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All Journal Jurnal Teknologi Journal of Applied Sciences and Advanced Technology
Kisman H Mahmud
Universitas Muhammadiyah Jakarta
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering

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ANALISA PERFORMA MESIN MOTOR 4 LANGKAH 110CC DENGAN MENGGUNAKAN CAMPURAN BIOETANOL-PERTAMAX Sri Anastasia Yudistirani; Kisman H Mahmud; Frisca Amalia Ummay; Anwar Ilmar Ramadhan
Jurnal Teknologi Vol 11, No 1 (2019): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.11.1.85-90

Abstract

Permasalahan tentang bahan bakar fosil yang mengemuka pada tahun-tahun ini adalah permasalahan tentang menipisnya jumlah bahan bakar fosil dan pemanasan global. Saat ini dirasa sangatlah penting untuk melanjutkan usaha observasi dan pengembangan teknologi berbahan bakar alternatif. Alkohol dengan kadar tinggi dapat digunakan secara langsung pada mesin, maupun dapat juga dicampurkan dengan kadar tertentu pada bensin sebagai bahan bakar. Pemanfaatan alkohol sebagai bahan bakar pengganti bensin, pertamax, pertalite atau sebagai campuran bensin diharapkan mampu mengurangi konsumsi pemakaian bahan bakar dari minyak bumi. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan campuran bensin dan ethanol serta jenis bahan bakar yang sesuai dan untuk mendapatkan unjuk kerja mesin motor bensin 4 langkah yang optimum. Metode penelitian yang dilakukan yaitu: pengujian torsi dan daya pada mesin 4 langkah 110cc dengan menggunakan campuran bioethanol-pertamax untuk variasi putaran mesin 5000-9000 rpm. Hasil penelitian menunjukkan bahwa bahan bakar dengan menggunakan bahan bakar pertamax maupun campuran variasi pertamax dan ethanol (0%,30%, 50%, 70%) terjadi perubahan karakteristik, yaitu peningkatan daya sampai dengan putaran 7000 rpm. Pada putaran yang tinggi, penambahan ethanol mampu memberikan torsi dibandingkan dengan pada saat menggunakan bahan bakar pertamax.
ANALISIS KEKERASAN PADA OUTER RING DAN INNER RING HASIL PROSES HEAT TREATMENT Sri Anastasia Yudistirani; Kisman H Mahmud; Ery Diniardi
Jurnal Teknologi Vol 10, No 1 (2018): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.10.1.83-88

Abstract

Bearing adalah elemen mesin yang menyerupai poros berbeban, sehigga putaran atau gerak bolak-baliknya dapat berlangsung dengan halus, aman dan panjang umur. Bearing harus kokoh dan ulet untuk memungkinkan poros serta elemen mesin lainnya bekerja dengan baik. Jika bearing tidak berfungsi dengan baik maka prestasi seluruh sistem akan menurun atau tidak dapat bekerja dengan semestinya. Untuk itu, bahan dari bantalan yang merupakan baja karbon tinggi harus bersifat ulet dan tangguh. Untuk mendapatkan sifat logam yang diinginkan dilakukan proses Heat Treatment (perlakuan panas), khususnya pada outer  dan inner ring. Pengujian kekerasan pada outer  dan inner ring dari bantalan dilakukan setelah proses Heat Treatment. Pengujian kekerasan dengan menggunakan Digital Rockwell Hardness Tester, nilai dari kekerasan tersebut dapat langsung dibaca pada skala alat tersebut. Proses Heat Treatment outer  dan inner ring dari bantalan XYZ dapat menghasilkan sifat-sifat mekanik yang diinginkan pabrik, yaitu angka kekerasan Rockwell 62-64 HRC. Jika hasil dari pengujian kekerasan nilainya sesuai dengan standar pabrik, maka outer  dan inner ring tersebut memenuhi syarat kualitas pabrik.
Analysis of the Tensile Strength of Composite Material from Fiber Bags Ery Diniardi; Nelfiyanti Nelfiyanti; Kisman H Mahmud; Hasan Basri; A I Ramadhan
Journal of Applied Sciences and Advanced Technology Vol 2, No 2 (2019): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (964.396 KB) | DOI: 10.24853/jasat.2.2.39-48

Abstract

The use of composite materials in Indonesia, as a nonmetal alternative material has begun to increase. Composite use has grown from water tanks from fiberglass materials, household appliances, children's toys, sports equipment, furniture/interior design to automotive components and aircraft. Many of the advantages of this composite material include hand, strong, anti-corrosion, finely tuned finish. Its mild nature has a direct impact on energy savings. The prospect of composite materials as a non-metal alternative material is rapidly growing and its use. Various types of reinforce used can be influenced by the prices available, so seek alternatives as a commonly used glass fiber substitute woven rowing. The substitute used is a sack of gourds of the same kind as woven rowing, from which the same type of fiber is tried to find its strength by undergoing a pull test. And as a result of the test the mateial can know its power.
Analysis of Steering Wheel Heavy Komatsu Dump Truck Unit (HD) 785-7 Hasan Basri; Ery Diniardi; Kisman H Mahmud; Syawaluddin Syawaluddin; Firmansyah Firmansyah
Journal of Applied Sciences and Advanced Technology Vol 2, No 2 (2019): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (716.562 KB) | DOI: 10.24853/jasat.2.2.49-52

Abstract

Steering system is a system control unit that is used for deflecting the direction of motion straight into to the left or to the right in accordance with the will of the operator. At 785-7 HD unit using the steering system type full hydraulic steering valve, where steering valve serves as a directional control valve to direct the oil flow at the time of engine working (pump work), whereas when the engine died steering valve will serve as a hand pump and directional control valve. Abnormaly steering wheel because there is a scratch on spool demand valve causing internal leakage in the demand valve so oil pressure which served as the pilot sensing to move the spool valve is a pressure demand would drop because there is a leak and could not afford to drive the spool until the full open- as a result the oil flow from the steering pump cannot be fully prioritized to steering valve to be forwarded to the steering cylinder.
Hardness Analysis of Bearing on Heat Treatment Process Kisman H Mahmud; Sri Anastasia Yudistirani; Ery Diniardi; A I Ramadhan
Journal of Applied Sciences and Advanced Technology Vol 2, No 3 (2020): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (718.311 KB) | DOI: 10.24853/jasat.2.3.59-64

Abstract

Bearing is a mechanical element that resembles a loaded shaft, so that rotation or back and forth motion can be smooth, safe and long lasting. Bearings should be sturdy and durable to allow the shaft and other machine elements to work properly. If the bearing is not working properly then the performance of the whole system will decline or not work properly. For this reason, materials from high-carbon steel bearings should be durable and durable. To obtain the desired properties of the metal, the Heat Treatment process, especially the outer and inner ring, is used. Hardness testing of the outer and inner ring of the bearing is performed after the Heat Treatment process. Testing the violence using the Digital Rockwell Hardness Tester, the value of the violence can be read directly on the scale of the tool. The Heat Treatment process of the outer and inner ring of the bearing can produce the mechanical properties that the manufacturer wants, namely Rockwell hardness 62-64 HRC. If the result of the hardness test is in accordance with the factory standard, then the outer and inner ring meet the manufacturer's quality requirements.
Co-Authors A I Ramadhan Anwar Ilmar Ramadhan Ery Diniardi Firmansyah Firmansyah Frisca Amalia Ummay Hasan Basri N Nelfiyanti Syawaluddin Syawaluddin