Academician Veljko Milković's two-stage mechanical oscillator is being researched all over the world. Every year, several scientific papers are published around the world dealing with the application of this invention, and many of these papers are research related to the application of this oscillator to hand-operated water pumps. The following scientific paper was published in Poland, at the University of Technology in the city of Łódź
In this paper, the authors Godiya Yakubu, Paweł Olejnik and Jan Awrejcewicz conduct simulations, mathematical modeling and analysis of a hand-operated water pump with variable pendulum length. The introductory part states:
The pendulum, lever, and piston assembly are modeled by a separate dynamical system and then joined into the many degrees-of-freedom dynamical systems. The present work includes friction while studying the system dynamics and then simulated to verify the system’s harmonic response. The study showed the effect of the pendulum length variability on the whole system’s performance. The vertically excited parametric pendulum with variable length in the system is established, giving faster and longer oscillations than the pendulum with constant length. Hence, more and richer dynamics are achieved.
The presented work is practical and valuable because it shows the most responsible mechanism for obtaining the minimum effort to swing the pendulum as well as provides a methodology that guarantees relatively fast and long-lasting oscillations, as stated in the problem definition below. First, the three-dimensional model is introduced. Next, the components are listed, stating the functions of each part of the system. Finally, the system’s working principle is supported by mathematical modeling, results of numerical simulations covered by essential conclusions
The references of this paper include several previously published scientific research papers dealing with the research of a two-stage mechanical oscillator applied to a piston water pump. These international papers can be found on our website here..