进行了四组减速测试，以检验重复性。另外两组减速测试使用不同的负载设置来计算滚动阻力参数（RP）。计算了三种负载设置下的理论减速度，并与测量的减速度进行了比较。结果显示出良好的重复性（测量变化占标称值的6 - 11%），且路径结果之间无统计学差异。计算了滚动RP并评估了其置信区间。对于最后三组，理论减速度与测量减速度之间未发现显著差异。该方法可以确定MWC车轮的特定滚动阻力特性，并用于建立各种表面上车轮滚动阻力特性的目录。
