JJ311 MECHANICAL OF MACHINE CH 1 HOIST

 JJ311 - HOIST HOIST

CASE in Hoist 1. Case UP 2. Case DOWN 3. Case FREEL FREELY Y RE RELEASED LEASED

Case UP a – Acceleration mL = Mass for Load Motion

1st Step : FBD for Load P

Lifting Machine / Drum

a LOAD a Motion

LOAD

ma mg

P = Force

!D Step : FBD for Lifting Mac"ine Mac"ine # Motion Lifting Machine / Drum

$

Pr

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Case DO%! a – Acceleration mL = Mass for Load Motion

1st Step : FBD for Load P

Lifting Machine / Drum

ma LOAD a Motion

LOAD

a mg

P = Force

!D Step : FBD for Lifting Mac"ine Mac"ine Motion

$

Lifting Machine / Drum

#

Pr

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Case For #&o Load + : #"e tor,-e of t"e t"e dri.er to raise t"e mass mass of '()g &it" acceleration /0ms

Motion Lifting Machine / Drum

a a

Motion *()g

'()g

a – Acceleration mL = Mass for Load

nd Step : FBD for Load *( )g

P = Force

P ma

1st Step : FBD for Load '( )g *()g P

a a '()g ma mg

mg

2rd

Step : FBD for Lifting Mac"ine # Motion Lifting Machine / Drum

$

Pr

P1r

*+,&

*/,&

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Case Fee%0 Re%ease e%ease" " *1

Lifting Machine / DrumA

1st : Motion  Ten&o  Ten&o %oa" ana %a&i eat #nt# tent#an aa) &ean otion /,4+,

a a

Motion *()g

'()g

a – Acceleration mL = Mass for Load

nd Step : FBD for Load *( )g

P = Force

P a

1st Step : FBD for Load '( )g *()g P

ma ma '()g a mg

mg

2rd

Step : FBD for Lifting Mac"ine

$

Motion Lifting Machine / Drum

#

Pr

P1r

*+,&

*/,&

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Case Fee%0 Re%ease" *2 * 2 9. A 66,& %i$t %i$t is s#s5en s#s5en"e" "e" at t)e t)e "# o$ o$ a )oistin& )oistin& a()ine :)ee t)e ass o$ t)e "# 1/6&; a"i#s o$ &0ation is 83,; "iaete o$ t)e "# is <6, an" =(tion to>#e is 1.36N. I$ a BALA!C$!5 MASS OF 1st : Motion 13(65 is #se" in t)e )oistin& s0ste an" t)e %i $t %i$t Aa) &eaan 5a"a 66,& en7a"i Lifting e atas te"a5at 7isi ian& Machine :it) nee"s to ta?e% #5:a" / Drum *a%an(in& ass18,& 2 an a((e%eation o$ 1.6s . Deteine t)e "i?in& to>#e e>#ie". a a

Motion 44()  g

13()  g

a – Acceleration mL = Mass for Load

nd Step : FBD for Load *( )g

P = Force

P a

1st Step : FBD for Load '( )g 44()g P

ma ma 13()g a mg

mg

2rd

Step : FBD for Lifting Mac"ine

$

Pr *66,&

Motion Lifting Machine / Drum

#

P1r *18,&

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