Lontar Jurnal Teknik Mesin Undana (LJTMU)

5

Authors: Mohamad Fajri, Muhamad Jafri, Erich U. K. Maliwemu

Hydraulic ram is a solution for areas that do not have power in the region, because it does not require electricity or fuel to lift water from a lower to a higher place. This study was conducted to determine the efficiency of Hydraulic ram to change the waste valve diameter and the distance between the waste valves. The method used is an experimental method by the dimensions of the pump is 2 inches, has a 2-inch diameter inlet connection and outlet pipe diameter of 1 inch. From the research results that change factor waste valve diameter and the distance between the valve and the valve conductor waste effect on the efficiency of the pump. The highest efficiency of experimental results on Hydraulic ram on the waste valve diameter 0.041 m and 0.130 m spacing between the valves with the efficiency of 79.7535% on efficiency D'Aubuission.

6

Authors: Elfridus Bruno Lake, Muhamad Jafri, Nurhayati

This study aimed to determine the effect of wind speed and Blade angle Performance against Vertical Axis Wind Turbine Blade Savonius type. This study is a model made of type Savonius wind turbine blade in a laboratory scale. Dimensions tusrbin Savonius is a diameter of 0.1 meters and height of 0.1 meter, with a vertical rotor position (to facilitate the testing process), so it is assumed the direction of the air flow does not change and lead to the rotor which can be set when testing. The research method is an experiment, by variation of Blade angle -50, 00, 50 and 100. Variations in wind speed of 3.40 m/s, 4.35 m/s and 5.33 m/s. The testing procedure: Each model Savonius turbine rotor blade totaling 12 pieces assembled on Blade holder with angle -50, 00, 50 and 100. Each circuit is then mounted on the stand turbine located at one end of the tunnel and at the other end of the tunnel placed fan, turbine shaft is connected to a pulley as a hanging load. The fan is turned on. After a stable rotation, the wind speed is measured using the anemometer. The results of the research through variations of wind speed and angle of the blade on the performance of vertical axis wind turbine Savonius type, the variation of wind speed of 3.4 m/s, 4.35 m/s and 5.33 m/s showed best performance in blade angle of -50. Performance on the turbine blade angle variation of 00, 50, and 100 to the blade angle -50 occur an average increase of 70.47% power coefficient. The highest maximum output power is 0.282391 Watts (power coefficient of 0.310827), with 274.8864 rotor rpm, and torque variation occurs in 0.00981 Nm -50 blade angle and wind speed 5.33 m / s. Lowest maximum output power is 0.013548 Watts (power coefficient of 0.057451), with 0.000981 Nm torque on the rotor rotation occurs at 131.883 rpm and 50 and the blade angle variation of wind speed of 3.4 m/s by a margin of 84.4% of the highest maximum output power is obtained at an angle of -50 blade

8

Authors: Fredrikus M. Bere, Verdy A. Koehuan, Jahirwan Ut. Jasron

The contra rotating wind turbine is a horizontal axis turbine which has two shaft rotating in opposite directions on the same axis, and it can work at low wind speeds. In general, the performance of the wind turbine are affected by several factors, which is the aerodynamics shape of turbine, the numbers of blade and the selection angle of blade. In this study, conducted by determining the variation of angle on the blade and the blade angle used in the study is 0o, 5o, and 10o, on the two rotors with diameter of front rotor is 0.50 meters and the rear rotor is 0.30 meters, with the position of the rotor blade is coincident with each other. The purpose of this study, is to determine the effect of blade angle variation on the turbine rotation (rpm), torque (T), the power coefficient (Cp), torque coefficient (Cq) and the efficient of the turbine at any wind speeds variations. On the graph relation of blade angle on the shaft rotation, turbine rotation riding known to along with the addition of angle of the blade. The speed of wind is very affect on the output or mechanical power and power coefficient. On the blade angle 0o with wind speed at 4.03 m/s, the power can be generate is 3.013 Watt, and for blade angle 10o with wind speeds 6.08 m/s, the power can be generate is 8.217 Watt. The lowest rotation of rotor without loading is 702 rpm at the wind speeds on 4.03 m/s with angle of blade 0o, the highest rotation of rotor is 1484 rpm on the wind speeds 6.08 m/s with angle of blade 10o. From the graph of analysis data can be seen , with change of angle blade on wind turbine horizontal shaft contra rotating models, power coefficient (Cp) generated of turbine activity increases with increased of angle, with Cp maks 0.718 for angle 10o, maximum efficiency an generated reach out 71.8%.

9

Authors: Jorhans J. S. Nesimnasi, Kristomus Boimau, Yeremias M. Pell

Purpose of this research is to know the influence of alkali treatment on tensile properties of agave cantula fiber reinforced composite with polyester matrix. Fiber of agave cantula soaked in alkali solution (2% and 5% NaOH) during 2, 4 and 6 hour. After that, the fiber cleaned use water and dried naturally. Matrix which is used in this research is polyester unsaturated resin 157 BQTN with MEKPO hardener. Composite made with method press molding at Vf = 25%. The tensile testing is made related at standard of (American standard of testing materials) ASTM D-638. Tensile testing is done with universal testing machine and the elongations of measured by using meter shove. Result of this research indicate that highest tensile stress obtained on 5% alkali treatment during 2 hour with value is 36,866 Mpa while the lowest tensile stress obtained on 2% alkali treatment during 2 hour with value is 22.707 Mpa. Highest tensile strain obtained on 5% alkali treatment during 6 hour with value 2, 449% while lowest tensile strain obtained on 2% alkali treatment during 4 hour with value 1.780%. Highest Elasticity modulus obtained on 2% alkali treatment during 4 hour with value 18.078 MPa, while the lowest elasticity modulus obtained on the 2% alkali treatment during 2 hour with value 11,203 MPa.

11

Authors: Hendrikus Wona, Kristomus Boimau, Erich U. K. Maliwemu

The use of natural fibers as reinforcement material for natural fiber composite materials easily available, cheap, many types and variations. One of the natural fibers that can be used as reinforcement fiber composite is cantula agave plant leaves. In order to create a natural fiber composite material which has good mechanical properties, it should be known factors that affect the manufacture of the composite material. Factors that can affect the mechanical properties of the fiber composite material is fiber orientation, fiber composition, fiber volume fraction and volume fraction of the matrix. Fiber volume fraction is very large influence on the strength of the composite. This study aimed to determine the effect of fiber volume fraction on the bending strength and impact polymer composite reinforce cantula agave fiber with fiber volume fraction of 20%, 30% and 40%. The results showed that the bending and impact strength increases with increasing fiber volume fraction. Greatest bending obtained in the composite with 40% fiber volume fraction of 93.790 MPa and the lowest in the composite fiber volume fraction of 20% of 59.160 MPa, whereas for impact testing biggest impact on the composite with 40% fiber volume fraction of 0.159 Joules/mm2 and low impact strength obtained in composite fiber volume fraction of 20% amounting to 0.113 Joules/mm2