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The authors acknowledge the financial support of the National Science Centre in Krakow to the research project funded in the “POLONEZ BIS 2” call No. 2022/45/P/ST8/02312 entitled Numerical-experimental analysis of a sieve holes’ shape and arrangement effect on the degree. POLONEZ BIS is operated by the Centre on the basis of the Grant Agreement No. 945339 concluded with the European Research Executive Agency
The application of cylindrical perforated sifting surfaces with volumetric riffles in vibrocentrifugal machines for
separation of loose materials requires the development of methodologies for studying the dynamics of particles
in working zones and ensuring structural reliability. The analogy with hydrodynamic models became the basis
for mathematical modeling of the movement of loose materials along the sifting surface. The movement of loose
material was considered as the movement of a pseudo-liquid medium, which has characteristic parameters such as
viscosity, density, porosity, and layer height. The use of volumetric riffle-activators on a perforated sifting surface
intensifies the processes of loose medium separating, however, it requires studying their dynamics and reliability
of structures. The obtained mathematical expressions for the velocity and flow rate of the medium take into ac-
count the design and kinematic parameters of sifting surface, riffle-activators and properties of loose material. To
test the obtained mathematical expressions, studies were conducted on sifting surfaces with rectangular holes with
riffles of various shapes and sizes. The study also analysed the degree of properties influence of loose materials,
using corn and sunflower seed mixtures as an example, on their dynamic indicators. The dynamics of loose me-
dium on cylindrical perforated surfaces with riffle-activators is one of the main tasks for calculating the productiv-
ity and quality of the sieve separation process. Obtained appropriate dependencies of technological indicators of
perforated vibrating surfaces allowed to establish ranges of variation of their rational ranges of design parameters,
including the parameters of riffle-activators. The natural frequencies and shapes have been determined on the basis
of numerical and experimental methods, which make it possible to assess the possibility of resonant modes during
the operation of cylindrical sifting surfaces. Oscillations depending on its structural and kinematic parameters and
properties of loose materials have been studied, which will ensure the reliability and technological durability of
the structure of riffled sifting surfaces.
