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The majority of studies on mastication movements have focused on chewing movements. In recent years, however, it has come to be thought that tongue action also plays a very important role in masticatory movements.

This paper focuses on a dynamic behaviour of mass measurement system to achieve dynamic measurement of the mass of a target object. To improve an accuracy of mass measurement, we have investigated an effect of a fulcrum point position shift via simulation. In this paper, we design a new experimental system that can evaluate the effect of the fulcrum point position shift. Also, we propose a new model of our mass measurement system with consideration of the fulcrum point position shift. To evaluate a validity of the proposed model of our mass measurement system, we compare experimental results with simulation results. After that we discuss an effectiveness of our proposed mathematical model of our mass measurement system.