scholarly journals Compensation of Dynamic Loads of the Rolling Stand Electric Drive by Means of Anticipatory Speed Increase

2019 ◽  
pp. 39-46 ◽  
Author(s):  
Vadim R. Gasiyarov ◽  
Keyword(s):  
Electric Drive ◽  
Dynamic Loads ◽  
Speed Increase

Reducing dynamic loads in the mechatronic system of a rolling mill

2020 ◽  
pp. 45-48
Author(s):  
S.I. Malafeev ◽  
A.A. Malafeeva ◽  
V.I. Konyashin
Keyword(s):  
Direct Current ◽  
Electric Drive ◽  
Rolling Mill ◽  
Correction Method ◽  
System Model ◽  
Dynamic Loads ◽  
Dynamic Processes ◽  
Mechatronic System

A correction method for regulating the mechatronic system of a «DUO-300» rolling mill with a direct current electric drive is considered. The results of the study of dynamic processes in the mechatronic system with the proposed correction are presented. Keywords rolling mill, mechatronic system, model, electric drive, engine, regulator, correction. [email protected]

Starting Processes in Electric Drive of a Passenger Elevator

2021 ◽  
Vol 1 (1) ◽  
pp. 40-49
Author(s):  
S. Rachev ◽  
K. Dimitrova ◽  
D. Koeva ◽  
L. Dimitrov
Keyword(s):  
Coordinate System ◽  
Induction Motor ◽  
Electric Drive ◽  
High Speed ◽  
Induction Motors ◽  
Dynamic Loads ◽  
Design Stage ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Electric Induction

During the operation of electric induction motors used to drive passenger elevators, electro-mechanical transient processes occur, which can cause unacceptable dynamic loads and vibrations. In this regard, research is needed both at the design stage and for operating elevator systems to determine the arising impact currents and torques, in order to propose solutions for their limitation within pre-set limits. Paper deals with starting processes in a two-speed induction motor drive of a passenger elevator. The equations for the voltages of the induction motor are presented in relative units in a coordinate system rotating at a synchronous speed. The values have been obtained for the torques, the rotational frequencies and the currents when starting at a high speed and passing from high to low speed.

scholarly journals CONTROL SYSTEM OF TWO MASS ELECTROMECHANICAL SYSTEM BASED ON INDUSTRIAL CONTROLLER

2020 ◽  
Vol 33 (109) ◽  
pp. 46-53
Author(s):  
E. Naydenko ◽  
◽  
D. Zahumennov
Keyword(s):  
Electric Drive ◽  
Control Algorithm ◽  
Control Program ◽  
Suspended Load ◽  
Management Program ◽  
Dynamic Loads ◽  
Control Methods ◽  
Mechanical Vibrations ◽  
Mass System ◽  
Industrial Controller

It is possible to create a control program for a two-mass system based on an industrial micro- controller. The software implements various control methods to reduce the dynamic loads in the kinematic elements during the transients. The methods of simulating the behavior of the mechanism in different condi- tions and time intervals is described, as well as demonstration of the system operation and registration of relevant data. Numerous studies have shown that mechanical vibrations in most cases adversely affect the operation of the electric drive, causing an increase in dynamic loads, which reduces the accuracy of the mechanism, the occurrence of mechanical vibrations that create a dangerous situation. In the transients, when the suspension point of the load moves with acceleration, there is a swing of the load relative to its equilibrium position. The aim of the work is to control the mechanism of horizontal movement by an indus- trial controller, which implements the reduction of loads in the kinematic transmissions during the transi- ents, increases the speed and dampens the oscillations of the suspended load. The task is to develop a control algorithm and demonstrate the possibility of implementing the necessary control laws of the industrial con- troller. The possibility of realization of a microcontroller control of the asynchronous electric drive of the translational movement mechanism with the suspended load is shown, the control algorithm providing re- duction of the dynamic loadings in the kinematic elements is developed, and at small values of a backlash it provides speed and damping of the fluctuations suspended on a flexible thread. The management program is implemented on the basis of the industrial controller. It is possible to demonstrate the operation of the sys- tem in real time, as well as, changing the scale of time, to investigate the dynamic loads arising in the kine- matic elements of the mechanism under different conditions and control methods.

scholarly journals Computer model of electric drive of 1L100K conveying unit

2019 ◽  
Vol 134 ◽  
pp. 01012
Author(s):  
Denis Zolkin ◽  
Vadim Petrov
Keyword(s):  
Control System ◽  
Electric Drive ◽  
Ring System ◽  
Vibration Damping ◽  
Electromechanical System ◽  
Dynamic Loads ◽  
Belt Conveyor ◽  
Electric Drives ◽  
Belt Conveyors ◽  
Elastic Elements

The paper deals with the problems of vibration damping and limiting dynamic loads in the electromechanical system of a belt conveyor by means of an adjustable electric drive. A conveying unit is represented as a three-mass ring system, which corresponds to a conveying unit with cinematically closed tape. The development of the structure of the control system for electric drives of belt conveyors with limited dynamic loads in elastic elements will reduce the dynamic loads on the belt and therefore the wear of the belts. Conditions of damping of oscillations in electromechanical system of belt conveyors are defined.

scholarly journals Issues of Multi-Motor Electric Drive Dynamics through the Example of Converter Tilting Mechanism

2020 ◽  
Vol 5 (3) ◽  
pp. 253-265
Author(s):  
V. F. Borisenko ◽  
V. A. Sidorov ◽  
A. I. Zemlyansky
Keyword(s):  
Simulation Model ◽  
Electric Drive ◽  
Metallurgical Industry ◽  
Natural Oscillation ◽  
Dynamic Loads ◽  
Control Voltage ◽  
Operation Conditions ◽  
Simulink Model ◽  
Acceleration And Deceleration ◽  
Basic Oxygen Converters

Many heavy machines and mechanisms of mining and metallurgical industry, for example, basic-oxygen converters (BOCs), are equipped with multi-motor electric drive. Reducing the influence of the disadvantages characteristic of a branched multi-connected system is possible by creating control systems based on mathematical models of the considered electromechanical systems (EMS). The full mathematical model takes into account the number of EMS motors, gear backlashes, elasticity of shafting, the effect of dissipative forces, etc. Disadvantage of this approach is complexity of such models, which leads to high computational costs and time expenditure for their implementation. To analyze dynamic processes arising under acceleration and deceleration conditions of the electromechanical system of the converter tilting mechanism, it is proposed to use a simplified equivalent simulation model, which would take into account changing the EMS natural oscillation frequency for any operation conditions based on process and design features. Based on the simulation model analysis, it was concluded that it is necessary to assess mechanical loads in the system by comparing their current and basis values, as well as taking into account the damping properties of the electric drive. To reduce dynamic loads, it is proposed to form a law of changing the control voltage using an intensity generator, which reduces the risks of occurrence of elastic moments, significantly exceeding those permissible for this class of mechanisms. The results of thermal and vibration diagnostics for assessing malfunctions of key units of the converter tilting mechanism, as well as assessing the system behavior based on the Matlab Simulink model with varying shafting elasticity and normalized gear backlashes, showed significant effect of the latters on the dynamic loads.

scholarly journals Substantiation of the algorithm for controlling the adjustable electric drive of roller crusher-grinders of forage grain

2020 ◽  
Vol 21 (2) ◽  
pp. 183-198
Author(s):  
M. A. Pryshchepau ◽  
V. A. Daineko ◽  
A. M. Pryshchepava
Keyword(s):  
Electric Drive ◽  
Early Stage ◽  
Minimum Energy ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Technological Parameters ◽  
Speed Increase ◽  
Frequency Converters ◽  
Vertical Loading ◽  
Minimum Energy Consumption

In recent years, along with the traditional technology of dry grain storage and grinding before feeding, the technology of preserving crushed grain at an early stage of ripeness is widely used. These technologies do not replace each other, but objectively complement each other, that is, they exist in parallel and require appropriate equipment for their implementation. To do this, it is necessary to use universal energy-efficient equipment for crushing feed grain with a high annual load. As such equipment, it is advisable to use roller crusher-grinders with individual electric drive of the rollers. The process of crushing and grinding grain is significantly affected by the physical and mechanical properties of the grain and the design and technological parameters of roller crusher-grinders. Analysis of the strength properties of the grain shows that in order to reduce the energy intensity the process of crushing the grain must be carried out at a higher moisture content and the deformation rate should be as high as possible. When a certain circumferential speed of the rollers is reached, the process reaches both maximum performance and minimum energy consumption. The control algorithm is based on changing the speed of the rollers stepwise from a lower speed to a higher one. In this case, at each stage a metered portion of grain is crushed between the upper and lower flaps of the vertical loading shaft, and the time by which this portion will have been worked out is measured. This procedure is carried out by changing the speed from lower to higher until the speed at which crushing of the portion will take the minimum time is determined. If the technological process requires a grain grinding mode, the speed of one of the rollers increases from the optimal crushing rate. The speed increase occurs as long as the recu-peration current in the parallel-connected DC buses of the frequency converters increases.

Dynamic Analysis of Trebling-Pivot Vehicle on Undulate Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1947-1950
Author(s):  
Yuan Wen Cao ◽  
Yan Li Yi ◽  
Min Qin
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Load ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Dynamic Loads ◽  
Speed Increase ◽  
Road Surfaces ◽  
Amplitude Increase ◽  
Heavy Truck

Model of heavy truck was built with the ADAMS dynamics simulation software. Dynamic loads between the wheels and the pavement with different loads and different speeds and different road surfaces were analyzed comparatively. Results indicate that the dynamic load between the wheels and the pavement will be increased with the speed increase; the dynamic loads between the wheels and the pavement will be increased with the pavement amplitude increase; Under the same conditions, the dynamic load of fully loaded vehicle was larger than that of no-load vehicle.

Simulation of the Tooth Helix Angle Influence on the Vibration of a Single Stage Helical Gearbox

2014 ◽  
Vol 658 ◽  
pp. 83-88
Author(s):  
Zoltan Iosif Korka ◽  
Vasile Cojocaru ◽  
Calin Octavian Miclosina
Keyword(s):  
Environmental Pollution ◽  
Current Trend ◽  
Dynamic Contact ◽  
Helix Angle ◽  
Single Stage ◽  
Dynamic Loads ◽  
Speed Increase ◽  
Wide Range ◽  
A Priority

The current trend in the construction of gearboxes, regarding the speed increase, favors the increase of the dynamic loads which are accompanying the operation of these kinds of machines. The phenomena of dynamic contact like frictions, collisions and shocks which are taking place in cinematic couples, engines and mechanisms during their movement, are generating vibrations in a wide range of frequencies. Vibrations produced by gearboxes became characteristically indicators for assessing their quality. Therefore, the decrease of vibrations produced in the gear transmissions became lately a priority, being one of the combat methods in the fight against environmental pollution.

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