Improved Model of a Vibrating Sieve
Maria Dragomir, Alina Ovanisof, and Roxana Alexandra Petre
Abstract Various mechanical devices use vibrations in order to produce useful
effects. Such an example can be found in vibrating sieves, used to separate certain
particles out of a mix of small seeds. The particles move on the surface of the
sieve under the action of the gravity, as well as of the effect induced by longitudinal
vibrations. During the process, the mix stratifies, the heavy and small particles tending
to accumulate in the lower layer. A simplified model of such a device was proposed
and analyzed by the first author of the present paper in a previous publication. This
model is now improved, by taking into account certain characteristics previously
neglected. The free and the forced vibrations induced by an exciter with an eccentric
rotating mass are studied. The optimal location of the exciter is determined, in order
to maximize the separation, as well as to avoid secondary adverse effects. The study
is illustrated by a numerical example based on the experimental device used in the
previous publication. Calculated values of certain quantities are compared with those
calculated on the simplified model, as well as with the measured ones. The results
can be used by mechanical engineers involved in the design of vibrating sieves.
1 Introduction
The motion generated by the vibrations of a system is used, in practice, in various
fields of activity, including agriculture and food industry. Among the use of such
motions, as described above, are the separation and sorting of the material consisting
of a mixture of seeds and impurities, as well as sorting the seeds by size, with devices
equipped with sieves acted mechanically in order to induce a relative movement of
the material with respect to the sieve.
Aspects regarding vibrating sieves were studied by various authors. Thus, numerical simulations of the process were presented in [1, 2]. A three degree of freedom
M. Dragomir · A. Ovanisof (B) · R. A. Petre
University Politehnica of Bucharest, Bucharest, Romania
e-mail: alinaovanisof@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_40
395
Maria Dragomir, Alina Ovanisof, and Roxana Alexandra Petre
Abstract Various mechanical devices use vibrations in order to produce useful
effects. Such an example can be found in vibrating sieves, used to separate certain
particles out of a mix of small seeds. The particles move on the surface of the
sieve under the action of the gravity, as well as of the effect induced by longitudinal
vibrations. During the process, the mix stratifies, the heavy and small particles tending
to accumulate in the lower layer. A simplified model of such a device was proposed
and analyzed by the first author of the present paper in a previous publication. This
model is now improved, by taking into account certain characteristics previously
neglected. The free and the forced vibrations induced by an exciter with an eccentric
rotating mass are studied. The optimal location of the exciter is determined, in order
to maximize the separation, as well as to avoid secondary adverse effects. The study
is illustrated by a numerical example based on the experimental device used in the
previous publication. Calculated values of certain quantities are compared with those
calculated on the simplified model, as well as with the measured ones. The results
can be used by mechanical engineers involved in the design of vibrating sieves.
1 Introduction
The motion generated by the vibrations of a system is used, in practice, in various
fields of activity, including agriculture and food industry. Among the use of such
motions, as described above, are the separation and sorting of the material consisting
of a mixture of seeds and impurities, as well as sorting the seeds by size, with devices
equipped with sieves acted mechanically in order to induce a relative movement of
the material with respect to the sieve.
Aspects regarding vibrating sieves were studied by various authors. Thus, numerical simulations of the process were presented in [1, 2]. A three degree of freedom
M. Dragomir · A. Ovanisof (B) · R. A. Petre
University Politehnica of Bucharest, Bucharest, Romania
e-mail: alinaovanisof@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_40
395