Improvement of the method of the definition of loads for bridge-type cranes with taking into account many physical phenomena accompanying the movement of cranes with skewing. Methods of research: methods of theoretical mechanics, building mechanics, theories of contact-friction phenomena, methods of electronic tables environment, methods of digital strain gauging with remote data transmission to a computer, statistical analysis, regression analysis, programming. Theoretical and practical results: improvement of the methods of determining the loads from skewing, accompanying the movement of bridge-type cranes, with the expansion of the consideration of parameters characterizing the process, which provides improved accuracy of calculations. Scientific novelty: an advanced mathematical model of movement of a bridge crane in conditions close to the real ones is proposed, which, unlike existing ones, is constructed on a modular basis in the MS Excel environment and includes modules of longitudinal motion, transverse motion and elastic bridge, the research of which is performed continuously and cyclically to the stop of the crane, and some of the resulting data of the next module can be used as output for the previous module; for the first time, for studying the movement of the crane, it is possible to change the composition of the output and result data, to connect additional functions within a single mathematical model, which is of fundamental importance for such structurally complex and diverse objects as a crane; the mathematical model for the first time allowed to investigate all phases of crane movement: acceleration, steady movement, braking. At the same time, accumulation of a considerable volume of the resulting data is provided for further analysis using mathematical statistics methods; improved coefficients of the formula for determining the maximum values of the coefficient of transverse elastic wheel slide along the rail are proposed; after an experimental verification of the correctness of the mathematical model and the program for its study, an advanced method for calculating shear loads, based on the use of the above-mentioned model and program, is proposed. Implementation level: the results of work were implemented at LLC "PTCI "UKRKRANENERGO" and LLC "Kharkov plant of lifting and transport equipment", in the educational process of the department "Lifting-transport machines and equipment" NTU "KhPI" within the special disciplines: "Metal structures of PTM", "Load-lifting machines", "Processes modeling in branch mechanical engineering", "Computer technologies in mechanical engineering". Area of application: handling machinery branch, educational process.
