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All Journal Traksi : Majalah Ilmiah Teknik Mesin Jurnal Teknoin TEKNIK Rotasi Jurnal Ilmu Lingkungan JURNAL TEKNIK MESIN Jurnal Simetris Media Mesin: Majalah Teknik Mesin Jurnal Rekayasa Mesin JMPM (Jurnal Material dan Proses Manufaktur) Journal of Energy, Mechanical, Material and Manufacturing Engineering Mesin Jurnal Metalurgi dan Material Indonesia JURNAL CRANKSHAFT Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika Jurnal Material Teknologi Proses: Warta Kemajuan Bidang Material Teknik Teknologi Proses Eksergi: Jurnal Teknik Energi SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Jurnal Profesi Insinyur Indonesia Jurnal Sosial Ekonomi Perikanan Journal of Engineering and Technological Sciences

Agus Suprihanto

Mechanical Engineering Departement Diponegoro University Semarang - Indonesia

Author-ID : 393901

Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Transportation

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Magnetic Properties of Austenitic Stainless Steel 316l and 316lvm after High Temperature Gas Nitriding Treatment Suprihanto, Agus
ROTASI Vol 19, No 2 (2017): VOLUME 19, NOMOR 2, APRIL 2017
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Biometallic materials for implant devices not only have to good corrosion resistance but also stable nonmagnetic properties. Various method have been developed for enhanced the corrosion resistance i.e low temperature gas nitriding treatments. Unfortunatelly, low temperature gas nitriding produce weakly ferromagnetic due the presence of expanded austenitic phases. Another treatments methods which is capable for improvement the mechanical properties is high temperature gas nitriding. However, the evaluation of magnetic properties of austenitic stainless steel 316L and 316LVM not yet investigation. The evaluation of magnetic properties of austenitis stainless steel 316L and 316LVM after high temperature gas nitriding treatments have been succesfully done. The magnetic properties are evaluated by vibrating sample magnetometre (VSM) test. The magnetic properties such as magnetic remenance, magnetic saturation and magnetic permeability are improved. As treated 316L and 316LVM have more stable non-magnetic properties and they more safe and compatible for MRI test

PENGUJIAN MEKANIK DAN FISIK PADA METAL MATRIX COMPOSITE (MMC) ALUMINIUM FLY ASH Suprihanto, Agus; Setyana, Budi
ROTASI Volume 8, Nomor 4, Oktober 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Fly ash (abu terbang) merupakan salah satu hasil sisa (limbah) batubara yang diperoleh dari penyaringan gas yang dikeluarkan dari saluran pembuangan pada suatu power plant. Berton-ton fly ash yang semakin menumpuk setiap tahunnya dibiarkan begitu saja sehingga menimbulkan polusi bagi lingkungan bahkan manusia. Oleh sebab itu diperlukan solusi untuk menaggulangi masalah ini. Penelitian yang dilakukan menunjukkan bahwa ternyata fly ash ini mempunyai sifat fisik dan kimia yang berguna dalam material konstruksi dan industri. Aluminium yang merupakan salah satu material yang banyak digunakan manusia di jadikan sebagai matriks bagi pemanfaatan fly ash yang salah satunya berfungsi sebagai partikel penguat (reinforcement). Penggunaan fly ash ini diharapkan dapat meningkatkan sifat mekanik dari aluminium. Untuk mengetahui seberapa besar pengaruh penambahan fly ash ini terhadap sifat mekanik aluminium maka dalam tugas sarjana ini dilakukan pengujian tarik, impak dan kekerasan, sedangkan pengujian koefisien muai linear, konduktivitas termal dan densitas dilakukan sebagai pengujian sifat fisik, dimana sebelumnya dilakukan proses pembuatan komposit aluminium fly ash dengan metode stir casting. Dengan mengunakan variasi awal persentase berat fly ash sebesar 5%, 10% dan 15%, dapat diketahui bahwa nilai kekuatan tarik, impak dan kekerasan cenderung meningkat seiring dengan semakin besar persentase penambahan fly ash dan terjadi penurunan nilai koefisien muai, konduktivitas termal dan densitas seiring dengan semakin besar persentase penambahan fly ash

PENGARUH PENAMBAHAN KROMIUM DAN TEMBAGA TERHADAP KEKUATAN LELAH BESI COR KELABU Suprihanto, Agus; Suratman, Rochim
ROTASI Volume 8, Nomor 1, Januari 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

The mechanical properties of grey cast irons can be modified with alloying elements. Cr and Cu have beenknown as elements that can improve tensile strength of grey cast irons. The improvement of tensile strength can beinfluence of fatigue strength. The goal of this research is to study the effect of alloying Cr and Cu on the fatiguestrength.Four materials of grey cast irons have been conducted to high cycle fatigue testing on the rotating bendingmachine. The first material is grey cast irons without added Cr and Cu, and the other have added. The percentages ofCr have been added are 0,23% wt, 0,32%wt and 0,47%wt and Cu 0,6%wt to 0,7%wt. The metallographyc examinationsand tensile test also have been conducted.The result of this research are the material has the same microstructure. The microstructures of its materials arepearlitic grey cast irons with graphite type VII, distribution A and size of graphite 3-5. The tensile, endurance andfatigue strength of materials, which added Cr and Cu significantly rising, compared with base materials. The tensilestrength rose from 191MPa to 232MPa and the endurance strength raised from 94 MPa to 110MPa. However threemodified materials, which added Cr, and Cu has the same effects.

Dampak Kemiringan Dinding Silo Terhadap Distribusi Tegangan Dinding pada Corrugated Steel Silo Berkapasitas 4650 Ton Widyanto, Susilo Adi; Sukamta, Sukamta; Yurianto, Yurianto; Suprihanto, Agus
ROTASI Vol 20, No 2 (2018): VOLUME 20, NOMOR 2, APRIL 2018
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Konstruksi silo dirancang untuk menyimpan butiran. Idealnya sumbu vertikal silo maupun dindingnya tegak lurus terhadap bidang dasarnya sehingga beban dinding hanya berupa gaya radial akibat ketinggian kolomnya.Â Miringnya konstruksi silo menyebabkan terjadinya beban gabungan pada dinding pada arah kemiringannya. Paper ini membahas pengaruh kemiringan konstruksi silo pada gaya yang bekerja pada dinding. Silo yang diobservasi dengan kapasitas penyimpanan sebesar 4650 ton, dengan diameter 19 m dengan ketinggian 20 m. Dari hasil pemodelan FEM, distribusi tegangan pada dinding yang berbeda ketebalannya relatif lebih besar dibandingkan tegangan yang terjadi pada dinding ganda pada bagian dibawahnya. Tegangan maksimum terjadi pada daerah sambungan baut antara dinding dan stiffener. Pada kemiringan 10o tegangan maksimum dinding mencapai sekitar 45 kg/mm2 baik pada dinding ganda maupun di lokasi dinding yang berbeda ketebalannya.

PROSES REHEATING BILLET DAN THIXOCASTING PADUAN Al-18Si BERSTRUKTUR NON-DENDRITIC Suprihanto, Agus; Satrijo, Djoeli
ROTASI Volume 9, Nomor 2, April 2007
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

One of the important steps in semi-solid forming (SSF) especially thixoforming is the reheating process to achieve the required semisolid state of the billet. The reheating process is not only necessary to achieve the required semi-solid state of the billet, but also to control the microstructure of the billet. In the reheating process, billets are heated up to the temperature between the solidus and liquidus of the alloy to obtain accurately controlled solid fraction and spherical particles uniformly dispersed. The process variables such as reheating time, reheating temperature, reheating holding time, and induction heating power have much effects on the quality of the reheated billets. It is difficult to consider all the variables at the same time to predict the billet quality. In this paper, the process variables focused on reheating temperature and reheating holding time to see the correlation relationship between the process variables and the conditions of the billet quantitatively, and then simulate the thixocasting process to know the correlation relationship between the process variables and properties of the materials, which is the flow ability of the billet and the hardness of the thixocasting products. The alloys used in this experiment is non-dendritic Al-18Si alloy which formed used mechanical stirring method.

The relationship between heel pad compressibility index, age, body mass index and foot area contact in calcanea spur patients Wibowo, Dwi Basuki; Suprihanto, Agus; Haryadi, Gunawan Dwi
ROTASI Vol 22, No 3 (2020): VOLUME 22, NOMOR 3, JULI 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.3.188-193

This study was performed to investigate the relationship between heel pad compressibility index (HPCI), age, body mass index (BMI) and (FAC) for calcanea/heel spur patients. Thirteen patients with a symptomatic heel spur (3 males and 10 females) participated in this study. The HPCI increased with age and HPCI of the elderly is greater than the adult. The HPCI increased with pain minimum compressive pressure (PMCP) indicated HPCI are all significantly greater in patients with plantar heel pain than in normal subjects. The BMI increased with FAC is caused by BMI and FAC of males is greater than females. The PMCP decreased with BMI indicated that patient with excessive body mass will make experience more pain. The result of pain measurement showed that there are 7 patients who indicated the abnormality (the PMCP value is lower than 2 kg/cm2). From this study, it can be concluded that the quantitatively pain level is worst when PMCP< 2.0 kg/cm2, it is severe when 3.0> PMCP â‰¥ 2.0 kg/cm2 and it is moderate when PMCPâ‰¥3.0 kg/cm2

Transformasi Digital di Pembangkit Listrik di Indonesia: Kajian dari Sisi SDM dan Teknologi Paryanto, P; Indrawan, Harry; Cahyo, Nur; Aisyah, Siti; Suprihanto, Agus; Sulardjaka, S
ROTASI Vol 23, No 2 (2021): VOLUME 23, NOMOR 2, APRIL 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.2.%p

In 2021, several power plants in Indonesia have been started a digital transformation to increase efficiency and reduce operating costs. Therefore, in order to accelerate and ensure the sustainability of the transformation, it is necessary to analysis the readiness of human capital and its technology/systems. In this research, methods that are used are: survey, discussion, and verification of several power plants in Indonesia regarding their readiness and conditions. The result of the study shows that its need to increase digital competencies and open mindset of existing employees at the power plant, both at operator and management level. The digital transformation of Indonesian power plants requires an upskilling program for the employee, which is needed to create appropriate digital innovation and accelerate the digitization project. Otherwise, in terms of technology, it needs to increase cybersecurity, useability, and interoperability of the digital technologies. Although cyber security in power plants is sufficient, it needs to standardize the OT/IT connection. Â Â

Perhitungan Lifetime Prediction Pada Komponen Kritis Centrifugal Pump Menggunakan Metode Weibull Haryadi, Gunawan Dwi; Suprihanto, Agus; Butarbutar, Martin
ROTASI Vol 23, No 3 (2021): VOLUME 23, NOMOR 3, JULI 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.3.1-8

Bencana alam utama yang dihadapi Kota Semarang adalah banjir dengan genangan yang cukup lama. Salah satu upaya mencegah dan mengurangi dampak dari bencana banjir yaitu dengan menggunakan pompa di daerah titik â€“ titik rawan banjir di Kota Semarang. Pompa mengubah energi mekanik dari suatu penggerak menjadi energi potensial berupa head, sehingga fluida cair tersebut berpindah dan memiliki tekanan sesuai dengan head yang dimilikinya. Diperlukan juga maintenance yang tepat untuk memaksimalkan peforma dari Centrifugal Pump. Dengan tujuan memaksialkan peforma, diperlukan sistem perawatan yang tepat untuk meminimalisirkan downtime. Weibull adalah metode yang tepat untuk menentukan yang termasuk bagian kritis dan bagian tidak kritis dan sering digunakan dalam menentukan tingkat kegagalan atau kerusakan dari pola data yang terbentuk. Hasil yang diperoleh dari pengujian dengan menggunakan metode ini terdapat 3 komponen kritis yang sama yaitu pada mechanical seal, bearing, shaft. Nilai MTTF dari mechanical seal, bearing, shaft adalah 194.18 jam, 194.37 jam, 194.24 jam. Nilai keandalan mechanical seal 1, bearing 1, shaft 1 adalah 50%, 47%, dan 47%. Periodic Maintenance yang diperoleh berdasarkan hour meter (HM) dari tiap pompa.Kata kunci: Centrifugal Pump, Komponen Kritis, Weibull, Lifetime Prediction, Reliability.

Asesmen Kondisi Tube Boiler Final Superhater SA 213 91 Kapasitas 315 MW Akibat Efek Kebocoran Kondenser Harianto, Harianto; Nugraha, Ariyana Dwiputra; Suprihanto, Agus; Sulardjaka, Sulardjaka
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.30-36

Penelitian dilakukan pada pembangkit listrik tenaga uap (PLTU) Rembang Semarang Unit 2, Indonesia kapasitas 315 MW. PLTU ini mulai beroperasi pada tahun 2011 dan sudah berjalan hingga saat ini kira-kira 13 tahun atau di atas 100.000 jam EOH (equievalent operating hours). Pada awal tahun 2022 PLTU ini mengalami kebocoran kondenser sehinga perlu dilakukan asesmen pada material tube boiler. Pada studi ini akan dilakukan asesmen yaitu tube final superheater jenis SA 213 T91. Penelitian ini dilakukan untuk menjawab kecurigaan adanya indikasi degradasi atau kegagalan pada material tube akibat efek kebocoran kondenser. Analisis yang digunakan adalah dengan melakukan asesmen tube as received yaitu meliputi pemeriksaan visual, uji komposisi kimia tube, pengukuran ketebalan, pengukuran kekerasan, uji metalografi, dan analisis kandungan kimia scale pada inner tube.Dari hasil hasil pengujian dan dilakukan analisis bahwa material tube secara pengamatan visual masih dalam kondisi relatif baik tetapi pada inner tube (steam side) dan outer tube (fire side) telah mengalami korosi dan terdapat scale. Hasl uji kompoisi kimia tube sesuai dengan desainya yaitu SA 213 T91. Pengukuran ketebalan tube yaitu 6.04 mm s.d. 8.60 mm. Nilai kekerasan masih dalam batas yang diizinkan yaitu 200.08 HV s.d. 224.11 HV. Hasil pemeriksaan struktur mikro berupa martensit temper yang telah mengalami sperodisasi akibat overheating dan jika dilakukan pendekatan stadium kerusakan creep cracks (cavities) berdasarkan ERA teknologi masih masuk kategori 2 (dua) yaitu kerusakan berada pada 33% dan memiliki sisa umur yaitu 66%. Hasil ketebalan scale pada pada outer tube terukur 216.00 µm dan inner scale 232.32 µm. Hasil pengujian SEM EDX menunjukkan bahwa kandungan scale yang ada pada inner tube yaitu carbon, oxygen dan ferrous (unsur pembentuk oxide scale). Adapun unsur lainnya seperti natrium (sodium), magnesium aluminium, dan unsur lainnya berasal dari kontaminasi air pengisi boiler (feed water) akibat efek kebocoran kondenser.

Development of Footprint Analysis Software Using the Cavanagh Arch Index Method Based on a MATLAB GUI Umardani, Yusuf; Wibowo, Dwi Basuki; Suprihanto, Agus; Basyith, Mohammad Rizqi Abdul
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.13-26

The human foot plays a crucial role in supporting body weight and maintaining mobility. It is divided into three main sections: the heel, the arch (middle section), and the forefoot. Based on arch structure, feet are categorized into three types: normal, flat foot, and high arch. Flat feet can negatively affect foot health, making the identification of foot types critical for preventive care. In Indonesia, identification often relies on the wet foot test, which has limitations in accuracy. Therefore, a more effective identification system is needed. Previous studies developed software to identify foot types through digital images, but these lacked advanced features and image quality options. This research aims to develop new software that can operate a scanner, process images directly, and offer flexible editing options for improved image quality. The software was developed using MATLAB r2021B GUI, employing image acquisition and processing toolboxes. The results demonstrate high accuracy, with processing differences of 0.73% for length, 1.22% for width, 1.06% for shoe size, 1.34% for FAC, and 2.49% for the arch index compared to previous software versions.

Co-Authors . Widayat Achmad Widodo Adriathma, Abduh Bayu Ako, Henry Al Azis, Bimasakti Sulthan Anak Agung Gede Sugianthara Andhika Krismaintya Putera Andika Pradifan Andrew Bryano Kermite, Andrew Bryano Andri Cahyo Kumoro Basyith, Mohammad Rizqi Abdul Berlin, Rilo Budi Setyana Butarbutar, Martin Canggih Nugroho Catur Pramono Dianto, Wahyu Djoeli Satrijo Djoeli Satrijo Dwi Basuki Wibowo Dwi Basuki Wibowo Eko Surojo Eko Surojo Faisal Yusuf Tornado Gunawan Dwi Haryadi Hadiyanto Hadiyanto Hanif, Dimas Naufal Hanifa, Kana Harianto Harianto Henri Fatih Wibowo Ian Yulianti IGN Wiratmaja Puja Indrawan, Harry Ismoyo Haryanto Jericho Jericho Kamta Kamta Khoiri Rozi Khoiri Rozi Miftachul Munir Mika Patayang, Mika Muhammad Fajar Purnama Muhammad Fakhri Aji Pratomo Nugraha, Ariyana Dwiputra Nur Aziyah Nur Cahyo Ojo Kurdi P Wahyudi Parven, Parven Paryanto, P Pratomo, Muhammad Fakhri Aji Purbonugroho, Hanindhieto Dias Andra R Rizal Isnanto Reza, Reza Rochim Suratman Rusman Rusman Setyawan Bekti Wibowo Sianipar, Daniel Sigit Iswahyudi Siti Aisyah Soesanto, Indra Harfani Sukamta Sukamta Sulardjaka Sulardjaka Sulardjaka, S Sumardi . Susilo Adi Widyanto Sutopo, Farrel Rico Alifta Suyitno Suyitno Teguh Triyono Tomy Satya Wahyudianto, FX. Arif Waruwu, Kezia Gracelynn Wijaya, Elang Pramudya Yatim, Ardiyansyah Saad Yurianto Yurianto Yusuf Umardani Yusuf Umardhani

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