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Atmoko, Nugroho Tri
Sekolah Tinggi Teknologi Warga Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Optimasi Media Pendingin untuk Meningkatkan Kekerasan Permukaan Baja Karbon Rendah melalui Proses Carburizing Pisti Cikarge, Ghia; Atmoko, Nugroho; Alfarizie, Tito; Wijayanto, Hendi; Suseno, Ibnu
Teknika STTKD: : Jurnal Teknik, Elektronik, Engine Vol 11 No 1 (2025): TEKNIKA STTKD: JURNAL TEKNIK, ELEKTRONIK, ENGINE
Publisher : Sekolah Tinggi Teknologi Kedirgantaraan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56521/teknika.v11i1.1502

Abstract

Carburizing is one of the most effective heat treatment methods to enhance the surface hardness of low-carbon steel by diffusing carbon atoms into the material's surface layer. The final characteristics of the carburized layer are strongly influenced by the quenching medium applied after the heating process. This study aims to analyze the effect of various quenching media on the microstructure and hardness of low-carbon steel specimens subjected to pack carburizing. The quenching media used include air, distilled water, and oil. Vickers hardness testing was conducted across the cross-section of the specimens, and microstructural characterization was performed using optical microscopy. The results show that air cooling produced a ferrite–pearlite structure with a diffusion layer thickness of approximately 188 µm and a hardness of 384 HV. Quenching with distilled water and oil resulted in a mixed structure of fine pearlite and partial martensite with hardness ranging from 780 to 820 HV. These findings indicate that oil is a promising alternative quenching medium for enhancing surface hardness without reducing the toughness of the core material.
Desain dan Rekayasa Alat Pengkristal Gula Semut menggunakan Piringan Crusher Atmoko, Nugroho Tri; Riyadi, Tri Widodo Besar
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2024: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Penelitian ini bertujuan untuk mendesain dan merekayasa alat pengkristal gula semut dengan menggunakan piringan penghancur (crusher), dan mengetahui pengaruh putaran crusher terhadap diameter serbuk gula. Putaran piringan penghancur dibuat rendah dengan pertimbangan untuk menjaga agar tidak merusak kualitas mutu gula terutama dari sisi warna, aroma dan rasa. Proses desain alat pengkristal gula semut menggunakan software solidworks 2014, sedangkan perhitungan element hanya mencakup poros pulley yang terdapat pada system transmisi alat tersebut. Pengoperasian dan pengujian alat menggunakan 4 variasi putaran piringan crusher, yakni 70 rpm, 80 rpm, 90 rpm dan 100 rpm. Pengujian foto mikro pada bulir gula semut dilakukan untuk mendiskripsikan ukuran diameter bulir gula semut sesuai dengan besarnya putaran yang divariasikan pada piringan crusher. Hasil rekayasa alat pengkristal gula menunjukkan bahwa mekanisme system transmisi perpaduan antara V-Belt dan Gearbox dapat menghasilkan putaran piringan crusher menjadi 70-100 rpm sehingga mutu gula berhasil tetap terjaga. Perhitungan kapasitas produksi gula semut sebelum dan setelah penggunaan alat pengkristal menunjukkan kenaikan yang cukup signifikan yakni sebesar 350%. Hasil pengujian foto mikro terhadap diameter bulir gula menunjukkan bahwa putaran piringan crusher 70, 80, 90 dan 100 rpm menghasilkan spesifikasi ukuran bulir gula dengan ukuran 2200 µm, 1551 µm, 1222 µm dan 854 µm. Berdasarkan hasil kajian permintaan pasar maka putaran 100 rpm yang paling sesuai untuk menghasilkan gula dengan ukuran diameter bulir gula 854 µm. Dengan demikian maka pengaplikasian alat ini dapat meningkatkan kapasitas produksi gula semut serta untuk mengetahui pada putaran piringan crusher berapa menghasilkan ukuran diameter bulir gula semut yang sesuai dengan permintaan pasar.sesuai dengan permintaan pasar.
Design Optimisation of Outer Hood Panel of Esemka R2 Car to Improve Pedestrian Protection Atmoko, Nugroho Tri; Riyadi, Tri Widodo Besar
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2024: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Traffic accidents are terrible scourge that occur in many countries, specially for developing countries where transportation affairs like tangled yarn. Besides functioning as an engine compartment cover, the hood of modern compact SUV can also help to manage the impact energy of a pedestrian's head in a vehicle-pedestrian impact. This paper presents outer hood design of Esemka R2 that has a potential to improve hood's ability and also to absorb the impact energy of a pedestrian's head. The developed method for the design of an outer hood configuration aims to provide a robust design and homogeneous of Head Injury Criterion (HIC) for impact position at WAD 1000 and three different thicknesses (1.25 mm, 1.35 mm & 1.50 mm) of outer hood panel of Esemka R2 compact SUV, taking into consideration the limited space available for deformation. The non-linear Finite Element Analysis (FEA) software (Explicit Dynamics) was used in this research to simulate the testing procedurs of head impact for child pedestrian. The results show that the average of comparison dimensional of outer hood panel of Esemka R2 was 4.89 mm. The minimum of deformation space meet the requirement for HIC value which required obtaining robust and homogeneous head impact performance. Outer hood thickness and materials were identified as the factors to influence the stress and HIC value of the hood. By comparing all outer hood panels, aluminium alloy as the best selected material which has the lowest value is 32.78% for the pedestrian protection.
Sosialisasi Pengolahan Limbah Organik Rumah Tangga Melalui Budidaya Magot di Desa Pandeyan, Kecamatan Grogol, Kabupaten Sukoharjo Tri Atmoko, Nugroho; Suryono, Edy; Besar Riyadi, Tri Widodo; Teofilus Riyadi, Natanael; Awan, Sang Alang; Wicaksono, Bagas; Yuniarta, Fajar; Bagus Nugroho, Taufik; Putra Tegar Permata, Septian
Jurnal Suara Pengabdian 45 Vol. 2 No. 3 (2023): September: Jurnal Suara Pengabdian 45
Publisher : LPPM Universitas 17 Agustus 1945 Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/pengabdian45.v2i3.1059

Abstract

Organic waste is an environmental problem, especially in the villages of Pandeyan, Grogol, Sukoharjo, so there is a need to solve this problem through direct community activities. One solution is the socialization activity on organic waste processing through magot cultivation in Pandeyan village. With this socialization, it is hoped that the community will gain further understanding regarding magot cultivation as an effort to process household organic waste to make it more useful. The socialization activity was conducted at the Pandeyan village office on August 30, 2023. To measure the success of socializing organic waste processing through magot cultivation, an evaluation was carried out using a questionnaire method distributed to participants. From the questionnaire results, it was found that 88.9% of the total participants understood magot cultivation. Meanwhile, if you look at the potential of organic waste in each household participating in this socialization, it is possible to process it through magot cultivation. However, there is still a need for assistance and further understanding regarding magot cultivation because there is still a stigma that maggots have a maggot-like shape and are not suitable for cultivation.
Optimasi Kinerja Thermoelectric Generator (TEG) melalui Analisis Distribusi Kalor dan luaran Listrik dengan Variasi Sirip Penukar Panas Atmoko, Nugroho Tri; Jamaldi, Agus; Ulikaryani, Ulikaryani; Pisti Cikarge, Ghia
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30546

Abstract

The utilization of waste heat from conventional gas stoves as electrical energy represents an effort to improve household energy efficiency. Thermoelectric generator (TEG) technology enables the direct conversion of thermal energy into electrical energy without moving components. This study aims to investigate the performance of TEGs in harnessing waste heat from gas stoves through the application of various heat-sink fin configurations to enhance thermal absorption. Three types of fins—long fins, short fins, and random fins—were employed as heat exchangers and mounted on a modified stove enclosure. Four TEG modules were connected in series and tested to measure operating temperatures and the resulting electrical output. The findings indicate that fin configuration significantly influences heat distribution and TEG performance. The random fin model demonstrated the highest heat absorption capability, reaching 94.112 J/s, thereby increasing the temperature gradient across the TEG modules. Consequently, the random fin model also produced the highest electrical output, generating 3.369 Watts, outperforming the other fin designs. These results highlight the critical role of fin geometry in optimizing heat transfer within TEG systems. In conclusion, the random fin configuration is the most effective heat exchanger design for TEG applications on gas stoves, as it enhances heat absorption efficiency and delivers greater electrical power output. This finding offers important potential for further development of self-sustaining energy systems in household appliances.
Development of Fiber Optic Sensor-Based Weight-In-Motion System For Bridge Applications Fatimah Nur Hidayah; Nugroho Tri Atmoko
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 1 (2024): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i1.79525

Abstract

Vehicles loaded with Over Dimension Overload (ODOL) cause damage to road infrastructure, traffic accidents, and endanger crossing transportation. ODOL vehicles also contribute to the death of people. This research focuses on characterizing the effect of moving loads on fiber optic light loss. Problem-solving approach through the optical fiber macrobending method. This research aims to be implemented in the WIM system concept. Macrobending comes from the weights contained in the body dump. The types of loading carried out are static and dynamic. Under dynamic loading, the speed variation is 0.1 m/s, 0.2m/s, and 0.3 m/s. The research results show that the greater the loading value, the greater the attenuation value of the optical fiber. This research applies to all three speed variations of the dummy dump truck, both front and rear wheels. Apart from that, the best sensitivity value is found at a speed variation of 0.1 m/s. The value is 2.029. This data can be used as a reference for the most recommended speed when a loaded vehicle passes through a fiber optic sensor-based WIM system.
Co-Authors Agung Supriyanto, Agung Agus Jamaldi Alfarizi, Tito Alfarizie, Tito Amarulloh Amarulloh Amiruddin Amiruddin Arif Hidayat Purwono Awan, Sang Alang Bagas Wicaksono Bagas Wicaksono, Bagas Bagus Nugroho, Taufik Bagus Radiant Utomo Bagus Radiant Utomo Bambang Hari Priyambodo Bambang Margono Burhanudin Burhanudin Chamim, Moch. David Setiadhi Denis Marchant Elkana Bilak Lopo Emanuel Budi Raharjo Fahlovi, Oldy Fajar Yuniarta Fariyono Fariyono Fatimah Nur Hidayah Ganjar Kurnia Haikal Hendi Lilih Wijayanto Hendra Setyawan Jamaldi, Agus Kadex Widhy Wirakusuma Kadriadi Kadriadi Karminto Karminto Margono Margono Margono Margono Martinus Heru Palmiyanto Natanael Teofilus Riyadi Pisti Cikarge, Ghia Priyanto, Kaleb Putra Tegar Permata, Septian Radik Syamsul Erfan Rizqi Ilmal Yaqin Sang Alang Awan Septian Putra Tegar Permata Subiyati Subiyati Suhartoyo Suhartoyo Suhartoyo Suhartoyo, Suhartoyo Suryono, Edy Suseno, Ibnu Taufik Bagus Nugroho Teofilus Riyadi, Natanael Tri Widodo Besar Riyadi Ulikaryani, Ulikaryani Wahyu Purno Satrio Wijayanto, Hendi Xiaomeng Zhu Yanti Pasmawati Yuniarta, Fajar