Embedding Mobile Agent Technology into Real Time Vibration Sensor for Condition-Based Maintenance
' Abd. Samad Hasan Basari 2 Burairah Hussin 3Abdul Samad Shibghatullah
Yau Wen Jiun e-mail:
[email protected]
Faculty of Information & Communication Technology Universiti Teknikal Malaysia Melaka Melaka, Malaysia
e-mail:
C abdsamad.2burairah.3samad}@utem.edu.my
Abstract-Machines performance and its availability in the
Vibration
everything is in good condition. However, the technical staffs
mobile
A system to evaluate the
agent
and
vibration
much
information
and defective bearings [1]. There are some existing systems that relate to real-time
machines' condition and notify to the engineers is developed. of
contains
unbalance, misalignment, eccentricity, mechanical looseness,
schedule. This research aims to assist technical staff including
combination
sign
often provide indications of machine deterioration, such as
to check the machines at different places by following the
The
warning
concerning the operating condition of a machine. These signs
including engineers are underutilized. This is due to they have
engineers to solve these problems.
LITERATURE R EVIEW
II.
factory are essential to the production unit. Therefore the technical staffs have to monitor the equipment to ensure
approaches for condition-based maintenance. Firstly, the
sensors
researches on Omni directional scenes in a machine room,
technology are utilized to implement the system. The role of
production
vibration sensor is to monitor the condition of the machine.
plant,
pump
house,
laboratory
and
other
equipments in factories [2]. The scenes are first captured
Meanwhile the mobile agent technology is used to create the wireless environment for machine and user to communicate
using
each other. When the vibration conditions exceed the normal
hyperbolic
a
thermal
value, a message via SMS (Short Message System) will be sent
captured scenes with number of machines to be monitored
to engineer's hand phone and email to notify the problem.
are then fed into a computer for image processing and alarm
IR
camera
attached
to
a
custom
made
(infrared radiation) reflected mirror. The
purposes.
Keywords- mobile agent technology, vibration, condition monitoring
This system is being improved by increasing the angle of view, minimize the hardware to reduce the cost and generate thermal image with higher data compression.
I.
This system includes 3 main features:
INTRODUCTION
•
In most factories there are usually numerous critical analysis,
each
machine
needs
to
acceleration
at
various
points.
orientations
are
required
in
each
be
monitored
Different point
on
its
•
acceleration
for
vibration
performed through accelerometer.
analysis
is
•
normally
item
can
be
even in poor
checking
and
monitoring
every
single
machine/item manually in dark place. Effective automatic machine condition monitoring threat (machine/item overheating) arises.
used to measure acceleration of motion of a machine's
Secondly is a research on the Development of Real-Time
structure at each various point.
System for Vibration Detecting System [3]. This is a real
Vibration Management System (VMS) is developed to VMS
machine/
that will raise alarm/alert whenever every security
Accelerometer can be
complement the existing system. Furthermore
surrounding
Infra red imaging for application avoid
number of records need to be taken. In order to measure the performance,
the
monitored. lighting condition. Maintenance staff/ technician can
monitoring
purpose. Thus, on every round of data collection a large machines
3600 degree viewing using single thermal camera to ensure
machines that need to be monitored. To enable thorough
time Linux system for the self-designed vibration detecting
is
system, coupled together with RTLinux patches. RTLinux is
embedded with mobile agent technology to perform better
a
performance and assisting in making decision. The purposes
small,
Developing
for developing VMS are to store and analyze the vibration
deterministic, real-time
real-time
applications
operating in
RTLinux
system. usually
requires splitting the application into two parts:
record. VMS will send the alert message to the engineers
•
through email and Short Message System (SMS).
RT-task or RT-threads: tasks with hard real-time constraints programmed and executed at kernel level.
978-1-61284-486-2/111$26.00 ©2011 IEEE
591
•
Figure I.
Linux user processes: tasks with soft or no real-time
Analysis of Logical Design
constraints. Unlike RT-tasks, the graphical system and some networking facilities are available for
A.
these tasks, so those parts of an application that need these
resources
have
to
be
executed
as
Fig. 2 shows the system architecture for overall VMS
Linux
system. The architecture is based on the SMS and vibration
processes. Thirdly
is
on
the
new
methodology
for
measurement i.e. accelerometer [11], [12]. The explanation
the
of the process is stated as below.
implementation of real time based on circuit architecture mapped
from
a
MATLAB/Simulink
model
[4].
System Architecture
Signal
processing applications such as Finite impulse response" (FIR) filters and fast Fourier transform are treated as systems. The
signal
processing
applications
are
implemented
in
hardware using a system generator toolbox, which translates a Simulink model in a hardware description language (HDL) for field programmable gate array (FPGA) implementations. Fourthly is relating on the research about adapting an expert system to machine condition monitoring system [5]. By adapting the expert system to the machine condition monitoring system, there will be greater analysis throughput and enabling technicians to perform routine analysis. Finally is about a case study on Vibration analysis diagnostics by continuous-time models [6]. This condition monitoring system is developed based on statistical models capable of forecasting the state of the equipment combine with a cost model consisting of defining the time of
Figure 2.
preventive replacement when the minimum of the expected cost per unit time is reached in the future.
The features of
Firstly,
the system are: •
• •
VMS
System Architecture
(Agent2)
will
import
the
data
from
Omega's records (Agent!) to database.
It is developed for bivariate signal.
Secondly, the data will be analysed by VMS. VMS will
The statistical model is set up in a continuous-time
compare the value with max and min limited value. If the
framework.
accelerometer reading value is over the limited value, VMS
It has been developed from scratch for real case
will send email to engineers' mailbox (Agent3). Beside,
study and may be generalized to other pieces of
Ozeki Message Server will receive alert message and mobile
equipment.
phone numbers from VMS. Finally,
III.
Ozeki
Message
Server
will
send
the
alert
message to engineers according to the received mobile phone
ANALYSIS AND SYSTEM DESIGN
number. The procedures will repeat from the beginning every 2 second.
The design of the agent approach is based on the web based and mobile intelligent agent [7], [8], [9], [10]. Fig. I show
the
analysis
of
logical
design
based
on
agent
B.
technology. The factory machine (FM) will act as an agent!.
Overall Structure of VMS. There are 2 users for VMS which are administrator and
When agent! received information about vibration, the signal
engineer.
will be sent to VMS as agent2. Then the system will send the
Fig.
3
shows
the
navigation
diagram
for
administrator and fig. 4 shows the navigation diagram for
message to factory maintenance team.
engineer. The administrator can manage the engineers' information, job sheet, job sheet's report and accelerometer's record. Meanwhile engineer can manage job sheet, job sheet's report and accelerometer's record. However engineer is not allowed to delete any information from database.
595
VMS
Login as admin I
Main Page
�
�
�
Manage Profile
Manage Engineers
Manage Job Sheet
�
Manage Job Sheet Report
Manage : Accelerometer : Record
I
�
Add, Edit, D�lete I " Engmeers' " Information
Edit Profile
i
I
,
Add, Edit, , Delete Job Sheet Report's ·,jnformation
Add, Edit, Delete Job Sheets' , Information
I
Set Max ani! Min Limit i
