Soal Diameter Poros.docx

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HIDRO DEVIASI.xlsx

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TUGAS ELEMEN MESIN I

MENGHITUNG DIAMETER POROS Oleh: Uhandani

3331150052

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JURUSAN TEKNIK MESIN

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[Soal Diameter Poros]

Diketahui sebuah pompa digerakkan dengan menggunakan motor listrik berday

350 kW serta putarannya 800 rpm, bila poros memiliki te gangan geser maksimu

dari bahan baja sebesar 420 MPa. Panjang total poros 1000 mm, dengan kedu ujung poros ditumpu oleh masing-masing satu bantalan, dengan beban masing

masing 300 N dan 600 N diletakkan pada poros dengan jarak masing  –  masing 20

mm dan 300 mm dari sisi tepi poros. Tentukan besar diameter poros yang sesuai! Diketahui :

Asumsi Safety factor = 7 P = 350 kW n = 800 rpm τmax

= 455 MPa You're Reading a Preview

Ditanya :

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d=? Download With Free Trial

Jawab :

600 N

300 N 1000 mm

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 300 mm

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 Not useful 200 mm

RA RB

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∑ =0



= (-600) -300 + 420 +RA RA = 480 Maka beban yang digunakan yaitu RA

= 480000 N.mm

Tegangan ijin minimun

τmax   MPa = 7

Torsi Ekuivalen

τ =

√ ² + ²

Te = =

= 65 Mpa

√ 5024000² + 480000²

Torsi

= 5046877,847 N mm

 = P. 6 W . 6 = 3 .   = 5024 N.m

You're Reading a Preview  Diameter poros pejal

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 =  16.τTe

= 5024 x 10 3 N.mm =

 Momen Lentur

7 N.mm  16  677, .6 MPa



= 73,411 mm

M=FxL = RA x L

 Diameter poros standar

= 480 N x 1000 mm

d = 73,411 mm

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≈ 75 mm

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