04/21/2023 1

A performance comparison between cricket bat designs

CH ANILDepartment of Chemical Engineering

IISc Bangalore

CH ANIL IISc Bangalore

04/21/2023 CH ANIL IISC Bangalore 2

OutlinesIntroductionObjectiveMaterials and methods

Vibration analysisMoment of inertiaBending stiffness

Results and discussionconclusions

04/21/2023 CH ANIL IISC Bangalore 3

IntroductionDesign variations

Efficiency of the shotReduce the effort of

the playerCricket bat

performanceSweet spotStiffnessMoment of inertiaCoefficient of

restitution

04/21/2023 CH ANIL IISC Bangalore 4

ObjectiveTesting of cricket bats performanceEffect of novel designs on physical

properties and performanceSource: T Eptaxiopoulou.et

al,proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 5

Materials Bat Mass(K

g)Blade length(mm)

Blade width(mm)

status

description

Bat 1 1.266 375 106 legal Short blade

Bat 2 1.223 532 108 legal Standard curved profile

Bat 3 1.176 542 106 legal Standard curved profile

Bat 4 1.168 557 108 legal Standard curved profile

Bat 5 1.138 540 108 illegal

Carbon handle

Bat 6 1.164 549 108 legal Standard curved profile

Bat 7 1.212 537 108 illegal

Carbon handleDescription of the bats

Source: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 6

Vibration analysisImpulse hammer technique

04/21/2023 CH ANIL IISC Bangalore 7

Experimental set upSource: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 8

Vibration analysisImpulse hammer techniqueMiniature accelerometerMode shape or vibration modeNode of a vibration modeAccuracy - Coherence function

04/21/2023 CH ANIL IISC Bangalore 9

Moment of inertia

Source: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

Pendulum arrangement for MoI

04/21/2023 CH ANIL IISC Bangalore 10

Contd.The period of a physical pendulum

where

I: moment of inertia of bat d: distance between pivot point and centre of

mass

04/21/2023 CH ANIL IISC Bangalore 11

Bending stiffness

Source: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 12

Three point bending testBending stiffness(EI)Uniaxial material testing

machine( Instron model 5866)

A 1000N load cell

WhereE: Elastic modulus, I:

second moment of areaP: load, L: length between

two supports, w: deflection

04/21/2023 CH ANIL IISC Bangalore 13

Source: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 14

Contd..The size of sweet spot for carbon fiber handle bats(5,7)-----

0.19m for short blade bat(1) -----0.18mTraditional design bats ----0.135 to 0.16m

04/21/2023 CH ANIL IISC Bangalore 15

Bat Mass(Kg)

Distance to CoM (m)

Moment of Inertia(Kg m2)

Bending stiffness (EI) of sweet spot(Nm2)

Bending stiffness(EI) of handle(Nm2)

Bat 1

1.266 0.479 0.3475 901 79

Bat 2

1.223 0.461 0.3131 432 66

Bat 3

1.176 0.485 0.3014 683 39

Bat 4

1.168 0.450 0.2866 661 48

Bat 5

1.138 0.491 0.3220 602 26

Bat 6

1.164 0.449 0.2770 653 42

Bat 7

1.212 0.480 0.3270 610 25Source: T Eptaxiopoulou.et al, proc.IMechE, vol226 part P, J.sports engg. and technology

04/21/2023 CH ANIL IISC Bangalore 16

ConclusionsSeven bats were testedMoI, bending stiffness and vibration

analysis conductedSweet spot area estimatedRedistribution of mass

Moment of inertia increases, increases in coefficient of restitution

Carbon fibers-imparting the maximum energy to the ball

04/21/2023 CH ANIL IISC Bangalore 17

Thank you