vib 1
TRANSCRIPT
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Mechanical Vibration (LAB)
Department of Mechanical
EXPERIMENT NO. 1 TORSIONAL VIBRATION
1.1 Objective 1.2 Apparatus Required 1. !heor" 1.# $rocedure 1.% Observations
1.& 'alculations 1.( 'omments
1.1 OBJETIVE!
"
Determination of the period of torsional vibration as a function of) !orsion *ire length
!orsion *ire diameter
1.# A$$arat%&'Part&!
Rods of different diameter
2 chuc+s
Disc, Ring
'huc+ -e"
1. TEOR*!
Tor&ional +ibration!
is angular vibrationof an object commonl" a shaft along its ais of rotation.
!orsional vibration is often a concern in po*er transmission s"stems using rotating shafts or
couplings *here it can cause failures if not controlled.
!o find out various aspects of torsional vibration the follo*ing formulas can be used and the" can
be verified b" relating theoretical and eperimental time period of vibration.
/ormulas)
!theo 0 2 I
Kt
Moment of inertia)
0 m.3D2425
http://en.wikipedia.org/wiki/Vibrationhttp://en.wikipedia.org/wiki/Power_transmissionhttp://en.wikipedia.org/wiki/Power_transmissionhttp://en.wikipedia.org/wiki/Vibration -
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Mechanical Vibration (LAB)
Department of Mechanical
m) mass of disc 3+g5D) diameter of disc 3m5
!orsional stiffness)
Kt=
G IP
L
6) Modulus of rigidit" 374m25 3for 8.8 9# its value is (9. 6pa5:) :ength of shaft 3m5
$olar moment of inertia)
IP=
32d
4
d) diameter of shaft
TENIAL ,ATA!
Tor&ion -ire&!
:ength) 1199mm
Diameter) 2mm, mm, #mm, %mm, &mm
,i&c!
Diameter) 1&9mmMass) #.#+g
Rin!
Outer Diameter) 1&9mm
nner Diameter) 199mmMass) 2.#1+g
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Mechanical Vibration (LAB)
Department of Mechanical
;ase
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Mechanical Vibration (LAB)
Department of Mechanical
1.% Ob&er+ation&!
Sr.
Lenth
o2 &ha2tL (3)
Ti3e ta4en 2or 56 o&cillation& t (&ec)
Perio0 o2 +ibration
(&ec)
t1 t# t t/ t5 t3Te7$
(t3'56) Ttheo
1
#
/
1.8 S$eci3en alc%lation!
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Mechanical Vibration (LAB)
Department of Mechanical
1.9 o33ent&!
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Department of Mechanical
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