助行器智能转弯意图感知和摔倒检测  

Turn intention perception and fall detection for smart walkers

作　　者：孙志杰[1] 郭欣[1] 兰陟 王强 SUN Zhijie;GUO Xin;LAN Zhi;WANG Qiang(Hebei University of Technology,Tianjin 300401,China;National Research Center for Rehabilitation Technical Aids,Beijing 100176,China;Beijing Key Laboratory of Rehabilitation Technical Aids for Old-age Disability,Beijing 100176,China;Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs,Beijing 100176,China)

机构地区：[1]河北工业大学,天津市300401 [2]国家康复辅具研究中心,北京市100176 [3]北京市老年功能障碍康复辅助技术重点实验室,北京市100176 [4]民政部康复辅具技术与系统重点实验室,北京市100176

出　　处：《中国康复理论与实践》2023年第7期849-855,共7页Chinese Journal of Rehabilitation Theory and Practice

基　　金：国家重点研发计划项目(No.2020YFC2007502)。

摘　　要：目的提高助行器智能抗摔倒功能,加强安全保障。方法在助行器两侧手柄上放置压力传感器,手动标注对应的运行意图标签,使用支持向量机(SVM)分类器进行模型预测,预测助行器的行驶意图,得到混淆矩阵。在使用者腰部佩带陀螺仪,助行器上安装激光传感器,通过陀螺仪检测角速度和角加速度,激光传感器测量距离,两者结合检测使用者摔倒情况。结果SVM建立的分类器模型能成功预测助行器的直行、左转和右转3种状态。当合角速度>100°/s、合角加速度>1.3 G、Z轴角加速度>0.7 G或<0.2 G、距离>600 mm或<300 mm,提示使用者摔倒。结论本研究设计的助行器可以感知使用者的转弯意图,并检测使用者摔倒情况。Objective To improve the anti-fall capacity and safety of the smart walkers.Methods Two pressure sensors were placed on the handles on both sides of the walker.The confusion matrix was obtained,the corresponding operational intent labels were manually labeled,using a support vector machine(SVM)classifier for model prediction to predict the travel intent of the users.The user wore a gyroscope and the walker was equipped with a laser sensor,to measure the angular velocity,angular acceleration and the distance data,respectively,to detect the user's fall.Results The classifier model established by SVM successfully predicted three operating states of the walker,namely straight ahead,left turning and right turning.The user's fall was detected by the sudden change of the following data:the combined angular velocity was greater than 100°/s,the combined angular acceleration was greater than 1.3 G,the angular acceleration of Z-axis was greater than 0.7 G or less than 0.2 G,and the distance was greater than 600 mm or less than 300 mm.Conclusion The improvement of the walker can predict the turn intention of the user,and detect the user's fall.

关 键 词：助行器机器人 转弯意图感知 摔倒检测 

分 类 号：R496[医药卫生—康复医学]