The Pendulum-Lever System

Recommendations for Efficiency Measuring of the Two-Stage Mechanical Oscillator by Jovan Marjanovic, M.Sc.

The goal of this work is to summarize the findings from previous papers along with some additional comments and also to answer two basic questions: how to construct an efficient Veljko Milkovic two-stage oscillator and how to measure the quotient of efficiency of the constructed oscillator.
The method which the author proposes and some other people have already proposed similar methods, solve all the above problems and doesn’t need expensive equipment for measuring of forces, velocities and accelerations.
The method proposed measures the heights of both masses on both sides of the lever, which must be locked in its upper positions by a ratchet mechanism... more

Mk 5 Input/Output Determination Through Load Cell Measurement by Ronald Pugh (Canada)

It was my intention to strain gauge Mk 5.3 to see the input and output relationship; the output to be measured between the secondary arm and the counter weight, as in a Veljko Milkovic pendulum in hammer mode.
...Therefore, 9 watts input, for 13.18 watts output = COP, 1.46
...The 9 watts was taken from the electrical input. The voltage and current were measured on the DSO 101 and the power in watts derived therefrom. I have arbitrarily taken the 9 watts for the COP calculations above. This is done to err on the plus side as I have not included the draw of the ratchet solenoids nor the draw of the electronics in these calculations. more

Recommendations for measuring the efficiency quotient in the two-stage mechanical oscillator by Jovan Marjanovic, M.Sc.

During public discussion, questions have frequently been addressed to Veljko Milkovic as to why not calculate input energy of the raised pendulum by using the simple formula for potential energy Ep = mgh. I have also found that this formula is easy to use and recommended it. However, over time, two problems using this simple formula were found...
...The method chosen by Jovan Bebic has solved both these problems. That is, to keep adding energy to the pendulum once its starting angle was in position 1 at all times. Thus the amplitude of the lever arm, as well as the output energy on the generator is constant and easy to measure. more

Calculation of energy surplus of the two-stage mechanical oscillator in the experiment with manual dynamo lamps by Jovan Bebic, M.Sc.

In this analysis energy surplus of the two-stage mechanical oscillator by Veljko Milkovic has been calculated in an experiment performed with help of manual dynamo lamps, by placing a certain number of such lamps under the lever while the oscillation of the pendulum has been maintained with exactly the same lamp and in that way input and output work have been measured (Force x Distance). ...Then we get that the efficiency of this model of two-stage mechanical oscillator is 2.8 times. Energy result - net gain of energy is 180%! more

Measuring the ratio of output and input energy of the two-stage mechanical oscillator by Jovan Bebic, M.Sc.

This analysis measures output and input energy during operation of the two-stage oscillator. Output energy was measured based on the elevation of the weight at the right arm of the lever of the two-stage mechanical oscillator, whereas input energy was measured based on the height of the initial position of the pendulum when it was out of balance. ...Therefore, ratio of energy at the output and energy at the input is 22.89. more

Re-calculation of output energy measured by Jovan Bebic by Jovan Marjanovic, M.Sc. Input energy is given to the system only once by increasing potential energy of the pendulum. It has been calculated using formula Ep = mgh for potential energy. Output energy has been calculated by measuring distances left side of the lever passed from the upper position till striking down into the pillar until pendulum stopped. Then formula Ep = mgh has been taken again with mass m2 of the lever. This is actually the problem of the calculation. ...Because input energy was 0.787 J and output was 2.56 J, performance was 3.25. more

Analysis of Movement of a System with Elastic Pendulum by Branislav Serdar, M.Sc.

Analysis of the influence of pendulum amplitude on movement of a pendulum system during sliding friction and rolling friction

Branislav Serdar, M.Sc. in mechanical engineering, has conducted his own research and expertise of Veljko Milkovic's elastic string pendulum experiment. The aim of this paper with accompanying video was to observe differences in the systems under the effect of impact forces on the metal ball of the pendulum, as well as to analyze and compare the results obtained. more

Official electric measurement by Institute for Energetics, Electronics and Telecommunications, University of Novi Sad (Serbia)

On request of Mr. Veljko Milkovic from Novi Sad, voltage, current and power provided by singlephase generator of alternating voltage (unmarked) have been measured, in the work mode for which it has been designed. During the first measurement, the generator was run by the lever that could be moved in a vertical plane. The generator was fixed (immobilized) and the force was applied in a straight line, from upwards towards down. During the second measurement, the generator was held in a hand, and the force was transferred by hand through the generator on the weight hanging on a lever and moving in a vertical plane.
The following values were acquired: the values of the measured electrical current varied between 91 mW and 228 mW (first measurement) and the values of the measured electrical current varied between 2 mW and 9 mW (second measurement). more