Influence of Eccentricity of Drive
Mechanisms and Sieve Vibrations
on the Quality of Seed Separation
Constantin Popa, Adrian Costache, Alina Ovanisof,
and Roxana Alexandra Petre
Abstract In this paper, a theoretical and experimental study on the mechanical
separation of seeds on the windrows is carried out. First, a study on the influence
of vibrations on some quality indices of seed separation is carried out, and next to
the kinematic of the drive mechanism (eccentric slider-crank) of the planar sieves,
which is the active organ of the windrow, is analyzed. Next, the influence of the
eccentricity of the crank mechanism was determined, on the seed quality indices of
the first-quality and of the second-quality of the initial seed mass, for the wheat and
barley seeds, respectively. It can be noticed that in the case of normal vibrations, as
well as the reduced eccentricity of the sowing mechanism, the separation indices for
the first and the second-quality seeds are higher than for the classical mechanisms.
Correlation coefficients have very high values, which shows that the two curves,
theoretical and measured, are very close.
1 Introduction
Seeds cleaning and sorting is an important phase in the conditioning of agricultural
products.
In the paper [2], C˘ as˘ androiu and Enescu studied the elasticity and vibrations of
planar sieves, analyzing the separation block with kinematic excitation, the criteria
for the selection of the elastic supports, determining the eigenfrequencies of the
system, the degree of balance of forces due to elasticity, fatigue and buckling and
the safety coefficients. The authors established the optimal construction solution.
In the article [6] Ion and Gherghe studied vibrocentrifuges for separation, as well
as differential equations of seeds movement.
Dziki and Laskowsky study, in the paper [5], the physical properties and characteristics of wheat seeds prior to primary conditioning operations (cleaning and
C. Popa (B) · A. Costache · A. Ovanisof · R. A. Petre
University Politehnica of Bucharest, Bucharest, Romania
e-mail: costel_popa_2004@yahoo.com
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_51
505
Mechanisms and Sieve Vibrations
on the Quality of Seed Separation
Constantin Popa, Adrian Costache, Alina Ovanisof,
and Roxana Alexandra Petre
Abstract In this paper, a theoretical and experimental study on the mechanical
separation of seeds on the windrows is carried out. First, a study on the influence
of vibrations on some quality indices of seed separation is carried out, and next to
the kinematic of the drive mechanism (eccentric slider-crank) of the planar sieves,
which is the active organ of the windrow, is analyzed. Next, the influence of the
eccentricity of the crank mechanism was determined, on the seed quality indices of
the first-quality and of the second-quality of the initial seed mass, for the wheat and
barley seeds, respectively. It can be noticed that in the case of normal vibrations, as
well as the reduced eccentricity of the sowing mechanism, the separation indices for
the first and the second-quality seeds are higher than for the classical mechanisms.
Correlation coefficients have very high values, which shows that the two curves,
theoretical and measured, are very close.
1 Introduction
Seeds cleaning and sorting is an important phase in the conditioning of agricultural
products.
In the paper [2], C˘ as˘ androiu and Enescu studied the elasticity and vibrations of
planar sieves, analyzing the separation block with kinematic excitation, the criteria
for the selection of the elastic supports, determining the eigenfrequencies of the
system, the degree of balance of forces due to elasticity, fatigue and buckling and
the safety coefficients. The authors established the optimal construction solution.
In the article [6] Ion and Gherghe studied vibrocentrifuges for separation, as well
as differential equations of seeds movement.
Dziki and Laskowsky study, in the paper [5], the physical properties and characteristics of wheat seeds prior to primary conditioning operations (cleaning and
C. Popa (B) · A. Costache · A. Ovanisof · R. A. Petre
University Politehnica of Bucharest, Bucharest, Romania
e-mail: costel_popa_2004@yahoo.com
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_51
505