Коval A. Definition of the conditions assuring the course stability of the multipurpose earth-moving machine

Object of research - operating condition of the multipurpose track-laying earth-moving machine that works with maximal productivity in the mode of radial-translational approach of the working organ. Goal of thesis work: to design the multipurpose earth-moving machines (MEM) with sufficient course stability, which are able to produce excavations of various width in the ground without structural alteration of the implement. Research methods: methods of expert evaluation and general system theory were used to justify the selection of factors which influence the power load; scaling theory methods and physical modeling of the working processes - for the working implement; strain-measuring methods - for investigation of the power load of the working implements physical model; methods of mathematical statistics and regression analysis - for experimental data processing; analysis and synthesis - for designing new constructional-technological solutions for practical implementation of the theoretical and experimental results. Theoretical and practical results: consistent patterns in changes of the external load which influence the working implement of the machine in the excavation process have been determined; mathematical model for the determination of the course stability of multipurpose earth-moving machine has been justified and designed; the influence of the working implements subframe deflection shift duration on the values of load power parameters of the machine and it's course stability; the machines course stability increase by 26-27% is achieved by installation of additional slide shoes on the hull back of the tractive unit; decease of sidemount inertia loading is ensured by the improvement of lateral motion of the working implements links hydraulic circuit. Scientific novelty: the novel consistent patterns in changes of the external load which influence the multipurpose earth-moving machine which works in the mode of radial-translational approach of the working organ in the process of various width excavations digging have been determined; consistent patterns of the course stability coefficient change under conditions of alterating cyclic fluctuating non-coplanar load being applied to the hull back of the machine were obtained; mathematical model for multipurpose track-laying earth-moving machine with rotary working organ course stability determination has been created; corrective coefficients were introduced into the mathematical patterns for earth digging with (MEM) rotor resistance components; rotary working implement motion scheme in the excavating face had been improved. Extend of the implementation: the calculation of the primary tractive unite power load and improvement of the hydraulic circuit are implemented in the machine (MPRG-1М) which is being produced commercially by SRTC "Rотоr"; economic effect of research results implementation is 790 510 UAH per year per one machine. Area of utilization: performing of earth-moving works to produce long excavations of various width and purpose.