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Beach volleyball, beach flags, long jump, triple jump, and so on are competitions that are played on sand areas. The competitors are affected by the dynamics of the sand that are different from those on hard surfaces. Little has been reported on developing a simulation model that can enable the creation of an optimal motion on sand, considering the motor skills and biological loads. The purpose of this paper is to develop a coupled simulation model of humans and sand areas by modeling a human body and sand as a musculoskeletal model and particle model. In addition to the development of the coupled simulation model, we apply it to optimizing simulations that enable us to search for optimal parameters relative to the coupled model, such as optimal motor skills on sand. As an example, we analyzed long jump landing and obtained results that optimized landing motions and combination ratios of different sand particles relative to the biological loads for effective training and optimal design of sand areas.

Development of a Coupled Optimizing-Simulation Model of Humans and Sand Areas