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All Journal Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Science and Technology Indonesia Automotive Experiences JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Jurnal Pengabdian Masyarakat Fakultas Teknik: Jurnal Abditek
Lubi, Ahmad
Unknown Affiliation
Aerospace Engineering Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Experimental Investigation of Using Thermoelectric Coolers under Different Cooling Methods as An Alternative Air Conditioning System for Car Cabin Sukarno, Ragil; Premono, Agung; Gunawan, Yohanes; Wiyono, Apri; Lubi, Ahmad
Automotive Experiences Vol 7 No 2 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11485

Abstract

The cabin car temperature will increase when parked in direct sunlight, so the energy required to cool cabin space by the air conditioner will be higher. This study aims to investigate using a thermoelectric cooling system as an alternative to a chiller system to supply cold air to the car cabin under different cooling methods for parked cars. Experimental testing of thermoelectric cooling systems was conducted to produce cold air that can be applied to car cabins as an alternative to conventional air conditioners. The thermoelectric cooling system was varied with single and double TEC modules. The double TEC modules are arranged in a series of electrical and parallel thermal arrangements. A cooling water block using a mixture of water and ethylene glycol with variations of 0.4 lpm, 0.5 lpm, and 0.6 lpm was added to the hot side of the thermoelectric module. The result shows that the thermoelectric cooling system can work properly during the 2-hour test, which constantly supplies air to the cabin space between 20-25 °C, depending on the configuration of the cooling system. The highest COP of 0.84 was obtained when using the double TEC with heatsink and added 0.5 lpm water cooling system, while the lowest COP of 0.53 was obtained when using the single TEC module without a cooling water block.
Carbon Micron-size Content Dependency in Epoxy/Carbon Composite Coated onto SPCC Plate for Automotive Bodies Protection Anggrainy, Rani; Susetyo, Ferry Budhi; Lubi, Ahmad; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Soegijono, Bambang; Ajiriyanto, Maman Kartaman; Kurniawan, Ova; Nanto, Dwi
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.989-998

Abstract

Conventional epoxy coating for surface metal corrosion protection reported many unsolved technical problems. Adding filler in the epoxy could enhance the promising properties of the composite coating. Our work describes in detail the synthesizing and characterizing epoxy/carbon composite coating. Epoxy was mixed with thinner high gloss (HG) and hardener and stirred using a stirrer apparatus. After blending, various carbons were added (1 wt. %, 3 wt. %, and 5 wt. %) and then appropriately stirred. The different mixture composite was coated onto the steel plate cold rolled coiled (SPCC) plate using high-volume low-pressure (HVLP) in two passes. Various characterizations were performed, including crystallographic orientation, Infra-Red (IR)-spectra, surface morphology, thickness, hydrophobicity, hardness, and corrosion using X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), portable dry film coating thickness (DFT), digital camera, Vickers microhardness tester, and Potentiostat, respectively. More carbon micron-sized content led to elevate the peak intensity, surface bumpiness, and hydrophobicity. The uppermost external bumpiness and hydrophobicity values are 23.51 µm and 101◦. Hardness depends on carbon content and more carbon leads to an increase in the hardness of the composited coating. The highest average Vickers hardness value is 28.24 HV. The coating thickness influenced the corrosion rate, more coating thickness promoted lesser corrosion rate. The highest coating thickness (60.8 µm) promoted a corrosion rate of around 5.65×10−4 mmpy.
APPLICATION OF JIGSAW-TYPE COOPERATIVE LEARNING MODEL TO IMPROVE LEARNING OUTCOMES Anggrainy, Rani; Tresdiawan, Rendi Ardi; Mubarak, Ibnu; Sutia, Iyep; Lubi, Ahmad
Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Vol 9, No 2 (2022): Desember 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jmee.v10i2.52725

Abstract

This study aims to (1) find out the difference in improving student learning outcomes between those who use the jigsaw-type cooperative model and students who use the lecture model, and (2) find out the increase in student learning outcomes   after applying the cooperative learning model with jigsaw type. Metode penelitian yang digunakan adalah metode eksperimental. The experimental method is used to look for a causal relationship between two factors that the researcher deliberately caused. The population in this study was all Class XI students majoring in Motorcycle Business Engineering at one of the State Vocational Schools in Bandung totaling 5 classes. The research samples were taken in two classes, namely one experimental class and one control class, the sampling technique was carried out random sampling cluster. The instruments used are test instruments and obsrvation sheets. The results showed that there was a significant difference between the learning outcomes of students who used a jigsaw-type cooperative model and students who got learning with a lecture model. The average final score of learners using the jigsaw-type cooperative model was higher than those using lectures. The N-Gain value index of the jigsaw type cooperative model category is quite effective and the lecture model of its N-Gain index category is ineffective.Keywords: Learning Model; cooperative; jigsaw; Experimental; N-Gain
RANCANG BANGUN ALAT BANTU PEMOTONGAN SEGI ENAM PADA MESIN BUBUT KONVENSIONAL UNTUK MENINGKATKAN AKURASI DAN EFISIENSI PROSES PRODUKSI Priyanto, Sugeng; Lubi, Ahmad; Anggrainy, Rani; Hari Krisyono , Danar; Muhamad Yusup , Fahmi
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 6 No 03 (2024): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v6i03.163

Abstract

The development of manufacturing technology, including in the field of lathes, continues to progress quite significantly to meet increasingly complex industrial needs. One of the important innovations in lathes was the use of detachable heads, the use of cutting tools in a more flexible and efficient way. Bolts with hexagonal holes are an important component in the automotive world, one of their uses is in motorbike calipers. After conducting a literature study regarding loose heads and drill chucks on lathe machines, the author carried out an evaluation and carried out a design for the design of an internal hexagon rotating tool on a conventional lathe using the Inventor application. Evaluation of the performance of this tool shows that this tool can be relied on for practical and educational applications, and meets the needs of its users which can be seen in the Von Mises Stress simulation results and also the results of tool testing
Distillation, Characterizations, and Testing of Distillation Products from Waste Lubricant Oil (WLO) using Compression-Ignition Engine Priyanto, Sugeng; Lubi, Ahmad; Susetyo, Ferry Budhi; Krisyono, Danar Hari; Yudanto, Sigit Dwi; Rohman, Fakhrony Sholahudin; Sudibyo, Sudibyo
Automotive Experiences Vol 7 No 3 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11497

Abstract

Waste lubricant oil is always found in motor vehicle repair shops. Utilizing waste lubricant oil by distilling it will provide benefits. For this reason, waste lubricant oil was distilled in this research. Several characterizations were conducted to determine the viscosity, density, low heat value (LHV), and flash point of waste lubricant oil and distillation products. The distillation product is less viscous, denser, LHV, and flash point than lubricant oil waste. The distillation product was mixed with Pertamina DEX (0, 5, 10, and 15 vol.%) and then filled into the fuel tank for the engine performance test. The present experiment utilized a compression-ignition (CI) engine to measure performance. CI engine speed variations were carried out at 1000, 1500, 2000, and 2500 to see the influence of the mixed fuel on torque, power, specific fuel consumption (SFC), thermal efficiency, and smoke opacity. The increase in CI engine speed leads to an increase in torque, power, thermal efficiency, and smoke opacity, but at the same time, SFC decreases to 2500 rpm. Increasing the distillation product content in the mixed fuel decreased torque, power, SFC, thermal efficiency, and increased smoke opacity.
Efek waktu tahan baja AISI 4140 terhadap struktur mikro, kekerasan, dan korosi Syamsuir; Syaripuddin; Sopiyan; Indriasti, Zulfah; Anggrainy, Rani; Lubi, Ahmad; Susetyo, Ferry Budhi
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.197

Abstract

Baja AISI 4140 merupakan baja paduan menengah yang sering digunakan dalam aplikasi teknik, termasuk pada komponen kapal, karena memiliki kekuatan tinggi dan potensi untuk ditingkatkan sifat mekaniknya melalui perlakuan panas. Penelitian ini bertujuan untuk mengkaji pengaruh variasi waktu tahan pada proses perlakuan panas terhadap perubahan struktur mikro, kekerasan, dan laju korosi baja AISI 4140. Perlakuan panas dilakukan dengan memanaskan spesimen pada suhu 800°C selama 30 menit dan 45 menit, kemudian diikuti proses quenching menggunakan oli SAE 10W-40. Spesimen tanpa perlakuan panas digunakan sebagai pembanding. Struktur mikro diamati menggunakan mikroskop optik Olympus BX51M, kekerasan diuji dengan metode Vickers menggunakan beban 5 kg, dan korosi diuji dengan metode kehilangan berat dalam larutan NaCl 3,5%. Hasil pengamatan menunjukkan bahwa semakin lama waktu penahanan, struktur mikro didominasi oleh fasa martensit yang lebih halus dan homogen. Hal ini berdampak langsung pada peningkatan kekerasan material, di mana spesimen dengan waktu tahan 45 menit menunjukkan nilai kekerasan tertinggi 658,14 HV dibandingkan spesimen lainnya. Nilai laju korosi tertinggi diperoleh Q-30 melalui pengujian selama 96 jam sebesar 38,02 mpy
PELATIHAN SOFT SKILLS BAGI SISWA SMK DI JATINEGARA KAUM UNTUK PERSIAPAN MEMASUKI DUNIA KERJA Priyanto, Sugeng; Oktaviani, Maya; Lubi, Ahmad
Jurnal Pengabdian Masyarakat Fakultas Teknik : Jurnal Abditek Vol. 3 No. 02 (2023): Jurnal Pengabdian Masyarakat Fakultas Teknik: Jurnal Abditek
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/Abditek.023.07

Abstract

Agar siswa dapat bersaing di dunia saat ini di mana kondisi kerja ditentukan oleh ekonomi global, mereka perlu mengembangkan keterampilan abad 21. Sehingga penting bagi siswa untuk memiliki soft skills guna mempersiapkan diri sebelum memasuki dunia kerja. Dengan demikian, perlu persiapan yang matang agar calon pencari kerja dapat melalui berbagai tahap tes seleksi untuk mendapatkan pekerjaan. Pelatihan soft skills bagi siswa SMK ditujukan agar siswa mendapatkan pembekalan berupa motivasi dan pemahaman tentang soft skills untuk persiapan memasuki dunia kerja. Sasaran dari kegiatan pelatihan ini adalah siswa SMK di Kelurahan Jatinegara Kaum. Kegiatan telah dilaksanakan pada September 2023, dengan melibatkan 30 siswa SMK. Langkah-langkah pelaksanaan kegiatan terdiri atas perizinan, penetapan jadwal, penyusunan konsep dan materi, pelaksanaan, evaluasi, dan penyusunan luaran kegiatan. Materi yang disampaikan meliputi tips mencari pekerjaan, contoh website yang menyediakan informasi lowongan pekerjaan, membuat daftar riwayat hidup (CV) dan resume, dan persiapan diri untuk menghadapi wawancara kerja. Kegiatan ini memberikan pengetahuan baru bagi siswa mengenai hal-hal yang perlu disiapkan saat akan mencari kerja setelah lulus sekolah. Tim pelaksana juga mendampingi siswa dalam menyusun daftar riwayat hidup dan resume. Hasil kegiatan pelatihan diharapkan bermanfaat bagi siswa secara langsung dan bagi sekolah untuk meningkatkan keterserapan lulusan.
Co-Authors Anggrainy, Rani Apri Wiyono Bambang Soegijono Cahaya Rosyidan Dwi Nanto, Dwi Ferry Budhi Susetyo Hari Krisyono , Danar Ibnu Mubarak Indriasti, Zulfah Krisyono, Danar Hari Kurniawan, Ova Maman Kartaman Ajiriyanto Muhamad Yusup , Fahmi Oktaviani, Maya Premono, Agung Rohman, Fakhrony Sholahudin Sopiyan Sudibyo Sudibyo Sugeng Priyanto, Sugeng Sukarno, Ragil Sutia, Iyep Syamsuir Syaripuddin Tresdiawan, Rendi Ardi Yohanes Gunawan, Yohanes Yudanto, Sigit Dwi