Study of mass motion on vibrating device: Design and process simulation.

The simulation of mass motion using a vibrating device that was laboratory designed was the main idea of the work. The construction of an experimental vibrating device and the associated measuring station along with the measurement of dynamic properties of the vibrating device depending on preselected input parameters of the device of bulk material on this experimental model is presented. The simulation of the general behavior of particles on an experimental vibrating device at rotational frequencies of 20 Hz, 25 Hz and 35 Hz, and the rotation of contact vibrators at 30°, 45° and 75° by mass flow modeling using software ROCKY DEM is done. It was observed that the particles were moving at the fastest speed at 45° and at 35 Hz and that the top layers fall to the bottom especially at higher rotational frequencies, which may ultimately cause aeration of the particulate matter, thus reducing the angle of internal friction of the bulk material.Web of Science20236380637

Signifikantní zatěžující síly skladovacích systémů partikulárních látek

PrezenčníNeuvedenoNeuveden

Problematika dopravy a skladování sypkých hmot s úhlem vnitřního tření pod 30°

Import 19/11/2007Prezenční342 - Institut doprav

Optimizing of the food process handling conveyor

Tento příspěvek vznikl za podpory projektu Studentské grantové soutěže SP2019/101 Věda a výzkum v oblasti dopravy-dopravní simulace, adhezní modely, skladovací procesy.The food industry is a specific industrial area with high demands on the use of materials with harmless and hygienic standards. The Institute of Transport, Faculty of Mechanical Engineering VŠB-TU Ostrava cooperates with industrial practice with the aim of creating practically focused assigments of bachelor and master theses. The thesis was created with company Htech CZ s.r.o. cooperation with the aim of optimizing the handling conveyor in the given section of the food process. Selected and verified design was made by the company and verified in practice

Fracture energy of selected brittle silicates

In this research, the specific fracture energy of almandine, zircon and periclase (MgO) are presented. The materials measured were in powder form during the measurement. A method of crushing the materials using a hydraulic press was used, followed by statistical analysis of the change in the surface of the powder. Values were taken from particle size measurements performed by a laser analyzer for the specific surface area calculation. Additionally, the surface energy was calculated for periclase based on these measured values in order to evaluate whether the measurement was valid in comparison to the measured values specified by other authors. The dependency of specific fracture energy on crushing speed and environment in which the powder was crushed (air or water) was also analyzed.Web of Science55436135

Particle characterization of nanoparticle materials in water jet mill device

Certain optical parameters of nano and micro-structured particles of silica were adjusted and the measurement of the particle size distribution was obtained by using the Mastersizer 2000 device. The optical method process may be used by looking for unique refractive and absorption index of investigated particles. Optical properties (i.e., refractive index) and absorption index of the silicon particles have been found and related to inter-particle silicon bindings in the form of Hamaker constants. For the optical properties, calculations using the Mastersizer 2000 Mie Scattering solutions representing the electric and magnetic induction (i.e., silica's permeability and permittivity from Maxwell's equations) were employed. The silicon nanoparticles were prepared by the water jet mill technology and the research has revealed that the silicon particles were detected in the substance as nanoparticles characterized by the silica optical parameters

Strength analysis and optimization of welding robot mechanism in emergency stop state

The contribution deals with the strength analysis and optimization of the welding robot mechanism in emergency stop state. The common operational positioning of the welding robot is characterized by smooth course of speeds in the time. The resulting load does not differ significantly from the static loading. However the safety requirements given by the norm require the ability of emergency stop function. Since the course of speed in time is rather steep the higher values of acceleration and thus higher excitation force is expected. The dynamical simulation performed describes the response of the robot mechanism in the form of stress course in time, quantifies the peak values of the stress caused by the dynamical component of loading and highlights the potential risks associated with this phenomenon

Investigation of geometric properties of modified titanium white by fluidisation for use in the process of transport, handling, processing and storage

The present article deals with investigation of geometric properties of surface modified titanium white with the help of silica oxide by various methods of shape and size identification of clusters made by processing by fluidisation. For the purpose of the investigation of geometric properties the artificially made titanium oxide (titanium white) was processed by fluidisation with a defined percentage of silica oxide additive. The selected additive was represented by hydrophilic pyrogenic silica (micronised silica oxide), known under commercial name Aerosil 200, Aerosil R972 and hydrophilic pyrogenic metal oxide Aeroxide P25. The investigation began by image acquisition of the individual additives and the titanium white with scanning electron microscope and continued by investigation of clusters created by fluidisation in a vertical fluidisation cell using state-of-the-art methods of particle size identification analysis. The research was oriented toward the area of mutual impact of particles in the titanium white clusters with particles of additives.Web of Science1953001299