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All Journal Jurnal Rekayasa Proses Rekayasa Mesin JURNAL INTEGRASI INOVTEK POLBENG Jurnal Rekayasa Proses Buletin Profesi Insinyur Jurnal Teknologi dan Riset Terapan (JATRA) International Journal of Marine Engineering Innovation and Research DEVICE Journal of Engineering and Applied Technology Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam Prosiding Seminar Nasional Sisfotek (Sistem Informasi dan Teknologi Informasi) Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Journal of Applied Mechanical Engineering and Renewable Energy (JAMERE) Proceeding Applied Business and Engineering Conference Jurnal Profesi Insinyur Indonesia Jurnal Rekayasa Proses
Hanifah Widiastuti
Politeknik Negeri Batam
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Studi Kelayakan Pembangunan Pembangkit Listrik Tenaga Surya Terapung pada Waduk Sumber Air Minum di Batam Cinantya, Prajwalita; Widiastuti, Hanifah; Lumombo, Liony
Jurnal Profesi Insinyur Indonesia Vol 2, No 2 (2024): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2024.21723

Abstract

Kebutuhan akan pasokan listrik di Kota Batam sebagai pusat industri kian meningkat, hal ini perlu diimbangi dengan ketersediaan listrik agar tidak terjadi defisit dalam neraca listrik. Salah satu suplai ketersediaan pembangkit tersebut adalah melalui energi baru terbarukan yaitu Pembangkit Listrik Tenaga Surya (PLTS). PLTS membutuhkan lahan yang cukup luas, sedangkan Kota Batam memiliki keterbatasan. Penempatan PLTS pada permukaan waduk sebagai sumber air minum di Batam dapat dijadikan alternatif yakni pada waduk Duriangkang dan waduk Tembesi. Studi ini untuk mengetahui kelayakan PLTS di waduk Duriangkang dan waduk Tembesi melalui desain PLTS terapung, dampak lingkungan dan kelayakan ekonomi. Kata kunci: Energi Baru Terbarukan, Pembangkit Listrik Tenaga Surya
Experimental study: coolant viscosity's impact on Inconel 600's surface roughness measured using a refractometer Pujo Leksonowati, Nur Fitria; Pamungkas, Nurman; Manurung, Meilani Mandalena; Batubara, Ninda Hardina; Widiastuti, Hanifah
Journal of Engineering and Applied Technology Vol. 5 No. 1 (2024): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v5i1.71254

Abstract

This paper presents an experimental study on the impact of coolant viscosity on the surface roughness of Inconel 600 material processed using a lathe. This research employs sequential experimental methods, encompassing a coolant viscosity test, specimen machining with a lathe, and surface roughness test. The standard for the roughness grade number is defined by ISO 1302. The study effectively demonstrates the use of a refractometer as a reliable and practical alternative for determining coolant quality in % Brix units, which strongly correlates with coolant viscosity. The research findings reveal that an increase in coolant viscosity results in a smoother surface roughness of the workpiece, while a decrease leads to an increase in surface roughness. Specifically, the average viscosity of 8%, 10%, and 13% Brix coolant results in an average surface roughness of Ra 11.83 μm, Ra 10.09 μm, and Ra 7.23 μm, respectively. The average roughness grade number based on this study is N9 - N10. However, the study also identifies the need for further mathematical calculations to establish a link between coolant concentration, % Brix, and coolant viscosity. This opens up an intriguing avenue for future research and holds the potential to significantly enhance our understanding of the relationship between these variables.
Comparative study of nyamplung (Callophylum inophyllum) kernel oil obtained from mechanical and chemical extraction for biofuel production Hanifah Widiastuti; Meiti Pratiwi; Godlief F. Neonufa; Tatang H. Soerawidjaja; Tirto Prakoso
Jurnal Rekayasa Proses Vol 13 No 2 (2019): Volume 13, Number 2, 2019
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.42816

Abstract

Nyamplung (Callophylum inophyllum) contains oil around 40-73% in its seed. It has recently gained recognition as a potential source for biofuel production. The oil recovery process from renewable sources such as nyamplung is widely carried out by using chemical extraction with solvents. Nevertheless, this method is considered costly and there are safety issues as well as environmental concerns related to the solvents used. Therefore, mechanical extraction has emerged as an alternative method. In this study, the nyamplung oil recovered by mechanical extraction via hydraulic press and chemical extraction utilizing Soxhlet extraction was compared. Soxhlet extraction was carried out by using n-hexane as a solvent with a temperature of 70 oC for 5 hours. Before the extraction process, the kernel was initially pretreated to reduce the particle sizes and the water content. The results show that the oil yield recovered using the hydraulic press is 58%, which is comparable with the value obtained from Soxhlet extraction (65%). The oil characteristics were also compared, and the profiling shows no significant difference in the properties (saponification value, acid value, and iodine value) of oils recovered using both methods. The composition of fatty acids was also analyzed for utilization as a biofuel feedstock. Higher content of oleic acid was observed in oil resulted from chemical extraction while mechanical extraction yielded oil with higher palmitic acid content.
Analisis Crack Pada Robot Exoskeleton Lower LIMB Pamungkas, Daniel Sutopo; Fadhil Al Fadjri, Muhammad; Widiastuti, Hanifah
Journal of Applied Mechanical Engineering and Renewable Energy Vol 5 No 1: February 2025
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jamere.v5i1.1022

Abstract

Failure due to material fatigue can be potentially fatal as it may lead to fractures without any initial detectable deformation. Factors such as high maximum load and large stress cycles accelerate the material fatigue process. In the design of a lower limb exoskeleton robot, the strength and safety of the robot are primary focuses, particularly in the Link Joint mechanism. The comfort and safety of the structure are determined by the geometry and type of material used. Analysis using Fracture Mechanics is employed to evaluate cracks in the Link Joint mechanical structure, with the calculation of the Stress Intensity Factor (SIF) value as an indicator of the stress intensity on the crack due to load. This research aims to identify critical stress and estimate the service life of the mechanism through testing using Finite Element Method-based software, specifically Solidworks 2020.
Perancangan dan Analisis Performa 3D Printer Cartesian Setyoadi, Yuris; Hermana, Rifki; Hakim, Rahman; Riyadi, Achmad Didi; Widiastuti, Hanifah
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 5 No. 2 (2023): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2023
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v5i2.5057

Abstract

3D printer technology offers the capability to print 3D objects with nearly perfect accuracy, making it a crucial tool in the industry for rapid prototyping. This study employs an experimental approach to design a Cartesian 3D Printer with a printing area of X-axis 150 mm, Y-axis 150 mm, and Z-axis 200 mm, and subsequently compares the printing accuracy with the Anycubic Mega Zero 3D printer, which has a printing area of X-axis 220 mm, Y-axis 220 mm, and Z-axis 250 mm. Both machines underwent testing by printing block specimens 10 times each. The printing results revealed several specimens that did not meet the specified tolerance limits. In the Cartesian 3D Printer, three dimensional measurements exceeded tolerance levels in specimens 7 and 8, specifically in length, width, and height dimensions. Meanwhile, in the Anycubic Mega Zero 3D Printer, five measurements exceeded tolerance limits in specimens 6, 8, and 9, with one width dimension and two length and height dimensions. From these findings, it can be concluded that the Cartesian 3D Printer demonstrates higher accuracy compared to the Anycubic Mega Zero 3D Printer.
PEMODELAN DAN ANALISIS EYEBOLT TERHADAP BEBAN DAN SUDUT ANGKAT MENGGUNAKAN FINITE ELEMENT ANALYSIS Fathurrahman; Widiastuti, Hanifah; Albana, Muhammad Hasan
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2025): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v6i2.2556

Abstract

Eyebolt berperan sebagai bagian dari komponen pengangkatan peralatan yang dibutuhkan dalam proses pemindahan peralatan berat. Meskipun demikian, eyebolt memiliki potensi kegagalan yang tinggi akibat dari ketidaksesuaian standar sudut pengangkatan yang akhirnya berakibat pada kerusakan eyebolt. Penelitian ini akan memfokuskan kepada analisis pembebanan terhadap eyebolt dari variasi sudut pengangkatan yang diberlakukan. Sehingga penelitian ini diharapkan dapat digunakan sebagai media pembelajaran untuk pengaplikasian Eyebolt dalam aktivitas pengangkatan komponen peralatan berat di kemudian hari. Simulasi Finite Element Analysis (FEA) merupakan metode numerik komputasi untuk mengetahui perilaku suatu material atau struktur ketika diberi pembebanan. Dalam penelitian ini akan mensimulasikan tiga skenario pembebanan dengan variasi sudut berbeda, yaitu 90°, 75°, 45°, dan 30° terhadap Eyebolt Australian Standard 2371:2018 for eyebolt grade 4. Parameter yang diamati dalam penelitian kali ini berfokus pada perbandingan dari faktor deformasi material, factor of safety, tegangan dan regangan yang mempengaruhi aspek kesuksesan pengangkatan.
Pelatihan Penyusunan Dokumen Sertifikasi Halal Bagi UMKM di Kota Batam Kurniawan, Ded; Setiyanto, Adi Irawan; Darmawan, Arif; Ansori, Muslim; Restu, Fedia; Aprilia, Elin; Widiastuti, Hanifah; Zaenuddin, Muhammad; Wijayanti, Ita; Rasarandi, Farouki Dinda
Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam Vol. 5 No. 1 (2023): Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/abdimaspolibatam.v5i1.4558

Abstract

This service activity has two objectives. First, increasing the understanding of halal certification for MSMEs in Batam City. Second, helping SMEs in Batam City to prepare halal certification documents. This activity is carried out to overcome problems in MSMEs regarding the management of halal certification. This activity is expected to be useful for MSME Managers so that they understand the urgency of halal products, then MSME products are halal certified, and finally as a means of student learning. Based on the results of the assistance, many MSMEs want to take care of halal certification but are still confused about the preparation. This activity contains socialization, training, and mentoring. Assistance is provided to 6 (six) business units.
Pelatihan Pendamping Proses Produk Halal Ulfah, Nurul; Widiastuti, Hanifah; Thohari, Ahmad Hamim; Zaenuddin, Muhammad; Fajrin, Aulia; Purba, Adi Syahputra; Batubara, Ninda Hardina; Stefani, Windy; Hidayat, Imam; Wirawan, Adhitomo
Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam Vol. 5 No. 1 (2023): Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/abdimaspolibatam.v5i1.4865

Abstract

Halal products are products that are starting to be looked at by the market today. One of the goals of the Indonesian government, under BPJPH, in 2024 it is hoped that products, especially food and beverages in Indonesia, will already have halal certificates so that they can increase the attractiveness of pariwasata for Muslims around the world if they visit Indonesia. Based on the new legislation in 2014, namely law no. 33 of 2014 concerning Halal Product Guarantee, the halal certification process is carried out in synergy by various parties, one of which is the halal product guarantee organizing body (BPJPH). Halal product process assistance is a process of verifying and validating halal statements by business actors (self-declare). This activity serves to assist micro and small business actors in meeting product halal requirements. The purpose of this community service is to find out the level of understanding of prospective halal product process assistants in Batam City, service activities are carried out with 3 stages, namely surveys, socialization and training activities and the last stage is evaluation and reports. This activity is supported by BPJPH and Bank Indonesia as additional sponsors for activities to be carried out offline and online.
Rancang Bangun Kerangka Tanaman Hidroponik Politeknik Negeri Batam Pamungkas, Nurman; Widiastuti, Hanifah; Restu, Fedia; Leksonowati, Nur Fitria Pujo; Arifin, Nurul Laili; Muvariz, Mufti Fathonah; Ulfah, Nurul; Widodo, Widodo; Baharudin, Budi; Fajrin, Aulia; Fyona, Annisa; Kamsyah, Domi; Gemala, Mega; Rosbandrio, Wowo; Aryswan, Adhe; Siregar, James; Saputra, Hendra; Irawan, Benny Haddli; Saputra, Ihsan; Ariyanto, Nugroho Pratomo; Mutiarani, Mutiarani
Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam Vol. 5 No. 1 (2023): Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/abdimaspolibatam.v5i1.4866

Abstract

The hydroponic pilot project in the Batam State Polytechnic area was motivated by problems with economic conditions and declining health conditions during the Covid-19 pandemic. This project is expected to support the "growing your own food movement" in an effort to reduce unemployment, increase food security and a healthy lifestyle. The hydroponic method was chosen because it is very easy to do and does not require a large area of "‹"‹land. In this community service activity, a hydroponic plant building framework will be made as a prototype of an efficient and efficient hydroponic building so that it can be used by the wider community. This activity is also useful for applying design knowledge as one of the PbL activities carried out by CAD, CNC, CAM, and Fabrication Engineering courses in the Mechanical Engineering Department, so that it can become an arena for higher education participation to support people's lives. The method of implementing this community service activity is to make observations to find a suitable area to build a hydroponic plant house, then the results of the observations are poured in the form of a design by utilizing software so that the materials needed and the shape of the framework that is built can be known. The last activity is making a hydroponic plant place. This activity is planned to be carried out from April to November 2021. Based on the results of the evaluation of the service program questionnaire for product distribution, it is known that the majority of respondents are satisfied with the products produced.
ANALISIS PENGARUH SUDUT MASUK HALUAN TERHADAP HAMBATAN KAPAL MENGGUNAKAN SOFTWARE MAXSURF Perkasa, Veryawan Nanda; Ita Wijayanti; Hanifah Widiastuti; Meschac Timothee Silalahi
Device Vol. 15 No. 2 (2025): Bulan November
Publisher : Fakultas Teknik dan Ilmu Komputer (FASTIKOM) UNSIQ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/6f2scr33

Abstract

Optimasi geometri lambung kapal merupakan strategi krusial untuk meningkatkan efisiensi hidrodinamis dan mengurangi konsumsi bahan bakar dalam industri maritim modern. Penelitian ini menginvestigasi pengaruh variasi sudut masuk haluan (entrance angle) terhadap karakteristik hambatan kapal displacement melalui simulasi numerik sistematis menggunakan Maxsurf Resistance dengan metode slenderbody. Empat model kapal dengan sudut masuk 15°, 20°, 25°, dan 30° dianalisis secara komprehensif pada rentang kecepatan operasional 15-25 knot (bilangan Froude 0,45-0,75), mencakup 44 kondisi simulasi. Model kapal memiliki panjang keseluruhan 30 meter, lebar 8 meter, sarat 2,5 meter, displacement 319 ton, dan koefisien blok 0,52, merepresentasikan kapal patroli dan kapal penyeberangan cepat yang beroperasi di perairan Indonesia. Hasil penelitian menunjukkan bahwa sudut masuk haluan memiliki pengaruh sangat signifikan terhadap total hambatan, dengan magnitude pengaruh yang meningkat pada kecepatan tinggi. Model dengan sudut masuk 15° menghasilkan hambatan terendah secara konsisten di seluruh rentang kecepatan yang diuji. Pada kecepatan 20 knot, model 15° menghasilkan hambatan 193,7 kN dibandingkan 285,0 kN untuk model 30°, menunjukkan perbedaan substansial sebesar 47,1% atau 91,3 kN. Analisis mekanisme fisika mengungkapkan bahwa sudut masuk yang lebih tajam menghasilkan karakteristik pembentukan gelombang yang lebih efisien dengan amplitudo bow wave lebih rendah, sistem gelombang yang lebih terorganisir, dan interferensi gelombang yang menguntungkan. Sensitivitas hambatan terhadap sudut masuk meningkat pada kecepatan tinggi (Fn > 0,60) dimana hambatan gelombang menjadi komponen dominan. Untuk kapal cepat dengan kecepatan operasional 20-25 knot, sudut masuk 15-20° direkomendasikan untuk minimisasi hambatan dan optimisasi efisiensi bahan bakar, dengan potensi penghematan operasional jutaan dollar selama lifecycle kapal
Co-Authors Abda Abda Adhe Aryswan Adhitomo Wirawan Adi Irawan Setiyanto Adi S.P Adi Syahputra Purba Ahmad Hamim Thohari Andy Parulian Siregar Annisa Fyona Aprilia, Elin Ari Wibowo Ari Wibowo Arif Darmawan Aulia Fajrin Auliana Diah Wilujeng Baehaqi Baharudin, Budi Bambang Sahputra Batubara, Ninda Hardina Benny Hadli Irawan Budi Baharudin Budi Baharudin Cahyo Budi Nugroho Cinantya, Prajwalita Daniel Sutopo Pamungkas, Daniel Sutopo Dety Febrianti Domi Kamsyah Fadhil Al Fadjri, Muhammad Fajrin, Aulia Fathurrahman Fedia Restu Godlief F. Neonufa Hendra Saputra Hendra Saputra Hermana, Rifki Ihsan Saputra Irawan, Benny Haddli Ita Wijayanti James Siregar Kurniawan, Ded Lalu Giat Juangsa Putra Liony Lumombo Luthfiya Ratna Sari Manurung, Meilani Mandalena Mega Gemala Meida Perwira Antartika Meiti Pratiwi Meschac Timothee Silalahi Mufti Fathonah M Mufti Fathonah Muvariz Muhammad Hasan Albana Muhammad Ismail Muhammad Zaenuddin Muhammad Zainuddin Lubis Muslim Ansori MUTIARANI MUTIARANI Mutiarani Mutiarani Naufal Abdurrahman Naufal Abdurrahman Naufal Abdurrahman Prasetyo Nidia Yuniarsih Nidia Yuninarsih Ninda H.B Nisrina Afifah Novianti Nugroho Pratomo Ariyanto Nugroho Pratomo Aryanto Nur Fitria Pujo Leksonowati Nurman Pamungkas Nurul Laili Arifin Nurul Ulfah Nurul Ulfah Parlin Jhony Haposan Siagian Perkasa, Veryawan Nanda Rahman Hakim Rahman Hakim Rahman Hakim Rahman Hakim Rahman Hakim Rahman Hakim Rasarandi, Farouki Dinda Riyadi, Achmad Didi Rosbandrio, Wowo Saprin Epraim Surbakti Sapto Wiratno Satoto Silaban, Andre Kevil Siregar, James Tatang H. Soerawidjaja Tatang Hernas Soerawidjaja Tirto Prakoso Veryawan Nanda Perkasa Widodo Widodo Widodo Widodo Widodo Windy Stefani Wowo Rossbandrio Yogantara Yogantara Yudy Pratama Yuris Setyoadi