چكيده به لاتين
Abstract:
In this thesis, four novel biomechanical model are presented to investigate the vibration in x-z-y directions for a specific frequency domain. The 5-DoF and 6-DoF lumped-parameter models are proposed with the suggested structure to evaluate the vibration in one direction. The other models, which are offered by a new matrix method with 6 and 15-DoF for evaluation the vibration in two (x-z) and three (x-z-y) directions are considered, respectively. The model parameters consist of masses, springs and dampers values are extracted by using genetic algorithms (GA) through the global criterion method in order to minimize the errors between experimental results and numerical data of models. For the 15-DoF matrix model, the mass parameters of each segments of human body is calculated by the formulas which are given in medical journals. The presented models in comparison with previous models were in a good agreement with experimental results. Also, for the first time in the human body biomechanical modeling, the 3-dimensional stiffness and damping matrixes are used, which can create the appropriate responses in compare with experimental and previous model results. With the help of models are obtained: i) the natural frequency of the human body ii) the biomechanical responses including: seat-to-head transmissibility, driving-point mechanical impedance and apparent mass responses of modulus and phase iii) the backrest support effect on the apparent mass responses. Finally, the 6-DoF lumped-parameter model is used in order to investigate the vibration transmissibility and transmitted accelerations for all human body segments under various road excitations by using ADAMS/CAR software. The suggested models can be widely used: i) designing, optimization and controlling of the applied vibration to the human body for vehicle suspension and seat systems ii) evaluating vehicle occupant comfort iii) estimate the ideal frequency domain of the human body.
Keywords: Biomechanical model, Automotive passenger, Vibration, Human body, Transmissibility.
