scholarly journals Analisa Penurunan Daya yang Dihasilkan Mesin Bantu Guna Meningkatkan Operasional Kapal di MT. Dewi Maeswara

2020 ◽  
Vol 2 (1) ◽  
pp. 166-173
Author(s):  
Mohamad Ridwan ◽  
Diah Zakiah ◽  
Ardiansyah
Keyword(s):  
Fuel Injection ◽  
Diesel Generator ◽  
Injection Pump ◽  
Fuel Injection Pump

Mesin bantu memiliki peran yang sangat besar dalam pengoperasian kapal. Masalah yang sering muncul pada mesin bantu adalah tidak tepatnya waktu pengabutan bahan bakar oleh fuel injection pump dan goresan pada jarum tekan injector (plunger). Tujuan dilakukan penelitian ini yaitu untuk mengetahui penyebab tidak tepatnya waktu pengabutan bahan bakar ke dalam  ruang bakar mesin bantu dan menemukan penyebab terjadinya goresan pada jarum tekan injector (plunger). Metode yang digunakan adalah deskriptif kualitatif. Dari hasil penelitian diperoleh kesimpulan bahwa terlambatnya waktu pengabutan bahan bakar pada diesel generator nomor 2 disebabkan karena rendahnya suhu gas buang pada silinder nomor 1 dan 2. Hasil pengambilan tekanan Pmax menunjukkan tekanan yang tidak mencapai titik maksimal pada silinder nomor 1 dan 2 atau Pmax nya terlalu rendah. Permasalahan pada fuel injektor (goresan pada jarum tekan atau plunger) disebabkan karena perbedaan temperatur gas buang yang sangat signifikan pada diesel generator nomor 2, termometer pada gas buang silinder nomor 4 dan 5 menunjukan angka diatas rata-rata sedangkan pada silinder lainnya yaitu nomor 1, 2, 3 dan 6 temperatur terlihat normal yaitu berkisar antara 3500C – 3700C

Comparison of intake and exhaust throttling for diesel particulate filter active regeneration of non-road diesel engine with mechanical fuel injection pump

2020 ◽  
pp. 146808742092603
Author(s):  
Wonmo Kang ◽  
Sukang Pyo ◽  
Hongsuk Kim
Keyword(s):  
Fuel Consumption ◽  
Diesel Particulate Filter ◽  
Fuel Injection ◽  
Particulate Filter ◽  
Diesel Particulate ◽  
Air Mass ◽  
Filter Regeneration ◽  
Exhaust Temperature ◽  
Injection Pump ◽  
Fuel Injection Pump

Diesel particulate filter regeneration using intake and exhaust throttling is technically simple and economically efficient compared to other methods. The purpose of this study is to investigate not only the reasons for the increase in exhaust temperature during intake or exhaust throttling but also their feasibility as a diesel particulate filter regeneration technology. In this study, a non-road diesel engine having a mechanical fuel injection pump was used for experiments. The changes in exhaust temperatures were measured during intake and exhaust throttling for the no-load maximum revolutions per minute engine condition. The experimental results exhibited that both intake and exhaust throttling reduced the intake air mass flow rate and increased piston pumping, which then increased fuel consumption. These effects were the primary reasons for increasing the temperature of exhaust gases. In particular, intake throttling was more effective than exhaust throttling in terms of reducing the intake air mass flow rate. However, exhaust throttling caused larger pumping losses, resulting in higher fuel consumption. Furthermore, in case of exhaust throttling, engine combustion was possible even at high equivalence ratios because of the larger amounts of residual gases in the combustion chamber. In summary, exhaust throttling is more effective for regenerating a diesel particulate filter at a high temperature than intake throttling. In addition, this study verified the feasibility of diesel particulate filter regeneration using exhaust throttling through analyses of diesel particulate filter regeneration efficiency, fuel consumption, and exhaust concentration when regenerating the diesel particulate filter by increasing the exhaust temperature through exhaust throttling.

Paper 6: Torsional Vibrations in Fuel Injection Pump Drive Systems with Special Reference to Automotive Engines

1966 ◽  
Vol 181 (8) ◽  
pp. 84-90
Author(s):  
L. F. Martyn ◽  
T. M. B. Silcock
Keyword(s):  
Diesel Engine ◽  
Natural Frequency ◽  
Fuel Injection ◽  
Torsional Vibrations ◽  
Pump System ◽  
Automotive Engines ◽  
Injection Pump ◽  
Infinite Mass ◽  
Fuel Injection Pump ◽  
Drive Systems

The torsional vibrations which occur on the fuel injection pump of an automotive diesel engine were investigated. Calculations and tests showed that as well as vibrations transmitted from the crankshaft, the fuel pump could vibrate at the natural frequency of the torsional system consisting of the pump and the drive coupling against an infinite mass. This was excited by harmonic torques produced by the pump. Calculations were made to show the effect of variables on the natural frequency of the pump system including the instance when a crankshaft natural frequency coincided with a pump natural frequency. Calculations were also made of the effect of the engine harmonic torques on the pump vibrations. The results were verified by experiments.

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