CRISTIAN, PRASANDY (2023) SISTEM PERAWATAN ROCKER ARM UNTUK MENUNJANG KELANCARAN KINERJA MESIN DIESEL KAPAL RUKINA SUKSES ABADI MARINE TIGA. KARYA TULIS.
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Abstract
The diesel engine is a type of internal combustion, as the name implies, the internal combustion engine is a heat engine in which the chemical energy of combustion is released in the engine cylinder. Another class of steam engines, the energy generated during the combustion of fuel is passed first to the steam, and only through the steam work is done in a turbine or engine. One of the components of a diesel engine is the rocker arm. Evaluating the fatigue resistance of a diesel engine rocker arm, stress measurements were made using a strain gauge mounted near the neck which is one of the most critical areas of the rocker arm, while varying the engine speed. Fatigue experiments were carried out on miniature specimens taken from rocker arms. To evaluate the fatigue resistance of the rocker arm, the S–N data is compared with the stress analysis results obtained through the Finite Element Modeling (FEM) analysis of the rocker arm. The effective von-Mises stress in the rocker arm area is determined to be 22.4 MPa. The safety factor of this component is rotation per minute between 720 - 1800 Rpm, so within 1 (one) minute the frictional parts receive a load of up to 720 - 1800 friction times. each based on the fatigue resistance limit and the modified fatigue resistance limit, indicating that this safety factor is suitable for maximum ship operation, the method of maintenance of the rocker arm is carried out periodically for components and diesel engine systems in case of damage. Excessive wear that occurs at the rocker arm/pushrod and rocker arm/valve interfaces of diesel engines, only after 8000-16000 hours of engine operation according to manufacturer's instructions. Evaluating the wear mechanism, the worn surfaces were analyzed by scanning electron microscopy with energy dispersive spectroscopy. The results show non-uniform wear damage at the rocker arm/valve interface, valve misalignment with respect to the valve seat insert. rocker arms and pushrods, improper austenitization parameters and inappropriate inductor design left some free ferrite. The wear surface is characterized by removal of material by scuffing; Fatigue crack initiation was also observed at the rocker arm/valve interface, and erosive cutting occurred at the rocker arm/pushrod interface. The rocker arm is part of the engine component located on the valves to control the intake and exhaust of air and fuel flow to the cylinder head. The fluctuating load of each defect in the manufacturing process will make the rocker arm experience fatigue failure. Overcoming fatigue failure, most rocker arms are made through forging, which can improve strength and reduce manufacturing process defects. Keywords: rocker arm, diesel engine, valve mechanisme
| Item Type: | Article |
|---|---|
| Additional Information: | 205802021 |
| Subjects: | Teknika |
| Divisions: | Program Studi > D3-Teknika |
| Depositing User: | AMNI Perpustakaan Semarang |
| Date Deposited: | 06 Jun 2023 07:10 |
| Last Modified: | 06 Jun 2023 07:10 |
| URI: | http://repository.unimar-amni.ac.id/id/eprint/5305 |
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