Influence of Eccentricity of Drive Mechanisms …
513
approximated by the second-order polynomial function y = ax
2
+ bx + c, where
coefficients a, b, c are real and non-zero.
The correlation coefficients have very high values, from which it follows that the
two curves, real and theoretical, are very close.
The variations of the amplitude of the signal with the time and with the oscillation frequency, for seed accelerations, are presented in Fig. 2. The variations of the
amplitude of the signal with the time and with the oscillation frequency, for seed
velocities, are presented in Fig. 3. The variations of the amplitude of the signal with
the time and with the oscillation frequency, for seed displacements, are presented in
Fig. 4.
Therefore, the trajectories of the elements of the eccentric slider-crank mechanisms are trajectories of relative movements, trajectories of transport movements,
and trajectories of absolute movements.
5 Conclusions
The variations of the amplitudes of the signal with respect to the time, given by the
sensitive element of the vibration transducer, as well as the variations of the same
amplitudes with respect to the frequency are random and are given by the graphical
representations in Figs. 2, 3 and 4.
The seeds separation is better when the amplitude of sieve vibrations is situated
in a certain range of values.
The variations in the qualitative working and exploitation indices in the separation
of wheat and barley seeds depending on the eccentricities of the drive mechanisms
are shown in Figs. 6 and 7; respectively.
Both seeds of the first-quality and the second-quality seeds are optimally separated
for the values of the eccentricity of the sieves drive mechanism of approximately
10 mm.
References
1. O. Antonescu, P. Antonescu, Mechanism and Machine Science: Course Book (Politehnica
Press Publishing House, Bucharest, 2016)
2. T. C˘ as˘ androiu, N. Enescu, Some issues concerning the elastic elements of the separation and
transport systems, vibrators used in agricultural machinery. Constr. Mach. 35(7) (1983)
3. V. Chiroiu, T. Sireteanu, Topics in Applied Mechanics, vol. 1 (Romanian Academy Publishing
House, Bucharest, 2003)
4. V. Chiroiu, T. Sireteanu, Topics in Applied Mechanics, vol. 2 (Romanian Academy Publishing
House, Bucharest, 2004)
5. D. Dziki, J. Laskowsky, Wheat seeds physical properties and milling process. Acta Agrophysica
6(1), 59–71 (2005)
6. E.E. Ion, G. Gherghe, Vibrations centrifugation of cereal mixtures. META (Theoretical and
Applied Mechanics Magazine), 3rd year, number 2, (5), pp. 55–58 (2002). (in Romanian)
513
approximated by the second-order polynomial function y = ax
2
+ bx + c, where
coefficients a, b, c are real and non-zero.
The correlation coefficients have very high values, from which it follows that the
two curves, real and theoretical, are very close.
The variations of the amplitude of the signal with the time and with the oscillation frequency, for seed accelerations, are presented in Fig. 2. The variations of the
amplitude of the signal with the time and with the oscillation frequency, for seed
velocities, are presented in Fig. 3. The variations of the amplitude of the signal with
the time and with the oscillation frequency, for seed displacements, are presented in
Fig. 4.
Therefore, the trajectories of the elements of the eccentric slider-crank mechanisms are trajectories of relative movements, trajectories of transport movements,
and trajectories of absolute movements.
5 Conclusions
The variations of the amplitudes of the signal with respect to the time, given by the
sensitive element of the vibration transducer, as well as the variations of the same
amplitudes with respect to the frequency are random and are given by the graphical
representations in Figs. 2, 3 and 4.
The seeds separation is better when the amplitude of sieve vibrations is situated
in a certain range of values.
The variations in the qualitative working and exploitation indices in the separation
of wheat and barley seeds depending on the eccentricities of the drive mechanisms
are shown in Figs. 6 and 7; respectively.
Both seeds of the first-quality and the second-quality seeds are optimally separated
for the values of the eccentricity of the sieves drive mechanism of approximately
10 mm.
References
1. O. Antonescu, P. Antonescu, Mechanism and Machine Science: Course Book (Politehnica
Press Publishing House, Bucharest, 2016)
2. T. C˘ as˘ androiu, N. Enescu, Some issues concerning the elastic elements of the separation and
transport systems, vibrators used in agricultural machinery. Constr. Mach. 35(7) (1983)
3. V. Chiroiu, T. Sireteanu, Topics in Applied Mechanics, vol. 1 (Romanian Academy Publishing
House, Bucharest, 2003)
4. V. Chiroiu, T. Sireteanu, Topics in Applied Mechanics, vol. 2 (Romanian Academy Publishing
House, Bucharest, 2004)
5. D. Dziki, J. Laskowsky, Wheat seeds physical properties and milling process. Acta Agrophysica
6(1), 59–71 (2005)
6. E.E. Ion, G. Gherghe, Vibrations centrifugation of cereal mixtures. META (Theoretical and
Applied Mechanics Magazine), 3rd year, number 2, (5), pp. 55–58 (2002). (in Romanian)