Yoganandan Narayan, Humm John, Schlick Michael, Pintar Frank
Department of Neurosurgery, Medical College of Wisconsin, VA Medical Center, Milwaukee, WI, USA.
Biomed Sci Instrum. 2008;44:256-61.
This study compared linear and angular accelerations and angular velocities of the head using two systems. The first sensor was a custom-developed pyramid nine accelerometer package (PNAP) in 3-2-2-2 configuration. The three corners of the base contained two biaxial accelerometers in the 2-2-2 array, and the vertex contained the tri-axial accelerometer. The second sensor was a recently available angular rate sensor. Both sensors were mounted on the periphery of the head of an intact post mortem human cadaver specimen (PMHS), exposed to impact loading. Using the dynamic equations of equilibrium and geometric properties of the head of the PMHS, linear location-specific acceleration data from the PNAP device were transformed to head angular accelerations and velocities and linear accelerations at its center of gravity. Using recorded angular velocity data from the rate sensor, angular and linear accelerations were obtained. A comparative evaluation of these data indicated that the angular rate sensor is preferable for rotational velocities and the PNAP device for angular accelerations. A combination of angular velocity data from the rate sensor and angular acceleration data from the PNAP device produced the most preferable temporal linear acceleration data at the center of gravity of the head. It may be prudent to use both sensors to obtain linear and angular acceleration and rotational velocity data from impact tests.
本研究使用两种系统比较了头部的线性加速度、角加速度和角速度。第一个传感器是一个定制开发的呈3-2-2-2配置的金字塔形九轴加速度计组件（PNAP）。基座的三个角在2-2-2阵列中包含两个双轴加速度计，顶点包含三轴加速度计。第二个传感器是一个最近可用的角速率传感器。两个传感器都安装在一具完整的尸体标本（PMHS）头部的外周，使其承受冲击载荷。利用PMHS头部的动态平衡方程和几何特性，将来自PNAP装置的特定位置的线性加速度数据转换为头部的角加速度、角速度以及其重心处的线性加速度。利用速率传感器记录的角速度数据，获得角加速度和线性加速度。对这些数据的比较评估表明，角速率传感器对于旋转速度更适用，而PNAP装置对于角加速度更适用。速率传感器的角速度数据和PNAP装置的角加速度数据相结合，能在头部重心处产生最理想的瞬时线性加速度数据。在冲击试验中使用这两种传感器来获取线性加速度、角加速度和旋转速度数据可能是明智的。
