Ambulatory assessment of human segmental orientation using accelerometers

作者：Liu Kun^*; Han Xuan; Liu Zheng

来源：Journal of Jilin University (Engineering and Technology Edition), 2014, 44(4): 1016-1023.

DOI：10.13229/j.cnki.jdxbgxb201404018

• Ambulatory assessment
• Clinical settings
• Local coordinate system
• Segmental orientation
• Three-dimensional (3D) space
• Triaxial accelerometer
• Two degrees of freedom
• Wearable sensor systems

A new method using a double-sensor difference based algorithm for analyzing human segment rotational angles in two directions for segmental orientation analysis in three-dimensional (3D) space was presented. A wearable sensor system based only on triaxial accelerometers was developed to obtain the pitch and yaw angles of thigh segment with an accelerometer approximating translational acceleration of the hip joint and two accelerometers measuring the actual accelerations on the thigh. To evaluate the method, the system was tested on a mechanical arm of two degrees of freedom and on the thighs of eight volunteer subjects. The results show that, without integration and switching between different sensors, using only one kind of sensor, the wearable sensor system is suitable for ambulatory analysis of normal gait orientation of thigh and shank in two directions of the segment-fixed local coordinate system in 3D space. It can then be applied to assess spatio-temporal gait parameters and monitoring the gait function of patients in clinical settings.

• 出版日期2014