Design and Development of a 3-DOF Balance System
| Autor: | Jin-Yu Lee, 李金育 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 Most of commercial systems for evaluating the static and dynamic standing balance are only single axial simulation with limited evaluation modes. However, the events affecting our balance in daily living often involves disturbances in several degrees of freedom (DOF). For clinical diagnosis and treatment in standing and walking ability, a powerful and multi-direction controllable instrument for balance evaluation is necessary. The purpose of this study was to design and develop a 3-DOF balance system which can be used for balance evaluation and training to restore functions for patients clinically. The developed equipment was controlled in three DOF movements including forward/backward translation, toe up/toe down tilt, and clockwise/counterclockwise rotation. The positions of the standing platform during motion were recorded by three incremental encoders which are installed in three motion axes, respectively. Four load cells were installed under the platform to measure the ground reaction force and estimate center of pressure (COP) as an index of balance function and feedback controlling the movements of the plate for balance training. In order to increase the precision and structure stability in motion, this system use a ball bearing screws, gears and belt drives to drive the designed movement. The loading sensory system, consisting of 4 single axis load cells, was connected to a personal computer (PC) through an analog to digital board for data acquisition and desired movement control was preformed in PC. The program of balance system controller was designed to be user friendly, functional, and easy to use. In addition, it included several tools of analysis and statistics for further evaluation. The sway area, the COP normalized by the base of support (BOS) acquiring from subjects, was used to analyze the suject’s postural stability and balance reaction. The precision test of instrument shows that the standard deviation of position was less than ±2mm, and the time difference of speed was small enough to be neglected. In laboratory postural balance controlling examination, we measured 6 adults, separating into two groups. Group A consists of 3 patients with deficient in musculoskeletal and vestibular system, and group B with 3 healthy adults was taken as control group. By analyzing the sway area of COP/BOS ratio, the results indicated that the sway area ratio scope of group A was greater than group B with more significant in multi-direction test compared to single-direction test. In conclusion, we developed a balance master system with 3 degrees of freedom which can quantitatively measure the balance function and be suitable for future clinical and research applications to simulate the events in daily activities. The future study is suggested to integrate with other perturbation equipments, such as eye-goggle for visual simulation, to reveal the interaction of visual-vestibular-perception function that may reflect the reaction or motor deficit of our balance outcome. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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