Перегляд за Автор "Strizhak, M. G."
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ДокументAnalysis of Various Approaches to Modeling of Dynamics of Lifting-Transport Vehicles(Science Publishing Corporation, 2018) Grigorov, O. V.; Druzhynin, E. I.; Anishchenko, G. O.; Strizhak, M. G.; Strizhak, V. V.The results of analytical and numerical modeling of dynamic characteristics of linear and non-linear mathematical models of the "trolleyload" system of bridge and container cranes are presented. KiDyM software complex is used for numerical modeling, which, based on the use of the apparatus of structural matrices and the built-in computer algebra system, allows the construction of ordinary differential equations of motion of the class of systems under consideration at the analytical level. Recommendations on the possible use of the considered mathematical models of the "trolley-load" system in various regular and forced operation modes of bridge and container cranes are given on the basis of the analysis. The ratio of the results of calculations for various design models of regular and forced operation of the bridge crane has been established. The magnitude of the distribution of the maximum values of the dynamic characteristics of motion of the container crane has been designed by calculating the forced operation mode using various mathematical models. ДокументComparing hydraulic and electromechanical drives by electric motor's power(2019) Grigorov, O. V.; Anishchenko, G. O.; Druzhynin, E. I.; Strizhak, V. V.; Strizhak, M. G.; Mаlashchenkо, V. O.The authors have made the analysis of energy consumption by positive-displacement hydraulic drive and asynchronous motor with phase rotor in the course of crane mechanisms operation at all stages of motion: acceleration, movement at nominal or intermediate speed, and deceleration. There have been determined and compared equivalent capacities per work cycle for electric and hydraulic drives of crane mechanisms depending on operating conditions group and operation time. There has been justified the decrease of rated capacity of electric motor of crane mechanisms’ hydraulic drive as compared with the case of applying asynchronous motor with phased rotor for the same mechanisms. ДокументImproving power efficiency of pneumatic logistic complex actuators through selection of a rational scheme of their control(PC Tесhnology сеntеr, 2018) Krytikov, G. A.; Strizhak, M. G.; Strizhak, V. V.The work addresses solving important problems that occur when using pneumatic actuators, namely energy saving and expanding the scope of its use by covering the zone of large inertial loads at a constant maintenance of the actuator's operability. A rational structure of the pneumatic actuator based on a change in the structure of commutation links was determined. It ensures the following advantages over a discrete actuator: – an optimal form of the transient and high braking effect in the PA which are achieved by simultaneous pressure growth in the exhaust chamber and pressure differential in the working chamber up to ensuring a constant negative pressure differential at which a constant negative acceleration during braking takes place; – in the braking phase, not only transit working capacity but also potential energy of expansion of the compressed air in the working chamber is used; – the compressed air from the braking chamber is not irrevocably transformed into thermal energy but is returned to the feed line through the opened return valve (recuperation mode is realized); – the compressed air consumption for fixing the piston in the final position is significantly reduced; – due to the minimum pressure рk in the exhaust chamber at the initial moment of the piston motion, nonproductive work of ejection of the compressed air from the exhaust chamber is substantially reduced. Thus, the complex nature of reducing nonproductive energy inputs creates an energy saving effect that makes it possible to reduce energy inputs by 4–10 times in the rational scope of use of this actuator (χ<0.2 and β<2). The engineering procedure for solving the basic problem of functional and cost analysis was demonstrated on a specific numerical example: comparison of lump sum and operational costs in making a decision on the expediency of use of the new solution in practice. ДокументNumerical simulation of the dynamics of the system "trolley – load – carrying rope" in a cable crane(РC Tесhnology сеntеr, 2018) Grigorov, O. V.; Druzhynin, E. I.; Strizhak, V. V.; Strizhak, M. G.; Anishchenko, G. O.We report results of research into patterns in the progress of dynamic processes and into emergence of dynamic loads when a trolley of the cable crane moves with a suspended load. These patterns could be subsequently taken into consideration when calculating actual cranes, in order to improve their reliability and durability, to avoid unfavorable events during motion of a freight trolley, as well as to define parameters of cranes of the new design. The dynamics of a cable crane is considered from the point of view of the interaction between elements of the system "trolley-load-carrying rope". We have improved a mathematical model for the system "trolley-load-carrying rope" by introducing three damping coefficients, each of which characterizes energy dissipation under different physical processes ‒ the motion of a trolley, a load, and the speed of a wind load. Numerical simulation was performed using the software package KiDyM, which at the analytical level allows the construction of motion equations for the systems that are described by a combination of ordinary differential equations. We established patterns of change in the normal and tangential inertial forces occurring during motion of the trolley along a curvilinear trajectory. Their character and magnitude were quantified. We determined dynamic characteristics of the system, taking into consideration the influence of the masses of a swinging load, a trolley, and the curvature of a rope. Emergency mode that occurs at a break of the traction rope was investigated, as well as the influence of wind load on the swinging of the load. We defined causes for the emergence of the reverse speed for a freight trolley, and the ways for its elimination. The influence of wind load on the angle of load deviation from the vertical was examined. ДокументTesting of hydrodynamic drive of cranes mechanisms(AGIR Publishing House, Bucharest, Romania, 2020) Grigorov, O. V.; Anishchenko, G. O.; Petrenko, N.; Strizhak, V. V.; Turchyn, O. V.; Strizhak, M. G.; Okun, A. O.; Radchenko, V.The results of researches on the cranes (bridge, tower and portal) with hydrodynamic drives of travel and slewing mechanisms are given. Recommendations for a significant increase hydraulic drives elements limit number of fatigue cycles in relation to a drive with a phase rotor are given. ДокументTesting of hydrostatic drive of cranes mechanisms(AGIR Publishing House, Bucharest, Romania, 2019) Grigorov, O. V.; Anishchenko, G. O.; Petrenko, N.; Strizhak, V. V.; Turchyn, O. V.; Strizhak, M. G.; Okun, A. O.At present, the experts of lifting, transport, construction and road equipment are tasked with significantly improving the productivity of loading and unloading operations, improving performance characteristics, increasing the durability and reliability of machines. One of the ways of solving these problems is the widespread use of hydraulic transmissions in various mechanisms of cranes, construction and road machines. The results of researches on the cranes (bridge, tower and portal) with hydrostatic drives of travel and slewing mechanisms are given. The results of testing are compared with the solutions on the computer. Recommendations for a significant increase hydrostatic drives limit number of fatigue cycles of welded joints of crane steel structures in relation to a drive with a phase rotor are given. ДокументДослідження мехатронних перетворювачів методом кореневого годографа(НТУ "ХПІ", 2011) Крутіков, Геннадій Анатолійович; Стрижак, Мар'яна Георгіївна; Krutіkov, G. A.; Strizhak, M. G.Стаття присвячена дослідженню мехатронних перетворювачів – редукційних клапанів з пропорційним електрокеруванням. За допомогою методу кореневого годографа виявляються шляхи одночасного досягнення стійкості та гарної пропускної спроможності редукційних клапанів за рахунок оптимально підібраних конструктивних параметрів.