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Prediction of EVA Spacesuit’s Influence on Human Arm Strength Capability Based on Biomechanics
Author(s): 
Pages: 319-325
Year: Issue:  5
Journal: Space Medicine & Medical Engineering

Keyword:  biomechanical modelingEVA spacesuitstrength capabilityergonomics;
Abstract: Objective To study the application of biomechanical modeling methods in ergonomic assessment of human-EVA spacesuit working system and quantify the influence of EVA spacesuit on human arm strength capability. Methods Strength capability experiments were carried out in 9 subjects under both EVA spacesuit-unsuited and suited condition to collect the max force in 8 different functional tasks and the single joint isometric strength including the shoulder flexion / extension / adduction / abduction and the elbow flexion / extension.Based on the biomechanical simulation of these 8 functional tasks in unsuited and suited conditions for each subject,the relationship between the shoulder / elbow joint torque and the operation force on hand was established. Based on the relationship and the single joint isometric strength limit,the maximum hand operation force in functional tasks was predicted as the max strength capability for each subject. Then the predicted strength capability was compared with the measured max force for model validation. Results The predicted strength capability corresponded well with the measured force in both unsuited and suited condition. The way that the strength capability declined in different operation positions under suited condition was well predicted,while the predicted decline rate was lower than that of the measured. Conclusion The biomechanical modeling methods for modeling human-EVA spacesuit interaction and the strength capability prediction theory are effective for predicting the influence of EVA spacesuit on human arm strength capability in different postures and positions,which contributes to human factors analysis of human-EVA spacesuit working system.
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