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<![CDATA[KAJIAN PENGARUH KONTROL ALIRAN TERHADAP KOEFISIEN HAMBAT MODEL KENDARAAN ]]>
<![CDATA[Boli, Rahmad Hidayat]]>;
<![CDATA[Rauf, Wawan]]>;
<![CDATA[Rifal, Moh]]>;
<![CDATA[Pido, Rifaldo]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 11 No. 1 (2023): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v11i1.355
<![CDATA[The characteristics of the airflow that is formed around the vehicle body affects the value of the resistance acting on the vehicle. When it reaches the rear edge of the vehicle, the flow undergoes a process of separation. So modification of the vehicle body design that is able to reduce the separation is urgently needed. Flow engineering around the vehicle body can be obtained by modifying the shape which is considered more aerodynamic. Meanwhile, flow engineering can also be obtained through the application of an active control system in areas that are considered to have the potential to initiate flow eddies on the rear side of the vehicle and have a major influence on the formation of flow separation. This research aims to examine the impact of the application of flow control blowing technique on the resistance of the modeled vehicle. The geometric angle of the front wall is determined to be 35°. The research uses a numerical computational approach with a standard k-epsilon as a turbulence model. The upstream velocity applied is 13.9 m/s, while the blowing velocity is set at 0.5 m/s. The research results prove that the application of blowing flow control has succeeded in minimizing the formation of wake structures and has the effect of delaying separation and has succeeded in reducing the aerodynamic drag coefficient to 9.3187%.]]>
<![CDATA[EFEK PENERAPAN KONTROL AKTIF BLOWING TERHADAP TARIKAN AERODINAMIKA MODEL KENDARAAN ]]>
<![CDATA[Rauf, Wawan]]>;
<![CDATA[Rifal, Moh]]>;
<![CDATA[Pido, Rifaldo]]>;
<![CDATA[Boli, Rahmad Hidayat]]>;
<![CDATA[Haris, Zulfikar Abd]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 11 No. 1 (2023): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v11i1.358
<![CDATA[Vehicle stability when driving is an issue that needs attention because it relates to comfort in driving and the effectiveness of fuel consumption. This is caused by the large aerodynamic drag force of the vehicle due to the structure of the air flow which flows regularly and experiences separation when it reaches the rear end point of the vehicle. This separation of the flows causes significant negative pressure on the rear window due to the return flow which does not follow the shape of the vehicle body. The purpose of this study was to analyze the effect of implementing active control of blowing type flow on vehicle models on aerodynamic drag. This study applies a numerical computational method with a modified Ahmed body model as the main object of research. The active blowing control is placed at the rear end of the model which is considered the initial separation area. Blowing speed was varied 0.2 m/s, 0.8 m/s, 1.5 m/s, and 2.0 m/s and was tested at an upstream speed of 16.7 m/s. Research results indicate that the application of active blowing control has succeeded in providing a delay in separation effect, reducing turbulence and reducing aerodynamic drag by 8-9%.]]>
<![CDATA[KAJIAN EKSPERIMENTAL PENGARUH CAMPURAN ETANOL DAN PERTAMAX TERHADAP KONSUMSI BAHAN BAKAR MOTOR INJEKSI 125CC ]]>
<![CDATA[Rauf, Wawan]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 11 No. 2 (2023): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v11i2.412
<![CDATA[Abstract: Experimental Study of the Effect of a Mixture of Ethanol and Pertamax on Fuel Consumption of a 125cc Injection Motorcycle. Currently the need for petroleum is quite high. This is because transportation and industry still rely on petroleum as the main fuel. Ethanol has similar properties to Pertamax fuel which can be applied to every vehicle, especially two-wheeled vehicles. The aim of this research is to find out how the addition of ethanol to Pertamax fuel affects the amount of fuel consumed by injection motorbikes. The mixture percentages that will be tested are E10+P90, E20+P80, and E30+P70 respectively, and then the consumption results are compared with tests using pure Pertamax (E0+P100). The test results show that the use of Ethanol-Pertamax mixed fuel can be reduced when the percentage of the ethanol mixture is below 50%. Where the lowest fuel consumption is the E30+P70 mixture at 16.4% compared to pure Pertamax consumption.]]>
<![CDATA[ANALISIS KEKUATAN TARIK MATERIAL KOMPOSIT BERBAHAN SERAT BAMBU MAYAM ]]>
<![CDATA[Talango, Novriyanti]]>;
<![CDATA[rauf, wawan]]>
<![CDATA[ JURNAL SIMETRIK Vol 13 No 2 (2023) ]]>
Publisher : <![CDATA[Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon ]]>
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DOI: 10.31959/js.v13i2.1897
<![CDATA[Penelitian ini bertujuan mengetahuai kekuatan tarik dari bahan komposit serat bambu mayan dengan matriks polyester resin dan epoxy resin, serta katalis sebagai matriks atau pengikat dari serat bambu mayan (gigatochloa robusta)  dengan perbandingan resin 90% dan 10% serat bambu mayan serta 80% resin dan 20% serat bambu mayan. Hasil Pengujian menunjukan kuat tarik komposit serat bambu mayan dengan perbandingan resin epoxy dan serat bambu 90:10 memiliki nilai rata-rata 44.79 N/mm2, sedangkan pada perbandingan 80:20 memiliki nilai rata-rata sebesar 50.01 N/mm2.. Hasil uji tarik dengan perbandingan 90:10 resin polyester dan serat bambu memiliki nilai rata-rata 51.3 N/mm2 dan pada perbandingan 80:20 memiliki nilai rata-rata sebesar 82.29 N/mm2. Perbedaan hasil tegangan dan regangan pada nilai rata-rata kuat tarik karena dua resin yang digunakan memiliki densitas dan sifat yang berbeda. pencampuran resin epoxy dan hardener perbandingan 3:1 dengan grade viksikositas encer menghasilkan sifat yang ulet. Pencampuran resin polyester 450 gr dan jumlah katalis 3 tetes dengan grade viksikositas kental menghasilkan sifat yang getas.]]>
<![CDATA[ANALISIS SIFAT MEKANIS SERAT BAMBU SEBAGAI ALTERNATIF BAHAN KOMPOSIT MELALUI UJI BENDING ]]>
<![CDATA[Talango, Novriyanti]]>;
<![CDATA[Rauf, Wawan]]>
<![CDATA[ JURNAL SIMETRIK Vol 14 No 1 (2024) ]]>
Publisher : <![CDATA[Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon ]]>
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DOI: 10.31959/js.v14i1.2305
<![CDATA[Berkembangnya teknologi di jaman sekarang serat bambu memiliki sifat mekanis yang lebih baik dibandingkan dengan serat alam lainnya, dan bambu juga merupakan jenis tanamana yang cukup dibilang penting untuk dikembangkan, serat bambu juga dapat digunakan sebagai penguat komposit. Penelitian ini bertujuan untuk menganalisis kekuatan bahan komposit serat bambu mayam melalui uji bending. Material yang digunakan pada penelitian ini adalah serat bambu mayam, resin polyester, resin epoxy dan katalis. Pengujian dilakukan pada laboratorium material Teknik Mesin. Perbandingannya komposisi antara lain resin 90% dan serat bambu mayan 10%, serta resin 80% dan serat bambu mayam 20%. Hasil pengujian bending menunjukanntuk komposisi Resin poliester 80% dan serat bambu 20% menghasilkan nilai rata-rata 132.12 N/mm2, sedangan untuk komposisi resin poliester 90% dan serat bambu menghasilkan nilai rata-rata 107.61 N/mm2. Selain itu untuk komposisi Resin epoksi 80% dan serat 20% menghasilkan nilai rata-rata 30.71 N/mm2 dan untuk komposisi resin epoksi 90% dan serat bambu 10% menghasilkan nilai rata-rata 46.01 N/mm2. Sementara itu untuk perhitungan modulus elastisitas bending untuk komposisi resin poliester 80% dan serat 20% menghasilkan nilai 0.065 mm dan komposisi resin poliester 90% dan serat 10% menghasilkan nilai 0.068 mm. Sedangkan untuk komposisi resin epoksi 80% dan serat 20% menghasilkan nilai 5.486 mm dan komposisi 90% resin epoksi dan 10% serat menghasilkan nilai modulus elastisitas 19.21 mm.]]>
<![CDATA[ANALISIS KONSUMSI BAHAN BAKAR MOTOR MENGGUNAKAN CAMPURAN BIO FUEL DAN PERTALITE ]]>
<![CDATA[rauf, wawan]]>;
<![CDATA[Sahional Ishak]]>;
<![CDATA[Talango, Novriyanti]]>
<![CDATA[ JURNAL SIMETRIK Vol 14 No 2 (2024) ]]>
Publisher : <![CDATA[Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon ]]>
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DOI: 10.31959/js.v14i2.2698
<![CDATA[Â Saat ini jumlah cadangan minyak bumi yang ada semakin menipis disebabkan bahan bakar fosil merupakan sumber energi yang tidak dapat diperbaharui. Ini pula yang menyebabkan adanya fluktuasi suplai dan harga bahan bakar minyak. Penelitian ini bertujuan menganalisis konsumsi bahan bakar campuran etanol dan pertalite yang dibandingkan dengan konsumsi pertalite murni. Motor uji yang digunakan dilengkapi dengan CDI yang divariasikan jenisnya. Riset dilakukan secara eksperimental dengan memanfaatkan chasis dinamometer sehingga memungkinkan pengujian tanpa berpindah tempat. Presentase campuran pertalite dan etanol divariasikan masing-masing E15 dan E30 dibandingkan konsumsinya dengan konsumsi pertalite murni. Campuran bensin dan ethanol dicampur sebelum pelaksanaan pengujian untuk menghindari terjadinya pemisahan antara bensin dan ethanol saat disimpan lama. Hasil peneitian menunjukan bahwa penggunaan campuran bahan bakar pertalite dan etanol 15% memiliki konsumsi lebih rendah dibandingakan dengan konsumsi bahan bakar pertalite murni serta campuran pertalite dan etanol 30%. Presentase penurunan tersebut dituliskan 2.86944% untuk penggunaan CDI standar, 2.73224% untuk CDI programable switch 1 dan 2.67738% untuk CDI programable switch 2.]]>
<![CDATA[ANALISIS KONSUMSI ENERGI LISTRIK PADA PEMBANGUNAN NUWSP BIYONGA KABUPATEN GORONTALO ]]>
<![CDATA[Boli, Rahmad Hidayat]]>;
<![CDATA[Pido, Rifaldo]]>;
<![CDATA[Arbie, Mohamad Rifal]]>;
<![CDATA[Rauf, Wawan]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/jrm.v15i1.1496
<![CDATA[The need for electrical energy today is starting to increase along with the increase in population and rapid development, but inversely proportional to the progress or innovations in increasing renewable energy. Given that this renewable energy can be developed continuously and operational costs are relatively cheap, the electricity that relies on coal (fossil) over time will run out and cannot be renewed, the discussion concerns the supply of PLN supplies. So that in this study the focus is on the utilization of electrical energy for the NUWSP development area of Gorontalo Regency Biyonga Village and calculating the total consumption needs of the electrical energy used. After research and data analysis, the results obtained are 189 kVA or 189,000 vA, the total peak demand with load is 3 units of centrifugal pumps, 10 points of room lighting, and 12 points of lighting around the building, the results of the analysis obtained became a reference and suggested to install electrical energy with a capacity of 197 kVA or 197,000 vA with the consideration that when development occurs, the demand for electrical energy is still sufficient from what is installed.]]>
<![CDATA[KAJIAN KOMPUTASI DAN EKSPERIMENTAL PENGARUH KONTROL AKTIF TERHADAP HAMBATAN AERODINAMIKA MODEL KENDARAAN ]]>
<![CDATA[Rauf, Wawan]]>;
<![CDATA[Rifal, Mohamad]]>;
<![CDATA[Boli, Rahmad Hidayat]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 10 No. 1 (2022): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v10i1.268
<![CDATA[Abstrak: Kajian Komputasi dan Eksperimental Pengaruh Kontrol Aktif terhadap HambatanAerodinamika Model Kendaraan. Dinamika aliran udara sangat dipengaruhi oleh pembentukan separasi di sekitar bodi kendaraan. Separasi aliran menjadi pemicu perbedaan tekanan yang signifikan antara sisi depan dan belakang sehingga muncul efek tarikan ke arah belakang sebagai kontributor utama besarnya hambatan aerodinamika yang diterima kendaraan. Penelitian ini fokus pada kajian hambatan aerodinamika dengan memperhatikan karakteristik pola aliran yang terbentuk dan distribusi tekanan pada dinding belakang model kendaraan melalui metode simulasi komputasi dan eksperimental laboratorium. Kontrol aktif tiupan ditempatkan pada sisi atas dinding belakang Ahmed model dan diatur pada kecepatan 1.5 m/s. Hasilnya menunjukkan bahwa penggunaan kontrol aktif tiupan pada sisi belakang mampu menunda separasi, meningkatkan koefisien tekanan, dan mengurangi hambatan aerodinamika model kendaraan. Abstract: Computational and Experimental Studies of the Effect of Active Control on Aerodynamic Drag of Vehicle Models. The dynamics of air flow is strongly influenced by the formation of separations around the vehicle body. The flow separation triggers a significant pressure difference between the front and rear sides so that a rearward pull effect appears as the main contributor to the amount of aerodynamic drag received by the vehicle. This research focuses on the study of aerodynamic resistance by paying attention to the characteristics of the flow pattern formed and the pressure distribution on the rear wall of the vehicle model through computational simulation methods and laboratory experiments. The blowing active control is located on the upper side of the back wall of the Ahmed model and is set at a speed of 1.5 m/s. The results show that the use of blowing active control on the rear side is able to delay separation, increase the pressure coefficient, and reduce the aerodynamic drag of the vehicle model.]]>
<![CDATA[ANALISIS PENGARUH VARIASI SUDUT KEMIRINGAN TERHADAP OPTIMASI DAYA PANEL SURYA ]]>
<![CDATA[Pido, Rifaldo]]>;
<![CDATA[Boli, Rahmat Hidayat]]>;
<![CDATA[Rifal, Moh]]>;
<![CDATA[Rauf, Wawan]]>;
<![CDATA[Dera, Nurmala Shanti]]>;
<![CDATA[Day, Randy Rianto]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 10 No. 2 (2022): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v10i2.287
<![CDATA[Abstrak: Analisis Pengaruh Variasi Sudut Kemiringan Terhadap Optimasi Daya Panel Surya. Di Gorontalo suhu atau temperature udara yang tinggi yang dapat mempengaruhi kinerja pada panel surya. Suhu udara di Gorontalo pada siang hari dapat menembus angka diatas 34°C dibandingkan suhu optimal operasi dari panel surya sendiri adalah 25°C. Rumusan masalah dalam penelitian ini adalah apakah ada pengaruh perubahan sudut sel surya terhadap intensitas cahaya. Sedangkan Tujuan dari penelitian ini adalah upaya mengoptimalkan output tegangan, arus dan daya pada sel surya agar lebih maksimal. Salah satu metode pengoptimalan sel surya adalah dengan memvariasikan sudut kemiringan panel surya 9˚, 12˚ dan 15˚. Metode pada penelitian ini dengan melakukan pengukuran besaran intensitas cahaya matahari, arus dan tegangan dengan menggunakan panel surya 50 WP, pengukuran tersebut dilakukan selama 9 hari. Hasil analisis pada penelitian ini adalah persentase peningkatan daya sebesar 43.85 Watt pada sudut kemiringan 15˚, sedangkan daya output mengalami penurunan pada sudut kemiringan 12˚ dan 9 ˚ yaitu 41.70 Watt dan 39.43 Watt. Secara keseluruhan perubahan arah sudut sel surya berpengaruh terhadap intensitas cahaya matahari yang berakibat pada kuat lemahnya tegangan yang diterima panel sel surya. Semakin besar intensitas cahaya yang diterima, maka semakin besar pula tegangan yang dihasilkan panel surya. Kata kunci: sel surya; intensitas cahaya; sudut azimuth; daya Abstrack: Analysis of the Effect of Tilt Angle Variations on Solar Panel Power Optimization. In Gorontalo the temperature or air temperature is high which can affect the performance of the solar panels. The air temperature in Gorontalo during the day can reach above 34°C compared to the optimal operating temperature of the solar panels themselves which is 25°C. The formulation of the problem in this study is whether there is an effect of changing the angle of the solar cell on the light intensity. While the purpose of this research is an effort to optimize the output voltage, current and power in solar cells to be more leverage. One method of optimizing solar cells is by varying the angle of inclination of the solar panels to 9˚, 12˚ and 15˚. The method in this study is to measure the intensity of sunlight, current and voltage using a 50 WP solar panel, the measurements were carried out for 9 days. The results of the analysis in this study are the percentage increase in power of 43.85 Watt at an angle of 15˚, while the output power decreases at an angle of 12˚ and 9˚, namely 41.70 Watt and 39.43 Watt. Overall changes in the direction of the solar cell angle affect the intensity of sunlight which results in the strength and weakness of the voltage received by the solar cell panel. The greater the intensity of light received, the greater the voltage generated by the solar panel. Kata kunci: solar cell; intensity of light; azimuth angle; power]]>
<![CDATA[ANALISIS KEKERASAN SAMBUNGAN LAS MIG BAJA KARBON RENDAH DENGAN BERBAGAI VARIASI KAMPUH ]]>
<![CDATA[Ishak, Sahianol]]>;
<![CDATA[Rauf, Wawan]]>
<![CDATA[ RADIAL : Jurnal Peradaban Sains, Rekayasa dan Teknologi Vol. 11 No. 1 (2023): RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi ]]>
Publisher : <![CDATA[Universitas Bina Taruna Gorontalo ]]>
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DOI: 10.37971/radial.v11i1.341
<![CDATA[Along with technological developments, the use of metals such as steel cannot be separated from the welding process. Where welded joints have advantages in the form of lightweight construction, able to withstand high loads, and are more economical. One of the factors that must be considered in producing a good welded joint is the weld camp. Welding camp are used to accommodate filler material on the metal, so that the determination of the type of camp is based on the needs of the construction being built. The purpose of this study was to analyze the hardness of low carbon steel MIG welded joints with various variations of camp and welding temperature. The test material used was ST 37 low carbon steel with a thickness of 6 mm and a width of 100 mm. Tests were carried out to compare the weld joint hardness values with the application of V, I, and K seams on each welding electric current of 130 A, 150 A, and 170 A. The test results showed that in all types of seams, the higher the welding electric current. Applied, the greater the hardness value of the welded joint obtained. The highest hardness value was obtained at a welding current of 170 A with a V camp of 89.8 N/mm2.]]>
