welcom to kom lecture
Myself P.Senthilkumar, Faculty in mechanical Engineering
In this lecture , we are going to discuss about four bar mechanism
The main objective of this lecture is
To understand the working methodology of four bar mechanism
The specific objectives are
1. To explain the working of four bar mechanism
2. To classify the various types of four bar mechanism
3. To show the application of fourbar mechanism in beam engine & coupled rod of locomotive
4. Finally, to find the velocity component of four bar mechanism
Let me explain the application of fourbar mechanism in a car.
when i press wiper lever,it actuates motor
which create oscillating motion on windshied
Now my question is How does it work?
I mean the motor create rotary motion but at the output we are getting oscillating motion
There is an arrangement between the motor and wiper
That arrangement converts rotary motion of motor into oscillating motion of wiper at the output
That arrangement is noting but four bar mechanism
The purpose of four bar mechanism is
to convert rotary motion of motor into oscillating motion of wiper at the output.
Specific objective 1
To explain the working of four bar mechanism
This is an arrangement of four bar mechanism
This is the working model of four bar mechanism
Here the rotary motion of crank converted into
oscillating motion of rocker at the output
with the help of connecting rod
Link 1 frame which is fixed
Link 2 crank
Link 3 connecting rod
Link 4 rocker
The simplest and basic kinematic chain is four bar chain.
Here the degree of freedom is n=1
Thats why it is called simple mechanism
Grashofs law states that
Sum of the shortest and longest link
should not be greater than sum of remaining link
Let us consider a four bar diagram
shortest link AD
Longest link BC
This is the condition to be satisfied for four bar mechanism
Specific objective 2
To find various inversion of four bar mechanism
Inversion is an process of obtaining
different mechanism by fixing different link
There are 3 possible inversion
The name itself give meaning ' crank lever
crank act as input, lever act as output
two crank make complete rotation
here two link act as lever
let me show the simulation of four bar mechanism
& its inversion
In this arrangement, add pin joint and motor on respective place
Fix link1
This is the simulation of four bar mechanism
Fix green link instead of blue link
You can see an double crankmechanism
i mean two link will make complete rotation
like this
Similarly you can fix link3
when you fix link 4
you can see rocker rocker motion
i mean two link will make oscillating motion
These are the 3 possible inversion in four bar mechanism
specific objective 3
To show the application of four bar mechanism in beam engine and locomotive
This is the arrangement of beam engine
Let me show you the working model of beam engine
in this model,this is link1,and this is link 2.
link3,link 4
when i rotate crank about fixed point
the lever oscillate about this point
Meanwhile slider slide inside the cylinder
This is the working of crank lever mechanism
i mean beam engine
The purpose of this mechanism is
to convert the rotary motion of crank into sliding motion of slider inside the cylinder.
Coupled rodof locomotive
This is an arrangement of coupled rod of locomotive
when crank1 at wheel 1 rotates about fixed point
the crank2 at wheel 2 will also rotate with the help of
connecting rod
The purpose of this mechanism is to
convert roary motion of one crank into another crank
The distance between two point is fixed,
in order to maintain a constant distance between wheel
thats why this mechanism is commonly used in locomotive
specific objective 4 is
to resolve velcotiy component for four bar mechanism
Let us consider a four bar mechanism like this
ABCD
Now apply law of relative velocity
velocity always perpendicular to link
Draw Vba
Perpendicular to BA
Draw Vcb
Perpendicular to CB
Finally draw Vcd
Perpendicular to CD
first move blue color line
next move
green colorline
finally move orange color line
by measuring length of these line
we canfind velocity of individual component
stimulating question
Identify the type of mechanism used in following toys
The answer is double crank mechanism
it act as double crank
oscillating body
The floor act as fixed link
link1
link 2
link 3&4
when i fix oscilating body
it simply make rotary motion
you can see it simply make rotary motion like this
let me show you once again
double crank mechanism
a type of four bar mechanism
There are lot of mechanism used in toys
This is one example for walking mechanism
used in toys
i will show you one more example
walking mechanism using cam
In real world,you can find lot of mechanism like this in toys.
let me conclude todays lecture
today we discussed about four bar mechanism
in that ,first we discussed about different terminology
along with grashof law
then we disccused about
inversion of four bar mechanism
crank rocker
rocker rocker
and douple crank mechanism
then we discussed about
application like
bema engine and coupled rod of locomotive
finally we discussed about
kinematic analysis of four bar mechanism
Next class, we are going to discuss about slider crank mechanism
Thank you
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breakingnews today
welcome to USA breaking news today please subscribe and click notification
box to get all breaking news alert breaking news today u.s. weapons stocks
sink as macron cools Trump's temper over Iran defense firms are shedding value
after President Donald Trump and French President Emmanuel macron cooled the
prospect of intervention after talking openly on the grave international
situation in North Korea and the Iran nuclear deal dot the value of companies
that might benefit from US intervention abroad dipped as President Trump praised
North Korea dictator Kim jong-un as honorable and open as such the S&P 500
aerospace and defense index comprised of 13 manufacturers closed down more than
3% shares of defense companies tend to soar against the broader market when the
United States takes military action in the Middle East however they also sink
when the tensions dropped from the boil to simmer President Trump is seeking
denuclearization of the secretive regime but the world is watching on as leaders
pursue an unprecedented us North Korea summit in May or June while concerning
Iran French president Emmanuel macron used his White House meeting to call for
a new Iran nuclear deal that will build on the current agreement with Tehran
following talks with US president Donald Trump mr. maker on said the pair had
frank discussions on the landmark 2015 pact which the united states president
has previously described as insane the french president said together and with
the powers of the region and iranian leaders we need to find a deal this is
the only way to bring about stability on Wall Street Lockheed Martin Corp the
Pentagon's number-one weapons supplier known for the US military's
top-of-the-range f-35 lightning ii fighter jet closed down more than 6% at
336 dollar and 49 cents yesterday Lockheed Martin is the biggest earner
from the US federal government and receives on average around 10 percent of
the funds paid out by the Pentagon in 2009 US government contracts accounted
for thirty eight point four billion dollars eighty-five percent
of its yearly earnings despite Lockheed reporting a better than expected
quarterly profit and raised its full-year forecast the company's shares
fell 6.1 percent amid a broader market sell-off after yesterday's talks between
mr. Makran and president Trump supporting the effect on defense stocks
of the downgrade in global tension Peter Armand an aerospace and defense
industry analyst at Baird told CNBC we are not seeing anything in the earnings
reports that warrants this kind of weakness since assuming office President
Trump has sought to solidify the u.s. as the dominant force in the trade of
global weapons as global tensions rise in Syria and North Korea president Trump
wants to make it easier to put american-made weapons into the hands of
US allies and partners cutting through the red tape the Trump administration's
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export policy allows US firms to directly sell some types of conventional
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through the US government in an attempt to boost US jobs and Industry president
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according to William Hartung director of the arms and Security Project at the
center for international policy it's keeping with what they've been doing he
told CNN there is a lot of emphasis on jobs and much less on human rights and
other concerns thanks for watch please share like
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