Analisa aliran udara masuk dan camshaft stress pada gas engine jenis variable valve lift

Kriswana, Deni (2017) Analisa aliran udara masuk dan camshaft stress pada gas engine jenis variable valve lift. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan teknologi variable valve lift pada diesel gas engine telah mampu menembah power tanpa harus mengubah dimensi mesin. Namun analisa mendalam tentang bagaimana aliran yang terjadi pada saat udara masuk dan stress yang terjadi pada camshaft gas engine perlu dikaji lebih dalam. Simulasi analisa aliran udara masuk dan camshaft stress pada gas engine tipe variable valve lift diharapkan dapat memberikan gambaran pengaruh dari penggunaan valve lift pada gas engine. Dalam percobaan simulasi ini menggunakan pendekatan CFD (computataional fluid dynamic) dan structural stress dengan variable bukaan valve pada kondisi default sebesar 11.1 mm, bukaan yang ditingkatkan 1.5 x sebesar 16.65 mm, 2x sebesar 22.205 mm, dan 2.5x sebesar 27.7 mm. Dimana dari simulasi tersebut menunjukkan hasil bahwa pada kondisi bukaan valve dari 11.1 mm sampai 22.205 mm mengalami kenaikan kecepatan udara rata-rata dan massa aliran udara, sementara pada bukaan valve 27.7 mm mengalami penurunan kecepatan rata-rata. Nilai stress yang dihasilkan dari bukaan valve 11.1 mm sampai 27.7 mm terus mengalami peningkatan karena gaya yang ditimbulkan pada spring semakin dalam bukaan valve maka gaya pada spring semakin meningkat. ================================================================= The use of variable valve lift technology on diesel gas engine has been able to increase power without having to change the dimensions of the engine. However, in-depth analysis of how the flows that occurs when air enters and stress that occur in camshaft of gas engine needs to be studied more deeply. Simulation Analysis incoming airflow and stress on the gas engine camshaft variable valve lift types expected to describe the effect of the use of valve lift on the gas engine. In this simulation experiments using CFD approach (computational fluid dynamic) and structural stress with variable valve opening on the condition of default by 11.1 mm, openings increased by 16.65 mm or 1.5 times, 2 times by 22.205 mm, and 2.5 times by 27.7 mm. Where the results of the simulation showed that the condition of the valve from 11.1 mm to 22.205 mm increased the average air velocity and massflowrate, while at the opening valve 27.7 mm decreased average speed. The resulting stress value of the valve 11.1 mm to 27.7 mm continues to increase due to the force created in the spring getting into the valve then increasing the force on the spring.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: variable valve lift, flow analysis, stress
Subjects: T Technology > TJ Mechanical engineering and machinery
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Deni Kriswana
Date Deposited: 28 Sep 2017 03:56
Last Modified: 06 Mar 2019 07:44
URI: http://repository.its.ac.id/id/eprint/44800

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