scholarly journals MODELLING OF ELECTROMECHANICAL DRIVE SYSTEMS WITH THE USE OF MODAL CONDENSATION

Transport ◽  
2005 ◽  
Vol 20 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Damian Gasiorek ◽  
Arkadiusz Mežyk ◽  
Eugeniusz Switoński
Keyword(s):  
Dynamic Model ◽  
Software Package ◽  
Electromechanical Model ◽  
Electromechanical Drive ◽  
Mechanical Subsystem ◽  
Drive Systems ◽  
Dynamic Phenomena

This paper presents a method of developing a dynamic model enabling the study of the effect of the flexibility of the housing on dynamic phenomena in electromechanical drive systems. The research was performed on the basis of an electromechanical model with feedback between the mechanical subsystem (toothed gear with housing) and the electrical subsystem using a software package developed by the author in MATLAB environment.

A Dynamic Model of Magneto-Active Elastomer Actuation of the Waterbomb Base

2014 ◽  
Author(s):  
Landen Bowen ◽  
Mary Frecker ◽  
Timothy W. Simpson ◽  
Paris von Lockette
Keyword(s):  
Dynamic Model ◽  
Special Interest ◽  
Software Package ◽  
Applied Field ◽  
Active Material ◽  
Active Materials ◽  
Stiffness And Damping ◽  
Torsion Springs ◽  
Elastomer Actuation ◽  
Origami Engineering

Of special interest in the growing field of origami engineering is self-folding, wherein a material is able to fold itself in response to an applied field. In order to simulate the effect of active materials on an origami-inspired design, a dynamic model is needed. Ideally, the model would be an aid in determining how much active material is needed and where it should be placed to actuate the model to the desired position. A dynamic model of the origami waterbomb base, a well-known and foundational origami structure, is developed using Adams, a commercial dynamics software package. Creases are approximated as torsion springs with stiffness and damping. The stiffness of an origami crease is calculated, and the dynamic model is verified using the bistability of the waterbomb. An approximation of the torque produced by magneto-active elastomers (MAE) is calculated and is used to simulate MAE-actuated self-folding of the waterbomb.

scholarly journals REDUCTION OF VIBRATIONS IN ELECTROMECHANICAL DRIVE SYSTEMS WITH VECTOR CONTROL

Transport ◽  
2004 ◽  
Vol 19 (6) ◽  
pp. 276-279
Author(s):  
Paweł Bachorz ◽  
Eugeniusz Switoński ◽  
Arkadiusz Meżyk
Keyword(s):  
Genetic Algorithms ◽  
Control System ◽  
Vector Control ◽  
Structural Parameters ◽  
Power Drive ◽  
Design Variables ◽  
Electromechanical Drive ◽  
Pi Controllers ◽  
Drive Systems ◽  
Vector Control System

This paper presents the issues of modelling electromechanical drive systems in a mechatronic approach. The effect of a vector control system on the dynamics of the system is shown. The optimisation of the system in order to minimise vibration amplitudes and amplitudes of forces in selected kinematic pairs of a high power drive system was performed with the use of genetic algorithms. Design variables of the optimisation process comprised the structural parameters of the mechanical part as well as the settings of PI controllers of the vector control system. The selected results of numerical computations are presented.

Sensorless Force Control Interface for DEAP Stack-Actuators

2015 ◽  
Author(s):  
Thorben Hoffstadt ◽  
Jürgen Maas
Keyword(s):  
Force Control ◽  
Electromechanical Coupling ◽  
Force Measurement ◽  
Scale Up ◽  
Electroactive Polymers ◽  
Open Loop ◽  
Control Interface ◽  
Electromechanical Drive ◽  
Electrostatic Pressure ◽  
Drive Systems

Transducers based on dielectric electroactive polymers (DEAP) offer an attractive balance of work density and electromechanical efficiency. For example in automation and haptic applications, especially multilayer transducers are used to scale up their absolute deformation and force. Depending on the application different transducer controls have to be realized to match the specifications of the particular application. However, analogous to conventional electromechanical drive systems an inner sensor-less force control can be realized for DEAP transducers, too. For this force control the nonlinear relations between voltage and electrostatic pressure as well as the electromechanical coupling have to be considered. The resulting open-loop force control can be used for superimposed motion controls, such as position, vibration and impedance controls. Therefore, within this contribution the authors propose a model-based feedforward force control based on an overall model of the transducer that does not require any force measurement. Finally, the derived open-loop force control interface is experimentally validated using in-house developed DEAP stack-transducers and driving power electronics.

Simulation Investigations of Influence of Tooth Depth Coefficient on Dynamic Phenomena in Toothed Gear

2016 ◽  
Vol 817 ◽  
pp. 41-46
Author(s):  
Grzegorz Peruń
Keyword(s):  
Dynamic Model ◽  
Point Of View ◽  
General Level ◽  
Theoretical Point ◽  
Gear Pair ◽  
Contact Ratio ◽  
Dynamic Forces ◽  
Toothed Gears ◽  
Dynamic Phenomena

The increase of transverse contact ratio (εα) value usually allows reducing general level of gear vibroactivity. Article put to the test influence of coefficient εα value on dynamic forces in mesh zone with use of dynamic model of toothed gear. From theoretical point of view, the optimum value of transverse contact ratio is equal 2, what mean, that in mesh are always two pair of teeth. Obtainment such value of coefficient εα requires another construction of toothed wheels – wheels with HCR (High Contact Ratio) profile teeth. On result of occurrence of different deviations in toothed gears, as well as the dynamic phenomena, obtainment of continuous two-pair cooperation of gear pair is impossible and when this necessary is, solutions with near or exceed optimum value of coefficient are applied.

Modelling of Power Transmission Systems for Design Optimization and Diagnostics of Gear in Operational Conditions

2013 ◽  
Vol 210 ◽  
pp. 108-114
Author(s):  
Grzegorz Peruń ◽  
Bogusław Łazarz
Keyword(s):  
Dynamic Model ◽  
Power Transmission ◽  
Test Stand ◽  
Laser Vibrometer ◽  
Operational Parameters ◽  
Operational Conditions ◽  
Power Transmission Systems ◽  
Laboratory Examinations ◽  
Transversal Vibrations ◽  
Dynamic Phenomena

This article presents the author's dynamic model of power circulating gear test stand. It was assumed, that properly defined and next identified model can be used to analyze dynamic phenomena in meshing and bearings of gears and allows optimizing their construction, especially to minimize their vibroactivity. The article includes description of the construction of a test-stand, as well as short characteristic of the dynamic model. Afterwards it was presented verification, whether the model was correctly fine tuned. For verification purpose, were conducted laboratory measurements of velocity of transversal vibrations at the test-stand using laser vibrometer. Results of laboratory examinations were compared with the results achieved during computer simulation. Developed and presented dynamic model take into account a number of design, technological and operational parameters of gear. It was also presented algorithm of researches aimed at minimizing the vibroactivity of gear.

scholarly journals Verification Methodology for Simulation Models of the Synchronous Generator on Transients Analysis

2021 ◽  
Vol 11 (24) ◽  
pp. 11734
Author(s):  
Branko Tomičić ◽  
Antonija Šumiga ◽  
Josip Nađ ◽  
Dunja Srpak
Keyword(s):  
Dynamic Model ◽  
Software Package ◽  
Short Circuit ◽  
Simulation Models ◽  
Synchronous Generator ◽  
Short Circuit Current ◽  
Torque Transmission ◽  
Three Phase ◽  
Dynamic Simulation Model ◽  
Verification Methodology

During transients that occur in an electric network, large currents can flow and large electromagnetic torques can be developed in electric generators. Accurate calculation of currents and magnetic fields during transients is an important element in the optimal design of generators and network parts, as well as mechanical parts of machines and other torque transmission parts. This paper describes the modeling of a sudden three-phase short-circuit on a synchronous generator using the finite element method (FEM) and the dynamic model. The model for simulations that use the FEM was built in the MagNet software package, and the dynamic model is embedded in the MATLAB/Simulink software package. The dynamic simulation model of a part of a network with two identical generators, represented by equivalent parameters, was developed. The results obtained after the simulation of a sudden three-phase fault in the generators by both methods are presented, including three-phase voltages, three-phase currents, machine speeds, excitation voltages, and mechanical power. In particular, the short-circuit current in the phase with the highest peak value was analyzed to determine the accuracy of the equivalent parameters used in the dynamic model. Finally, the results of these two calculation methods are compared, and recommendations are presented for the application of different modeling methods.

Self-Excited Oscillation Analysis of a Multidegree-of-Freedom System With Cubic Non-Linearities: Dynamic Problems in Rolling Mill (IV)

1991 ◽  
Author(s):  
YongDe Chen ◽  
YeYi Xu
Keyword(s):  
Dynamic Model ◽  
Internal Resonance ◽  
Rolling Mill ◽  
The Self ◽  
Dynamic Problems ◽  
Oscillation Analysis ◽  
Excited Oscillation ◽  
Drive Systems ◽  
Almost All ◽  
Zero Frequency

Abstract In nalyzing the self-excited oscillation in drive systems of a rolling mill, almost all of the scholars didn’t consider the internal resonance and zero-frequency. We indicate that these important factors couldn’t be neglected. In this paper, dynamic model is reconstructed, and self-excited oscillation is discussed in the presence of an internal resonance. Several new conclusions are drawn. These results are useful for design of blooming mill drive systems.

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