The Influence of External Factors on Hazards in the Transport Processes of Soybean Meal

The influence of external factors on changes in the soybean meal quality features has an important meaning in the emergence of hazards during the transport processes of this cargo. Soybean meal is one of the most frequently used components of fodder mixtures. Due to its inherent properties, it is classified as special cargoes. Maintaining the quality of soybean meal during transport processes depends on storage, handling and transport conditions. The main external factor included in the study was humidity. Transport-technological quality features were distinguished: kinetic angle of repose, size of particles, bulk density, porosity. The article presents the results of research on soybean meal and its separated fractions. There was presented humidity influence on changes in significant features for this cargo. Type and range of changes in the distinguishing features of soybean meal were determined in the given stages of the transport chain under the influence of humidity. The risk was assessed in the transport processes of soybean meal. A correlation was determined between changes of individual features and water content in soybean meal changing as a result of air humidity. It was found that humidity of the ambient air in which transport processes occur and size of grain particles of soybean meal have a significant impact on changes in transport-technological quality features.

Study of the Planar Rocking-Block Dynamics With Coulomb Friction: Critical Kinetic Angles

The objective of this paper is to show, through the planar rocking block example, that kinetic angles play a fundamental role in multiple impact with friction. Even in the presence of Coulomb friction, a critical kinetic angle θcr is exhibited that allows one to split the blocks into two main classes: slender blocks with a kinetic angle larger than θcr, and flat blocks with a kinetic angle smaller than θcr. The value of θcr varies with the friction value, but it is independent of the restitution coefficient (normal dissipation). Numerical results are obtained using a multiple impact law recently introduced by the authors. Some comparisons between numerical and experimental results that validate the used model and numerical scheme are presented. However, this paper is mainly based on numerical simulations.