国际会议演讲稿 本文关键词：国际会议，演讲稿
国际会议演讲稿 本文简介：1.IntroductionGoodafternoon,Ladiesandgentlemen.Iamhonoredtohavebeeninvitedtospeakatthisconference.IamaPhDstudentfromXXXandcurrentlydoingsomeresearchon
国际会议演讲稿 本文内容：
1.
Introduction
Good
afternoon,Ladies
and
gentlemen.I
am
honored
to
have
been
invited
to
speak
at
this
conference.
I
am
a
PhD
student
from
XXX
and
currently
doing
some
research
on
Instrument
Science
and
Technology.Today,my
topic
is
Conceptual
Design
of
an
Evaluation
Device
for
Power
Test
of
Explosives.The
content
of
this
presentation
is
divided
into
4
parts:
in
section
1,I
will
introduce
the
Research
Status
Quo
of
some
existing
methods
for
power
test
at
Home
and
Abroad;
in
section
2,I
will
give
the
overall
design
and
testing
principle
of
the
device;
the
mathematical
model
and
simulation
results
will
be
showed
in
section
3;
and
finally,I
will
make
a
conclusion.
Before
entering
the
theme,let
s
look
at
what
is
the
power
of
explosives.The
sum
of
mechanical
work
to
surrounding
medium
by
explosion
is
called
power
of
explosives,which
reflects
the
ability
of
the
expanding
gas
produced
by
explosion
and
is
also
an
important
indicator
for
evaluating
the
performance
of
explosives.
2.
Body
Section
1:Research
Status
Quo
at
Home
and
Abroad
These
are
some
existing
methods
for
power
test
of
explosives：
1)
lead-cast
method
2)blasting
funnel
method
3)ballistic
mortar
method
4)underwater
explosion
method
5)ballistic
projectile
method
Let’s
look
at
the
advantages
and
disadvantages
of
two
typical
methods
for
power
test.The
lead-cast
method
is
the
first
standard
method
in
the
world.It
is
easy
to
operate
and
does
not
require
specialized
test
equipment.However,the
little
test
quantity
of
explosives,the
physical
properties
as
well
as
different
manufacturing
processes
of
lead-cast
result
in
a
larger
experimental
error.In
addition,the
lead-cast
is
disposable
and
high
cost,therefore
the
international
community
adopts
the
underwater
explosion
method
as
well.This
method
can
not
only
test
large
quantity
of
explosives,but
also
has
a
good
reproducibility
of
experimental
data.However,the
test
system
of
underwater
explosion
requires
large
initial
investment,complex
experiment,high
test
cost
and
professional
testers.
Therefore,it
is
necessary
to
establish
a
simple,reliable
and
accurate
power
test
method.The
simple
and
practical
evaluation
device
introduced
in
this
presentation
can
realize
the
accurate
and
reliable
measurement
on
power
test
of
explosives.
Section
2:Design
of
Device
for
Power
Test
of
Explosives
Here
you
can
see
a
figure
which
shows
the
schematic
of
the
overall
design
scheme.This
device
can
be
divided
into
three
components.This
part(爆炸腔)
is
used
to
store
and
detonate
explosives;This
part（驻退机、复进机）can
consume
the
energy
generated
by
explosion;The
other
part(连接和承载组件)
is
connection
and
support
component.The
figure
2.2
shows
the
function
of
various
components.
Based
on
the
above
analysis,the
total
energy
generated
by
explosion
can
be
divided
into
the
following
energy:Hydraulic
energy
of
recoil
mechanism,Gas
energy
of
counter-recoil
mechanism,Energy
of
the
remnant
explosion
gas,Friction
heat
and
Other
micro
energy.
Section
3:Mathematical
Model
and
Simulation
Results
The
Mathematical
Model
of
Device
is
based
on
two
Basic
Principles:
1)Thermodynamic
Equation
of
Gas
State
;
2)Newton
s
Second
Laws
of
Motion.
Through
a
series
of
deduction,a
comprehensive
equation
of
the
device
is
obtained.This
is
its
initial
condition.We
can
get
the
value
of
each
parameter
by
solving
the
equation
.
The
figure
3.1
shows
the
change
of
pressure
at
the
just
moment
of
explosion.It
is
the
simulation
results
under
the
condition
of
76.8g[gram]
of
TNT.
Then
solve
the
equation
through
computer,I
get
The
Curve
of
Pressure
and
Motion.From
these
curves,we
can
draw
the
following
conclusions:
The
pressure
value
in
the
explosion
chamber
decreases
rapidly
at
first.
Then
it
decreases
slowly
and
tends
to
be
stable
in
the
end.
The
acceleration
is
very
large
at
first
and
then
decreases
rapidly.
It
does
not
increase
until
the
value
reduces
to
negative.
The
acceleration
tends
to
0
in
the
end.
The
velocity
increases
rapidly
at
first,then
reaches
the
maximum
value.
After
this,it
decreases
slowly
and
tends
to
0
finally.
The
displacement
increases
rapidly
at
first,then
increases
slowly
and
stabilizes
at
around
0.5m
.
The
curves
obtained
from
the
comprehensive
equation
fit
well
with
the
expected
results
and
the
energy
can
be
estimated
by
the
curves.
It
is
proved
that
the
test
principle
of
the
device
is
feasible.
The
equation
established
and
parameters
selected
are
reasonable.
Section
4:Conclusions
To
sum
up,the
evaluation
device
for
power
test
of
explosives
is
designed
based
on
the
principle
of
conservation
of
energy.
It
has
the
advantages
of
simple
operation,high
test
precision,good
repeatability
and
can
be
operated
indoors.
The
device
can
provide
an
effective
evaluation
method
for
power
test
of
explosives
and
has
the
guiding
significance
for
improving
test
precision
of
power
test
of
explosives.
That’s
all.
Thank
you!
Are
there
any
questions?
Compared
with
other
test
methods，what
is
the
advantage
and
improvement
of
your
device？
It
is
a
simple
and
scientific
power
test
method
.Compared
with
other
test
methods，the
device
can
realize
the
accurate
and
reliable
measurement
on
power
test
of
explosives.