Scientific and Technical Journal

ELECTROTECHNIC AND COMPUTER SYSTEMS

ISSN Print 2221-3937
ISSN Online 2221-3805
DYNAMIC LOADS IN KINEMATIC TRANSMISSIONS WITH LIUFT AT THE OPTIMUM CONTROL OF THE MECHANISM OF TURNING
Abstract:
With the purpose of increasing the productivity of many technological processes, optimal control of an asynchronous electric drive of turning mechanisms by the criterion of speed and simultaneous damping of cargo fluctuations is considered. The law of change of the dynamic moment of the electric drive obtained with the use of Pontryagin's maximum principle ensures the damping of the load oscillations by the end of the transient process of the rotation mechanism and the minimum duration of these processes. However, this requires not smooth, but instantaneous applications of maximum torque, which leads to the greatest dynamic loads in the transmission links. Dynamic loads in kinematic gears with a clearance under the optimal control of the rotation mechanism are investigated. It is shown that when the engine is reversed, even without taking into account the play in gears, the dynamism coefficient essentially depends on the initial conditions. Processes are aggravated by the presence of gaps in the kinematic transmissions of the mechanical part of the electromechanical system. It is shown that by changing the motor torque according to an exponential law, it is possible to achieve a significant reduction in loads in kinematic gears. However, with large gaps, even under these conditions, the loads in the gears can be unacceptable. Therefore, it is desirable so to contain the mechanical part of the rotation mechanism, so that the total value of the gap in the transmissions does not exceed 1 to 1.5 rad. It is shown that taking into account viscous friction gives an additional reduction in loads, and deviation of the control method from the ideal has an insignificant effect on the quality indices of the optimal transient processes of the electromechanical system.
Authors:
Keywords
DOI
http://dx.doi.org/ 10.15276/eltecs.27.103.2018.08
References
  1. Gerasimyak, R.P., Leshchev, V.A. (2008). Analysis and Synthesis of Crane Electromechanical Systems [Analiz i sintez kranovih elektromehanicheskih system], Odessa, Ukraine, SMIL, 192 p. (In Russian).
  2. Gerasimyak, R. P., Naydenko, E. V., Togobiskiy, A. L., Leshchev, V. A. (2006). Dynamic loads with optimal control of the electric drive of the moving mechanism with suspended load[Dinamicheskie nagruzki pri optimalnom upravlenii elektroprivodom peremeshenija s podveshenim gruzom], Kiev, Ukraine Electro–technical and computer systems, Vol. 66, pp.144-146 (in Russian).
  3. Gerasimyak, R. P., Naydenko, E. V. (2010). Features of controlling electromechanical systems of turning mechanisms[Osobenosti upravlenia elektromehanicheskimi sistemami mehanizmov povorota], Harkiv, Ukraine Electro–technical and computer systems, Vol. 28, pp.270-271 (in Russian).
  4. Gerasimyak, R. P., Naydenko, E. V. (2015). Loads in kinematic transmissions of two-mass electromechanical system in braking mode[Nagruski v kinematicheskih peredachah dvuhmassovoi elektromehanicheskoi sistemi v regime tormogenia], Kiev, Ukraine Electro–technical and computer systems, Vol. 17 (93), pp.15-22 (in Russian).
  5. Naydenko, E. V. (2016). Reduction of loads in kinematic transmissions of a two-mass electromechanical system with backlash[Snijenie nagrusok v kinematicheskih peredachah dvuhmassovoi elektromehanicheskoi sistemi s luftom], Kiev, Ukraine Electro–technical and computer systems, Vol. 21 (97), pp.36-42 (in Russian).
Published:
Last download:
7 Feb 2020

[ © KarelWintersky ] [ All articles ] [ All authors ]
[ © Odessa National Polytechnic University, 2014-2018. Any use of information from the site is possible only under the condition that the source link! ]