“…Some motion tracking control schemes can be found in the literature for nonholonomic constraint mechanical systems [3,4,9,43] in which the complex dynamics of the entire mechanical system are assumed to be exactly known. Moreover, various robust and adaptive control schemes have already been carried out to address control design for perturbative nonholonomic mechanical systems [2,10,16,17,20,30]. During the development of these classical robust/adaptive control algorithms, the use of a regressor matrix has become quite popular in the design of adaptive control algorithms, and the implementation of the developed control schemes always requires precise knowledge of the structure of the entire mechanical dynamic model.…”