Susilo, Arif Joko (2016) Analisa Dan Pemodelan System Variable Valve Timing Pada Engine Four Stroke 100 CC. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sepeda motor merupakan kendaraan yang banyak
digunakan saat ini. Sepeda motor dapat berjalan karena adanya
proses pembakaran di dalam silinder. Dalam proses pembakaran
tersebut salah satunya melibatkan mekanisme katup. Pada saat
proses pemasukan bahan bakar dan udara pada silinder, katup
intake membuka disebabkan oleh putaran camshaft. Putaran
camshaft tersebut berasal dari gerak translasi piston yang
memutar crankshaft. Saat camshaft berputar menyebabkan
pelatuk katup terdorong sehingga katup membuka. Disaat putaran
crankshaft rendah bukaan katup intake penuh kemudian disaat
putaran crankshaft tinggi bukaan katup intake penuh juga. Maka
dari itu tugas akhir ini bertujuan untuk memodelkan bukaan
katup berdasarkan putaran crankshaft. Sehingga disaat putaran
crankshaft rendah bukaan katup intake rendah namun disaat
putaran crankshaft tinggi bukaan katup intake tinggi atau disebut
variable valve timing.
Metode perencanaan bukaan katup dibahas dan
disimulasikan dengan menggunakan bantuan Software Lotus
Engine Simulation (LES). Pertama melakukan pengumpulan data
spesifikasi engine dan data study eksperiment. Selanjutnya
membuat model standard dengan maximum valve lift 5,5 mm dan
melakukan verifikasi dan validasi. Kemudian membuat model
perbaikan dengan memvariasikan maximum valve lift. Variasi
maximum valve lift terdiri dari 3 variasi yaitu Variasi 1 dengan
maximum valve lift 4,5 mm dan 5,5 mm, Variasi 2 dengan
maximum valve lift 5,5 mm dan 6,5 mm, Variasi 3 dengan
maximum valve lift 6,5 mm dan 7,5 mm.
Dari penelitian pengaruh 3 variasi maximum valve lift
tersebut disimpulkan bahwa untuk putaran crankshaft dibawah
7500 rpm memakai model standard dengan maximum valve lift
5,5 mm dan untuk putaran diatas 7500 rpm memakai variasi 3
dengan maximum valve lift 7,5 mm dengan peningkatan
performance engine rata-rata untuk Torsi sebesar 9,46%, Daya
Efektif sebesar 9,68%, Tekanan Efektif rata-rata (bmep) sebesar
9,48%, Pemakaian bahan bakar spesifik (bsfc) sebesar 1,9 % dan
Efisiensi Thermal sebesar 5,24 %.
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The motorcycle is a vehicle which is widely used today.
Motorcycles can be run due to the combustion process in the
cylinder. In the combustion process is one of them involves a
valve mechanism. At the time of importation of fuel and air in the
cylinder, the intake valve opening caused by the rotation of the
camshaft. The camshaft round came from translational motion of
the piston rotating crankshaft. When the camshaft rotate causing
the trigger valve driven so that the valves open. Low crankshaft
rotation when the intake valve opening is full and then when
crankshaft rotation higher intake valve opening full well.
Therefore this thesis aims to model the valve opening by rotation
of the crankshaft. Low crankshaft rotation so that when the intake
valve opening is low but high crankshaft rotation when the intake
valve opening height, or so-called variable valve timing.
Valve opening planning methods are discussed and
simulated with the help of Software Lotus Engine Simulation
(LES). The first data collection engine specification data and
study experimental. Next create a standard model with a
maximum valve lift of 5.5 mm and verification and validation.
And then create an improved model by varying the maximum
valve lift. Maximum valve lift variation consists of three
variations of Variation 1 with a maximum valve lift 4.5 mm and 5.5 mm, the variation 2 with a maximum valve lift of 5.5 mm and
6.5 mm, the variation 3 with a maximum valve lift of 6.5 mm and
7.5 mm.
The result for 3 variations of the investigation of the
influence of the maximum valve lift for a round crankshaft
concluded that under 7500 rpm wearing a standard model with a
maximum valve lift of 5.5 mm and above 7500 rpm for a round
wear variations of 3 with maximum valve lift 7.5 to the average
increase in engine performance -rata for Torque 9.46%, Power
9.68%, Brake Mean Effective Pressure (BMEP) 9.48%, Specific
Fuel Consumption (SFC) 1.9% and Efficiency Thermal 5, 24%.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.84 Sus a |
| Uncontrolled Keywords: | motor bakar, camshaft, crankshaft, variable valve timing, LES |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control. |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Users 13 not found. |
| Date Deposited: | 03 Jul 2017 07:59 |
| Last Modified: | 27 Dec 2018 07:51 |
| URI: | http://repository.its.ac.id/id/eprint/41852 |
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