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Andımız Marşı Kaldırıldı Mı? ᴴᴰ - ATATÜRK GERÇEĞİ..! - "Gündem Video" - Duration: 4:47.
For more infomation >> Andımız Marşı Kaldırıldı Mı? ᴴᴰ - ATATÜRK GERÇEĞİ..! - "Gündem Video" - Duration: 4:47. -------------------------------------------
Video Final Year Project - Duration: 15:00.
hi my name is Deep Das Gupta and my final year project is about controlling
fisher valves wirelessly and so this is just some background information on how
I did things and so the way this idea generated was that I did my internship
with Western process control which is a valves manufacturing company and loved
every second of it just the applications of valves and working on them and my
Instinct was to continue this industry this is my final year project so I spoke
with my manager and one day he said that there's this really cool Wireless
project going and just some background information Fisher valves they usually
control through a wide connection where you put a current signal in 4 to 20
milliamps usually whereas this system solely revolves our around a wireless
system using two pieces of hardware called the gateway and the fastest of
the Gateway is almost like a like an antenna which receives wireless heart
signals and the thumb is the transmitter which transmits whilst heart signals so
without further ado let's get back into things so while it's control of fisher
valves first of all I'm just going to go through some background information just
so that everyone knows what we're talking about what is a control valve so
a control valve is an electronically powered device and the main job of a
control valve is to open and close such that fluid is either restricted or it is
completely lit through and a typical example of the control valve is shown
here where we have a tank of water and we want to control for the level of
water in tank so the that level cannot go beyond these two levels here and so
the system what happens here is that water is constantly coming into the tank
but it's also being drained out by these control valves and the rate at which
it's being drained out is such that the level of water in the tank always
remains within these levels this is just a typical control valve scenario but
control valves can be used anywhere where you want to keep a certain
variable constant now just some background information on how control
valves valves typically work so for example here what happens usually is
that a current signal is chucked into the into the valve
for example a four milliamp input is put into the positioner here which fully
opens the valve meaning that all fluid goes through whereas here the twenty
milliamp signal was put in which means that the control valve completely shuts
and it blocks all fluid going through this this is just show that inputs in
between 4 to 20 mili-amp actually like open and close the valve proportionately
so for example an 8 milliamp input will move the valve to 25% 12 milliamps to
50% and 16 million ohms to 75% and etc etc so why go wireless and move away
from this traditional way of controlling a control valve some of the main real
benefits are that the first one is every valve gets a feedback loop in the
industry not a lot of Valve's get a feedback loop going because of the cost
of wiring however with this wireless network every valve gets a feedback loop
second of all there's no cost of wiring involved here which really does
eliminate a lot of overhead no PLC or dcs system required here only c-sharp
and visual studio and one of the most important things is that when you
perform valve Diagnostics when there is in fact something going
wrong with the valve you'll know about it straight away whereas in industry
this often takes hours to pick up so this is the wireless solution and the
wireless solution is composed of four integral parts which will briefly
discuss as a top level view and then go into a little bit more detail later so
the first part is actually establishing a wireless network and this will be done
mainly using the thumb and the Gateway and the thumb as you know is the
transmitter and the Gateway acts like the antenna and so the thumb transmits
information about the valve to the Gateway which is then read in from the
Gateway to the computer using tcp/ip connection using an Ethernet cable the
second part of this project is actually getting the valve to move wirelessly so
what we are dearly want is to chuck in a value in the computer and based on this
value the valve moves to a certain position so the way that's going to
happen is that we're going to use a software so visual studio in order to
change a parameter in the Gateway which will
then be received by the thumb and once it's received by the thumb the valve
will move once we have the valve responding wirelessly the third thing we
want to do is display in some sort of external stimuli case so this external
stimuli could be like water level pressure transmitters anything that
varies over time and as this stimuli varies over time the valve will respond
according to these variations last but not least we want to close the loop for
the system and so somehow the valve will open and close and based on this the the
variable will be fed back into the loop this is just to show that the valve will
respond the way it should respond in the plant now we're gonna go a little bit
deeper into part one of the wireless network which is actually establishing
the wireless heart Network so firstly just some background information about
the heart protocol the way the heart protocol works is that you have a DC
value as shown here and then you superimpose an AC signal on this DC
signal and based on the frequency of this AC signal you either transmit a 1
or a 0 so 1200 Hertz is a 1 and 20 200 Hertz is a 0
the main benefit of this is that most things are controlled through a 4 to 20
milliamp DC signal but this goes on top of this signal and therefore no extra
wires or protocols is required besides this one and this is just some usually
the package structure of the heart protocol so in the things that we
require to set up a wireless heart network is that firstly the Gateway it
needs to be set up into a local area network using the tcp/ip local area
network protocol after that the thumb must be connected to this network using
the join key and a network ID and then once this is done the connection is
established and you can use AMS device manager to make sure that everything is
running smoothly as you can see here the connection is good and it's ready to go
so once the connections being established these are some of the
results that you can get so for example here
you have the primary variable variable this is just basically the amount of
current going in this set point of the valve this looks like the pressure of
the valve and again the travel these are typical tests that can be carried out
with valves so for example this is the dynamic test and usually the dynamic
test opens the valve from 0% all the way the hundred percent and then goes back
down from hundred percent to zero percent and key things that we sort of
look for usually are the spikes here which means that the valve has been put
together properly this is a step test and it and it's one of the crucial tests
that the valve needs to pass in order to be used in industry where incrementally
again opens the valve and closes it but in very short steps and this way within
we can check the maximum deadband and if this deadband is below two then we quit
the second part of this project consists of controlling the valve wirelessly and
in this part we're gonna go into a bit more detail as to how we did that so
first of all we use the Modbus protocol to control the valve wirelessly so the
Modbus protocol is basically just a bunch of registers that devices can read
to and write to so the Modbus master can write and read from these registers
whereas the Modbus slave can only read so for example in this circumstance
we're going to use one of these registers here one of the readwrite
registers which we can alter and the Modbus master is going to be our
computer and the model our slave is going to be the gateway so the first
thing we're going to do is that when the thumb transmits information about the
valve back to the gateway it transmits one very important piece of information
which is the travel setpoint so firstly we're going to chuck this travel
setpoint into register 40,000 and two which is one of the readwrite registers
in the Gateway once this is done we can then use a Modbus master which is the
computer to connect to the Gateway using the TCP port and write to this register
40,000 and to the travel setpoint so in this example here we write there 50 to
register 40,000 and to and when the thumb reads this information the valve
moves to 50%
so now that we have the valve controlling wirelessly the next step is
to show the valve responding to some sort of real-world parameter and the
real-world parameter that we chose in this case was actually light so the
first sort of step is to build a light sensing circuit in the hope that the
incident light is shown on this photodiode based on the amount of
incident light the valve will move to a certain position so for example if
incident light is held at typical room incidence then the valve is at 0% and if
there's quite a lot of incident light on this photo Diet than the valve moves 200
percent so the first thing we do is we use a photodiode which outputs
approximately 200 to 400 millivolts into a piece of here
which is then fed into the computer so this circuitry here is actually inbuilt
into the piece op which has been coded in the to the 400 millivolts gets
amplified by a normal amplifier and it generates a count value according to the
amount of voltage that amplifies and this count value is then written onto a
serial port by the UI which can then be read into by a computer
so once the counter value is being written into the serial communication
port c-sharp visual studio is used read this value in and that this gives you an
indication of how much light is being shown on the photodiode so for example
if there's no light being shown the counter values approximately three
negative three thousand or as if there's quite a lot of intensity on the
photodiode than the counter values about three thousand and so now putting it all
together we have the light going to the photodiode the current is being
generated by the photo dye which goes into the P sock this is this is written
into a serial comport which is then read by the visual studio and then based on
this counter value it communicates to the gateway through Modbus changes the
setpoint register which is then and the valve moves to the desired position and
here's a video of it actually working in real life red by the thumb
the fourth and final part of this project is about controlling for a
certain variable and this variable in our case is life so the proposed
schematic is as follows firstly you shine a torch truth of control valve and
based on the amount of incident light on the photodiode the valve moves to a
certain position once the valve moves to a certain position it blocks the amount
of light through the diode and this creates a closed loop system however
unfortunately we did not get this to work completely due to the following
reasons so firstly we had some time restrictions with the resources also the
response time for the valve was actually quite slow it was around 2 seconds which
is especially not ideal I would say when it comes to something like light which
is very sensitive to little movements although there are some key benefits to
the wireless solution there are some limitations that should be taken into
consideration especially if you're looking to place this other system in a
plant so the first one is that connection can be lost between the thumb
and the Gateway due to barriers that may disrupt the system the second one is
that the response time for the control valve is actually quite slow it's about
two seconds and this is not ideal for stimuli that's changing rapidly whereas
you could probably get away with using this for tank level control or software
control by the end of the project I think my most triumphant moment was when
I first got them valve to move wirelessly especially because I'm not a
lot of people in industry I think know how to do that also some of the
difficulties that I had to face throughout the project were firstly the
fact that I often didn't know what to do next just because it wasn't stated in
the manual or and the guidance was quite limited which really forced me to think
on my feet and be resourceful second thing is integrating the light
circuit into into the wild heart network was quite tricky I know James and I
discussed just buying a fancy device that slide it straight in but this was
quite tricky and that made me a better engineer I think and also at the end one
of my most moralizing moments I would say was when I went back to WPC
and everything was just demolished no connections were set up and all the
connections had to be I guess remade and and then the lights that could have to
be put in so based on these key difficulties some of the key things I
learned were when you ask for resources always think carefully before giving how
many hours you needed for how many days you needed for and what you need also
test as much as possible before using the the resources often little things
like you know counter values and things like that and issues with them can be
forcing a lot before and also the most important thing I think is give up you
don't give up no matter what even when you don't know what to do next because
somewhere another things will work out if you keep trying and keep your head
high so that concludes my project
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Funny German Shepherd Compilation #4 - Funny Dogs Video - Duration: 10:01.
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Un video social revela más detalles sobre el caso del novio de Sharis Cid - Duration: 3:05.
For more infomation >> Un video social revela más detalles sobre el caso del novio de Sharis Cid - Duration: 3:05. -------------------------------------------
Funniest Daddy Makes Baby Laugh Moments - Cute Baby Video - Duration: 4:18.
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