Prediction of fluid forces acting on a hand model in unsteady flow conditions
Prediction of fluid forces acting on a hand model in unsteady flow conditions
复制标题
DOI：
10.1016/j.jbiomech.2007.12.007
复制
发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Vennell, Ross
中科院分区：
文献类型：
--
作者：
Kudo, Shigetada;Yanai, Toshimasa;Vennell, Ross
本研究的目的是开发一种方法来预测流体力作用在人的手在非定常流游泳条件。建立了一个由滑轮链机构和测力传感器组成的机械系统，用于在流体流动中旋转手模型。为了测量手模型的角位移，将电位计附接到旋转轴。手模型，然后固定在各种角度的纵轴的手模型和旋转在不同的流速在游泳水槽中的258个不同的试验，以近似游泳者的中风在不稳定的流动条件。从嵌入手模型中的12个传感器以200 Hz的采样频率获取压力。然后，基于在200 Hz的频率下从机械系统获取的动力学和运动学数据来确定作用在手模型上的合成流体力。应用逐步回归分析获得高阶多项式方程，该方程从12个压力值预测作用在加速手模型上的流体力。在所有试验中，测得的合成流体力与从单个最佳拟合多项式方程预测的合成流体力之间的均方根（RMS）差为5 N。在本研究中开发的方法准确地预测了流体的力量作用在手模型。(C)2007爱思唯尔有限公司保留所有权利。
The aim of this study was to develop a method to predict fluid forces acting on the human hand in unsteady flow swimming conditions. A mechanical system consisting of a pulley and chain mechanism and load cell was constructed to rotate a hand model in fluid flows. To measure the angular displacement of the hand model a potentiometer was attached to the axis of the rotation. The hand model was then fixed at various angles about the longitudinal axis of the hand model and rotated at different flow velocities in a swimming flume for 258 different trials to approximate a swimmer's stroke in unsteady flow conditions. Pressures were taken from 12 transducers embedded in the hand model at a sampling frequency of 200 Hz. The resultant fluid force acting on the hand model was then determined on the basis of the kinetic and kinematic data taken from the mechanical system at the frequency of 200 Hz. A stepwise regression analysis was applied to acquire higher order polynomial equations that predict the fluid force acting on the accelerating hand model from the 12 pressure values. The root mean square (RMS) difference between the resultant fluid force measured and that predicted from the single best-fit polynomial equation across all trials was 5 N. The method developed in the present study accurately predicted the fluid forces acting on the hand model. (C) 2007 Elsevier Ltd. All rights reserved.