The elements of a mechatronic system, which are mechanical, electrical and electronic, are interconnected and the connection between the different parts must act as a unit. The
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and the way of testing the system during production. Finally, the system must meet the requirements of the customer. The mechatronic system discussed is an industrial product, created in a digital factory.
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Smart Sensors: Analyzing Efficiency of Smart Sensors in Public DomainDr. Amarjeet Singh
The paper gives the brief idea of smart sensors,
structure and its application. Smart sensor as compare to
other sensors can sensor anything with the special computing
devices connected with each other in sensor network. These
smart sensors first convert the digital signals to analog signals
and then communicate the message to the device. Now a days
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Design and Testing Ways for Mechatronic Systems
1. International Journal on Cybernetics & Informatics (IJCI) Vol. 11, No.1/2, April 2022
DOI:10.5121/ijci.2022.110206 61
DESIGN AND TESTING WAYS FOR
MECHATRONIC SYSTEMS
Liviu Mihai Sima
1
PhD student, University POLITEHNICA of Bucharest,
Faculty of Industrial and Robotics Engineering,
Department of Robots and Production Systems, Bucharest, Romania
ABSTRACT
The elements of a mechatronic system, which are mechanical, electrical and electronic, are interconnected
and the connection between the different parts must act as a unit. The exchange of information between two
components of the system is possible if there is a communication in common parameters. The interface
refers to all the ways to handle the processes in a system. The number and design of interfaces within an
architecture and system boundary significantly influence the simplicity, adaptability, and testability of a
system. Interfaces, which are hardware and software, define the functionality of the system by inserting
functions from one component to another. The article describes the method of selecting the components
and the way of testing the system during production. Finally, the system must meet the requirements of the
customer. The mechatronic system discussed is an industrial product, created in a digital factory.
KEYWORDS
Mechatronic Components, Design Structure, Hardware and Software Interfaces, Multidisciplinary
Integrated Design.
1. INTRODUCTION
Mechatronics is a branch of several engineering disciplines, focused on electrical and mechanical
systems engineering. This is about robotics, electronics, computer, telecommunications, systems,
control and product engineering. The term provides a basis for technical and practical
considerations. Engineer Tetsuro Mori from Yaskawa Electric, Japan, introduced the term
"mechatronics." Moreover, registered as a trademark under number "46-32714". [1]
The Japanese company later allowed the right to use the word in public, and after the term begin
using worldwide. In dictionaries, the term officially appeared in 2005 in Larousse (France).
Nowadays, the word is translated into many languages and is considered an essential term for the
industry. [2]
The French standard NF E 01-010 (2008) defines mechatronics as an "approach to the synergistic
integration of mechanics, electronics, automation and computing in the design and manufacture
of a product to increase and / or optimize its functionality". Many people treat mechatronics as a
modern word, synonymous with robotics or electromechanical engineering. The using of term
mechatronics denotes a rapidly developing and interdisciplinary field of engineering. It deals with
the design of products function based on the integration of mechanical and electronic components
coordinated by the control architecture. [3]
2. International Journal on Cybernetics & Informatics (IJCI) Vol. 11, No.1/2, April 2022
62
As technology advances, the engineering fields have managed to diversify. The intention of
mechatronics is to produce a design solution that unifies each of them. [4]
As a summary, mechatronics is a combination of mechanics, electronic and real-time calculation.
As in figure 1, the integration of these disciplines denotes mechatronics.
Figure 1. Approach to mechatronic discipline
2. THE EVOLUTION OF MECHATRONICS
Mechatronics is a technology that is constantly expanding. It refers to the design, manufacture
and operation of the designed products, devices and processes, traced through:
the industrial revolution (mechanization, water power, steam power);
semiconductor revolution (mass production, assembly line, electricity);
information revolution (computer and automation);
the fourth industrial revolution (physical cybernetic systems).
At the industrial level, semiconductor and information revolutions have led to major
technological advances in the design and operation of engineering products.
The disciplines of primary engineering - mechanical, electrical, civil and chemical have retained
their individual body of knowledge, textbooks and professional journals, because the disciplines
considered have an exclusively intellectual and professional territory. Those who study the field
of mechatronics can assess their individual intellectual talents and can choose one of these fields
as a profession.
This is a new scientific and social revolution, known as the information revolution, in which
engineering specialization seems to focus and diversify simultaneously. The contemporary
revolution initiated by the engineering development of semiconductor electronics, which led to a
development in life-enhancing information and communications.
In recent years, the engineers began to develop highly efficient products and processes, carefully
selecting and integrating sensors, actuators, signal conditioning, power electronics, decision-
making and control algorithms, and computer hardware and software.
The stages of mechatronics:
primary level mechatronics: integrates mechanical signaling with mechanical action at
the basic control level, such as fluid valves, switches, relays, etc.;
secondary level mechatronics: integrates microelectronics into electrically controlled
devices, such as cassette recorder;
tertiary level mechatronics: incorporates the advanced control strategy using
microelectronics, microprocessors and other application-specific integrated circuits, for
example the microprocessor-based electric motor used for robot operation;
Mechanic
s
MECHATRONIC
Electronics
Real time calculation
3. International Journal on Cybernetics & Informatics (IJCI) Vol. 11, No.1/2, April 2022
63
quaternary level mechatronics: tries to improve “intelligence” of the systems by
introducing artificial neutral network and fuzzy logic and the ability to detect and isolate
errors in the system.
The main concept of mechatronics is to work smart and efficient. In this way, we can obtain
positive results in a short time. Mechatronics describes the combination of mechanics and work
with precision engineering, sensor technology, actuator technology, computer science, and
control theory and sensor technology.
3. THE ELEMENTS OF MECHATRONIC SYSTEMS
The mechanical elements that make up the mechanical structure, the mechanism, etc. form a
mechatronic system. These may include static / dynamic mechanical characteristics and interact
properly with the environment. The mechanics of mechatronic systems require physical power to
produce motion, force, etc. [5]
Electromechanical elements refer to sensors and actuators. A servomotor turns energy into
motion, also used to apply force. This is usually a mechanical device that takes energy - usually
energy that is created by air, electricity, or liquid turned into motion. This movement can be in
any form, such as locking, gripping or removing. Actuators are in manufacturing used or
industrial applications and in devices such as motors, pumps, switches and valves. Most
mechatronic systems involve movement or action of the same kind. This motion or action applies
to any form until a large articulated structure.
Figure 2. Elements of mechatronic systems
4. International Journal on Cybernetics & Informatics (IJCI) Vol. 11, No.1/2, April 2022
64
All these components controlled from a software program uploaded in a controller. [6]
Movement is by a force or torque created that result in acceleration and displacement. Actuators
are the devices used to produce this movement or action. A sensor is a device, module, machine,
or subsystem whose purpose is to detect events or changes in its environment and to send
information to other electronic components, often a computer processor. A sensor is with other
electronic components used. Electrical elements refer to electrical components (resistor,
capacitor, inductor, etc.), circuits and analog signals. Electronic elements refer to analog or
digital electronics, transistors, amplifiers, etc. The usage of the electrical / electronic elements is
to interface electromagnetic sensors and actuators with the hardware elements of the control
interface. [7]
The hardware of the control interface allows the analog / digital interface, i.e. the communication
of the sensor signal to the control computer and the communication of the signal from it to the
actuator. The control computing hardware implements a control algorithm, which uses sensor
measurements, to calculate the control actions to be by the actuator applied. All mechanical
devices include electronic components and some type of computer monitoring or control.
Microcontrollers are more and more into electromechanical devices incorporated, creating much
more flexibility and control in the design of the system. [8]
The digital factory offers a full range of services, such hardware, and software and embedded
technology-based. This range helps manufacturers around the world to maximize the flexibility
and efficiency of their processes, thus reducing the time to deliver on the market. Full integration
of data on the industrial value chains is becoming increasingly critical for the sustainable
development of manufacturing companies. [9]
4. STRUCTURE DESIGN AND TESTING OF THE PRODUCT
Before starting the design of the mechatronic system, a person led the project of designing. This
person is the project manager. The project manager (PM) nominated by the company at the latest
before the launch of the project. If a project anticipates during the bidding phase, the PM
nominated immediately and take responsibility for the project at that time. The project manager is
responsible for leading the execution of the projects until the inclusive closure, in accordance
with the contract, in the special performance and the program. He / she is the main representative
of the company client and is responsible for making decisions on behalf of the companies within
the rules of delegation. The responsibility covers the achievement of the results at the time of
acceptance of the contract and is obliged to alert the management in case is any risk identified.
This achieving is not during the daily activities. The differences between the signed contract and
the initial offer, if any, identified at the time of signing the contract. The impact on departmental
estimates and costs addressed at that time. Therefore, differences of this nature cannot occur for
departmental cost approvals after signing the contract. However, management may request a
review of the project objectives at the beginning of the contract. A system is from the point of
view of several test models produced. The development models are different processes or
methodologies that are for project development selected, depending on the goals and objectives
of the project. It was many development lifecycle models developed to achieve different goals.
The models specify the different stages of the process and the order in which they perform. The
selection of the model has a big impact on the performed testing. It will define when, where and
what from the planned test influences the regression test and determines largely which test
techniques should be used. There are various software development models or methodologies,
such waterfall model, agile model, incremental model, RAD model, iterative model, spiral
pattern, prototype model, V-model. [10]
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Thus, a product tested throughout the production process from several points of view. Depending
on how and how much you want to test in the manufacturing process, you can follow a certain
type of model. [11]
The mechatronic system considered is the resulting integration of the electrical / electronic
system, mechanical parts and information processing. Therefore, in order to allow a systematic
process of designing mechatronic systems with a high level of integration, the so-called
multidisciplinary integrated design needed. In accordance with systems engineering practices, an
extended "V" model used as a macro-level process in the proposed design methodology. It starts
with identifying system-wide requirements and ends with a user-validated system. The
hierarchical design model adopts a micro level process. It supports specific design phases in
which individual designers can structure sub-tasks, proceed, and react in unforeseen situations. In
order to ensure coherence and traceability between the two levels, the multidisciplinary interface
model proposed. This design methodology demonstrated by studying the design process of a
mechatronic system. Any of the models presented above used to test the state of a mechatronic
system. Of course, depending on the test model chosen, there are certain advantages or
disadvantages. The design methodology presented adopts the extended “V” model as a macro
level process and the hierarchical design model as a micro level process. In a multidisciplinary
way, the interface model helps designers ensure coherence between the two levels. [12]
The macro-level design process has adopted an extended "V" model process to present the
overall flow for the mechatronic system. The left branch of the Model V extension represents the
system design sub-process and described in qualitative models. After analyzing all the
requirements for the whole system, sub-functions and subsystems defined. [13]
During the system design sub-process, design phases identified are the specification phase, the
functional model phase and the architectural phase. As an adaptation from VDI 2206, it was
created the model phase from figure 3. [14]
Figure 3. Testing methodology for a mechatronic system
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The discipline-specific design sub-process presented at the bottom of the extended "V" model. It
is the obtaining of the physical elements of the system such as hardware components or software
code. The subsystems have a very specific discipline and different design teams develop those
simultaneously. The models built by the teams in the different disciplines are largely quantitative.
The right side of the "V" model is the sub-process integration system.
In the extended "V" model, this sub-process divided into two phases:
compatibility test;
verification and validation phase.
The objective of the compatibility-testing phase is to ensure the right and multidisciplinary
integrated subsystems between different design teams. If the subsystems prove to be incompatible
with each other, then the iterative process continues. This test compatibility in the early stages of
system integration will significantly reduce the number of iterations in the later phase, so that
overall development costs and time to market may decrease accordingly. Verification and
validation at this stage used to test the integrated performance of the system and verify that the
system is working and meeting all the requirements previously proposed according to the
designed plan. If the system needs to be improved, the previous design and phases repeated. The
macro design process is developed and based on the "V" model, which considers one of the most
typical approaches to systems engineering. Therefore, the main design sub-processes (system
design sub-process, discipline-specific sub-process and system design and integration sub-
process) of the macro-level process are organized sequentially in line with practical systems
engineering. However, designers from various disciplines perform concurrent design activities in
each sub-process of the entire process to achieve better results. The organization of design
activities within the same sub-process called the micro-level design process. The hierarchical
structure applied in the three phases of the system design sub-process. The design parameter
hierarchy proposed to help designers define key parameters in specific sub-process disciplines.
The requirements specification derived from all mechatronic system requirements and they can
provide initial information about what customers are asking for. The requirements may apply to
the general system, each subsystem (or component) and the interconnection between two
subsystems. Therefore, the requirements detailed by breaking them down into additional
requirements, thus creating a hierarchy of them.
Requirements classified into several types:
global requirements;
cumulative requirements;
specific requirements;
interconnected requirements.
A functional model refers to the modelling and specification phase of functional solutions. The
functional model plays an important role during the system design process because is built as a
bridge between customers and the mechatronic system. From one side, the functions and sub-
functions proposed in the functional models used to meet customer requirements. On the other
hand, the architecture of the system established on this functional model. In this design phase,
functional models of mechatronic systems created. They must meet the specifications and
requirements so that they provide us with the basis for functional structural derivation. The
hierarchical structure used for functional modeling. If a complex mechatronic system assumed to
comprise a number of elementary functions then the functional structure of cooperation among
these elementary functions considered. A single elementary function is characterized by the
primarily use of a clearly defined effect (e.g. physical, chemical or biological) that can be
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considered as indivisible in the set of functions. Therefore, an architectural model consists of the
grouping of the sub-functions of the functional model in order to implement the proposed
function. After the process of hierarchical decomposition of the function, the designers should
implement the subsystems into the proposed sub-functions. In other words, these subsystems
should have decomposed sub-functions so that there is coherence between the functional model
and the architectural model. The complete architecture built is in the direction of breaking down
the subsystems to the architectural model phase. As a result, the decomposition process must be
applied recursively. However, there is always a research question as to what hierarchies and
granularities are appropriate for architectural models of mechatronic systems. To answer this
question, the authors help designers find out how systems can be broken down. In the proposed
architecture of the hierarchy, the system presents from top to bottom as a mechatronic system,
mechatronic mode and specific discipline-component. A mechatronic module defines as a
mechatronic subsystem at the lowest hierarchical level of the mechatronic system and is
indivisible within the set of mechatronic subsystems. "Indivisible" means that the mechatronic
module can only be broken down into specific (non-mechatronic) components, but not into other
mechatronic modules or components of the mechatronic system. The discipline-specific
components are the lowest level of system architecture considered. "Lowest level" refers to the
components which standard components obtained previous designs or within the specific
disciplines of the team. In the decomposition process proposed in two stages, the mechatronic
systems altered into mechatronic modules. At this stage, designers should consider their design
experience. For example, the mechatronic module based on the previous design or the standard
component contains certain modules made in previous projects or uses standard components.
This means that it is not necessary to break down a system into a database with discipline-
specific components. However, in such a scenario, graphics or standard components are not
always available. When there are exceptions, the second stage of decomposition repeated. Thus,
the mechatronic module divided into discipline-specific components obtained with standard
components, previous projects or discipline-specific teams. Once the mechatronic modules
divided into discipline-specific subsystems and engineers develop their interfaces during the
phase-specific design.
Two solutions presented to deal with interface incompatibilities:
solution 1: change one of the two components related to the interface; compatibility
should therefore check again; the solution call "component change";
solution 2: decomposition of the interface into a component-structured interface;
compatibility should be checked for the two newly created interfaces; the solution call
"interface decomposition".
When the interface decomposition solution adopted, the design process should return to the
architectural model. Therefore, the interface decomposition solution used as an effective support
to help designers refine the architecture of the mechatronic system. The second reason is that the
interface breakdown solution can help designers avoid design conflict. In a complex mechatronic
system, one component connected to another through several interfaces. If the component
changes, the solution adopted by the designers to resolve the possible incompatibility is to link
other interfaces to this component that prove to be compatible. This is what to avoid any
incompatibility after changing such a component. Such situations can always exist during the
design process. The interface decomposition solution does not create incompatibility design
because the new component does not affect other components of the system. If all interfaces in
the mechatronic system shown to be compatible, which means that all components properly
integrated with each other, the design process checked and validated. The verification and
validation phase used to test the performance of the integrated system and to verify that the
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system performs the proposed function and meets all the previously proposed requirements. If the
system needs upgrade, the initial operating phase will be repeated.
5. CONCLUSIONS
In the process of creating the mechatronic system, the role of the project manager as well as the
team is very important. Clear requirements from the customer are the benchmark. The design
team needs to study the international requirements for the product created. Otherwise, we cannot
meet certain requirements. Likewise, choosing a method that is too simple to manufacture and
lacks testing (such as waterfall) for a complex system can lead to extra work as well as scrap etc.
Choosing a complex model for a simple model leads to a loss of resources.
Some rules are very important in setting the objectives of each project:
understanding the customer's needs, knowing the products of competitors and deciding in
which direction you want to differentiate the product from competitors (production
period versus attractiveness, cost, quality);
adapting and improving the internal process, as well as the practices and tools used;
creating alternatives, understanding the associated trade-offs against excessive
engineering;
putting technical expenses under control;
collaboration, communication and elimination as much as possible of losses, unnecessary
work and recovery of non-compliant products;
valuing and sharing knowledge in a reusable format;
skills development and team leadership;
management of product variability and optimization of deviation from products to
projects (standard product for project A, B, C ... n);
ensuring the organizational balance between product, project and engineering discipline;
knowledge of new technologies and consideration of disruptive elements.
The strategy chosen from the beginning, based on the company's rules is very important, and the
resulting finished product needs to have the desired qualities.
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AUTHOR
Liviu Mihai SIMA was born in 1979 and obtained Bachelor in Engineering in 2002 from
University “Politehnica” Bucharest, Romania. He furthered his academic career,
completing a Master’s degree, and is currently working towards his Ph.D. at the same
University. He has published various articles in the field of transportation, mechatronics,
etc. His field interests include computer networks, IoT, railway transportation, and
mechatronics.