Perceived discomfort functions based on joint moment for various joint motion directions of the upper limb
We formulate the relationship between perceived discomfort and joint moment ratio for the upper limb. The relationships for twelve joint motion directions are formulated by considering between-subject variability. The L-R fuzzy number was applied to deal with the variability of perceived discomfort among subjects. We compare three approximation models (linear, exponential, and logistic function models) in terms of their accuracy. The logistic function model provides the best fit to the history of perceived discomfort among the three models.
perceived discomfort fuzzy numbers biomechanics function approximation human diversity