Analisa Dan Pemodelan System Variable Valve Timing Pada Engine Four Stroke 100 CC

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 %. ================================================================================================================== 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 > (S1) Undergraduate Theses
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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