WATTIMURY, BARNABAS (2015) ANALISIS DAMPAK KEAUSAN SILINDER LINER TERHADAP GAYA INERSIA MOTOR YANMAR YSM8-Y. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Hasil pembakaran udara dan bahan bakar didalam silinder motor akan
menekan torak dan merobah gerak translasi menjadi gerak putar melalui rangkaian
mekanisme gerak kerja torak, batang penghubung dan lengan engkol. Selama proses
kerja dari rangkaian tersebut, akan terjadi keausan permukaan komponen antara
komponen bergerak yang satu terhadap lainnya,atau komponen bergerak terhadap
komponen diam seperti silinder liner.Pembesaran volume kompresi akibat keausan
silinder liner, sangat berpengaruh terhadap gaya inersia dan siklus kerja motor.Gaya
inersia diperoleh melalui perkalian percepatan torak terhadap masa yang bergerak
translasi sepanjang garis sumbu silinder, sedangkan percepatan torak tergantung dari
kecepatan kwadrat sudut engkol hasil dari kecepatan torak akibat tekanan gas pada
permukaan torak. Perhitungandianalisis dengan metoda Grinevetsky-Mazinguntuk
batas keausanyang diijinkan (wear limit = 0,17 mm), serta volume kompresi setelah
pembesaran silinder liner akibat keausan sebesar 0,25 mm, 0,50 mm, 0,75 mm dan
1,00 mm melewati batas yang diijinkan (umumnya terjadi dilapangan ± 1 mm).
Hasil perhitungan menunjukan, tekanan maksimum dalam silinder menurun
dari sebesar 3,57 kg/cm2 atau 0,27%, daya motor (Ne) menurun sebesar 0,22 Hp atau
0.12%, putaran motor (n), menurun sebesar 101,03 rmp atau 0,315%. Pada perhitungan
dinamika engkol,gaya tangensial dan torsi mesin menurun sebesar 0,99% pada
3750putaran engkol, dan gaya yang bekerja pada poros untuk tiap langkah usaha relatip
menurun sebesar 0.007% pada 3600 dan 3750 putaran engkol. Pada tiap besaran
keausan, gaya inersia orde 1 (f1) yang terkait dengan frekuensi putaran poros secara
keseluruhan menurun rata-rata sebesar 0.937%, sebaliknya gaya inersia orde 2 (f2)
mengalami kenaikan tidak merata pada tiap frekuensi 200 putaran engkol, sedangkan
gaya inersia (F = f1 + f2) tidak mengalami perubahan. ========== Results of air and fuel combustion in the cylinder motor will be pressing the
plunger and changed the translational motion into rotary motion through a range of
motion of the working mechanism of the piston, connecting rod and crank arm. During
the working process of the circuit, the wear surface of the component will occur
between moving parts on one another, or moving parts against stationary components
like cylinder liner. Compression volume enlargement due to wear of the cylinder liner,
very influential on the inertia and the motor work cycle. Inertia force obtained by
multiplying the acceleration of the piston against future translational moving along the
line of the cylinder axis, while the acceleration of the piston depending on the square of
the speed of the crank angle of the piston speed due to the result of the gas pressure on
the piston surface. Calculations were analyzed by the method Grinevetsky-Mazing to
limit the allowable wear (wear limit = 0.17 mm), and the compression volume after the
enlargement of the cylinder liner due to the wear of 0.25 mm, 0.50 mm, 0.75 mm and
1.00 mm past the allowable limit (generally occur in the field ± 1 mm).
Calculation shows, the maximum pressure in the cylinder decreased by 3.57 kg/
cm2 or 0.27%, motor power (Ne) decreased by 0.22 or a 0.12% Hp, motor rotation (n),
a decrease of 101.03 rpm or 0.315%. In the calculation of the dynamics of a crank,
tangential force and torque decreased by 0.99% in 3750putaran crank, and the forces
acting on the shaft relative to each step of the business decreased by 0.007% in 3600
and 3750 revolutions of the crank. At each scale of wear, inertial forcesof order 1 (f1)
which is associated with the frequency of shaft rotation as a whole decreased on
average by 0937%, otherwise the inertial forces of order 2 (f2) increased uneven at each
frequency of 200 revolutions of the crank, while inertial force (F = f1 + f2) unchanged.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Mesin diesel, Siklus kerja motor, Volume kompresi, Gaya inersia, Diesel engine, motor work cycle, compression volume, inertial force. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 11 Jan 2017 07:41 |
| Last Modified: | 24 Aug 2018 07:24 |
| URI: | http://repository.its.ac.id/id/eprint/1491 |
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