Industrial
Experiences
February 1996 -
June 2021
During teaching at sharif University of
Technology the following Industrial projects
have also been completed. |
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Investigation on Drilling rig Maintenance
Methods & Certificates
This is a
maintenance project with one of the Iranian Oil
Drilling Company in order to optimize their
current maintenance costs. At the end of the
project we are expected to give a
new
methodology and strategy for their maintenance.
Figure 1 shows one of these drilling rigs.
Fig 1- Drilling rig
Dc
Motor Vibration Analysis for Ettehad Motor
The very small
electro motor can be seen in Fig. (2) used in
vehicles for ventilation. The manufacturer used
to have noise and vibration problem on them. We
carried out vibration measurement and analysis.
Our analysis based recommendation has been
implemented by the manufacturer. Now they are
producing the unit without any noise and
vibration
problem (Figure 2).
Fig. 2- Ettehad Motor electromotor
Effect of earthquake on residential buildings
A residential
building has been erected in the earthquake
laboratory of sharif university of Technology
for earth quake experimental simulation as shown
if Fig. (3) and we were
interested in the gas
piping behavior in this building. Through the
test we have investigated the piping behavior
from the start of the earth quake simulation
till the end of test (Figure 3).
Fig. 3- Residential building
Touchal Tele cabin Condition Monitoring
We are involved in
vibration based monitoring in Touchal Tele
cabin company for two years. This includes
vibration measurement analysis and
recommendation to the owner for
optimized
maintenance activities and maximum efficiency.
Figure ( 4) shows one of their cabins in
operation.
Fig. 4- Touchal Tele cabin
Vibration Condition Monitoring for Abadan Power
Plant
We have run
condition monitoring for more than two years in
Abadan power plant as shown in Fig. (5). The
procedure was to measure the vibration in
important machines
regularly and predict any
necessary maintenance work in the plant. This
reduced the forced outage from 2.5% to .5% in
this plant
Fig. 5- Abadan Power plant
Material
tests in solid mechanics laboratory
During 5 years work and superviso in the solid
mechanics laboratory variety of material tests
including tensile, compression, torsion,
pressure and fatigue tests were conducted for
different industries. Fig. 1 shows checking the
u bent test of a welded speciman.
Fig. 1 visual check for crack in a u bent test
Fig. 2 Performing a tensile test with a 2000KN Machine
Blade Failure
investigation in Turbine 101-j Razi
petrochemical company
Blade failure in low pressure part of a steam
turbine has been investigated in this study. For
this investigation all related information and
data have been collected from the plant.
These
information include process parameters,
vibration data, and maintenance history.
Microstructure study, chemical composition
determination and cracked section study have
also
been carried out. The results show creep
cavities in the failed Blades. The damaged blade
is shown in Figure3
Fig. 3 Damaged blades of gas turbine in Razi Petrochemical
company.
Vibration
Investigation in Alstom Locomotive in Tehran
The aim of this
project was to give the vibration measured
values and analysis at different locations of a
locomotive in order to find the reasons of
radiator leakage. For comparison
some
measurements are carried out in two locomotives.
The measured values include velocity and
acceleration in unloaded (idle) and loaded
(notch 8) conditions in three
directions.
According to measured values of vibration and
considering standard ISO 10816-6, the engine of
faulty locomotive is not running smoothly. This
conclusion can also be achieved by comparing the
vibration of the engines in the faulty
locomotive and healthy locomotive at similar
locations and operating conditions. Gear mesh
frequency can be seen in the
frequency spectrum
of the faulty unit. According to the
measurements and analysis it can be concluded
that the faulty gear needs to be replaced.
Figure 4 shows Dr Behzad attending
at Tehran
railway maintenance center and figure 5 shos two
of the project team members.
Fig. 4
Dr behzad attending at Tehran Rail way
Maintenance department.
Fig. 5 Dr Behzad (left) with Salmasi and khamseh in the
train cabin.
Modal analysis
and Finite element analysis of gas turbine
blades
In this project Natural frequencis and
mode shapes for a gas turbine blade has been
obtained by experimental and analytical method.
Figure 6 shows the test set up for the
experimental method in the vibration laboratory
at sharif university of technology.
Fig. 6 test set
up for finding the natural frequencies fo a gas
turbine blade.
The aim of
this project was to investigate the vibration of
hudro power plants. The main sources of
vibration in these plants are found and
measurement are carried out to investigate
the
high vibration of the turbine generator set.
Figure 7 shows the runner of of the abbaspour
250MW hydro power plant and Figure 8 gives the
result of numerical model of the
water carriage
pipe.
Fig. 7 Runner
of Abbaspour hydro power plant.
Fig. 8 numerical results for the simmulation of
Abbaspour hydro power plant water carriage
pipes
Vibration
investigation in utility pump of khorasan
petrochemical complex.
In
this industrial project, abnormal vibrations of
two similar centrifugal pumps in a petrochemical
factory have been studied. The piping
arrangement around the pump is shown
in figure
9.These two pumps discharge sump from the
neutralizing tanks and work as standby.
Excessive vibration of the pumps brought some
concerns and limited the operation.
Some primary
mechanical repairs and adjustments had been done
on the pumps but the problem was remained
unsolved. The purpose of the study was to find
source of vibration
and recommend a practical
remedy to solve the problem. To this mean,
vibrations on electromotor bearing, pump
bearings, pipeline and foundation in various
operational conditions
were measured. Historical
records of pump vibrations and repairing actions
were also considered. The analysis showed that
the pump was source of vibration. The
predominant
frequency component of vibration was
associated to blade passage frequency. This
frequency is caused by fluidic problems in the
pump.
Measurements also showed
that operating point of the pump, which is
controlled by a throttling valve at the
discharge, has major effect on the pump
vibration severity. When the
pump operates at
off-design conditions vibration amplitude rises
dangerously. Near BEP vibration amplitude
reaches to its minimum, which is greater than
recommended values yet.
After investigation, the
source of problem was found to be fluidic
problems, operating point of the pump and
throttling valve. Using of a variable-speed
drive for electromotor was
proposed to reduce
the pump speed from 3000 RPM to 1500 RPM to
solve the problem.
Fig. 9 Piping
arrangement around the pump of Khorasan
petrochemical plant.
Mechanical Fault
simulator rig [design,manufacture,test].
The main objective
of this project was to design manufacture and
tes a rig for fault simmulation of rotating
machinery. The design manufacture and test of
this apparatus were done
at Sharif university of
technology. This apparatus has been made for NRI(
a research center for power stations. Figure 10
shows the rig while being tested by Dr Behzad.
Fig. 10 fault
simmulator rig.
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