On complexity reduction of the discrete-event subsystem of Flat Hybrid Automata for control design

2020 ◽  
Vol 68 (7) ◽  
pp. 529-540
Author(s):  
Tobias Kleinert ◽  
Frederik Zahn ◽  
Veit Hagenmeyer
Keyword(s):  
Heuristic Algorithm ◽  
Adjacency Matrix ◽  
Discrete Event ◽  
Control Design ◽  
Differential Flatness ◽  
Hybrid Automata ◽  
Connected Automaton ◽  
Strongly Connected ◽  
Design Perspective ◽  
Technical Systems

AbstractThe class of hybrid systems describes most technical systems in great detail. However, the respective models and their behavior tend to be very complex. Recently, a new subclass of hybrid automata has been introduced, the Flat Hybrid Automata (FHA) that relies on the concepts of differential flatness for the continuous parts, and strongly connected automaton graphs for the discrete event part, in order to deal with the complexity from a design perspective. Therefore, we introduce in the present paper an approach to reduce the automaton graph of an FHA in a systematic way by removing edges from the adjacency matrix. The main contribution of the paper is twofold: Firstly, based on practical considerations we develop a heuristic algorithm to reduce the automaton graph. Secondly, we present possible ways to include knowledge about the system in the reduction.

scholarly journals МОДИФІКАЦІЯ МЕТОДУ УРАХУВАННЯ РИЗИКІВ ПРОЕКТУ РОЗРОБКИ ТЕХНІЧНИХ СИСТЕМ

2019 ◽  
pp. 55-62
Author(s):  
Анастасія Дмитрівна Морікова ◽  
Ольга Костянтинівна Погудіна
Keyword(s):  
Discrete Event Simulation ◽  
Discrete Event ◽  
Aircraft Engine ◽  
Systems Development ◽  
Development Project ◽  
Project Planning ◽  
Data Matrix ◽  
Improved Method ◽  
Event Simulation ◽  
Technical Systems

Subject research paper is the development of technical systems. The aim is to improve the quality of planning the basic characteristics of technical systems development project. Objective is to analyze the works in the area of risk when planning projects, justified the choice of method of planning the main indicators of the project taking into account the uncertainties and risks, developed and tested method of accounting for risks of interference in the project of development of technical systems on the example of the development of an aircraft engine. Used theoretical methods are: the method of discrete-event simulation for obtaining histograms of cost and time of development of technical systems, the method of calculating the cumulative damage risk events, the model matrix representation as a mathematical device for the presentation and study of interference risks. We obtained the following results. Analysis of existing work and standards in the field of risk management, reviewed the existing information system of risk-based project simulation and variability of the project. On the basis of the detected restriction provides an improved method for the basic parameters of the project planning. The process of identification and the following categories of risk identified: the expectations, cost, appearance of additional work, return. Given the typology of interference risks formalized the concept of additivity, synergy and cannibalization (negative synergy). An information subsystem that preparesinput to project performance simulation taking into account the risks, where the use of the data matrix relationship likelihood of risks and interference effects manifestations of risk events. Developed information subsystem was tested on calculation Show cost and runtime stages of research works on the development of an aircraft engine. Scientific novelty of the results is as follows: improved method of discrete-event simulation account of technical systems development project risks by adding a formalization of interference risks.

On Flows in Stochastic Marked Graphs

1991 ◽  
Vol 5 (2) ◽  
pp. 145-157 ◽  
Author(s):  
F. Baccelli ◽  
N. Bambos ◽  
J. Walrand
Keyword(s):  
Discrete Event Systems ◽  
Discrete Event ◽  
Point Of View ◽  
Connected Components ◽  
Timed Petri Nets ◽  
Strongly Connected Components ◽  
Stability Point ◽  
Marked Graphs ◽  
Strongly Connected ◽  
Stability Issues

In this work, the discrete event systems called Stochastic Marked Graphs (SMGs) are investigated from a stability point of view. Being a special class of Timed Petri Nets with stochastic firing times, they are studied under general assumptions of stationarity and ergodicity of the firing times and ergodicity of flows of their free strongly connected components. The values of the flows of tokens in an SMG are specified as functions of the intrinsic rates of its free strongly connected components, and various stability issues are discussed.

Enterprise-in-Environment Adaptation

2014 ◽  
pp. 216-236
Author(s):  
James S. Lapalme ◽  
Donald W. de Guerre
Keyword(s):  
System Design ◽  
Enterprise Architecture ◽  
Complexity Management ◽  
It Systems ◽  
Environment Adaptation ◽  
Worker Empowerment ◽  
Deep Culture ◽  
Design Perspective ◽  
Technical Systems ◽  
Participative Design

Enterprise Architecture (EA) is a consulting practice and discipline intended to improve the management and functioning of complex organizations. The various approaches to EA can be classified by how they define what is to be architected and what, as a result, is the relevant environment. Traditionally, management has been understood as “Planning, Organizing, Command, Coordinating, and Controlling” (POCCC), that is, the role is bounded within the organization. The corresponding EA approach suggests architecting IT systems to support management, with the implicit environment being members of the organization as well as partner organizations. As the objective of EA practice expands to include organizational members, technical systems, and a wider set of stakeholders, so too does the complexity it must address. This results in an enlarged domain of issues and concerns. Finally, if the objective of EA is a sustainable enterprise, then physical, societal, and ecological environments radically increase the complexity of actualizing this goal. Corresponding to this increase in scope is a parallel shift in the scope of management concerns. With the goal of pushing EA towards concerns regarding enterprise sustainability, an open socio-technical system design perspective of EA, which we have named Enterprise-in-Environment Adaptation (EiEA), is discussed. EiEA offers a comprehensive approach to respond to the demands for complexity management that arise when working towards enterprise sustainability; yet, it requires that organisations also embrace deep culture changes, such as participative design, worker empowerment, as well as shared accountability and responsibility, to name a few.

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