Title: |
Effects of
tool setting on tool cutting angle on turning operation |
Author (s): |
K. V. Santha
Kumari and Dipak Ranjan Jana |
Abstract: |
Accuracy of machined component
is one of the most critical considerations for any
manufacturer. Many key factors like cutting tool and its
setting angle, machining conditions, resolution of the machine
tool and the type of work place etc., play an important role.
However, once these are decided upon, the consistent
performance of the machine tool depends upon its ability to
accurately position the tool tip vis-à-vis the required work
piece dimension. Hence in this study the effect on Tool
setting on cutting angle has been mathematically demonstrated.
Lastly solution has been given that “Why we align the centre
and “for what height, deviation of tool when set, then what
change in tool angle should be done so as to get the result in
such a way that there will be no effect on tool and work piece
and we can get the greater accuracy of job in turning
operation. |
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Title: |
Multicarrier
trapezoidal PWM strategies based on control freedom degree for
MSMI |
Author (s): |
R. Bensraj,
S. P. Natarajan and V. Padmathilagam |
Abstract: |
This work proposes an additional
clew for the carrier based PWM methods on control of
multilevel inverters which is based on the combination of the
Control Freedom Degree (CFD) and novel carrier/reference
signals for multilevel cascaded inverter. The significance of
the proposed CFD clew on multilevel PWM techniques are
verified and well demonstrated by simulation for chosen five
level inverter. This paper presents a novel approach for
controlling the harmonics of output voltage of chosen Cascaded
MultiLevel Inverter (CMLI) employing trapezoidal PWM switching
strategies. Sub Harmonic PWM (SHPWM), Phase Shift PWM (PSPWM),
Variable Frequency PWM (VFPWM) and Carrier Overlapping PWM (COPWM)
techniques employed are evaluated for various modulation
indices using spectrum of the output voltage and other
performance measures such as crest factor, form factor etc and
the use of inverter state redundancies to perform additional
application specific control tasks. This paper focusses on
MultiCarrier Trapezoidal PWM (MCTPWM) techniques with Phase
Disposition (PD), Phase Shift (PS), Variable Frequency (VF)
and Carrier Overlapping (CO) of carrier for the chosen CMLI.
Simulations are performed using MATLAB/SIMULINK. It is
observed that PD and CO methods provide output with relatively
low distortion. It is also observed that CO is found to
perform better since it provides relatively higher fundamental
RMS output voltage and relatively lower stress on the devices.
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Title: |
Experimental
study of the effect of fuel injection pressure on diesel engine
performance and emission |
Author (s): |
K. Kannan and M. Udayakumar |
Abstract: |
Diesel
engines are the primary source of power for the heavy duty
vehicles. The advantages of diesel engines are high fuel
efficiency, reliability and durability. The performance and
emission characteristics of diesel engine depend on many
parameters. One of the important factors which influence the
performance and emission of diesel engine is fuel injection
pressure. An experimental study was performed on a light duty
direct injection diesel engine at 150 bar, 200 bar and 250 bar
injection pressure to study its effect on performance and
emission. The injection pressure was changed by adjusting the
fuel injector spring tension. The performance and emission
characteristics were presented graphically and concluded that
they were found better at the fuel injection pressure 200 bar
for the light duty engine. |
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Title: |
Dual band MSA
designs for GPS and GSM applications |
Author (s): |
Haider A.
Sabti and Jabir S. Aziz |
Abstract: |
New designs of obtaining a dual
frequency bands antenna operate on the dual frequency bands of
Global Positioning System (GPS) and Global System for
Mobile Communications (GSM) with a single-feed square
micro-strip antenna are proposed and experimentally studied.
The proposed designs are based on the different patch
dimensions loaded with four rectangular slots in the form of
cut from the sides of the square patch. The result of this
work shows that the slots loaded into the square patch
antennas offers further size reduction with multiband
properties that can be used in GPS and GSM applications.
Details of the design considerations of the proposed antennas
are described, and experimental results of the obtained
dual-band performances are presented and discussed. |
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Title: |
Numerical
solution of longitudinal and torsional oscillations of cylinder
with suction in a couple stress fluid |
Author (s): |
J. V. Ramana
Murthy, G. Nagaraju and P. Muthu |
Abstract: |
The flow of a couple stress
fluid generated by performing longitudinal and torsional
oscillations of a porous circular cylinder subjected to
constant suction at the surface of the cylinder is studied. A
finite difference method is proposed to analyse the velocity
components, in an infinite expanse of an incompressible couple
stress fluid under vanishing couple stresses of type A
condition or super adherence condition of type B on the
boundary. The effects of couple stress parameter, Reynolds
number and the ratio of couple stress viscosities parameter on
transverse and axial velocity components are studied. The drag
force acting on the wall of the cylinder is derived and
effects of Couple stress parameters on drag are shown
graphically. |
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Title: |
Strength of
concrete incorporating aggregates recycled from demolition waste |
Author (s): |
R. Kumutha
and K. Vijai |
Abstract: |
The properties of concrete
containing recycled aggregates were investigated. Recycled
aggregates consists of either crushed concrete (CC) or crushed
bricks (CB) from the demolition wastes available locally.
Laboratory trials were conducted to investigate the
possibility of using recycled aggregates as the replacement of
natural coarse aggregates or fine aggregates in concrete. A
series of tests were carried out to determine the density,
compressive strength, split tensile strength, flexural
strength and modulus of elasticity of concrete with and
without recycled aggregates. Natural coarse aggregates in
concrete was replaced with 0%, 20%, 40%, 60%, 80% and 100% of
crushed concrete aggregates. Natural fine aggregate in
concrete was replaced with 0%, 20%, 40%, 60%, 80% and 100% of
crushed brick aggregates.. For strength characteristics, the
results showed a gradual decrease in compressive strength,
split tensile strength, flexural strength and modulus of
elasticity as the percentage of recycled aggregate used in the
specimens increased. |
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Title: |
Hybrid
modeling and optimization of hardness of surface produced by
electric discharge machining using artificial neural networks
and genetic algorithm |
Author (s): |
G. Krishna Mohana Rao, D. Hanumantha Rao and Anjaneya Prasad |
Abstract: |
The present work is aimed at
optimizing the hardness of surface produced in die sinking
electric discharge machining (EDM) by considering the
simultaneous affect of various input parameters. The
experiments are carried out on Ti6Al4V, HE15, 15CDV6 and M-250
by varying the peak current and voltage and the corresponding
values of hardness were measured. Multiperceptron neural
network models were developed using Neuro solutions package.
Genetic algorithm concept is used to optimize the weighting
factors of the network. It is observed that the developed
model is within the limits of the agreeable error when
experimental and network model results are compared. It is
further observed that the error when the network is optimized
by genetic algorithm has come down to less than 2% from more
than 5%. Sensitivity analysis is also done to find the
relative influence of factors on the performance measures. It
is observed that type of material effectively influences the
performance measures. |
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Title: |
Study on
piezo-damping cyanate modified epoxy matrix glass fibre
composite with lead zirconate titanate |
Author (s): |
Vijaya kumar
K. R. and Sundareswaran V. |
Abstract: |
Mechanical properties of piezo-damping
cyanate modified epoxy matrix glass fibre composite are
investigated under 60% cyanate ester with varied lead
zirconate titanate. The mechanical properties like tensile
strength, flexural strength and fracture toughness are
measured as per ASTM D3039, D790 and D5528 respectively.
Epoxy/glass fibre with 60% cyanate loading (60EPCY) with good
mechanical properties is the system chosen for varying load of
PZT material (0%, 10%, 20% and 30%). Finite element method is
used to measure frequency response, damping factor were
obtained for piezo-damping cyanate modified epoxy matrix glass
fibre composite. |
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Title: |
Simulation
and measurement of very fast transient over voltages in a 245kv
GIS and research on suppressing method using ferrite rings |
Author (s): |
J.V.G.
Rama Rao, J. Amarnath and S. Kamakshaiah |
Abstract: |
Very fast transient over
voltages are generated during the switching of disconnections
in gas insulated substation. Such over voltages can cause mal
functioning of protection circuits and control circuits and
also initiates faults and influence on other components such
as transformers. The suppression of VFTO (Very fast transient
over voltage) is very important in GIS systems. There are some
deficiencies in the existing suppressing methods. In this
paper new idea for the suppressing VFTO by ferrite is put
forward and the computer simulations were conducted on 245KV
GIS models with and without ferrite rings and the results are
verified with the experimental results. The simulation test
results are closely matched with the experimental results so
the use of magnetic rings to suppress VFTO is distinctly
efficient. |
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