Date

2014

Document Type

Thesis

Degree

Master of Science

Department

Mechanical Engineering

First Adviser

Chew, Meng Sang

Abstract

The purpose of the research is to analyze a real system that is used to assist patients for lower-limb rehabilitation. The mechanism is based on a rotatable parallelogram linkage structure. Two groups of extension springs are used to suspend the weight of both the system and patients. During application, an adjustable proportion of users' body weight can be suspended. In an ideal design, equations have been derived for determining the spring constants for any given suspended weight. These equations govern both initial conditions and adjustment conditions. Factors affecting the system parameters as well as adjusting method are discussed. In the actual system, factors that were not previously considered have been taken into consideration. Revised equations are provided with regard to real prototype. 3D models of all necessary parts are created for building prototype.

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