PhD Department of fire tactics and rescue operations* E. S l e p u z h n i k o v PhD Department of special chemistry and chemical technology* A. N i k o r c h u k

The aim of research is to substantiate the rational design of the travel wheel based on the determination of the dynamic forces arising from the movement of the freight carriage and the crane bridge. The research methodology is based on analytical methods for studying dynamic forces in the mechanism of movement of the cargo carriage of an overhead crane. The obtained solution of the three-mass dynamic scheme of the movement of the freight carriage. To verify the theoretical data obtained, an experiment was carried out on an overhead crane with a lifting capacity of 5 , span of 22.5 m, lifting height of 8 m, operating mode of 7 K. The study of the vibration state was carried out on the crane beam in the middle of the span, on the axis of the driven wheel of the crane trolley with an elastic insert and on the axis of the drive wheel of the crane trolley of a conventional design. Crane wheels are the fastest wearing parts of a crane. A decrease in their durability leads to an increase in repair costs and crane downtime. Therefore, increasing the durability of crane travel wheels is an urgent task of modern crane construction. All designs of travel wheels are quite rigid and do not perceive shocks and distortions arising from the deviation of the rail track from the recommended values and lead to significant wear of the flanges and rails. The analysis of the obtained solutions showed that when using a travel wheel with an elastic insert, the dynamic factors during the movement of the freight carriage decrease. Dependences are obtained for determining the dynamic forces arising from the movement of the travel crane wheel, taking into account the rigidity of the elastic ring, which is installed in the travel wheel. The analysis of the regularities of the formation of vibration signs at different points of the overhead crane structure is carried out. The proposed design and calculation method for a travel wheel with an elastic insert improves its operational reliability

No abstract

Studies of the response to nuclear emergencies with the release of gaseous and dispersed radioactive substances into the atmosphere allowed us to develop a procedure for the practical implementation of this method. The emergency response method is aimed at depositing hazardous radioactive substances from the atmosphere that enter the atmosphere during man-made accidents at nuclear power plants and other facilities for the storage and processing of radioactive materials. The developed procedure with the proposed algorithm of actions operates within the framework of a unified state system of civil protection. The presented procedure allows solving three main tasks on the elimination of emergency consequences: monitoring of the affected area, taking effective management decisions and direct influence on the affected area. The basis for making effective management decisions is to predict the dynamics of radioactively contaminated areas, predict the intensity of precipitation with various methods of artificial deposition and predict the effectiveness of deposition effects on the dynamics of changes in contaminated areas. In order to expand the capabilities of available methods for predicting contaminated areas, their modification has been proposed taking into account deposition features. The use of this procedure allows minimizing the scale of major emergencies at regional and state levels. Due to the use of artificial deposition methods, as provided for in the procedure, there is the possibility of depositing dangerous radioactive substances from the atmosphere from a height of several kilometers, which cannot be implemented by other known methods. The developed algorithm of actions and the procedure for implementing the emergency response method by artificially initiated deposition are the basis for the development of a procedure for practical emergency rescue units during emergency response at regional and state levels. Thus, there is a reason to believe that the use of the proposed procedure will improve the efficiency of response to man-made emergency with the release of hazardous radioactive substances to the atmosphere.

No abstract