THE KINETICS OF THE SILO'S WALLS DURING THE FLOW OF A BULK MATERIAL

Both static pressure and dynamic pressure act on the silo’s walls. The static pressure is usually regular and can be determined on the basis of the material specifications and the relevant test results. The dynamic pressure can be more complex. It can have the form of pulse loads generated by the collapse of stored material archings, a nonuniform horizontal pressure stemming from the physical properties of the material, and variable pressures produced by, i.a., the energy generated by the friction of the flowing material against the silo walls. The latter factor induces vibrations which can be classified as self-excited vibrations (self-oscillations). This paper presents a mathematical model for describing the displacement of the silo walls dynamically loaded with a material flowing in the silo as it is emptied. The considerations are based on the results of the research conducted for several decades by Professor Augustyn Borcz’s team at Wrocław University of Science and Technology