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Pressure Drop and Void Fraction of Two-Phase Flow (Air-Water) in Grooved Vertical Pipes Supa Kusuma Aji; Nicky Suwandhy A. S; Chandra Gunawan; Bayu Pranoto; Hangga Wicaksono
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.76968

Two-phase flows consisting of liquids and gases are often found in everyday life and are used on an industrial scale. In an industrial environment, this flow has many weaknesses, including pressure drop and void fraction. One strategy to reduce losses that arise is to use passive methods. The passive method used is to utilize the shape of the grooves in the channel. In this study, the flow is used to determine its effect on the pressure drop and void fraction that appears in two-phase flow. The experimental method was used for this study. The test pipe is equipped with 16 grooves, while the smooth pipe (without grooves) is used as a comparison. The test pipe is made of acrylic material. The water fluid is circulated using a centrifugal water pump with a superficial speed of 0.33-0.42 m/s. Air fluid is supplied using a compressor with superficial speeds of 0.049, 0.066, and 0.082 m/s. Measurement of pressure drop was carried out using a pressure transmitter with an Arduino data logger. The void fraction is calculated by determining the ratio of the volume fraction of water and air in the test tube. The results of the study revealed that the use of 16 grooves in the pipe can reduce the pressure drop and cavity fraction that appears when compared to smooth pipes.

PELATIHAN PEMBUATAN SARANA BERMAIN ANAK DI RW 10 KECAMATAN PAKIS KABUPATEN MALANG Nurlia Sari; Hilmi Iman Firmansyah; Nicky Suwandhy; Akhmad Faizin; Agus Dani; Zahratul Jannah
Jurnal Pengabdian Kepada Masyarakat Bersinergi Inovatif Vol. 1 No. 2 (2024): Jurnal Pengabdian Kepada Masyarakat Bersinergi Inovatif
Publisher : PT. Gelora Cipta Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61674/jpkmbi.v1i2.161

Lingkungan wilayah RW 10 Kec. Pakis, Kab. Malang merupakan lingkungan yang didalamnya terdapat banyak anak usia prasekolah dan sekolah dasar. Kurangnya sarana yang memadai bagi anak untuk bermain dengan aman dan nyaman di lingkungan setempat menjadi masalah pada lingkungan tersebut. Solusi ditawarkan pada pengabdian ini adalah memberikan sarana bermain anak di lingkungan RW Kecamatan pakis Kab. Malang. Kegiatan Pengabdian ini meliputi : Desain dan pembelian bahan baku, Pelatihan teori pengelasan, pelatihan praktek las, proses pembuatan, dan proses pemasangan. Kegiatan pengabdian ini berjalan dengan lancar.

Penggunaan Las Gesek (Friction Welding) Guna Penyambungan Dua Buah Logam Baja Karbon ST 42 pada Pengujian Tarik dan Struktur Mikro untuk Spring Pin pada Mobil Supriyanto, Nicky Suwandhy Widhi; Widi, I Komang Astana; Putra, Dicky Riyanto
JURNAL FLYWHEEL Vol 14 No 2 (2023): Jurnal Flywheel
Publisher : Teknik Mesin S1 ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/flywheel.v14i2.7731

Las Gesek atau Friction welding adalah metode pengelasan yang mengandalkan gesekan antara dua bahan logam yang saling bertemu pada bagian ujungnya dan menghasilkan percikan api, karena gesekan itu sehingga struktur pada bagian logam tersebut berada dititik leleh dan menghasilkan penyambungan antara dua buah logam, kelebihan dari Las Gesek ini adalah tidak perlu menggunakan logam pengisi seperti elektroda atau stik yang digunakan pada pengelasan lainnya. Pada kali ini penelitian yang akan dilakukan yaitu pengelasan gesek untuk penggunaan spring pin pada mobil. Pada penelitian kali ini yaitu menggunakan mesin las gesek prototype dengan variasi penekanan yaitu sebesar 5 Bar, 6 Bar, 7 Bar. Menggunakan putaran spindel sebesar 4953 rpm, pemanasan awal 30 detik, waktu pengelasan 60 detik, dan menggunakan material baja ST 42, adanya pengujian yang akan dilakukan yaitu pengujian tarik dan struktur mikro. Analisa yang akan dilakukan untuk melihat perubahan struktur pada material hasil pengelasan gesek untuk penerapan pada spring pin mobil. Akibat perlakuan panas pengelasan gesek yaitu terjadinya perubahan sifat mekanik pada material baja ST 42. Nilai tertinggi dari hasil pengujian tarik adalah 29,87 kgf/mm². Maka pengelasan gesek dengan menggunakan material baja ST 42 ini bisa sebagai alternatif pengganti dari proses yang selama ini dan dapat digunakan sebagai bahan spring pin untuk mobil.

Sosialisasi dan Pemasangan Lampu PJUTS Di Desa Gondowangi Kecamatan Wagir Kabupaten Malang Weddakarti, Eva; Ekasari, Silvia Rahmi; Perkasa, Rilis Eka; Widhi Supriyanto, Nicky Suwandhy; Nadhifatul Aini, Fica Aida; Hariyanto, Moh.Nasir
Jurnal Pengabdian Masyarakat Progresif Humanis Brainstorming Vol 6, No 4 (2023): Jurnal Abdimas PHB : Jurnal Pengabdian Masyarakat Progresif Humanis Brainstormin
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/japhb.v6i4.5693

Minimnya pemahaman masyarakat mengenai dampak negatif pembangkit listrik yang memanfaatkan bahan bakar fosil dan energi terbarukan menjadi alasan diselenggarakannya kegiatan PPM ini untuk tujuan edukasi, serta mensosialisasikan teknologi yang bernilai manfaat untuki masyarakat berupa instalasi energi surya. Penerangan Jalan Umum Tenaga Surya (PJUTS). Berdasarkan hasil survei, fasilitas penerangan umum di pintu masuk desa Gondowangi Kecamatan Wagir Kabupaten Malang sangat sedikit sehingga aktivitas masyarakat pada malam hari kurang maksimal. Tujuan dari kegiatan PPM ini adalah menyediakan sistem PJU berbasis sel surya untuk mengakomodasi kegiatan Masyarakat pada malam hari. Ada dua hasil yang dicapai dari kegiatan PPM ini, yaitu mengedukasi masyaraat mengenai energi terbarukan dan efisiensi penggunaan energi guna mengurangi dampak buruk lingkungan akibat pembangkit listrik fosil. Kegiatan ini merupakan Pembangunan berkelanjutan. Selain itu, penyediaan lampu PJUTS sangat membantu masyarakat dalam beraktivitas di malam hari dan menciptakan kondisi yang lebih kondusif di masyarakat.

SIMULATION OF THE INFLUENCE OF FIBER VOLUME FRACTION AND FIBER ORIENTATION ON THE STRENGTH OF POLYESTER COMPOSITE REINFORCED WITH GLASS FIBER IN BENDING STRENGTH Fakhruddin, Muhammad; Mashudi, Imam; Pramita Sari, Nurlia; Widhi Supriyanto, Nicky Suwandhy
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.79-86

Fiber-reinforced composites can be classified into two parts, namely short fiber composites and long fiber composites. Long fibers are generally stronger than short fibers. Long fiber (continuous fiber) is more efficient in laying than short fiber but short fiber is easier to lay than long fiber. Fiber length affects the processability of the fiber composite. Judging from the theory, long fibers can transfer the load and stress from the stress point to the other fiber. In this research, we simulated the effects of volume fraction and fiber orientation in glass fiber-reinforced polyester composites on bending strength to examine the effect of each parameter on the mechanical properties of glass fiber composites. The mechanical properties of the composite were tested using the three-point bending and tensile testing methods. The study expects to find variations in mechanical properties with changes in the glass fiber volume fraction and fiber orientation. In this study, it is planned to function in a relevant environment, the components in this study must be able to operate properly and have been well integrated with prototype manufacturing that has been tested as a test tool function. Notably, the pinnacle of the bending test, measuring 170.41 MPa, was achieved at the specific combination of a 0.5 Fiber Volume Fraction and the 0-90o fiber orientation.

Design and Manufacture of Speedometer Covers using the House of Quality (HOQ) Approach Faizal, Elka; Sari, Nurlia Pramita; Wicaksono, Hangga; Pranoto, Bayu; Supriyanto, Nicky Suwandhy Widhi; Subagiyo, Subagiyo
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7119

This study aims to design and fabricate a speedometer cover for Yamaha Aerox and N-Max 155 motorcycles using 3D printing technology, guided by the House of Quality (HOQ) framework. The increasing consumer demand for motorcycle accessories motivated this research. A structured design process was implemented, beginning with a consumer needs analysis conducted through questionnaires and surveys to identify user expectations. These needs were systematically translated into technical requirements using the HOQ method. The design stage utilized 3D CAD modeling and 3D scanning to ensure accurate fitting to the speedometer unit, followed by prototyping using fused deposition modeling (FDM) 3D printing. The final prototype exhibited key consumer-desired attributes such as heat resistance, structural durability, and a secure fit. Results indicate that integrating the HOQ approach with digital fabrication methods effectively aligns product design with user expectations. This study demonstrates the potential for further development of customizable motorcycle accessories using a consumer-driven and technology-supported design process.

Experimental Investigation of Air-to-Kapok Oil Ratio Effects on Flame Height and Morphology in a Bunsen Burner Pranoto, Bayu; Supriyanto, Nicky Suwandhy Widhi; Gunawan, Chandra; Aji, Supa Kusuma; Huda, Muhammad Arif Nur
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7120

The growing global demand for energy highlights the limitations of fossil fuel resources. This makes innovation in alternative energy development crucial, and one promising avenue is the use of vegetable oils like kapok oil. Kapok oil has a complex chemical composition, composed of various triglycerides of fatty acids and glycerol, where each fatty acid component contributes unique combustion characteristics. The interaction of the complexity of this content as a whole affects the flame pattern of kapok oil. Furthermore, the air-fuel mixture ratio (AFR) plays a significant role in determining the characteristics of the resulting flame. Therefore, this study aims to explore in depth the effect of AFR variations on the combustion characteristics of kapok oil. Experiments were conducted by burning a mixture of kapok oil vapor and air on a burner with controlled AFR settings. The results showed that the variation of AFR significantly changed the flame height and morphology. Flame height initially increased with increasing AFR (from 1.34 cm at AFR 0.143:1 to 4.429 cm at AFR 1.526:1) before decreasing (to 0.264 cm at AFR 4.011:1) until it reached the lift-off condition and went out.

Design of Mid-Drive Motor Bracket for Electric Bicycles Harijono, Agus; Mufarrih, AM; Pratama, Rizki Priya; Supriyanto, Nicky Suwandhy Widhi
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 6 No 3 (2024): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v6i3.342

Mid-drive electric bikes have become the favorite choice of many riders thanks to their balanced weight distribution and superior ability to traverse hilly terrain. However, the price of this type of bicycle is still quite high compared to hub drive electric bicycles. This research aims to design an innovative bracket that allows the integration of the hub drive motor from the Ninebot ES into a mid-drive driver. By redesigning this bracket, we hope to improve the bike's performance and efficiency, especially on hills. Bracket design is carried out by considering the dimensions of the motorbike, chainring position, and structural strength to withstand the resulting force and torque. Prototype test results show good stability when driving straight and the ability to reach a maximum speed of 30 km/h on flat roads. Meanwhile, on roads with a slope of 10°, this electric bicycle reaches a maximum speed of 10 km/hour. This bracket design offers an attractive solution for users who want to improve the performance of their electric bike without having to invest in an expensive mid-drive BLDC motor. Further development could involve adding a gearbox to increase torque while reducing motor power consumption. Sepeda listrik mid-drive telah menjadi pilihan favorit banyak pengendara berkat distribusi berat yang seimbang dan kemampuannya yang unggul untuk melintasi medan berbukit. Meskipun demikian, harga sepeda jenis ini masih cukup tinggi dibandingkan sepeda listrik hub drive. Penelitian ini bertujuan untuk merancang bracket inovatif yang memungkinkan integrasi motor hub drive dari Ninebot ES menjadi penggerak mid-drive. Dengan mendesain bracket ini, diharapkan dapat meningkatkan performa dan efisiensi sepeda, terutama pada tanjakan. Perancangan bracket dilakukan dengan mempertimbangkan dimensi motor, posisi chainring, dan kekuatan struktural untuk menahan gaya serta torsi yang dihasilkan. Hasil pengujian prototipe menunjukkan stabilitas yang baik saat melaju lurus dan kemampuan mencapai kecepatan maksimum 30 km/jam di jalan datar. Sedangkan untuk jalan dengan kemiringan 10°, sepeda listrik ini mencapai kecepatan maksimum 10 km/jam. Desain bracket ini menawarkan solusi yang menarik bagi pengguna yang ingin meningkatkan performa sepeda listrik mereka tanpa harus berinvestasi pada motor BLDC mid-drive yang mahal. Pengembangan lebih lanjut dapat menambahkan gearbox untuk meningkatkan torsi sekaligus mengurangi konsumsi daya motor.

SIMULATION OF THE INFLUENCE OF FIBER VOLUME FRACTION AND FIBER ORIENTATION ON THE STRENGTH OF POLYESTER COMPOSITE REINFORCED WITH GLASS FIBER IN BENDING STRENGTH Fakhruddin, Muhammad; Mashudi, Imam; Pramita Sari, Nurlia; Widhi Supriyanto, Nicky Suwandhy
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.79-86

Fiber-reinforced composites can be classified into two parts, namely short fiber composites and long fiber composites. Long fibers are generally stronger than short fibers. Long fiber (continuous fiber) is more efficient in laying than short fiber but short fiber is easier to lay than long fiber. Fiber length affects the processability of the fiber composite. Judging from the theory, long fibers can transfer the load and stress from the stress point to the other fiber. In this research, we simulated the effects of volume fraction and fiber orientation in glass fiber-reinforced polyester composites on bending strength to examine the effect of each parameter on the mechanical properties of glass fiber composites. The mechanical properties of the composite were tested using the three-point bending and tensile testing methods. The study expects to find variations in mechanical properties with changes in the glass fiber volume fraction and fiber orientation. In this study, it is planned to function in a relevant environment, the components in this study must be able to operate properly and have been well integrated with prototype manufacturing that has been tested as a test tool function. Notably, the pinnacle of the bending test, measuring 170.41 MPa, was achieved at the specific combination of a 0.5 Fiber Volume Fraction and the 0-90o fiber orientation.

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