Vynohradov V. Methodology for calculating the rational parameters of mast systems using the sensitivity analysis and optimization methods

The object of study is the stress-strain state of mast systems on extensions cables with rational parameters. The purpose and objectives of the research are to improve the methods of calculation of mast structures and to develop recommendations for the selection of rational parameters of mast systems on the basis of the mathematical method of sensitivity analysis and optimization. Research methods and equipment. Analytical and numerical methods of mechanics of a deformed solid body, including the finite element method, are used in the work. The main research method is a mathematical method of sensitivity analysis and optimization. An experimental study of the mast section model was performed using the method of static loading using automated calculation systems based on modern technical and information support. To measure the displacements of the mast section during experimental tests, clock-type indicators IН-10 were used. Theoretical significance of the obtained results: - on the basis of one-dimensional model the process of calculating the optimal characteristics of multidimensional models for the use of the method of sensitivity analysis is built; - the approach to the decision of a problem of management of a spectrum of natural frequencies of bending oscillations of masts on extensions with use of the device of a method of the analysis of sensitivity is offered; - developed a set of programs for the implementation of the proposed method of rationalization of mast structures on the PC; - new results are obtained regarding the choice of geometric parameters of mobile communication masts using the theory of optimization. Received further development: - approach to control of values of the first and second frequencies of natural oscillations of a mast on cable extensions on the basis of a method of the analysis of sensitivity; - experimental data on the use of the rod model of the mast section instead of the spatial structure; - method of determining the rational parameters of mast systems due to the redistribution of material using the theory of optimization. The practical significance of the obtained results lies in the development of methods for building design models of masts on cable extensions and its successful implementation at the stages of design, construction, reconstruction of the considered structures. The main results of the study were implemented during the construction of the base station at the address: Luhansk region, Severodonetsk. The design of the mast system, streamlined by this method, provided an economic effect within 10% of similar masts built according to the standard solution. The scope of use is the operation of basic mobile telecomunication stations.