Vestnik Donetsk National Technical University

APPROACHES TO CREATING SIMULATION MODELS OF COMPLEX SYSTEMS WITH ELECTRIC DRIVE

2024-10-22T06:27:51+00:00

There are a large number of electromechanical systems (EMC) operating in the industry, driven by various DC or AC drives. The moments of resistance on the part of the mechanisms may have different laws of change, kinematic schemes differ significantly from each other. The EMC classification can be performed according to the type of the calculated mechanical circuit and the nature of loading. The lack of sufficient data on loading modes at the design stage leads in reality to failures under the influence of parasitic forces. Determining the causes of failure requires not only qualitative, but also quantitative assessment, which is achieved by simulation modeling, primarily the dynamic forces that arise when gaps increase. The applied nature of this study requires the use of a unified approach that allows to reduce complex computational schemes to several standard ones and to evaluate the behavior of the system.

EXPERIMENTAL SUBSTANTIATION OF THE EFFICIENCY OF TWO-END POWER SUPPLY DISCONNECTION OF THE ENGINE ELECTROTECNICAL COMPLEX OF MINE BASED ON THE USE OF AUTONOMOUS MEANS OF DETECTING ITS EMERGENCY CONDITION

2024-10-23T11:26:19+00:00

Operating conditions of engine electromechanical equipment of mine is determined by its location nonstationarity, which, in turn, makes it necessary to use of flexible cables. Mechanical damage to the supply cable is the cause of phase-to-phase short circuits and earth leakages. Overcurrent protection and leakage protection disconnect emergency point from power supply. However back-to-network power generation produced by induction motors after the protective disconnection of power supply de-energizing has occurred.

THE INSULATION CAPACITY OF THE ELECTRICAL NETWORK OF THE MINE SITE AS A FACTOR IN THE FORMATION OF CURRENT IN THE GROUNDING CIRCUIT

2024-10-23T11:53:27+00:00

The relevance of the study is justified by the need to identify the degree of influence of the insulation capacity of the cables of the mine district electrical network on the magnitude of currents in the branches of the conductivity of the grounding network

AN ELECTRICALLY SAFE MINE ASYNCHRONOUS MOTOR. JUSTIFICATION OF THE CONCEPTUAL SOLUTION

2024-10-23T12:05:33+00:00

The danger of human electric shock during the operation of industrial electrical installations is caused, in particular, by the presence of reverse EMF asynchronous motors after the power supply voltage is turned off, which determines the relevance of finding technical solutions in the field of adaptation of reverse EMF suppression means directly into the structure of an asynchronous motor.

THE SEQUENCE OF STUDYING THE ELASTIC-DAMPING PROPERTIES OF BRIDGE CRANE METAL STRUCTURES

2024-10-24T06:50:56+00:00

The paper considered the elastic-damping properties of metal structures of a foundry bridge crane with damping of vibrations after force exposure as a diagnostic sign of the operable state of this element. The results of mathematical modeling, laboratory and model experiments are presented.

ANALYSIS OF CHANGES IN THE TECHNOLOGICAL PARAMETERS OF THE VALVES OF THE GAS DISTRIBUTION MECHANISM OF THE UMZ-4216 ENGINE IN THE PROCESS OF ITS OPERATION IN DIFFICULT CONDITIONS OF URBAN PASSENGER TRANSPORTATION

2024-10-24T06:38:25+00:00

The operation of internal combustion engines on vehicles operating in modern urban traffic is characterized by unsteady operating modes. The consequence of this is a continuous change in the output parameters (torque and speed), causing an increase in wear of the mating surfaces and, as a result, a decrease in the resource of the unit. Up to 97% of the time of car operation in urban driving conditions, up to 90 ... 95% of the time when driving on dirt roads and up to 30 ... 35% of the time when driving on highways fall precisely on the unsteady mode of operation.