RATIONAL ALTITUDE STRUCTURE FOR PLACING THE WIND EQUIPMENT IN THE CONDITIONS OF UKRAINE
Keywords:altitude structure, mast, tower, Lira software, finite element method
Purpose. For wind observations special wind equipment is used, which should be placed at a certain height above the ground for a relatively short period of time. Such equipment can be transferred from one region to ano-ther. Therefore, the main purpose of the studies outlined in the publication is the selection and justification of the construction of a mobile altitude structure for the placement of wind equipment in the natural and climatic conditions of Ukraine. Methodology. To achieve this purpose, first we chose the type of altitude structure from the existing ones. Next, we determined the nature of the effect of natural and climatic loads on these structures in accordance with the norms of Ukraine. After this, we performed a numerical analysis of the work of altitude structures by the finite element method on the basis of the Lira software. Also, an economic evaluation of the expediency of using altitude structures of a certain type was made, taking into account the lease of the land plot for their location. Findings. According to the results of the conducted studies, it should be noted that for the conditions of Ukraine a steel tower is the most rational mobile altitude structure for placing wind equipment for a relatively small interval of time. In comparison with a steel mast of a similar height, the total cost of its installation and operation is lower. The X-cross brace for steel towers from 50 to 60 m in height is more rational than the K-brace. Herewith, its usage decreases the construction cost almost by half. Taking into account the possibility of transportation, the separation of the steel tower into assembly units of 8-10 m in length is the most effective. Originality. The authors proposed the method for estimating the economic efficiency of choosing a mobile altitude structure depending on the natural and climatic conditions of the terrain. In accordance with this method, the most rational type of altitude structure is determined taking into account its mobility. Practical value. Application of the proposed approaches and the solutions allows reducing the time required for calculations in design practice and also more reasonably approaching the choice of design solutions for altitude structures.
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