In this paper, we have proposed a method for simulating the car-entering movement for vehicles of variable dimensions, using a digital human model with a head, a trunk, a pelvis and lower limbs. This method modifies the experimental joint angles; identifies and characterises the strategies and the sub-strategies used for the car-entering movement; simulates the trajectories of the feet, hips, L5 (5th lumbar vertebra) and vertex (i.e., the distal limit of the head) on a new vehicle and computes the joint angles and pelvis orientation that will best allow these simulated trajectories to be followed. To obtain the data necessary to test the applicability of our method, an experimental device, consisting of a Vicon 3D motion capture system and 2 vehicles, was set up. The car-entering movements of 33 subjects for the small vehicle and 37 subjects for the minivan were entered into the movement database used for the study. These subjects were primarily over 65 years of age and had a hip or knee prosthesis. Two simulations were performed. The first simulated the car-entering movement of a subject for a small vehicle from the information extracted from the car-entering movement performed by the same subject on the same small vehicle during our experiment. The simulation results demonstrated very strong correlations between the modified experimental joint angles and the simulated angles. Although these results were predictable, it was nevertheless important to verify this case to validate the digital estimates. The second simulation tried to simulate the car-entering movement of a subject for the minivan vehicle from the information extracted from the car-entering movement performed by the same subject on the small vehicle during our experiment. The results, which compare the modified experimental and simulated joint angles, were not as good as the results from the first simulation. In general, these results show that the pelvis has a relatively poor spatial orientation the flexion/extension of the trunk is unsatisfactory. The results will probably continue to deteriorate as the body segments become closer to the feet. Nevertheless, the simulated car-entering movement is equivalent to the sub-strategy that was adopted by the subject for the minivan during the experiments.


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    Title :

    A method for simulating the car-entering movement for variably dimensioned vehicles


    Additional title:

    Simulationsverfahren zum Einsteigen bei Fahrzeugen mit variablen Dimensionen


    Contributors:

    Published in:

    Publication date :

    2011


    Size :

    22 Seiten, 7 Bilder, 7 Tabellen, 27 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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