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OPTIMASI PARAMETER PROSES VACUUM ASSISTED RESIN INFUSSION TERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT POLYESTER FIBER GLASS
Get PDFVacuum assisted resin infusion is a method which was used to manufacture composite review. The method of vacuum assisted resin infusion (VARI) method using inversely proportional to non-vacuum methods. Requires singer method air-room safe hearts printing. VARI process can be reducing the effects of fouling that much happens on as non vacuum processes which raises less than optimal properties of composite materials. Problems That study is to determine review process parameter optimization of vacuum assisted resin infusion against physical and mechanical properties of composite polyester fiber glass. Knowing the influence of vacuum pressure treatment and hardening of composite processing time in the manufacturing process of composite with VARI method in the physical and mechanical testing of surface roughness, tensile and impact. Variations were used that vacuum pressure of 0.2; 0.5; 1.0 bar and a hardening of composite 2 hours; 4 hours; 6 hours. From the research VARI composite manufacturing method, surface roughness values obtained, the tensile strength and the best impact occurs at various pressure of 0.2 bar and a time of 2 hours hardening composite has a value of 0.498 μm surface roughness, the value of 27.344 MPa tensile test and impact test values 47.859 J / mm2
PENGARUH KONSENTRASI INHIBITOR UBI UNGU TERHADAP LAJU KOROSI BAJA KARBON A53 DENGAN MEDIA AIR LAUT
Get PDFCorrosion is a form of damage that occurs in metals. The main factor is the cause of the corrosion environment. A53 steel is a type of low carbon steel and a steel material types that are widely used for pipe applications. The use of a corrosion inhibitor is one way of preventing corrosion. Anthocyanin substances contained in purple yam can be made in a natural inhibitor, because the substance is an antioxidant anthocyanin which is an oxidation inhibitor. Variables used were varied concentration of 0 ppm, 2000 ppm, 4000 ppm and 6000 ppm. This study aims to determine the rate of corrosion, purpel sweet potato extract efficiencies and changes in microstructure. The method used in this study is experimental, inhibitor efficiency analysis, ANOVA test and analysis micro photo. The results showed that the material is corroded by pitting corrosion and uniform shape. Values on concentration lowest corrosion rate of 0.0044 mmpy 6000 ppm and 6000 ppm at the highest efficiency of 72.70%.
Keywords: anthocyanin, steel A53, natural inhibitor, purple sweet potato
PENGARUH LAMA WAKTU PENGGETARAN ULTRASONIC BATH TERHADAP SIFAT MEKANIK DAN MORFOLOGI PATAHAN BIOKOMPOSIT PATI TAPIOKA/SERAT RAMI (BOEHMERIA NIVEA)
Get PDFThis study reported about mechanical properties and fracture surface of ramie fiber reinforced tapioca starch based biocomposites. The amount of fibers in matrix was kept constant at 10% from dry weight starch basis. Fabrication of biocomposites was solution casting. The effect of vibration duration from ultrasonic bath was 0, 15, 30, and 45 min. This treatment was applied to biocomposites while gelatinized. Tensile test was carried out to determine the mechanical properties of biocomposites. Fracture surface of biocomposites after tensile test was observed by using scanning electron microscopy (SEM). The result shows that, tensile strength increased when vibration time was added. The maximum tensile strength was obtained at 45 min vibration time with 2,84 MPa. This phenomenon was supported by SEM observation which indicate compact structure.
Keywords: Tapioca starch, ramie fiber, biocomposites, mechanical properties, SE
KARAKTERISTIK PEMBAKARAN PADA MESO SCALE COMBUSTOR DENGAN BAHAN BAKAR BUTAN DAN LIQUEFIED PETROLEUM GAS
Get PDFIncreasing energy consumption causes problems of natural resources, especially fossil energy. Micro Power Generator (MPG) is a technological breakthrough that can help save fossil energy. There are two main parts to MPG, namely micro or meso scale combustor and a converter module. For optimizing meso scale combustor, the best fuel is needed between LPG and Butane. This research was conducted to determine the combustion characteristics of meso combustor at the equivalent variation ratio of 1.15 and 1.20 at the reactant rate of 30 cm / s. The study was conducted on ignition of the combustor meso scale space with dimensions of 30 ml in length and 3.5 ml in diameter, with variations in the supply of air in fixed fuel supply. Combustion characteristics include temperature and color of fire. Butane flame temperature in the variety of equivalent ratio is higher than that of LPG fire. The fire color produced by Butana is dark blue and light blue LPG. This shows that the combustion of butane in meso combustor is better than LPG.
Keyword: Butane, LPG, combustor meso scale, fire color, flame temperatur
PENGARUH PENGARUH BENTUK DAN KONFIGURASI ALUR SEKAT TERHADAP UNJUK KERJA MENARA PENDINGIN (COOLING TOWER)
No full textThe cooling tower is mechanical equipment which used to decrease hot waste water. One of the factors that influence the performance is the filling components. This research is aimed to get the effect of buffle’s shape and configuration due to cooling tower performance. The cooling tower performance is described with range, heat transfer rate, and efficiency. The research is done by an experiment using laboratory scale cooling tower. The shape is varied as circle and triangle with 2-3 and 3-2 in a row configuration. The water flow rate is adjusted with 3 valve opening. Water temperature inlet is varied as 50, 60 and 70oC. The measurements are taken for inlet and outlet water and air temperature for 3 times measurements using K-type thermocouples. The result shows that buffle’s shape and configuration have an effect due to cooling tower performance.
Keywords: cooling tower, performance, buffle’s shape, configuratio
PENGARUH SUDUT TEKUK (CANT) WINGLET MENGGUNAKAN AIRFOIL NACA 2215 PADA AERODINAMIKA SAYAP PESAWAT
Get PDFFlight performance is determined by the lift coefficient (CL) and drag coefficient (CD). CL and CD values are influenced by the geometric shapes of aircraft wings. Air flow through the side of the aircraft causes wingtip vortices. Wingtip vortices add induced drag to the arms of the aircraft, creating reduced aircraft aerodynamic performance. Induced drag is a drag that results from the whirlwind of air flow due to differences in pressure on the surface of an aircraft wing. Previous studies obtained data that the use of winglets on sides with 45 o bending angle can increase the CL / CD ratio by 20.73% when compared to winglets. Winglet bend angle affects fluid flow and CL / CD ratio. The purpose of the study was to analyze the winglet bend angle of the aircraft wing aerodynamic performance. The winglet bending angle variations used were 0o, 30o, 60o, and 91.4o. Analysis of the bending angle on the winglet was done with VLAERO + software. The winglet bend angle is simulated with aircraft attack angles including - 15o, -10o, -5 o, 0o, 5o, 10o, 15o and 20o. The results showed that data for bending edge 91.4o produced CL / CD of 97.452, while wings without winglets only had CL / CD values of 80.701 at 0o attack angle. Winglets with 0o buckling angles reduce CD max at a 20o attack angle by 7.03%. The conclusion of the study informs that the addition of winglets can improve the aerodynamic performance of aircraft wings.
Keywords: winglet, VLAERO +, cant angle, lift coefficient, drag coefficient
PENGGUNAAN GENERATOR HHO PADA SEPEDA MOTOR DENGAN MENGGUNAKAN SISTEM BI-FUEL DENGAN VARIASI LARUTAN ELEKTROLIT
Get PDFTransport is one of the main community needs, but along with the increasing number of transport such as motorcycles and increasing also use of fuel oil.While fuel oil are currently derived from fossil where is not sustainable, alternative fuel can use water as fuel, by the process elektrolysis. Water is a compound composed of hydrogen and oxygen, both compound this is a flammable that can be used as alternative fuel or known as gas HHO . When used alternative fuel, gas HHO used along with fuel oil (bi-fuel) .This research discussed of the use of a generator HHO (tool gas producer HHO) on a motorcycle to a variation with an electrolyte namely fresh water, sea water and aquadesh in order to know some of the form a generator HHO that is the generator, the rate of the production of gas and efficiency of gas. This research obtained the best grades HHO power generator at 6.01 watts , the rate of the production of gas by 0.015 and efficiency as much as 1,265 when using aquades.
Keywords: HHO, HHO generator, electrolysi
THE EFFECT OF DEPOSITION TIME OF He-CH4TOSURFACE ROUGHNESS ON AISI 410 STEEL SURFACE
Get PDFPenelitian ini bertujuan untuk mengetahui pengaruh waktu pendeposisian He-CH4(helium-metana) pada permukaan baja AISI 410 terhadap angka kekasaran permukaan. Proses pendeposisian He-CH4 dapat dilakukan dengan plasma chemical vapor deposition (plasma CVD). Campuran gas He-CH4 dideposisikan di permukaan baja AISI 410 menggunakan temperatur 300 °C dan tekanan 2 mbar. Variasi waktu pendeposisian yaitu 1, 2, 3, 4, dan 5 jam. Perbandingan campuran gas He-CH4 adalah 76% He dan 24% CH4. Pengujian angka kekasaran permukaan menggunakan instrumen pengukur kekasaran permukaan Surfcom 120A. Berdasarkan hasil pengujian angka kekasaran permukaan didapatkan bahwa terjadi peningkatan angka kekasaran permukaan diawal pendeposisian. Angka kekasaran raw material sebesar 0,04 μm meningkat menjadi 0,1 μm setelah 2 jam pendeposisian. Penambahan waktu pendeposisian setelah melewati 4 jam menurunkan angka kekasaran menjadi 0,05 μm. Penambahan waktu pendeposisian menyebabkan permukaan lapisan menjadi halus dan rata
ANALISIS PARAMETER PEMOTONGAN DAN DEBIT PENDINGIN CNC MILLING TERHADAP KEKASARAN PERMUKAAN MENGGUNAKAN BOX BEHNKEN DESIGN
Get PDFIn the CNC milling machining process, the surface roughness of the workpiece is one of the most important things. By using the box method, the design method is to find parameters that affect the surface roughness of the workpiece. This study aims to determine the effect of feeding speed, feed depth and cooling discharge on the level of surface roughness. And find out which parameters produce the lowest surface roughness value in the CNC milling machining process. From the results of statistical analysis with a significant level in the amount of α = 5% (0.05) obtained feed speed parameters with a value of P> F = 1.79% and depth of infeed with a value P> F = 0.03% proved to have a significant effect on surface roughness, on the parameters cooling discharge proved not to have a substantial impact in surface roughness with a value of P> F = 5.82%. While the optimum combination for the lowest level of surface roughness can be obtained by a combination of 0.18 mm feed depth parameters, 180 mm / minute feeding speed and 10 ml / second cooling discharge with the lowest surface roughness value of 1.027 µm.
Keywords: surface roughness, Behnken design box, CNC millin
