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首页> 外文期刊>Journal of Biomechanics >Estimation of stride length in level walking using an inertial measurement unit attached to the foot: a validation of the zero velocity assumption during stance.
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Estimation of stride length in level walking using an inertial measurement unit attached to the foot: a validation of the zero velocity assumption during stance.

机译：使用附着在脚上的惯性测量单元估算水平行走中的步幅：在站立过程中对零速度假设的验证。

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摘要

In a variety of applications, inertial sensors are used to estimate spatial parameters by double integrating over time their coordinate acceleration components. In human movement applications, the drift inherent to the accelerometer signals is often reduced by exploiting the cyclical nature of gait and under the hypothesis that the velocity of the sensor is zero at some point in stance. In this study, the validity of the latter hypothesis was investigated by determining the minimum velocity of progression of selected points of the foot and shank during the stance phase of the gait cycle while walking at three different speeds on level ground. The errors affecting the accuracy of the stride length estimation resulting from assuming a zero velocity at the beginning of the integration interval were evaluated on twenty healthy subjects. Results showed that the minimum velocity of the selected points on the foot and shank increased as gait speed increased. Whereas the average minimum velocity of the foot locations was lower than 0.011 m/s, the velocity of the shank locations were up to 0.049 m/s corresponding to a percent error of the stride length equal to 3.3%. The preferable foot locations for an inertial sensor resulted to be the calcaneus and the lateral aspect of the rearfoot. In estimating the stride length, the hypothesis that the velocity of the sensor can be set to zero sometimes during stance is acceptable only if the sensor is attached to the foot.
机译：在各种应用中，惯性传感器用于通过随时间对其坐标加速度分量进行两次积分来估计空间参数。在人体运动应用中，加速度计信号固有的漂移通常是通过利用步态的周期性来减少的，并且在某些情况下传感器的速度为零的假设也可以减少。在这项研究中，后一种假设的有效性是通过在步态周期的站立阶段以三种不同速度在水平地面上行走时确定脚和小腿选定点的最小前进速度来进行研究的。在二十个健康受试者上评估了由于在积分间隔开始时假设速度为零而影响步幅长度估计准确性的误差。结果表明，步态速度增加时，脚和小腿上选定点的最小速度增加。脚部位置的平均最小速度低于0.011 m / s，而脚部位置的速度高达0.049 m / s，对应于步幅长度的百分比误差等于3.3％。结果，惯性传感器的最佳脚部位置是跟骨和后脚的侧面。在估计步幅时，只有在传感器安装到脚上的情况下，有时可以在站立期间将传感器的速度设置为零这一假设是可以接受的。

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