Research Article Open Access

Kinematics of a Mechanism with a Triad

Relly Victoria Virgil Petrescu1, Raffaella Aversa2, Taher M. Abu-Lebdeh3, Antonio Apicella2 and Florian Ion Tiberiu Petrescu1
  • 1 Bucharest Polytechnic University, Romania
  • 2 Second University of Naples, Italy
  • 3 North Carolina A and T State University, United States


The Assuric Structural Groups are the most well-known classification and modulation used in machine and machine theory, and even though other modular classifications adapted to robots have emerged today, they still remain a reference classification in industrial mechanics and engineering. Diada in the mechanics can be studied similarly to the diode in the electronics, the triad is studied in the theory of machine and robot mechanisms similar to triode (or transistor) study in electronics. Further, the theory of the mechanisms is studying: tetrad, pentad ... but it cannot go further than for a 12th-order structural group because the efficiency of mechanisms using such very large groups is very small and such a mechanism can be blocked in operation. If the similarity between the mechanisms and the electronics is correct up to the 5-6th class, the larger ones are of no use, the advantages of the electronics being that it can also function in the large or very large group with high yields, without blockages, which is why the integrated circuits and electronic chips were born. The present work is intended presenting a triad kinematics general used only with the kinematic couplings rotational (C5), because such approaches are rare in the area, although triad is a structured group Assuric often used. The calculation method presented is an analytical one.

American Journal of Engineering and Applied Sciences
Volume 11 No. 1, 2018, 297-308


Submitted On: 25 February 2018 Published On: 2 March 2018

How to Cite: Petrescu, R. V. V., Aversa, R., Abu-Lebdeh, T. M., Apicella, A. & Petrescu, F. I. T. (2018). Kinematics of a Mechanism with a Triad. American Journal of Engineering and Applied Sciences, 11(1), 297-308.

  • 2 Citations



  • Mechanisms
  • Robots
  • Mechatronics
  • Structural Groups
  • Dyad
  • Triad
  • Kinematics
  • Triad Kinematics
  • An Analytical Method