A stability control system is developed for a self-propelled crane in dynamic loading. The simulation of crane operation takes account of the flexural deformation of the elements and the operation of the hydraulic drive, along with interactive control. The simulation is based on the integration of Matlab Simulink, Fuzzy Logic Toolbox, and SolidWorks CAD 3D modeling software.
The issues of numerical modeling of hydrodynamic resistance of the impeller for mixing slurry mixtures in the production of cement compositions are considered. Mathematical models based on the finite element method to analyze the hydrodynamic processes occurring in the mixing of cement-containing mixtures are developed. The influence of rotor design on the value of torque power on the impeller shaft has been investigated. It is established that the most acceptable option is a vane design that creates a good turbulence of the fluid medium in almost the entire volume of the process equipment, contributing to high-quality hydration of cement composites. Optimized power of the drive by the criterion of hydraulic resistance and the number of revolutions of the impeller.
Objective: To evaluate the infl uence of the parameters of current collectors of high-speed and very high-speed trains on the value of aerodynamic resistance. To study the effect of airfl ow on a pantograph aerodynamic device using SolidWorks software. Methods: A comparison of the obtained values of aerodynamic air resistance with those that were produced earlier is carried out. Results: By means of aerodynamic device, it is possible to reduce the speed of the air fl ow effecting the pantograph, to reduce the values of aerodynamic resistance and energy consumption, to extend the service life of current collectors. Practical importance: The proposed design can improve the current collection, which will reduce the load on the overhead line and the pantograph slide, and reduce the energy consumption of electric rolling stock.
A system for monitoring and controlling the stability of a self-propelled jib crane under dynamic loading is developed. Simulation modeling is considered taking into account the bending deformation of the elements and the operation of the hydraulic drive system of the lifting crane in combination with an interactive program control. Simulation modeling is based on the integration of Simulink and Fuzzy Logic Toolbox packages, Matlab software and SolidWorks 3D CAD system. Keywords self-propelled jib crane, dynamic loading, control system, stability, numerical simulation. yan-roos@yandex.ru; Schan-di@mail.ru
Nowadays, self-propelled jib cranes equipped with telescopic jib equipment are widely used in construction, loading, unloading and installation works. Accidents of self-propelled jib cranes caused by a sudden break of a cargo rope, as well as spontaneous unloading of cargo, can be attributed to the main causes of accidents of hoisting cranes. This reason can be considered as one of the most dangerous, since sudden release of the load is characterized by unpredictability, independence from the skill of the operator and the transience of the impact. The aim of the work is to study the loading of telescopic boom equipment during sudden load removal and to propose measures to prevent or reduce the consequences of accidents caused by this type of loading. The railway crane “Sokol 80.01M” was selected as the object of study. The method of numerical experiment, carried out in the module of complex dynamic and kinematic analysis of SolidWorks Motion mechanisms was used as a research method. As a result of numerical simulation of instantaneous load removal, balancing of the telescopic boom on the sliding plates and shock interactions of the boom sections were established. The following parameters were determined: the time dependence of the sliding support reactions, the magnitude of shock interactions, and the time dependence of the boom head vibrations. It is proposed to use on a self-propelled jib cranes the “Method to increase the safety and security system of a jib crane”, which, in addition to protecting the crane from overload and from collisions of its boom or load-lifting body with various obstacles (coordinate protection), due to the presence of pyro-cartridges and their control subsystem, ensure the prevention of accidents in the event of a sudden removal of the load from the boom, as well as the protection of the hoisting machine when exposed to random external factors, damage reduction with irreversible loss of stability of the crane. The most rational parameters of the emergency power device for boom equipment were established: the time of action of the squib; the action coefficient of the squibs, the initial force of the squibs, the charge force of the emergency power device on the boom equipment.
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