TRIZ method introduced to the calculation field

This paper deals with determining the global mobility of mechanisms using the TRIZ (Theory of Solving Inventive Problems) method. We present the formulae for a quick calculation of the global mobility and the signification of the notion ‘mobility number’ for mechanisms. This study underlines that by using this method it isn’t necessary to eliminate the passive elements, the passive limbs of parallel robots and the symmetry influence, from the calculus of mobility of mechanisms. Only the passive degrees of freedom in each joint that do not change the movement of the next element which must be assembled in an open chain have to be eliminated. We testify to the correctness of the new procedure by giving some examples.