Dynamic modelling and simulation of the human body motions in different situations

A few different methods are used for the modelling of the human motion. Basically, one of the these methods based on the Newton?s second law is the inverse dynamics approach. This approach which is the subject of a limited number of research until 1970s has started to create more interest with the expansion of the commercial force platforms and development of the computer systems. Inverse dynamics method is the process by which force and moments are indirectly determined from the kinematics and inertial properties of moving bodies.In this thesis, a human body has been composed as a 6 rigid-open loop-body model which is consisted of a foot, a leg, a thigh, a trunk, an arm and a forearm. To determine the anthropometric characteristics of the bodies has been benefited from anthropometric models and the computer software. The movements of the subject markers placed on body were viewed with a video camera in order to get location data of joints and the digitization process was made. It was computed the angular displacement, angular velocity and angular acceleration of the joints using by MATLAB (7.6.0). The obtained data was used to actuate inverse dynamics model which is created by SimMechanics (2.7.1).Motion of standing of different sitting heights, motion of squat-stand, motion of lifting load and motion of climbing up different steps were simulated by using SimMechanics software. It was compared ground reaction forces calculated by SimMechanics with ground reaction forces measured by force platform. This study was also shown that SimMechanics software which is developed to analyse mechanical systems in real dimensions dynamically can be used for human motion analysis. Furthermore, the simulating processes have been useful to explain kinetic behaviour of the human movements.