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All Journal INOVTEK POLBENG International Journal of Marine Engineering Innovation and Research
Mardi Santoso
Politeknik Perkapalan Negeri Surabaya
Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Peningkatan Performa 4 Stroke SI Engine menggunakan Voltage Stabilizer untuk Kontrol AFR George Endri Kusuma; Sryang Tera Sarena; Mardi Santoso; Emie Santoso; Ekky Nur Budianto; Himawan Candra Buana
INOVTEK POLBENG Vol 11, No 1 (2021): INOVTEK VOL.11 NO1, 2021
Publisher : POLITEKNIK NEGERI BENGKALIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/ip.v11i1.1715

Abstract

The manufacturer's rules apply Euro 3 and Euro 4 as an effort to reduce emissions in the air. The standard input voltage for the Engine Control Unit (ECU) is 12V to produce an ideal Air to Fuel Ratio (AFR) at a value of 14.7. However, in machine operation in the field, the voltage supplied by the battery cannot be constant at that number and causes the AFR to change too, especially in open-loop ECU systems. The input voltage that is too low can affect the AFR to be too high. The condition might cause the engine temperature to be too high and decreases engine performance. As a solution to this problem, this research develops a voltage stabilization mechanism (VC) to facilitate the setting of air and fuel for the engine to be constant at the desired value. To get the best AFR value, engine performance is tested with dyno tests including power, torque, fuel oil consumption, and AFR. The test results show that the best engine performance value reaches 16.7 HP at 10000 RPM and 13.35 Nm of torque at 8000 RPM, and a voltage of 12.5 V and AFR 14.11. The AFR value is used as input to the VC system, and the equipment can adjust the voltage automatically to stabilize the AFR at a predetermined value.
An Experimental Study of Stagger Angle Effect Placed in front of Returning Side toward the Savonius Wind Performance Using Overlap Myring Blade for n = 1 Priyo Agus Setiawan; Projek P. S. Lukitadi; Emie Santoso; Nopem Ariwiyono; Aminatus Sa’diyah; Daisy D. K. R. Antariksih; Galih Anindita; Budi Prasojo; George E. Kusuma; Rini Indarti; Mardi Santoso; Bambang Antoko; Endang P. Purwanti; Mohammad M. Munir
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6402

Abstract

The previous Savonius wind turbine studies have proved that overlap modifications to conventional blades can improve turbine performance. With these conventional blades, the performance is less optimum because the drag force generated by turbine's rotation is still high. Based on this condition, this experiment is conducted by modifying Savonius wind turbine with overlap blades using Myring equation n = 1. Its blade profile is made half-elliptical to reduce drag force. Diameter and height of the turbine are 400 mm with 0.3 overlap ratio. The ratio of cylinder diameter (ds/D) is 0.4, and the ratio of cylinder center distance (S/d) is 1.7. Experiments are conducted by varying stagger angles of circular cylinder in front of returning blade are 45°, 50°, 55°, and 60° with velocity 5 m/s. The final results show that the best performance improvement of the turbine occurs at 60° stagger angle. The increase in torque coefficient is 4.95% and power coefficient is 20.16% to overlap Savonius wind turbine with myring n = 1 with no circular cylinder.
Co-Authors Aminatus Sa’diyah Bambang Antoko Budi Prasojo Budiyanto, Ekky Nur Daisy D. K. R. Antariksih Endang P. Purwanti Galih Anindita George E. Kusuma Himawan Candra Buana Kusuma, George Endri Mohammad M. Munir Nopem Ariwiyono, Bachtiar Priyo Agus Setiawan Projek P. S. Lukitadi Rini Indarti Santoso, Emie Sryang Tera Sarena