networks and telecommunications design and operation
networks and telecommunications design and operation
...
having
needed
to be expanded with extensive
new
sections on data,
broadband and
multimedia
networks and
much extended coverage of
modern transmission
media, radio
and
network management. ... regulators
and
governments.
The sort of people
that
I
hope will
read it and use
it, the interested parties,
are students
and
academics, telecommunications
and compute...
Tài liệu CLUTCHES AND BRAKES Design and Selection
... together the formulas for the
design and selection of a variety of brakes and clutches. The second is to
provide flowcharts and programs for programmable calculators and personal
computers to facilitate ... 301
References 316
Chapter 14 Engineering Standards for Clutches and Brakes 317
I. SAE Standards 317
II. American National Standards Institute (ANSI) 320
III. Other Standards Or...
Clutches and brakes design and selection P1
... processes through overhead cranes,
hoists, and industrial brakes and clutches and in farm and garden tractors.
Some or all of the following materials, and others, that are now nec-
essary to produce ... coefficient is the
design parameter to be used. On the other hand, the pertinent design param-
eters are the dynamic friction coefficient and its change with temperature
when a bra...
Tài liệu Clutches and brakes design and selection P2 doc
... the lining material and the drum, p represents the pressure between
the drum and the lining, and w represents the width of the band. Upon
simplifying equations (1-1) and (1-2) and remembering that ... the element of
band length approaches zero, sin(du/2) approaches du/2, cos(du/2)
F
IGURE
2 Quantities and geometry used in the derivation of the band-brake
design relations.
Band B...
Tài liệu Clutches and brakes design and selection P3 docx
... Inc.
Thislinkforceandtheactivatingmomentbothactonthesecondary
shoe,sothattheforceandmomentequationsofequilibriumforthesecond-
aryshoebecome
F
r
2
¼Àrw
Z
f
2
f
1
pcosfdfþArw
Z
f
1
f
2
psinfdfþF
l
sinf
2
þ
h
2
ð5-7Þ
F
u
2
¼Àrw
Z
f
2
f
1
psinfdfþArw
Z
f
2
f
1
pcosfdfþF
l
cosf
2
þ
h
2
ð5-8Þ
where2histheanglesubtendedbytheadjustinglink.Next,
M
a
2
¼M
p
2
þM
f
2
À2RF
l
sin
f
2
2
sin
f
2
2
þ
h...
Tài liệu Clutches and brakes design and selection P4 pdf
... 4
LinearlyActingExternalandInternal
DrumBrakes
Linearlyactingdrumbrakesarethosefittedwithshoeswhich,whenacti-
vated,approachthedrumbymovingparalleltoaradiusthroughthecen-
teroftheshoe.TypicallinearlyactingdrumbrakesareillustratedinFigures
1–3.
Analysisoflinearlyactingbrakesincludesthoseinwhichthecentrally
pivotedshoesareattachedtopivotedlevers,asinFigure1.Includingbrakes
ofthisdesignwithinthec...
Tài liệu Clutches and brakes design and selection P5 docx
... MI.)
Dry and Wet Disk Brakes and Clutches 87
Copyright © 2004 Marcel Dekker, Inc.
Evaluationoftheseintegralsiseasiestforbrakepadswithradialand
circularboundaries,asinFigure4,forwhichequation(1-4 )and( 1-5)maybe
writtenusingadummyvariablefas
F¼p
max
r
i
Z
A
1
r
da¼p
max
r
i
Z
r
0
r
i
Z
u
0
dfdrð1-6Þ
¼p
max
r
i
uðr
0
Àr
i
Þ
and
T¼Ap
max
r
i
Z
A
da¼Ap
max
r
i
Z
r
o
r
i
rdr
Z
u
0
df
ð1-7Þ
¼...
Tài liệu Clutches and brakes design and selection P6 ppt
... Inc.
II.FOLDEDCONEBRAKE
Prototypeconebrakeshavebeendesignedandtestedforarangeofvehicle
sizes,fromtractorsandtrailerstosubcompactautomobiles[1].Boththelarge
andsmallsizesusedafoldedconedesign,asillustratedinFigures 5and6 ,
eachwitha=27j.Althoughtheconebrakehasfewerpartsthandrum
brakes,thisadvantagemustbebalancedagainstthedisadvantageofrequiring
anoutboardwheelbearing.
Analysisofthefoldedconebr...
Tài liệu Clutches and brakes design and selection P7 pdf
... They are often designed in the laboratory by a
combination of theory and trial and error because our present theory is not
adequate to handle small geometric effects on the electric and magnetic ... Inc.
OMandtheIM.Thebrakeconfigurationdiffersfromtheclutchonlyinthat
theIMisrigidlyattachedtothebrakeframe.
AnelectromagneticcoiloutsidetheOMandconcentricwithitisusedto
activatethebrakeorclutch....
Tài liệu Clutches and brakes design and selection P8 ppt
... Inc.
theannularcaliperandannulardiskbegivenbyequation.Accordingly,eval-
uatetheformulas
T¼p
max
wr
2
o
ð1Àe
ÀAf
Þð8-7Þ
forabandbrake,
T¼2Ap
max
wr
2
o
sin
f
o
2
ð8-8Þ
foreithertwoopposinginternalorexternallinearlyactingbrakeshoes,
T¼2Ap
max
r
3
o
3
ffiffiffi
3
p
f
o
ð8-9Þ
fortwoopposingdiscbrakepads,eachsubtendingangleB
o
,and
T¼4kAp
max
r
3
o
3
ffiffiffi
3
p
ð8-10Þ
fortwocompleteannularpadsinwhichB...
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