scholarly journals Development and research of selectively invariant electromechanical systems with elastic kinematic units based on the separation of the harmonic disturbance model

Vestnik IGEU ◽  
2021 ◽  
pp. 49-59
Author(s):  
I.A. Tikhomirova ◽  
S.V. Tararykin
Keyword(s):  
Distributed Model ◽  
Synthesis Process ◽  
Parametric Synthesis ◽  
Electromechanical Systems ◽  
Special Effects ◽  
Electric Drives ◽  
Mechanical Part ◽  
Pros And Cons ◽  
Disturbance Model ◽  
Mechanical Elements

Currently there is a big variety of structure solutions of the selective invariant electromechanical systems with different layout schemes of disturbance internal model for electric drives with robust kinematic units. However, methods of structural parametric synthesis for controllers with combined triggering model only were developed selective invariant systems with “robust” kinematic of mechanical part. Consequently, further improvement of the structure variety of systems for special effects of elastic kinematic units of mechanical part is of current interest. It can be performed by including the distributed model of harmonic disturbance into the synthesis process. Structural parametric synthesis is based on the methods of modal control theory, regulators reduction, selective invariant principals, velocity separation in local sub-systems, regulation by coordinates of state and by output, cascade and slaved coordinates regulation, splitting of disturbance model to separate elements in managing contours. Investigation was performed by specified computing experiments with synthesized electromechanical system models. Now, new structure solutions of selective invariant electromechanical systems with elastic mechanical elements are developed. They are created by using the additional separation principle for disturbance model into separate parts and moving them in to the contours of “fast” and “slow” sub-systems. Acquired models of synthesized systems were compared upon the complex of main quality indicators, the comparison was based on the performed computing experiments. The acquired results of complex performance of set requirements demonstrate main pros and cons for each variant of selective invariant electromechanical systems with elastic elements, determine areas of their preferred usage and allow the developers to simplify the solution of structure optimization based on selected schema of compromises.

scholarly journals Preparing for the challenge of efectively distributing leadership: Lessons learned from the creation of a leadership team

2010 ◽  
Vol 2 (1) ◽  
pp. 35-46
Author(s):  
Kathryn Singh
Keyword(s):  
High School ◽  
Distributed Leadership ◽  
Institutional Context ◽  
Leadership Team ◽  
Lessons Learned ◽  
Distributed Model ◽  
Leadership Model ◽  
Pros And Cons ◽  
Leadership Lessons ◽  
Over Time

The experience of the author in creating and working with a leadership team over the course of three years in a private Mexican high school is shared. An overview of distributed leadership is provided as the theory underlying the approach taken at this new site. Information is shared on the actual institutional context of the team as well as the director’s strategy for creating and preparing the team before and during their work. In addition, the author shares the way in which the group evolved over time. Pros and cons for working under a distributed model are discussed as are recommendations for leaders and trainers of leaders. Creating a successful distributed leadership model requires a great deal of thought and effort. It is crucial that members are willing and able to make and implement wise, informed decisions. It is important, as well, to be aware of a new “worldview” that must be developed at the site in order for the work of the group to be accepted and valued.

scholarly journals Comparative Study and Overview of Field-oriented Control Techniques for 6-phase PMSM

2021 ◽  
Author(s):  
Marek Furmanik ◽  
Lukáš Gorel ◽  
Daniel Konvičný ◽  
Pavol Rafajdus
Keyword(s):  
Mathematical Model ◽  
Comparative Study ◽  
Permanent Magnet ◽  
Synchronous Machine ◽  
Experimental Results ◽  
Field Oriented Control ◽  
Permanent Magnet Synchronous Machine ◽  
Electric Drives ◽  
Control Techniques ◽  
Pros And Cons

The paper interprets a comparison of two mostly used techniques of a field-oriented control for 6-phase electric drives, with their pros and cons, as well as their differences in construction and behaviour. Both of these approaches have been realized. Frequency and step responses analysis have been demonstrated with a 6-phase permanent magnet synchronous machine. Experimental results have been compared with simulations based on a mathematical model.

Mechanical Subsystem as Implementation of Active Reduction of Vibration

2013 ◽  
Vol 198 ◽  
pp. 657-662 ◽  
Author(s):  
Katarzyna Białas
Keyword(s):  
Vibration Reduction ◽  
System Structure ◽  
Second Phase ◽  
Parametric Synthesis ◽  
Mechanical Subsystem ◽  
System Vibration ◽  
Mechanical Elements ◽  
Definition Of ◽  
Two Stages

The main objective of this work is to present a reverse task of the dynamics of discrete vibratory mechanical systems. This task is reverse to analysis and is called structural and parametric synthesis. As a result of performing the synthesis one obtains a structure and values of individual parameters of the system of required properties. Such properties refer to the determination of individual frequencies of the system vibration. Synthesis is divided into two stages. The first stage consists in definition of the structure as well as the values of parameters of a passive system without vibration reduction. In the second phase, one selects a method of vibration reduction as well as system structure and parameters with vibration-reducing elements. In case of already-existing systems, the first stage consists in the identification of the system and its analysis. There are no changes in the second stage (Figure 1) [. Another objective of this work is to use mechanical elements in the form of kinematic excitations as the implementation of active reduction of vibration as well as to check the influence of this subsystem on the basic system. The application of the synthesis presented in this work enables the correction of the already-existing machines and devices as well as the modification of newly-created systems with the view of their future functioning.

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