目的 研发与验证一种鞋带拉力测试系统的可靠性。 方法 对 3 个拉力传感器分别施加 0 ~ 196 N 增量载荷,每种载荷重复测试 9 次,重复测试过程中卸去负载并间隔 30 s,采集每种负荷下传感器的输出电压。 使用线性回归分析探究采集的电压信号与增量载荷之间的线性关系,使用准确度、精确度和一致性区间来验证测量值与真实载荷的一致性,通过 Bland-Altman 分析和组内相关系数(intra-group correlation coefficient,ICC)分析验证拉力传感器的重复性和可靠性。 结果 传感器的输出电压信号与载荷之间显著线性相关(P<0. 000 1,R2 = 0. 999 9),3 个感器 ICC>0. 999(P<0. 000 1)。 不同载荷下 3 个拉力传感器测量值变异系数的均值分别为 0. 003 8、0. 002 2 和0. 003 5。 结论 该鞋带拉力采集系统具有较高的可靠性,可以用于鞋带拉力的实时采集。
Objective To design and verify the reliability of a shoelace tensile test system. Methods Incremental loads of 0-196 N were applied to three tension sensors, each load was repeated nine times, with the load removed and interval of 30 s during the repeated tests. Then output voltage of the sensors under each load was collected. Linear regression analysis was used to explore linear relationship between the collected voltage signal and the incremental load. Accuracy, precision and consistency intervals were used to verify consistency of the measured values with the true load. Bland-Altman analysis and intra-group correlation coefficient (ICC) analysis were used to verify the repeatability and reliability of the tensile sensor. Results There was a significant linear correlation between output voltage signal of the sensors and the load (P< 0. 000 1, R2= 0. 999 9), and ICC of three sensors was above 0. 999 (P<0. 000 1). The mean values of the coefficients of variation of the measured values for three tensile sensors under different loads were 0. 003 8, 0. 002 2 and 0. 003 5, respectively. Conclusions The shoelace tensile test system has high reliability and can be used for real-time acquisition of shoelace tension.
魏书涛,郭新宇,汤运启,晏 彪,李灵君,李 立.一种基于微型传感器的鞋带拉力测试系统研制及可靠性研究[J].医用生物力学,2023,38(1):164-169复制