We are glad to present the second edition of our departmental newsletter. This year we have incor- porated topics from to bring you closer to recent advancements in ME- CHANICAL ENGINEERING with interviews and can- did talks with HOD and ex -students.we have tried to acquaint you with lesser known aspects of our department. EXCLUSIVE INTERVIEW 2 EXTRA CURRICULAR DEPARTMENTAL REPORT 3 MIT TEXEPHYR 4 MIT TEXEPHYR 5 ALLUMNI INTERVIEW 6 EVENT SCHEDULE 7 Production & Automa- tion:AN INSIGHT 8 Inside this issue: MIT TEXEPHYR ‘14 Scientists have built the first-ever nonreciprocal circulator for sound that is able to break sound wave reciprocity. The device is a 'one- way road for sound' that transmits acoustic waves in one direction but blocks them in the other. With this device, you can listen without being heard. A team of researchers at The University of Texas at Austin's Cockrell School of Engineering has built the first-ever circulator for sound. The team's experiments successfully prove that the fundamental symmetry with which acoustic waves travel through air between two points in space ("if you can hear, you can also be heard") can be broken by a compact and simple device. Using the proposed concept, we were able to create one-way communication for sound traveling through air," said Andrea Alù, who led the project and is an associate professor and David & Doris Lybarger Endowed Faculty Fellow in the Cockrell School's Department of Electrical and Computer Engineering. "Imagine being able to listen without having to worry about being heard in return." This successful experiment is described in "Sound Isolation and Giant Linear Nonreciprocity in a Compact Acoustic Circulator," which will be featured on the cover ofScience in the Jan. 31 issue. An electronic circulator, typically used in communication devices and radars, is a nonreciprocal three-port device in which microwaves or radio signals are transmitted from one port to the next in a sequential way. When one of the ports is not used, the circulator acts as an isolator, allowing signals to flow from one port to the other, but not back. The UT Austin team realized the same functionality is true for sound waves traveling in air, which led to the team's building of a first-of-its-kind three-port acoustic circulator. Romain Fleury, the paper's first author and a Ph.D. student in Alù's group, said the circulator "is basically a one -way road for sound. The circulator can transmit acoustic waves in one direction but block them in the other, in a linear and distortion-free way." The scientific knowledge gained from successfully building a nonreciprocal sound circulator may lead to advances in noise control, new acoustic equipment for sonars and sound communication systems, and improved compact components for acoustic imaging and sensing. "More broadly, our paper proves a new physical mechanism to break time-reversal symmetry and subsequently induce nonreciprocal transmission of waves, opening important possibilities beyond applications in acoustics," Alù said. "Using the same concept, it may actually be possible to construct simpler, smaller and cheaper electronic circulators and other electronic components for wireless devices, as well as to create one-way communication channels for light." This research may eventually allow for an "acoustical version of one-way glass," said Preston Wilson, acoustics expert and associate professor in the Department of Mechanical Engineering. "It also opens up avenues for very efficient sound isolation and interesting new concepts for active control of sound isolators." At the core of the team's sound circulator is a resonant ring cavity loaded with three small computer fans that circulate the airflow at a specific velocity. The ring is connected to three ports outfitted at each end with microphones that record sound. In their experiment, the researchers start by transmitting sound from one port, for example, Port 1. If the fans are off, the sound signal from Port 1 splits symmetri- cally into the two receiving ports, Port 2 and Port 3, as expected. However, when the researchers turned the fans on and delivered a mod- erate airflow into the ring, with specific velocity tailored to the ring design, transmission symmetry was broken and the signal from Port 1 would flow entirely into Port 2, leaving Port 3 completely isolated. Conversely, when a signal was sent from Port 2, it would flow into Port 3, leaving Port 1 isolated. Acoustic signals then flow from Port 1 to Port 2, from Port 2 to Port 3 and from Port 3 to Port 1, but not in the opposite directions. DEPARTMENT OF MECHANICAL ENGINEERING,MIT,PUNE 20th FEBRUARY 2014 THE ANNUAL SCREW To hear without being heard: First nonreciprocal acoustic circulator
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We are glad to present
the second edition of our
departmental newsletter.
This year we have incor-
porated topics from to
bring you closer to recent
advancements in ME-
CHANICAL ENGINEERING
with interviews and can-
did talks with HOD and ex
-students.we have tried
to acquaint you with
lesser known aspects of
our department.
EXCLUSIVE INTERVIEW 2
EXTRA CURRICULAR
DEPARTMENTAL REPORT
3
MIT TEXEPHYR 4
MIT TEXEPHYR 5
ALLUMNI INTERVIEW 6
EVENT SCHEDULE 7
Production & Automa-
tion:AN INSIGHT
8
Inside this issue:
MIT TEXEPHYR ‘14
Scientists have built the first-ever nonreciprocal circulator for sound that is able to break sound wave reciprocity. The device is a 'one-
way road for sound' that transmits acoustic waves in one direction but blocks them in the other. With this device, you can listen without
being heard.
A team of researchers at The University of Texas at Austin's Cockrell School of
Engineering has built the first-ever circulator for sound. The team's experiments
successfully prove that the fundamental symmetry with which acoustic waves travel
through air between two points in space ("if you can hear, you can also be heard")
can be broken by a compact and simple device.
Using the proposed concept, we were able to create one-way communication
for sound traveling through air," said Andrea Alù, who led the project and
is an associate professor and David & Doris Lybarger Endowed Faculty
Fellow in the Cockrell School's Department of Electrical and
Computer Engineering. "Imagine being able to listen without having to
worry about being heard in return."
This successful experiment is described in "Sound Isolation and Giant Linear Nonreciprocity in a Compact Acoustic Circulator," which
will be featured on the cover ofScience in the Jan. 31 issue.
An electronic circulator, typically used in communication devices and radars, is a nonreciprocal three-port device in which microwaves or
radio signals are transmitted from one port to the next in a sequential way. When one of the ports is not used, the circulator acts as an
isolator, allowing signals to flow from one port to the other, but not back. The UT Austin team realized the same functionality is true for
sound waves traveling in air, which led to the team's building of a first-of-its-kind three-port acoustic circulator.
Romain Fleury, the paper's first author and a Ph.D. student in Alù's group, said the circulator "is basically a one -way road for sound. The
circulator can transmit acoustic waves in one direction but block them in the other, in a linear and distortion-free way."
The scientific knowledge gained from successfully building a nonreciprocal sound circulator may lead to advances in noise control, new
acoustic equipment for sonars and sound communication systems, and improved compact components for acoustic imaging and sensing.
"More broadly, our paper proves a new physical mechanism to break time-reversal symmetry and subsequently induce nonreciprocal
transmission of waves, opening important possibilities beyond applications in acoustics," Alù said. "Using the same concept, it may
actually be possible to construct simpler, smaller and cheaper electronic circulators and other electronic components for wireless devices,
as well as to create one-way communication channels for light."
This research may eventually allow for an "acoustical version of one-way glass," said Preston Wilson, acoustics expert and associate
professor in the Department of Mechanical Engineering. "It also opens up avenues for very efficient sound isolation and interesting new
concepts for active control of sound isolators."
At the core of the team's sound circulator is a resonant ring cavity loaded with three small computer fans that circulate the airflow at a
specific velocity. The ring is connected to three ports outfitted at each end with microphones that record sound. In their experiment, the
researchers start by transmitting sound from one port, for example, Port 1. If the fans are off, the sound signal from Port 1 splits symmetri-
cally into the two receiving ports, Port 2 and Port 3, as expected. However, when the researchers turned the fans on and delivered a mod-
erate airflow into the ring, with specific velocity tailored to the ring design, transmission symmetry was broken and the signal from Port 1
would flow entirely into Port 2, leaving Port 3 completely isolated. Conversely, when a signal was sent from Port 2, it would flow into
Port 3, leaving Port 1 isolated. Acoustic signals then flow from Port 1 to Port 2, from Port 2 to Port 3 and from Port 3 to Port 1, but not in
the opposite directions.
D E P A R T M E N T O F M E C H A N I C A L E N G I N E E R I N G , M I T , P U N E
20th FEBRUARY 2014
THE ANNUAL SCREW
To hear without being heard: First
nonreciprocal acoustic circulator
We got into talks with
our HOD, Founder &
Jt.Managing Trustee
Of MAEERs MIT, Pune
and found what he
thinks about this
technical
amalgamation, future
expectations and his
bond with the
department of
Mechanical
Engineering.
1.Sir,how do you feel about the collaboration?
My opinion is that, this is an excellent effort and the working of all the four
departments is not disturbed separately for 6 days and there is a synergy of
the four departments, which shows a good amount of cooperation between
all the departments. Congratulations ,to the students for taking such an ini-
tiative.
2.What does TEXEPHYR mean to you?
In present day’s scenario these events gives an opportunity to the students
to exhibit their talent in addition to academics. These events will improve
the employability of our students.
3.Five years down the line, what are your expectations regarding
TEXEPHYR?
Five years down the line, the technical content of this event should have a
predominance in the programme.As this is not a fun fair but instead a tech-
nical event which gives an opportunity to the students for innovation.
4.How close is the Mechanical Department to you?
I, being one of the founders of MIT, and closely associated with the pro-
gress of Mechanical Department I feel that am very proud to be on the fac-
ulty of the department. We have an excellent infrastructure in the depart-
ment ,as many as 13 well equipped laboratories.Such as tribology, robot-
ics, non conventional energy, computational fluid dynamics and many
more.
5.Words of advice for the students.
Today’s world is very competitive in addition to excellent academics ,one
should have other qualities such as the capacity to lead a team ,work in a
team, good expressions, pleasant personality and willingness to hear atten-
tively.
6.In what ways is this event beneficial for the students ?
This year four departments are joining to organize this technical event
which will help the students to showcase their talent on a bigger platform,
which in turn will help all the departments of MIT to join their hands and
utilize all the resources in future to make this event a great success.
7.Sir,would you like to share your views on SAE committee of SAE MIT
Collegiate branch.
SAE MIT Collegiate branch has been given the branch status due to the
excellent performance of our club. Ours is the only department which has
been given the branch status in the western region of India. This is due to
untiring efforts of our students and faculty members.
I wish all the best to the students and a great success for this event!
Frankly Speaking With
Prof.P.B.Joshi
MIT TEXEPHYR ‘14
Page 2
Page 2 THE ANNUAL SCREW
TEAM PIRANHA RACING
Baja SAE is an inter collegiate design competition run by
the Society of Automotive Engineers (SAE). The goal in
Baja SAE racing is to design , build and race off-road vehi-
cles that can withstand the harshest elements of rough ter-
rain. Team Piranha has a history of participating in Baja
SAE India from the past four years. The team has seen
some tough years and some memorable ones. 2012 was one
of those memorable years when the team secured 6th posi-
tion in the endurance race and 18th rank overall. Even after
being 35 minutes down in a 4 hour race and starting the
race with 3laps down, the team covered about 35 laps of
that dirt track and stood 6th. In 2013 the car was top 3 in
aesthetics and was displayed in the inaugural event. Team
Piranha racing was the only team to clear all technical in-
spections in one go which is no mean feat as the inspections
are precise and thorough conducted by officials from top
car companies .We were one of the very few teams who
experimented with Continuously Variable Transmission
(CVT) instead of Manual Transmission. We also cleared
the gruelling hill climb of 50 metres with a gradient of
40°.Overall Team Piranha Racing stood 16th in endurance.
We have high hopes for 2014, and thank the department for
their continued support and guidance.
SAE STUDENT COUNCIL ‘13 SAEINDIA COLLEGIATE BRANCH
SAE is the acronym for the Society of Automobile Engineers. SAE international is
an organization of over 84000 engineers, educators and associates from over 97
countries. Founded in 1905, SAE is the leading authority in technical information
and expertise used in designing, building, maintaining and operating land, air and
sea vehicles. The collegiate branch of SAE is in charge of organizing various semi-
nars, guest lectures, industrial visits and workshops. It acts as a direct link between
the students and the industry. SAE has a large number of members within the de-
partment. All members benefit from these privileges and opportunities. Along with
this, the members are also entitled to access ARAI`s vast library`s for any educa-
tional or research work. Another major task of the SAE collegiate branch is the total
organization and conduction of TEXEPHYR, the ANNUAL college Techfest. This
large scale festival is completely organized by the students with only a guiding
hand from the faculty. Students not only realize and hone their sense of creativity
but also understand various elements of management, organizing, accounting and
budgeting
TEAM ACCELERACERS
Team Acceleracer`s is a racing team of students
who develop formula style race cars. Acceleracer`s
is a group where imagination, engineering, creativ-
ity and team work thrive together. The team par-
ticipates in various formula student competitions.
The first experience of the team was Supra SAE
India 2011. Initially a team of 24 students, Team
Acceleracer`s is now a union of 50 members from
different streams of engineering, who do a contin-
ual research and development in the field of auto-
mobiles. The working style of the team is more like
that of an organization than a regular college team.
Along with focusing on engineering of the vehicle,
the team also helps students explore their manage-
ment and marketing skills. The last year was a
great year for our college as Team Acccleleracers
were awarded numerous accolades including 1st
place in Engineering Design and 3rd place in Mar-
keting Presentation. High hopes are pinned on the
team to raise the bar to new heights and come back