=Paper=
{{Paper
|id=Vol-2740/20200357
|storemode=property
|title=Automation of Reliability Assessment of Functional Elements of
Flexible Automated Production Based on Functional Network Methodology
|pdfUrl=https://ceur-ws.org/Vol-2740/20200357.pdf
|volume=Vol-2740
|authors=Evgeniy Lavrov,Nadiia Pasko,Olga Siryk,Volodymyr Mukoseev,Svitlana Dubovyk
|dblpUrl=https://dblp.org/rec/conf/icteri/LavrovPSMD20
}}
==Automation of Reliability Assessment of Functional Elements of
Flexible Automated Production Based on Functional Network Methodology==
https://ceur-ws.org/Vol-2740/20200357.pdf
Automation of Reliability Assessment of Functional
Elements of Flexible Automated Production
Based on Functional Network Methodology
Evgeniy Lavrov1’[0000-0001-9117-5727]’, Nadiia Pasko2’[0000-0002-9943-3775]’, Olga Siryk3’[0000-
0001-9360-4388]’
, Volodymyr Mukoseev 2,, Svitlana Dubovyk 2
1
Sumy State University, Sumy, Ukraine
2
Sumy National Agrarian University, Sumy, Ukraine
3
Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
prof_lavrov@hotmail.com, senabor64@ukr.com,
lavrova_olia@ukr.net, muksvn@gmail.com,dubovyksg@gmail.com,
Abstract. In the article, we propose to consider the reliability of flexible auto-
mated production and justify the need for functional decomposition of automat-
ed systems, followed by the description of processes in the form of functional
networks. We have developed the principles of variant modeling for flexible
production systems, the structure, and information and software of information
technology for reliable design of automated production. The test proved the ef-
fectiveness of the proposed toolkit.
Keywords: Reliability, Flexible Manufacturing System, Ergonomics, Com-
puter Modeling, Man-Machine, Algorithm of Functioning, Functional Network.
1 Introduction
Computerization and flexible control systems are becoming a trend of the modern
stage of society development [1-4]. Flexible manufacturing radically changes the
traditional, years-old approaches to production organization. Current technology,
which is based on the differentiation of the process of machining parts for numerous
operations and transitions performed on various machines, has lost its economic ad-
vantages, because production became much more complex and its range began to
change more often. The essence of the concept of flexible automated production is
that it allows you to switch from the release of one product to the release of another
without reconfiguring the equipment or with the reconfiguration performed in parallel
without stopping the release of the current product [5-8]. Unfortunately, the efficiency
and reliability of flexible production systems (GPS) do not always meet current re-
quirements in practice [1, 8].
Copyright © 2020 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).
2 Statement of the task
Unfortunately, the classical theory of reliability [10-14], methods of estimation and
optimization of production systems [10, 15, 16], methods of estimation of reliability
of operational personnel [17-19], do not have in their arsenal a complete library of
models necessary for operative obtaining assessing the functional reliability of the
processes occurring in the GPS.
In this regard, we aim to provide the possibility of prompt automated analysis of
options (from the point of view of reliability) for organizing the operation processes
in flexible manufacturing systems (FMS), taking into account the reliability of all
structural elements and features of functional elements [6-9].
3 Results
3.1 Analysis of the functional structure of the FMS
For the normal operation of the FMS, a number of functional subsystems must be
included in its composition. Among them:
Warehouse module is an automatic warehouse, i.e. dispenser with an automatic
search and transfer system to and from the warehouse, pallets, trays, etc. on vehi-
cles.
A transport module is a complex of automatic vehicles together with a system for
automatically controlling the movement of these vehicles along a route.
The installation module includes a set of equipment for the installation of work-
pieces into fixtures and pallets. (These three modules are combined into a
transport and storage module).
A tool module is an entire tool economy integrated into a tool management subsys-
tem.
The production module is the technological equipment that forms the FMS ma-
chine tool system.
The test module consists of a quality control section, including CNC control and
measuring machines, test benches, etc.
ACS module is a complex of a central computer, intermediate mini-computers and
microprocessors in conjunction with all the mathematical and software.
3.2 Development of principles for modeling the implementation of GPS
function
Modeling and optimizing the operation of FMS becomes possible if you develop a
technology based on the principles of:
Functional decomposition (division of the process into separate functions - accord-
ing to subsystems, as described above).
A formalized description of all processes in the form of functional networks (FN)
[8, 20-22] (unlike other network methods, for example [23, 24], they allow not on-
ly describing, but also evaluating and optimizing processes).
Consideration of possible failures, malfunction of hardware and software, human
operator errors, as well as modeling diagnostic processes, identifying errors and
problem situations and restoring normal operation processes.
Maintaining databases on the reliability of all structural elements (hardware, soft-
ware, human operator).
Maintaining databases of typical options for the implementation of functional
structures (as in Fig. 1).
Automatic analysis and calculation of the probability of error-free and the proba-
bility of timely implementation of alternative options for the organization of func-
tioning.
Taking into account the influence of individual characteristics of operators on the
reliability of processes (including qualifications, motivation, workload, intensity of
activity, category of work severity, etc.).
Etc.
Fig. 1. A fragment of the description of the operation of the transport and storage system (sym-
bols and composition of operations - see [20])
3.3 Description of information technology
Information technology (Fig. 2-7) provides:
The accumulation of models necessary to obtain estimates of the probability of
error-free and timely execution (for typical functional units (TFU) and typical
functional structures (TFS);
Accumulation of models of typical processes;
Accumulation of input data for calculations;
Automatic analysis of operational options;
Automatic selection of the best option.
3.4 Testing
The developed system was used to design the functioning processes of flexible manu-
facturing sections of machining, as well as several other automated systems [8, 25-
29].
Fig. 2. A set of information and software automation tools for a reliable design of FMS
Fig. 3. Scheme of interconnections of tasks of the software package
Fig. 4. The main form of the system
Fig. 5. Examples videogram of a computer program. Algorithm of the functioning of the robot
manipulator. Variants of functional structures
Fig. 6. Examples videogram of a computer program. Assessment results of the algorithms of
the functioning of the robot manipulator
Fig. 7. Examples of videograms. Production module control algorithm: a - functional network;
b - reduction report and evaluation result
4 Conclusion
The functional network provides modeling of production management processes,
transport, warehouse operations, and preparation of control programs. It is a conven-
ient tool for assessing the accuracy and timeliness of the implementation of FMS
functions. The information technology developed on the principles of functional net-
work reduction is a convenient tool for a variant analysis of automated control pro-
cesses in FMS.
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